Helena Joyce
Pollution is a pressing global issue that poses significant risks to human health and the environment. It takes many forms, including air, water, and land pollution, and is caused by a variety of human and natural sources. While pollution is a worldwide problem, it disproportionately affects low- and middle-income countries, with 99% of the global population breathing unhealthy air. The primary sources of pollution vary across regions, with transport emissions, industrial activities, and the combustion of fossil fuels being major contributors to poor air quality. Natural sources of pollution include windblown dust, wildfires, and volcanic activity. The health impacts of pollution are wide-ranging, including respiratory and cardiovascular issues, and it is estimated that pollution causes 7 million premature deaths annually.
| Characteristics | Values |
|---|---|
| Type of pollution | Air, water, land |
| Sources of air pollution | Residential (cooking, heating, electricity generation), transport, industrial activities, agriculture, combustion of fossil fuels, biomass burning, windblown dust, volcanic smoke, wildfires, dust or sandstorms |
| Health impact | Affects nearly every organ and system in the body, leading to respiratory and cardiovascular issues, meningococcal meningitis, conjunctivitis, skin irritations, and more |
| Global impact | 7 million premature deaths annually, with more than 90% of deaths occurring in low- and middle-income countries |
| Economic impact | Equivalent to 5-14% of countries' GDPs |
| Environmental impact | Acid rain, eutrophication, interference with root cell division and elongation, reduction of essential nutrients for plants, threat to wildlife |
| Regions affected | Asia, particularly India, Pakistan, and other developing countries |
| Progress | Some countries like the Philippines, Indonesia, and Brazil are making progress in reducing air pollution |
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What You'll Learn
Air pollution in Asia
Air pollution is a significant issue in Asia, with the region displaying some of the highest recorded levels of air pollution globally. Over 2.3 billion people in the Asia Pacific region are exposed to air pollution levels that far exceed the World Health Organization's (WHO) guidelines for safe air. According to the WHO, the recommended limit is 10 micrograms per cubic meter, but this limit is often not met in many parts of Asia.
In 2015, East Asia and the Pacific accounted for 35% of global deaths from outdoor air pollution, while South Asia accounted for about 33%. Urban and heavily industrialized areas with high population densities, such as those found in East and Southeast Asia, tend to have the highest levels of air pollution. The primary sources of this pollution vary by country but are generally linked to a handful of activities. For example, black carbon, a significant air pollutant, is produced by diesel soot, road dust, brake and tyre wear, trash burning, barbecues, cookstoves, industrial activity, and agricultural burning.
The effects of air pollution in Asia are devastating, with Southeast Asia, East Asia, and Oceania having the second-highest rate of premature deaths from fine particulate matter (PM2.5) in 2021, resulting in approximately 2.3 million deaths in China, 221,600 in Indonesia, 101,600 in Myanmar, 99,700 in Vietnam, and 98,200 in the Philippines. According to the United Nations Environment Programme (UNEP), taking meaningful steps to reduce air pollution in these countries could save a combined 230,000 lives.
To address the issue of air pollution in Asia, various measures have been proposed and implemented. These measures include conventional emission controls, such as introducing state-of-the-art end-of-pipe measures to reduce sulphur dioxide and nitrogen oxide emissions from power stations and large-scale industries. Additionally, there is a focus on improving energy efficiency standards for industries, strengthening emission standards for road vehicles, and enforcing mandatory vehicle inspections and maintenance. By investing in renewable energy, imposing stricter vehicle emission standards, and promoting the transition to electric cars, countries like Indonesia can significantly improve air quality and reduce their greenhouse gas emissions.
While some countries in Asia are making progress in reducing air pollution, it remains a critical issue that requires continued efforts and collaboration to ensure a sustainable future for the region.
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Pollution in low-income countries
Air pollution is one of the leading causes of health complications and mortality worldwide, and it disproportionately affects people in low-income countries. According to the World Health Organization (WHO), air pollution is responsible for more than 10% of all deaths worldwide, with nearly 4.5 million premature deaths in 2019. This figure does not include the additional 2 million deaths caused by indoor air pollution, which is more prevalent in low-income countries.
Indoor air pollution, also known as household air pollution, is a significant issue in low-income countries due to the reliance on solid fuels, such as wood and dung, for cooking and heating. The use of inefficient cooking stoves and open fires leads to high levels of exposure to particulate matter and other pollutants, particularly for women and children who spend more time in the kitchen or polluted living spaces. This not only impacts their health but also limits their opportunities for education and income generation, trapping them in a cycle of poverty.
Outdoor air pollution is also a concern in low-income countries, especially as they industrialize and shift from low to middle-income statuses. Less stringent air quality regulations, older polluting machinery and vehicles, fossil fuel subsidies, congested transport systems, and rapidly developing industrial sectors contribute to higher levels of outdoor air pollution in these countries. Additionally, marginalized and low-income communities within these countries often bear the brunt of pollution, experiencing higher pollution levels and suffering greater health consequences.
Geographically, Sub-Saharan Africa, South-East Asia, and the Western Pacific have been identified as regions with high rates of health problems stemming from indoor pollutants related to household energy use. Within these regions, rural households are particularly vulnerable due to their limited access to cleaner fuels and technologies. Similarly, windblown dust is a significant source of pollution in portions of Africa and West Asia close to deserts, causing respiratory and cardiovascular issues, as well as other health problems.
While some countries, such as the Philippines, Indonesia, and Brazil, are making progress in reducing air pollution, it remains a critical issue in many low-income countries. It is essential to address this problem to improve public health, promote development, and mitigate the environmental impacts of air pollution, such as acid rain and eutrophication.
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Natural sources of pollution
Some natural sources of air pollution are organic compounds from plants, sea salt, suspended soils, and dust. Ozone is one of the most common natural air pollutants, formed in the atmosphere via complex chemical reactions occurring between nitrogen dioxide and various volatile organic compounds (VOCs). VOCs vaporize at or near room temperature and are given off by paints, cleaning supplies, pesticides, some furnishings, and craft materials like glue. Gasoline and natural gas are also major sources of VOCs, which are released during combustion.
Animals such as cows and sheep are another natural source of pollution, releasing large amounts of methane through belching and flatulence. Methane is a colourless gas produced in their stomachs when bacteria break down the food they eat. Livestock is the biggest source of methane worldwide, and it is the second most important greenhouse gas, which can cause climate change.
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Pollution from transport
Air pollution from transport is a pressing issue that affects the health and well-being of millions of people worldwide. Transport systems release a variety of pollutants that negatively impact air quality, public health, and the environment. These pollutants are released into the atmosphere due to the operation of vehicles and transport systems. While private cars and small passenger vehicles are among the largest sources of transport-related air pollution, other modes of transport, such as global shipping and aviation, also contribute to the problem.
Private cars and small passenger vehicles emit harmful substances, including carbon dioxide (CO2), nitrogen oxides (NOx), and particulate matter (PM). The widespread use of petrol and diesel vehicles in urban and suburban areas makes emission reduction in these sectors a key focus. CO2 is a long-lived greenhouse gas and a byproduct of burning fossil fuels. While it is not directly harmful to human health at low concentrations, it significantly contributes to global warming and climate change. Transitioning to electric vehicles and encouraging shared mobility are crucial steps to reduce the impact of this sector.
Nitrogen oxides (NOx) are a group of reactive gases, including nitrogen dioxide (NO2) and nitric oxide (NO), primarily released from vehicle exhaust. NOx contributes to the formation of ground-level ozone (O3), a major component of smog. Long-term exposure to ozone can lead to the development of asthma and aggravate respiratory diseases. Additionally, non-exhaust sources, such as tyre and brake wear, contribute significantly to air pollution, especially in urban areas with high traffic density.
The transport sector is the fastest-growing contributor to climate emissions due to rapid motorization and increasing energy use. In 2010, the sector accounted for 14% of the global greenhouse gas budget. While road transport pollution has decreased in recent years, emissions from shipping and aviation have increased for some pollutants. The COVID-19 pandemic temporarily reduced transport volumes and emissions, but an upturn in pollution from transportation was observed in 2021 and 2022 as volumes rebounded.
Addressing transport-related air pollution is essential for mitigating its impact on human health and the environment. Strategies for cleaner and more sustainable transport systems include transitioning to renewable energy sources, increasing vehicle efficiency, and promoting electric and hybrid vehicles. Additionally, adapting pollution reduction technologies in the maritime sector and improving fuel efficiency in the aviation industry can significantly reduce air pollutant emissions.
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Landfills and land pollution
Landfills are necessary for the proper disposal of solid waste. They help to prevent disease transmission and keep communities clean. However, they also have significant environmental and social impacts. Landfills are associated with air, water, and land pollution, which can have adverse health effects on people, especially children.
The creation of landfills often involves the destruction of natural habitats for wildlife. The average landfill size is 600 acres, and with over 3,000 active landfills in the United States alone, a significant amount of habitat has been lost. Landfills are also often located in minority and low-income areas, which have fewer resources to oppose their placement.
The decomposition of organic mass in landfills leads to the release of methane, carbon dioxide, water vapour, and trace amounts of other gases. Methane is a potent greenhouse gas, contributing to climate change. These emissions can also create smog and are linked to an increased risk of respiratory diseases, congenital malformations, and other health issues.
Leachate, a liquid produced by landfill sites, can contaminate nearby water sources. It often contains high levels of ammonia, which can cause eutrophication and create "dead zones" where animals cannot survive due to a lack of oxygen. Additionally, the conditions in landfills, with limited oxygen and moisture, can cause waste to take years to decompose, further prolonging their environmental impact.
To mitigate the impact of landfills, some practices can be implemented, such as reducing waste through recycling, composting, and avoiding single-use plastics. While landfills serve a necessary purpose, finding alternatives and reducing their environmental footprint is crucial for the well-being of both ecosystems and human populations.
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Frequently asked questions
According to IQAir's 2022 World Air Quality Report, most of the world's 50 most polluted cities are in Asia, particularly India and Pakistan.
Manmade sources are the leading contributor to air pollution in cities. These include various forms of combustion, such as gas-powered transportation and industrial businesses. Residential pollution, from cooking and heating using biomass, is also a major contributor.
Landfills and dumpsites are a significant source of land pollution, threatening local wildlife and the health of nearby residents. Landfills are common in middle- and low-income countries and communities, which are often at greater risk of land pollution and its negative health impacts.
