Southeast Asia Faces Up to $591 Billion in Air Pollution Losses by 2050 Despite Cleaner Average Air

Cleaner averages, a growing death toll

Deaths linked to air pollution in Southeast Asia could rise by up to 10 percent by 2050, even as average concentrations of fine particles decline. An analysis led by Steve Yim of Nanyang Technological University in Singapore puts the economic value of those lost lives at about $447 billion under a pathway with low emissions and about $591 billion under a pathway with high emissions.

The study, published in a leading environmental health journal, projects that average concentrations of fine particulate matter, known as PM2.5, could fall by 2 to 10 percent across the region by the middle of the century. Yet some of the places most vulnerable to climate change, including southern Thailand and Indonesia's southern islands, are expected to experience higher pollution levels and more frequent severe episodes.

Residents and workers in these hotspots face repeated exposure to harmful air. A regional average combines conditions across many places, so improvements elsewhere can sit alongside worsening conditions in communities where exposure is already dangerous. The researchers point to both the location of pollution and the people exposed to explain why cleaner average air can accompany more deaths.

More than 90 percent of the 2.5 billion people living in East and Southeast Asia breathe air exceeding World Health Organization guidelines for PM2.5 and ground level ozone. Exposure increases the risk of ischemic heart disease, stroke, lung cancer and chronic obstructive pulmonary disease. Ischemic heart disease involves an inadequate blood supply to the heart, while chronic obstructive pulmonary disease causes persistent breathing difficulties.

Air pollution harms nearly every organ system. It also reduces labor productivity and household income, making the response a matter of public health and economic growth.

What the billions of dollars represent

The projected $447 billion to $591 billion range measures the social value of lives lost and reduced productivity. It represents a broad welfare loss borne by families, workplaces and economies when people die earlier than they otherwise would. Hospital bills and public health budgets are different measures.

The calculation uses a common economic method that values reductions in mortality risk across society. Its purpose is to put a monetary value on lost output, diminished productivity and the intangible cost of premature death. In everyday terms, the estimate describes what residents, employers and governments forfeit when pollution cuts lives short.

The study modeled three emissions pathways shaped by choices in energy, transport, land use and industrial activity. Even the pathway in which emissions fall faster produces very large welfare losses. Vulnerable communities remain exposed to intense pollution episodes, while each additional year of exposure adds to disease risk for many residents.

The difference between the low and high estimates is about $144 billion, calculated from $591 billion minus $447 billion. Policy choices therefore affect the scale of the projected loss, even though substantial damage persists under the cleaner pathway.

A World Bank assessment offers another measure of the burden. It found that Central, South and Southeast Asia together lost as much as 11 percent of their 2019 gross domestic product when the welfare cost of PM2.5 exposure was considered. That percentage expresses the value of lives cut short and healthy years lost in relation to what those economies produced.

Families experience these losses through illness, reduced earnings and premature deaths. Employers face reduced productivity, while governments must weigh the benefits of cleaner air alongside the spending required to achieve it.

Why smoke keeps returning across borders

Vehicles, diesel engines, power plants burning coal and other fossil fuels, factories, construction sites, shipping corridors and household fuels all contribute to Southeast Asia's air pollution. Cities face emissions from many of these sources at once.

Outside urban areas, seasonal burning of crop residues, forest clearing and peatland fires can cover entire subregions in smoke. Peatlands contain accumulated organic material that can burn, making fire prevention and land management central to controlling severe haze.

Smoke crosses national borders, disrupts transport and tourism, and sends respiratory cases surging in clinics. The damage also reaches forests, fisheries and wildlife habitat. A fire season can therefore affect health, businesses and natural resources far beyond the area where the burning began.

Indonesia's fires in 2015 cost an amount equal to 1.9 percent of its gross domestic product, with immediate losses reaching 221 trillion rupiah. Estimates covering multiple major fire events between 2004 and 2015 add up to tens of billions of dollars.

Drought, land clearing and peat ignition can combine to make air quality collapse rapidly. Improvements in pollution during quieter years leave communities exposed to the disruption caused by a severe fire season.

Research in Upper Southeast Asia also shows how smoke changes the chemistry of the air. Volatile organic compounds, gases involved in reactions that create other pollutants, rise sharply during smoke seasons. They accelerate the formation of ozone and secondary particles, which develop in the atmosphere rather than being released directly from a source.

During smoke haze periods, the potential to form ozone and organic aerosols can be several times higher than before the haze. Organic aerosols are airborne particles containing organic material. This chemistry helps explain how a short burning season can erase months of incremental progress in controlling urban emissions.

How polluted air damages health

PM2.5 and ground level ozone are the two pollutants most closely tied to premature death. PM2.5 consists of fine particles that penetrate deep into the lungs, move into the bloodstream and contribute to cardiovascular disease. Ground level ozone forms when nitrogen oxides and volatile organic compounds react in sunlight. It irritates airways and reduces lung function.

Residents of the region's most polluted cities accumulate exposure year after year. Analyses of 2020 data still found large death tolls and substantial economic losses in megacities, despite uneven changes in emissions associated with lockdowns.

A study covering several Southeast Asian countries linked higher PM2.5 and carbon dioxide emissions to higher lung cancer risks between 2000 and 2016. Greater use of renewable energy and higher health spending per person were associated with lower lung cancer prevalence.

The authors urged governments to shift subsidies from fossil fuels to clean energy and consider carbon taxes, especially in power generation. Their argument was that gains in health and productivity over the longer term outweigh the immediate growth benefits of cheap fossil fuels.

Children are more sensitive to air pollution, and exposure inside homes can combine with pollution outdoors. Outdoor workers face additional risks because their jobs keep them in polluted air. Researchers have called for occupational exposure rules, better protective equipment and cleaner technologies at worksites.

In Lao PDR, an open source project supported by UNICEF and national partners is developing a machine learning model to estimate air quality for every village in real time. The model uses low cost sensors and open data to help fill gaps in monitoring.

Schools, clinics and local officials are the intended users. Timely information could help them protect children and maintain learning during days with high pollution, including in places where conventional monitoring is limited.

Heat and dry weather reshape exposure

Changing weather patterns affect how pollution forms, moves and clears. Reduced rainfall during dry seasons limits the natural cleaning of the air, allowing particles and ozone to build up for longer. Hotter days accelerate the chemistry that produces ozone.

Drier landscapes also make fires easier to start and harder to extinguish. El Nino years often bring longer, hotter dry seasons to parts of Southeast Asia, conditions that tend to intensify smoke episodes.

These changes help explain the study's central finding. Average annual PM2.5 can edge downward in some places while the worst pollution days become more frequent or more intense in vulnerable areas. People living through those episodes face a different pattern of exposure from the one suggested by the regional average.

Climate policy and air quality policy can address some of the same sources. Cutting black carbon and methane reduces warming and health risks. Preventing peatland drainage and managing agricultural residues without burning can avoid large smoke events while keeping carbon in the ground.

Replacing coal with renewable energy, improving grid efficiency and electrifying transport can reduce greenhouse gases and harmful air pollutants together. The study's emissions pathways depend on choices across these sectors, connecting decisions about development with future exposure.

The cost reaches workplaces and food supplies

Air pollution reduces work hours, increases absenteeism and lowers productivity in factories, farms and offices. It also affects test scores, cognitive performance and tourism demand. These losses extend beyond the immediate strain on hospitals.

City estimates from 2020 illustrate the scale. Delhi's air pollution was associated with tens of thousands of premature deaths that year. Jakarta recorded thousands of avoidable deaths and billions of dollars in economic losses, while Tokyo's financial toll reached tens of billions of dollars. Each estimate describes its own city's burden.

Regional assessments indicate that Cambodia, Indonesia and Thailand could save hundreds of thousands of lives and tens of billions of dollars in health costs by 2030 through stronger air quality policies. One estimate for Thailand put the annual cost of a clean air strategy at around $4 billion by 2030, with the cost of inaction about three times higher.

Agriculture faces another loss. Tropospheric ozone, meaning ozone in the lower atmosphere, can reduce yields of rice, wheat, maize and soy by 5 to 20 percent. That adds pressure to food supplies in a region already facing food security concerns.

Renewable energy and energy efficiency are now competitive on cost in many markets. Cleaner transport can reduce congestion and improve access to jobs. Cities that have implemented targeted clean air programs have often achieved returns exceeding their initial spending because fewer people become ill, families miss fewer workdays and businesses experience fewer disruptions.

National measures and regional cooperation

Singapore established a national advisory committee on ambient air quality to align targets with guidelines based on science. Ambient air means the surrounding outdoor air that people breathe.

In Indonesia, a landmark court decision in 2019 ordered stronger national and regional standards in response to citizen lawsuits. The legal action placed responsibility for air quality on public authorities as residents sought stronger protection.

Governments are also working toward the ASEAN Power Grid, which aims to integrate cleaner energy across borders and improve reliability. Electricity cooperation sits alongside efforts to reduce smoke moving between countries.

The regional haze response includes the ASEAN Agreement on Transboundary Haze Pollution, the Haze Free Roadmap and the new ASEAN Coordinating Centre for Transboundary Haze Pollution Control. Peatland strategies, investment frameworks for sustainable land management and shared early warning systems have also expanded.

Enforcement and data transparency remain gaps in these efforts. Preventing fires, sharing warnings and controlling emissions require action across national boundaries because the smoke affecting one country may originate in another.

Changes in power, industry and transport

A set of measures based on science for Asia and the Pacific identifies emissions controls and development policies that could bring safer air to hundreds of millions of people by 2030 if adopted widely. Energy, industry and transport are major parts of that response.

Replacing coal with wind, solar and modern gas plants where needed can reduce PM2.5, sulfur dioxide, nitrogen oxides and carbon dioxide. Cleaner fuels and tighter emissions standards for industrial boilers, kilns and furnaces can reduce local pollution quickly.

Redirecting public money from fossil fuel subsidies toward targeted support for clean power and energy efficiency can speed the transition. Evidence points to benefits for public health and growth over the longer term. Carbon pricing in the power sector can also steer private investment toward cleaner options when designed well.

Transport measures include stronger vehicle emissions standards, the gradual introduction of electric buses and two wheelers, and better public transport. These changes can produce large health benefits while making travel easier.

Road dust control, better vehicle inspection systems and cleaner construction practices can reduce spikes in urban particle pollution. Low emission zones and measures that manage traffic demand can curb the most polluting journeys.

Ports and shipping corridors need attention too. Cleaner shipping fuels and port electrification can reduce pollution hotspots near harbors, where maritime activity contributes to local exposure.

Preventing fires and cleaning household air

Ending open burning of crop residues and enforcing policies against burning on peatlands are central to preventing the worst smoke episodes. Farmers need practical alternatives, including collecting residues for bioenergy or compost and using machinery for land clearing.

Investment in peatland rewetting and community fire management can lower the risk of ignition. Greater transparency about land concessions, together with accountability along supply chains, can make illegal burning harder to sustain.

Waste management is another part of pollution control. Stopping open trash burning and expanding waste collection and recycling can reduce a persistent source of toxic smoke.

Clean cooking fuels and technologies reduce exposure inside homes while also lowering outdoor pollution in densely populated neighborhoods. Programs that replace inefficient stoves and promote cleaner fuels protect women, children and older people who spend more time near household pollution sources.

These measures address different parts of the same exposure problem. A household may face smoke from cooking, nearby waste burning and a regional haze episode, so progress depends on reducing emissions at several sources.

Better warnings and protection during polluted days

Dense monitoring networks, satellite data and open platforms allow officials to target interventions and warn the public when pollution rises. Low cost sensors combined with machine learning can fill gaps in rural areas and smaller towns, as the work in Lao PDR demonstrates.

Cost estimators operating in real time can translate PM2.5 measurements into health and economic measures, helping decision makers weigh policy choices. Regional data sharing and joint response procedures can limit disruption from pollution crossing borders. Workplace exposure standards and rules for protective equipment can protect people whose jobs keep them outdoors.

Public agencies can issue clear guidance for schools and workplaces during days with high pollution. Measures include moving activities indoors, wearing certified respirators and using portable air cleaners in classrooms and clinics. Hospitals can adjust staffing when forecasts predict pollution spikes.

Farmers can receive support to stop burning crop residues. City residents can check local air quality indices, plan commutes around peak pollution hours and choose cleaner transport where available.

Personal precautions work best alongside national standards and regional cooperation that reduce pollution at its source. For Southeast Asia, the challenge is to make improvements reach the communities facing the most intense exposure, while preventing severe episodes from undoing gains made during cleaner periods.

The Bottom Line

• Deaths linked to air pollution in Southeast Asia could rise by up to 10 percent by 2050, even as average PM2.5 concentrations fall by 2 to 10 percent.
• The study led by Steve Yim estimates welfare losses of about $447 billion to $591 billion, depending on the emissions pathway.
• Southern Thailand and Indonesia's southern islands are among the vulnerable areas expected to face higher pollution and more severe episodes.
• More than 90 percent of 2.5 billion people in East and Southeast Asia breathe air exceeding World Health Organization guidelines for PM2.5 and ground level ozone.
• Indonesia's 2015 fires cost the equivalent of 1.9 percent of its gross domestic product, with immediate losses reaching 221 trillion rupiah.
• Stronger air quality policies could save hundreds of thousands of lives and tens of billions of dollars in health costs in Cambodia, Indonesia and Thailand by 2030.
• Cleaner power, transport, industry, household fuels and waste management, together with fire prevention, can reduce exposure.
• ASEAN cooperation and better monitoring are advancing, while enforcement, data transparency and protection for vulnerable communities remain central needs.