<figure><img src="https://superdesk-pro-c.s3.amazonaws.com/sd-nepalitimes/2022111412118/6372226e9c7e80680e0c02f6jpeg.jpg" alt="" width="1776" height="1000"/><figcaption>Soot and dust particles from pollution that settle on the Khumbu Glacier makes it melt faster. Photo: EELUM DIXIT.</figcaption></figure>Fine suspended particles in the air have reached harmful levels, and are reducing the average lifespan of people in urban Nepal by at least two years. Now, scientists have found that pollution is also causing Himalayan glaciers to melt faster than earlier thought.The role of <a href="https://www.nepalitimes.com/banner/things-are-up-in-the-air-in-nepal/" target="_blank" rel="noopener noreferrer">dust particles</a> is said to be an important driver in reducing the reflectivity of snow and ice, so that they absorb more sunlight and melt faster. And there is more dust blowing into the mountains because of desertification, changing agricultural practices, intense storms, and dust being blown off mountain slopes that have lost snow cover.‘Because a majority of (Himalayan) snowmelt is generated from seasonal snowpack below 5,000m, dust deposition via elevated aerosol levels can cause a large snow surface albedo reduction and influence snowmelt,’ notes a new study in the science journal Nature. ‘Moreover, the influence of dust on snow darkening is greater than that of black carbon above 4,000m.’<figure><img src="https://superdesk-pro-c.s3.amazonaws.com/sd-nepalitimes/2022111412118/637222719c7e80680e0c02f7jpeg.jpg" alt="" width="1500" height="1000"><figcaption> </figcaption></figure>Greenhouse gas buildup in the atmosphere is set to raise global average temperatures by at least 2°C above pre-industrial levels by 2050, and this is still the main reason Nepal’s glaciers are receding and shrinking. But controlling soot particles and reducing dust in the air could slow the process.The Nature study found that black carbon particles have a larger snow albedo darkening effect than dust because it is darker. But dust contributes more to melting because there is up to 1,000 times more of it than soot.“Temperatures are increasing faster in the Himalaya, this makes weather conditions more unstable prompting long distance transport of dust and other particles more likely,” explains climate scientist Binod Pokharel. The new study now confirms that the role of dust deposit in melting Himalayan ice is greater than previously thought.Now that the <a href="https://www.nepalitimes.com/latest/post-disaster-lessons-for-nepal/" target="_blank" rel="noopener noreferrer">monsoon is here</a>, people in Kathmandu Valley find it easier to breathe since the air quality index (AQI) is better. But vehicular emissions and brick kiln smoke keep the concentration of suspended soot particles in the air at unhealthy levels.Dirtier air increases the incidence of chronic obstructive pulmonary disease (COPD), lung cancer, bronchitis, stroke, mental retardation and congenital heart defects. Particles less than 2.5 microns are especially dangerous because they can cross the air-blood barrier in the lung capillaries.Previous studies on Langtang Glacier showed that while global warming was still the main cause of melting, up to 20% of the defrosting was due to snow darkening because of soot deposition.<figure><img src="https://superdesk-pro-c.s3.amazonaws.com/sd-nepalitimes/2022111412118/637222749c7e80680e0c02f8jpeg.jpg" alt="" width="644" height="376"><figcaption> </figcaption></figure>The <a href="https://www.nepalitimes.com/banner/it-is-getting-hotter-on-the-roof-of-the-world/" target="_blank" rel="noopener noreferrer">Himalaya is already warming</a> up to 0.7°C faster than the global average, and these suspended particles are increasing the rate of melting. What is new in the research is that dust particles are more responsible than black carbon from pollution simply because there is more of it.Black carbon in soot from diesel exhaust, thermal power plants, brick kilns and wildfires are transported by wind to glaciers and snowfields, darkening them and making them absorb more sunlight.Now, <a href="https://www.nepalitimes.com/banner/climate-change-is-a-disaster-in-the-nepal-himalaya/" target="_blank" rel="noopener noreferrer">climate change</a> is triggering more intense sand and dust storms and prevailing winds during the pre-monsoon and carrying them over long distances to deposit them in the high Himalaya.But it is not only the origin of dust but the concentration and composition of the pollutant that makes a difference on how it adds to the climate crisis, says meteorologist Namindra Dahal.For example, suspended particles over cities in India and China have greater inorganic fossil fuel components, while dust being blown in from the Arabian desert have more mineral content. Prevailing winds are from the west for nine months in a year, and blow in sand and soot from West Asia and India to Nepal.Studies have shown that water in Nepal’s lakes and rivers at higher elevations already have greater concentrations of dust and carbon particles.<figure><img src="https://superdesk-pro-c.s3.amazonaws.com/sd-nepalitimes/2022111412118/637222769c7e80680e0c02f9jpeg.jpg" alt="" width="644" height="412"><figcaption> </figcaption></figure>“In the past, the air was clean but its composition has changed over the years and that has become a matter of concern due to suspended particles it constitutes, including dust,” explains Dahal. “And all this <a href="https://www.nepalitimes.com/latest/nepal-doubles-its-carbon-footprint/" target="_blank" rel="noopener noreferrer">pollution</a> ultimately ends up in the Himalaya, making it melt even faster.”At the current rate of melting, and if nothing is done to reduce greenhouse gas emissions, two-thirds of Himalayan ice will be gone by the turn of the century, studies have forecast.This week, Nepal’s delegation at the UN Climate Conference in Bonn once again urged the developed world to address loss and damage caused by the climate crisis, help the country adapt to extreme weather and prevent <a href="https://www.nepalitimes.com/banner/danger-nepals-glacial-lakes-are-filling-up/" target="_blank" rel="noopener noreferrer">glacial lake outburst floods</a>.<figure><img src="https://superdesk-pro-c.s3.amazonaws.com/sd-nepalitimes/2022111412118/637222789c7e80680e0c02fajpeg.jpg" alt="" width="1500" height="1000"><figcaption> </figcaption></figure>However, Nepal must also show a commitment to reducing the increased amount of suspended soot and dust in the air — not just to slow melting of the mountains but also to lessen public health risk. <a href="https://www.nepalitimes.com/here-now/air-pollution-is-more-dangerous-than-smoking/" target="_blank" rel="noopener noreferrer">Respiratory problems</a> caused by air pollution alone killed nearly 45,000 people in Nepal in 2019.Switching to electric public transport and battery-powered two-wheelers would not just clean up the air, but also use surplus hydropower and reduce Nepal’s petroleum import bill.While much of air pollution is indeed <a href="https://www.nepalitimes.com/here-now/how-transboundary-haze-affects-nepal/" target="_blank" rel="noopener noreferrer">transboundary in nature</a>, but increasingly it is local emissions that worsen the impact on public health and make glaciers melt faster.Says Namindra Dahal: “Just look at our roads, the dust is killing people and it is killing the mountains. Unless we do our part we have no moral right to demand compensation on the global stage.”

Sonia Awale

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Dirty snow defrosts Nepal’s mountains

<figure><img src="https://superdesk-pro-c.s3.amazonaws.com/sd-nepalitimes/20221114091156/637202fc9c7e80680e0b27e3jpeg.jpg" alt="" width="2048" height="1366"/><figcaption>Vehicles are one of the biggest emitters of PM2.5 and other pollutants in Kathmandu. Photos: AMIT MACHAMASI</figcaption></figure>It is that time of the year again when smog makes <a href="https://www.nepalitimes.com/here-now/air-pollution-is-more-dangerous-than-smoking/" target="_blank" rel="noopener noreferrer">Kathmandu’s air hazardous to health</a>. Hospitals are swamped not with Covid, but COPD (Chronic Obstructive Pulmonary Disease).Once more, there is a flurry of media headlines about the dangerous concentration of suspended particles smaller than 2.5 microns from diesel exhaust.Read also: <a href="https://www.nepalitimes.com/banner/happy-new-air/" target="_blank" rel="noopener noreferrer">Happy New Air</a>, Sonia AwalePublic awareness about air pollution is at an all-time high, the average life expectancy of Kathmandu’s residents is reduced by at least four years. Yet, nothing happens. Why?“The awareness and knowledge have not translated into corrective action,” explains environmentalist Bhushan Tuladhar. “We know about vehicle emission tests but we ignore it, open burning is bad but we don’t stop, we have the opportunity to reduce air pollution with electric mass transport but we don’t invest in it.”<figure><img src="https://superdesk-pro-c.s3.amazonaws.com/sd-nepalitimes/20221114091156/637203009c7e80680e0b27e4jpeg.jpg" alt="" width="1500" height="1000"><figcaption> </figcaption></figure>Air pollution was directly linked to at least 42,100 deaths in Nepal in 2019. Almost half of that was due to breathing in particles smaller than 2.5 microns in diameter which can cross the air blood barrier in the lung capillaries. Most of those particles come from <a href="https://www.nepalitimes.com/here-now/green-sticker-green-light-to-pollute/" target="_blank" rel="noopener noreferrer">vehicle emission</a>.From 1990 to 2015, the number of vehicless in Nepal grew by 1,995,404 — most of them in Kathmandu Valley. In five years, that figure doubled to 3,987,267.This figure doesn’t include the exploding demand for cars and motorcycles after the end of the Covid second wave in mid-2021. Nepal spent Rs543 billion in importing vehicles, transport equipment and spare parts in four months from mid-July to mid-October, against Rs357 billion and Rs418 billion for the same periods in 2020 and 2019.“There has been an unexpectedly high demand for private vehicles in Nepal after the pandemic, especially two wheelers given the public’s hesitancy to use buses due to coronavirus fears,” says Dhruba Thapa of the National Automotive Dealers Association.<iframe style="border: none;" title="Total vehicles in Nepal" src="https://e.infogram.com/e0cdbfd0-0b3c-4f57-851e-7aced6e69116?src=embed" width="700" height="700" frameborder="0" scrolling="no" allowfullscreen="allowfullscreen"></iframe><a style="color: #989898!important; text-decoration: none!important;" href="https://infogram.com/e0cdbfd0-0b3c-4f57-851e-7aced6e69116" target="_blank" rel="noopener noreferrer">Total vehicles in Nepal</a><a style="color: #989898!important; text-decoration: none!important;" href="https://infogram.com" target="_blank" rel="nofollow noopener noreferrer">Infogram</a>Raju Chettri, CEO of the MAW Enterprises that imports Yamaha bikes in Nepal has a similar observation. He saw a decline in the annual sales of two wheelers from about 250,000 units to 190,000 right after the pandemic. But this year, the sales went up to 350,000 units.“There are two reasons behind this: pent-up demand and reduced use of public transport because of Covid fears,” Chettri says.There are <a href="https://www.nepalitimes.com/banner/poisoning-the-air-we-breathe/" target="_blank" rel="noopener noreferrer">more than 3.1 million two-wheeers in Nepal</a>, over one million of them in Kathmandu. They are adding to the capital’s foul air, as they are up to 10 times more polluting per passenger kilometre than buses and cars.<iframe style="border: none;" title="Total Motorbikes in Nepal" src="https://e.infogram.com/ea449cd7-2598-4cd4-8ae2-cd91858f9553?src=embed" width="700" height="700" frameborder="0" scrolling="no" allowfullscreen="allowfullscreen"></iframe><a style="color: #989898!important; text-decoration: none!important;" href="https://infogram.com/ea449cd7-2598-4cd4-8ae2-cd91858f9553" target="_blank" rel="noopener noreferrer">Total Motorbikes in Nepal</a><a style="color: #989898!important; text-decoration: none!important;" href="https://infogram.com" target="_blank" rel="nofollow noopener noreferrer">Infogram</a>Two-wheelers also emit invisible toxic gases like carbon monoxide, benzene and nitrous oxides, and increase the concentration of street-level ozone. Motorcycle exhaust may not be as visible as diesel exhaust, but they are highly poisonous — especially when there are so many of them. Besides exacerbating respiratory diseases, the gases are carcinogenic, causing cardiovascular diseases and Alzheimer’s.The solution is to shift rapidly to <a href="https://www.nepalitimes.com/banner/nepals-electric-transport-future-is-here/" target="_blank" rel="noopener noreferrer">cleaner electric vehicles</a>, not just for healthier air but also to meet Nepal’s net-zero pledge in Glasgow and to reduce the country’s burgeoning petroleum import bill.“The priority has to be on electric public transport and supporting infrastructure,” says environmentalist Tuladhar. “Electric buses are more expensive than diesel ones, so the government has to help with capital, and better manage Kathmandu’s public transport.”<figure><img src="https://superdesk-pro-c.s3.amazonaws.com/sd-nepalitimes/20221114091156/637203039c7e80680e0b27e5jpeg.jpg" alt="" width="720" height="480"><figcaption> </figcaption></figure>This week, Nepal opened its first electric charging station powered by solar panels for the Lumbini Development Trust. Similar charging stations can be set up for public and private vehicles in existing bus parks across Nepal and along highways. Sajha Yatayat which is procuring 40 electric buses is also trying to turn the former trolley bus terminal into a charging station.Shilshila Acharya of the Avni Center for Sustainability agrees that the priority should be on <a href="https://www.nepalitimes.com/banner/from-a-fossil-past-to-an-electric-future/" target="_blank" rel="noopener noreferrer">electrifying public transport</a> and encouraging bicycle lanes. She says, “Replacing cars with more cars even if electric only promotes consumerism. We have to give people reliable alternatives.”Kathmandu Valley Air Quality Management Action Plan held its first implementation committee meeting this week, during which it discussed lunching of a USAID-funded project for air pollution and a forecasting system with technical support from ICIMOD.“The problem of air pollution will take some time to be solved but we have started our homework,” says Indu Joshi of the Department of Environment. “At the moment, our biggest challenge is controlling open burning.”<figure><img src="https://superdesk-pro-c.s3.amazonaws.com/sd-nepalitimes/20221114091156/637203069c7e80680e0b27e6jpeg.jpg" alt="" width="2000" height="2625"><figcaption> </figcaption></figure>Apart from transport, garbage burning and biomass fuel for household heating and cooking are also contributors to Kathmandu’s dirty air. The problem is made worse in winter due to the <a href="https://www.nepalitimes.com/banner/how-weather-elevates-air-pollution-in-kathmandu/" target="_blank" rel="noopener noreferrer">Valley’s topography that traps surface pollution</a> in an inversion layer.Improper <a href="https://archive.nepalitimes.com/article/nation/a-load-of-rubbish-kathmandus-garbage-problem,4039" target="_blank" rel="noopener noreferrer">solid waste management in Kathmandu</a> means locals burn garbage by the riverbanks near residential areas — while, as studies show, segregation of waste at homes can reduce the city’s garbage volume by up to 80%.There is no other problem that is so directly linked with the health and economy of the country as urban air pollution. The <a href="https://www.nepalitimes.com/banner/nepal-lockdown-proves-air-quality-can-be-improved/" target="_blank" rel="noopener noreferrer">Covid-19 lockdown in 2020</a> is proof that Kathmandu can be cleaned up, it just needs <a href="https://www.nepalitimes.com/banner/dirty-politics-dirty-air/" target="_blank" rel="noopener noreferrer">the right leadership and the political will</a> to back it up.Says Shilashila Acharya: “Our policies on mobility and air pollution have to be people- and culture-centric, instead of focusing only on technology. We must build public pressure to force the politicians into action.”A public opinion poll in this paper just before the 2017 elections showed that a majority of Nepalis were concerned about the health impact of pollution. Since 2022 will be dominated by campaigning for the next election, this could be turned into the main criteria for candidates to win votes.

Breathing can kill you

<figure><img src="https://superdesk-pro-c.s3.amazonaws.com/sd-nepalitimes/20221110111156/636cd9219c7e80680e092e81jpeg.jpg" alt="" width="1500" height="1000"/><figcaption>Haze shrouds Bhaktapur on Monday afternoon as smoke from fires in Chitwan engulfed Kathmandu Valley and Central Nepal. Photo: AMIT MACHAMASI</figcaption></figure>Kathmandu Valley and Central Nepal was engulfed in thick haze on Monday afternoon as prevailing winds whipped up fires in Chitwan and Parsa National Parks.Infrared satellite images from NASA’s <a href="https://firms.modaps.eosdis.nasa.gov/" target="_blank" rel="noopener noreferrer" data-saferedirecturl="https://www.google.com/url?q=https://firms.modaps.eosdis.nasa.gov&amp;source=gmail&amp;ust=1616508970355000&amp;usg=AFQjCNErMmof792DiNvE9DRev-Wskc40QQ">FIRMS (Fire Information for Resource Management System)</a> showed many fires raging at the eastern edge of Chitwan and across Parsa, in the vicinity of Hetauda, as well as in Bardia, Surkhet and other districts in the mid-mountains of western Nepal.<figure><img src="https://superdesk-pro-c.s3.amazonaws.com/sd-nepalitimes/20221110111156/636cd9249c7e80680e092e82jpeg.jpg" alt="" width="1000" height="539"><figcaption>Forest fires in Chitwan and Parsa National Parks southwest of Kathmandu in this infrared image from NASA’s FIRMS satellite taken on Monday. Image: FIRMS/NASA</figcaption></figure>Another satellite image in the visible spectrum from <a href="http://www.apple.com/uk" target="_blank" rel="noopener noreferrer" data-saferedirecturl="https://www.google.com/url?q=http://www.apple.com/uk&amp;source=gmail&amp;ust=1616508970355000&amp;usg=AFQjCNEbOVQv7FTp2t429z67KNcTUW51Iw">NASA Worldview </a>showed blue smoke shrouding Himalayan valleys of Central Nepal.<figure><img src="https://superdesk-pro-c.s3.amazonaws.com/sd-nepalitimes/20221110111156/636cd9279c7e80680e092e83jpeg.jpg" alt="" width="1000" height="689"><figcaption>Image in the visual spectrum taken by NASA’s Worldview satellite on Monday at 2pm local time. Image: NASA Worldview</figcaption></figure><figure><img src="https://superdesk-pro-c.s3.amazonaws.com/sd-nepalitimes/20221110111156/636cd9299c7e80680e092e84jpeg.jpg" alt="" width="300" height="401"><figcaption>Air Quality Index measured in Patan in Kathmandu Valley at 4pm on Monday showed a hazardous reading of 421, which is more than ten times higher than the WHO's safe threshold. Photo: KUNDA DIXIT</figcaption></figure>The national parks allow buffer zone villagers to enter the protected areas once a year in spring to collect deadwood and thatch grass. Villagers sometimes set fire to the grasslands, and prevailing winds spread these blazes.Deficient winter rain this year has made the forests in the Nepal Tarai drier than usual, which has led to the fires this year more extensive.Kathmandu Valley recorded an Air Quality Index (AQI) reading of 421 at 4pm on Sunday, which is more than 10 times higher than the threshold set by the World Health Organisation for air safe for breathing.In addition to the smoke, there was also pollution from traffic emissions, cross-border industrial smog from India, as well as wind-blown sand from the Arabian desert that has been covering the Subcontinent for the past week.

Central Nepal engulfed in smoke

<figure><img src="https://superdesk-pro-c.s3.amazonaws.com/sd-nepalitimes/20221110111132/636cd3939c7e80680e08f975jpeg.jpg" alt="" width="2076" height="1210"/><figcaption>A NASA satellite image showing Central Nepal's river valleys and how they act as funnels for pollution from the Indian plains to travel up to the mountains.</figcaption></figure>The Himalayan mountains act as a barrier separating the clean air of the Tibetan Plateau from the polluted Indo-Gangetic plains. But Nepal’s rivers cut through the mountains, and their valleys allow smog from the plains to penetrate deep into the mountains.This haze intrusion goes up to elevations of 4,000m, and the pollution layer is more shallow and flat in winter, and inclined and parallel to the ridgeline in the pre-monsoon. The depth of this pollution layer up the valleys also decreases with elevation.<figure><img src="https://superdesk-pro-c.s3.amazonaws.com/sd-nepalitimes/20221110111132/636cd3969c7e80680e08f976jpeg.jpg" alt="" width="780" height="325"><figcaption> </figcaption></figure>These visible air pollution images are captured regularly by the <a href="https://modis.gsfc.nasa.gov/about/">MODIS</a> (Moderate Resolution Imaging Spectroradiometer) instrument aboard the two NASA satellites Terra and Aqua orbiting the Earth. The dull bluish haze is mostly made up of fine aerosol particles and extends right across the Indo-Gangetic plains from Pakistan to Bangladesh, as well as the Tarai in Nepal.While human-generated emissions from agricultural burning, urban, rural and industrial emissions are mainly responsible for this region-wide pollution, weather conditions and the blocking effect of the Siwalik Range also affect its spread. More interestingly, if we zoom in on the images, we can see that the haze does not just stay in the plains, but flows up into the inner Himalaya along river valleys.<figure><img src="https://superdesk-pro-c.s3.amazonaws.com/sd-nepalitimes/20221110111132/636cd3989c7e80680e08f977jpeg.jpg" alt="" width="780" height="381"><figcaption> </figcaption></figure>These satellite images provide valuable insight for researchers looking into the geographical spread and long-range transport of aerosol particles. Scientists at <a href="https://duke.edu/">Duke University</a> in the United States have developed a novel technique to use the high-resolution satellite images from MODIS and elevation data from <a href="https://www2.jpl.nasa.gov/srtm/mission.htm">SRTM</a> (Shuttle Radar Topography Mission) to extract the daytime haze run-up that measure intrusion length and height over the Arun Valley in eastern Nepal.The Arun River starts in Tibet, snakes around Mt Everest to find a gap between Makalu and Kangchenjunga to tumble down Himalayan gorges to meet up with the Sun Kosi and Tamor— flowing out into the Tarai at Chhatra and then through the Kosi Barrage to meet the Ganges in India. This also opens up the entry gate for haze to flow from the Indo-Gangetic Plains into the inner Himalayas.<figure><img src="https://superdesk-pro-c.s3.amazonaws.com/sd-nepalitimes/20221110111132/636cd39a9c7e80680e08f978jpeg.jpg" alt="" width="780" height="321"><figcaption> </figcaption></figure>In winter, the surface temperature in the plains plummets, and the air is dry. The southern edge of the Tibetan Plateau at upper levels is also battered by the sub-tropical jetstream, with weak westerly wind below it. The low surface temperature in the plains confines the pollution to a shallow <a href="https://glossary.ametsoc.org/wiki/Atmospheric_boundary_layer">boundary layer</a> that is lower than the Siwalik Range. Up-valley winds along the river valleys then transport the haze into the Inner Himalaya.The river valley-plains temperature contrast produces a pressure gradient that drives this flow up the valley during the day and down the valley during the night. Besides, the topography, vegetation cover and groundwater level in the slopes can also contribute to warming of valley air which could further amplify the up-valley wind.In addition, the daytime up-slope and night-time down-slope winds developing in the river valleys also play and important role in ventilating the air pollution from the valley surface.Measurements of the nature and size of fine aerosols were conducted for the first time in the middle Himalayan region in the pre-monsoon. In general, the aerosol size distribution peaks around 100nm, which is usually the oldest, most processed background aerosol and about the size of the Covid-19 virus.Another smaller peak around 20 nm, is indicative of fresh but not necessarily local aerosols. The chemical composition of PM2.5 (particulate matter below 2.5 microns) is dominated by organic matter. Organic carbon (OC) comprises the major fraction (64–68%) of the aerosol concentration followed by ionic species (24–26%), Elemental Carbon (EC) compromises 7–10% of the total composition and 27% of OC is water soluble.Elemental Carbon and Organic Carbon together are aerosols contributed by burning of wood fuels, crop-residue, coal including vehicular emission and others. The light absorbing properties of elemental carbon play a crucial role in atmospheric warming and surface cooling due to their interaction with the daytime solar heating.Industrial and vehicular emissions, biomass burning, soil dust and others including chemical transformations in the atmosphere contribute to the ionic species in aerosols. These are readily water-soluble parts of the aerosol which along with organic particles aid in their growth in presence of moisture, contributing to increase in optical thickness of haze.The aerosol concentration also changes over the day. It increases in the morning (05:00-10:00) and in the evening (17:00-22:00). The lower values in the afternoon could be attributed partly to more mixing, and increase in the boundary layer height.During the night, the downslope winds lift the warm air mass in the valley, resulting in the decrease of the aerosol concentration near the surface. On the other hand, aerosol loading can also be eventually washed away by local rainfall during the pre-monsoon and winter.<figure><img src="https://superdesk-pro-c.s3.amazonaws.com/sd-nepalitimes/20221110111132/636cd39c9c7e80680e08f979jpeg.jpg" alt="" width="780" height="300"><figcaption> </figcaption></figure>While pollution haze is visible even in satellite images, its quantitative measurements can also be made by remote sensing. Haze and dust particles in the air block sunlight reaching the ground by absorbing and scattering it. This property of aerosols is used to estimate the Aerosol Optical Depth (AOD).A long-term average of winter AOD from December-February over the last 20 years in the region shows that winter haze extends throughout the Indo-Gangetic plains, with relatively higher readings for the eastern regions of Bihar, West Bengal and Bangladesh, across Nepal’s southeastern border. The regional average winter AOD also shows an alarming increase in the past two decades due to increase in emissions from increased crop-residue burning, rapid urbanisation, industrialisation, etc.<figure><img src="https://superdesk-pro-c.s3.amazonaws.com/sd-nepalitimes/20221110111132/636cd39e9c7e80680e08f97ajpeg.jpg" alt="" width="780" height="481"><figcaption> </figcaption></figure>Aside from transboundary haze, this winter has also seen an increase in wildfires that have exacerbated the pollution in Nepal’s Inner Himalayan valleys. The Pathivara and Annapurna Conservation Area fires in December, followed by uncontrolled wildfires in Manang, Lamjung and Rasuwa in January were clearly visible in NASA satellite images.The very high pollution levels in Kathmandu Valley on 6-7 January was also aggravated by overcast skies which subdued the ventilation mechanism of the valley, but smoke from these wildfires also acted as contributors. Since the daily satellite data is in the public domain, they could be used along with global models by Nepal’s met office to nowcast air pollution episodes over the Himalaya.While local air pollution can be brought under control in the interest of protecting public health by the local governments with appropriate policy and regulation, it is trans-boundary pollution that cannot be easily addressed. It requires regional collaboration to adopt and implement policies to reduce sources of pollution like crop residue burning, vehicular and industrial emissions. The atmospheric initiative at the Kathmandu-based International Centre for Integrated Mountain Development (ICIMOD) could be one such mechanism.More immediately, there is an urgent need to set up permanent air quality monitoring stations along Nepal’s major river valley outlets to monitor trans-boundary air pollution and more research by universities in Nepal to improve our knowledge of local and regional pollution so that policy makers can make better decisions.Prabhakar Shrestha is a research scientist working at Bonn University, Germany.<img src="https://superdesk-pro-c.s3.amazonaws.com/sd-nepalitimes/20221110111132/636cd3a19c7e80680e08f97bjpeg.jpg" alt="" width="89" height="103">

How transboundary haze affects Nepal

<figure><img src="https://superdesk-pro-c.s3.amazonaws.com/sd-nepalitimes/20221109181116/636be0df9c7e80680e083e18jpeg.jpg" alt="" width="750" height="1083"/><figcaption>The south face of Mt Gauri Shankar (7,134m) on the border between Nepal and China is bare rock, and shows how dramatically the snowline has receded, and the glaciers have shrunk. Photo: KUNDA DIXIT</figcaption></figure>With just 4% of the world’s population, the United States is responsible for over 15% of annual global carbon emissions. What America does or does not do will affect how fast the Himalayan ice cap will melt during this century.Which is why Joe Biden’s win in the US election is <a href="https://www.nepalitimes.com/latest/ununited-states-of-america/" target="_blank" rel="noopener noreferrer">such a big deal for the global environment</a>, including the Himalaya. Biden has announced he will reverse Donald Trump’s decision to withdraw from the 2015 Paris Climate Agreement, which ironically came into effect on 4 November, the day after the US vote.The Himalayan arc from Burma to Afghanistan is the bigg<a href="https://www.nepalitimes.com/banner/the-third-pole-is-warming-faster-than-expected/" target="_blank" rel="noopener noreferrer">est storehouse of fresh water</a> after the two polar regions, and it is warming between 0.3-0.7°C faster than the global average. The loss of Himalayan ice would have <a href="https://www.nepalitimes.com/banner/a-terrifying-assessment-of-himalayan-melting/" target="_blank" rel="noopener noreferrer">devastating consequences for 1.6 billion people</a> living in the mountains, and in downstream countries.<a style="font-size: 15px; letter-spacing: 0.01em;" href="https://www.nepalitimes.com/banner/in-just-2-years-a-nepal-peak-becomes-snowless/" target="_blank" rel="noopener noreferrer">In just 2 years, a Nepal peak becomes snowless</a>, Basanta Pratap Singh“Reversing these warming trends will begin with Biden’s commitment to re-joining the Paris agreement, as the US is not only one of the world’s greatest climate offenders but also one of its best potential leaders and sources of needed funding,” said Alton C Byers of the University of Colorado, who has <a href="https://www.nepalitimes.com/banner/tracing-past-glacial-floods-in-kangchenjunga/" target="_blank" rel="noopener noreferrer">studied Himalayan glaciers</a> for the past 30 years.The Paris Agreement aims to cap the global temperature rise in this century ‘well below’ 2°C by reducing carbon emissions through renewable energy technologies, and protecting forests and biodiversity.But rejoining the Paris accord will be the easy part. Much harder for the Biden presidency will be overcoming domestic opposition to cutting emissions at home, push rapid transition to clean energy, and funding global carbon reduction initiatives.The Biden administration may be more supportive of projects like USAID efforts in the past that have helped Nepal become a global leader in <a href="https://www.nepalitimes.com/here-now/nepals-glacial-lakes-in-danger-of-bursting/" target="_blank" rel="noopener noreferrer">glacial lake risk reduction</a>, adaptation, and climate mitigation measures.“These projects are in need of resurrection, along with the development of renewable energy technologies, sustainable tourism, and other opportunities as part of Nepal’s post-coronavirus recovery plans,” Byers added in an email interview with Nepali Times.<figure><img src="https://superdesk-pro-c.s3.amazonaws.com/sd-nepalitimes/20221109181116/636be0e19c7e80680e083e19jpeg.jpg" alt="" width="1503" height="1000"><figcaption> </figcaption></figure>Joe Biden ran on a bold climate action platform, unveiling a $2 trillion investment plan with a promise to clean up the energy sector by 2035, boost renewables and create high paying green jobs.The <a href="https://www.nepalitimes.com/opinion/a-good-man-won/" target="_blank" rel="noopener noreferrer">Biden-Harris win</a> has raised hopes among environmentalists around the world, but the world has a lot of catching up to do to reverse Trump’s systematic effort over the past four years to undermine <a href="https://www.nepalitimes.com/opinion/the-climate-threat-multiplier/" target="_blank" rel="noopener noreferrer">climate mitigation measures</a>. The new administration in January will also likely face a serious opposition from a possible Republican-led Senate as it seeks to transition America off fossil fuels."To regain credibility on climate, the US now has to show the world that it is on a path to net zero emissions by 2050, only then can America press other high-emitting countries to act with the urgency required by the climate crisis," added <a href="https://www.nepalitimes.com/banner/more-trekkers-more-trees/" data-saferedirecturl="https://www.google.com/url?q=https://www.nepalitimes.com/banner/more-trekkers-more-trees/&amp;source=gmail&amp;ust=1605077751622000&amp;usg=AFQjCNE5ey5t5tQc3eeXYvXO5z5rMSahSQ">Adam Stern</a>, a California-based climate leader, formerly with the Environmental Defense Fund."If Biden can restore the role of science in determining US climate policy, he may also be able to focus world attention on regions like the Himalaya that are already experiencing extreme climate changes,” said Stern, who has written about energy use in Nepal’s Khumbu region.<figure><img src="https://superdesk-pro-c.s3.amazonaws.com/sd-nepalitimes/20221109181116/636be0e59c7e80680e083e1ajpeg.jpg" alt="" width="1500" height="568"><figcaption> </figcaption></figure>International climate policies will have a lasting impact on the Himalaya where measurements of ice mass, temperature rise, <a href="https://www.nepalitimes.com/here-now/forests-replace-glaciers-in-the-himalaya/" target="_blank" rel="noopener noreferrer">glacial shrinking</a> and <a href="https://www.nepalitimes.com/opinion/climate-for-change/the-great-himalayan-thaw/" target="_blank" rel="noopener noreferrer">receding snowlines</a> have been more serious than previous estimates.However, experts say that Nepal also has to do its bit to accelerate its <a href="https://www.nepalitimes.com/here-now/an-energy-windfall-for-nepal/" target="_blank" rel="noopener noreferrer">shift to solar</a> and <a href="https://www.nepalitimes.com/opinion/decentralising-hydropower/" target="_blank" rel="noopener noreferrer">hydropower in generating electricity</a> for transport and household use. And since nearly a quarter of melting of Himalayan glaciers is attributed to the <a style="font-size: 16px; letter-spacing: 0.01em;" href="https://archive.nepalitimes.com/article/nation/black-carbon-easier-to-control-than-carbon-dioxide-to-reduce-global-warming%20,2079" target="_blank" rel="noopener noreferrer">deposition of soot and dust on the snow</a>, transboundary collaboration in pollution control is a must.Since October, for example, northern India has been blanketed by thick smoke from crop residue burning, and this black carbon is being blown up to the snows by prevailing westerlies. And as winter sets in, industrial and vehicular pollution will be trapped by inversion across the Indo-Ganetic plains and ultimately reduce the reflectivity of Himalayan ice cover.Air pollution was already decreasing the average lifespan of tens of millions of people in north India by 3.7 years. It killed <a href="https://www.nepalitimes.com/latest/double-whammy-air-pollution-and-covid-19/" target="_blank" rel="noopener noreferrer">42,100 people in Nepal last year</a> alone, studies show, and this winter that risk for patients with respiratory issues is combined with Covid-19 complications.<figure><img src="https://superdesk-pro-c.s3.amazonaws.com/sd-nepalitimes/20221109181116/636be0e79c7e80680e083e1bjpeg.jpg" alt="" width="1200" height="675"><figcaption> </figcaption></figure>The causes and solutions of air pollution and climate change <a href="https://www.nepalitimes.com/opinion/one-atmosphere/" target="_blank" rel="noopener noreferrer">are intricately interconnected</a>, both largely affected by human activities over time and space. In fact, short-lived pollutants like black carbon, ozone and other gases exacerbate global warming.“Dark coloured pollutants such as soot particles from diesel and forest fires absorb sunlight and warm up the air at the altitude at which they are located,” explained atmospheric scientist Arnico Panday. “If they warm the air near snow or ice surfaces they can contribute to melting. And when dark particles, including windblown desert dust, settle on snowfields or glaciers they can darken the surfaces and melt the snow and ice. <a href="http://archive.nepalitimes.com/article/nation/reducing-black-carbon-in-the-himalayas,2031" target="_blank" rel="noopener noreferrer">Certain air pollutants</a> therefore accelerate glacier melt in the Himalaya.”Even though a Biden presidency has given some hope for climate activists in the Himalaya, they point out that China has overtaken the United States, responsible for 28% of total carbon emissions in 2018. Carbon emissions in China and India are growing at a faster rate than in North America, and the two countries already contribute 37% of global greenhouse gases annually.<figure><img src="https://superdesk-pro-c.s3.amazonaws.com/sd-nepalitimes/20221109181116/636be0ea9c7e80680e083e1cjpeg.jpg" alt="" width="1884" height="1250"><figcaption> </figcaption></figure>So, while a greener America will help, the real action to slow Himalayan melting <a href="http://archive.nepalitimes.com/news.php?id=19368" target="_blank" rel="noopener noreferrer">will have to come from the immediate region</a>. The good news is there are already proven <a href="http://archive.nepalitimes.com/article/nation/brick-factories-still-using-old-polluting-technology,2078" target="_blank" rel="noopener noreferrer">clean technologies for brick kilns</a>, cement industries, solar and hydro here in Nepal and in South Asia. Governments need to incentivise these, provide subsidies, and investors need to back them up.“Air pollution has never made it to the priority of our politicians, their mentality of focusing on short-terms gains like tax revenue over long-term gains can’t be changed,” says <a href="https://www.nepalitimes.com/latest/ipcc-report-and-nepals-food-security/" data-saferedirecturl="https://www.google.com/url?q=https://www.nepalitimes.com/latest/ipcc-report-and-nepals-food-security/&amp;source=gmail&amp;ust=1605077751622000&amp;usg=AFQjCNGQzD9EPDBRXFun8S0H0x_qaZ-bbg">Manjeet Dhakal</a>, adviser to the Least Developed Countries support group at the UN Framework Convention on Climate Change (UNFCCC).He adds: “We must deploy our own young population to lobby and take part in climate action. What happens in the United States, whether international funds will be available will only help temporarily. We must cut emissions at source, educate our own people about the cost of the climate crisis, and provide alternatives.”

transboundary-pollution

Dirty snow defrosts Nepal’s mountains

Breathing can kill you

Central Nepal engulfed in smoke

How transboundary haze affects Nepal

A Biden presidency, climate and the Himalaya