Bronte Wells
Air pollution is a pressing issue that affects the health of people and ecosystems worldwide. It is caused by various sources, including mobile sources such as cars, trucks, and planes, as well as stationary sources like power plants and industrial facilities. One of the major contributors to air pollution is the combustion of fossil fuels, particularly coal, which is the dirtiest way to generate electricity. The transport sector is a significant emitter of greenhouse gases, with road vehicles being the biggest source of NOₓ, a pollutant that contributes to smog and haze. In addition, industrial processes such as oil and gas development, agricultural activities, and residential energy use for cooking and heating also play a role in air pollution. To address this global issue, interventions and initiatives are being promoted to support sustainable practices and reduce emissions, with a focus on sectors like transport, energy, and industry.
| Characteristics | Values |
|---|---|
| Sources of air pollution | Mobile sources (cars, buses, planes, trucks, and trains), stationary sources (power plants, oil refineries, industrial facilities, and factories), area sources (agricultural areas, cities, and wood-burning fireplaces), and natural sources (wind-blown dust, wildfires, and volcanoes) |
| Major outdoor pollution sources | Residential energy for cooking and heating, vehicles, power generation, agriculture/waste incineration, and industry |
| Major pollutants | Particulate matter, carbon monoxide, ozone, nitrogen dioxide, and sulfur dioxide |
| Health impact | Respiratory and other diseases, strokes, heart diseases, lung cancer, acute and chronic respiratory diseases, asthma, neurological and developmental problems |
| Global impact | Air pollution is responsible for more than 10% of all deaths worldwide (nearly 4.5 million premature deaths in 2019) and affects almost every organ and system in the body |
| Most polluting sectors | Fossil fuels, livestock production, fashion, transport, construction |
| Solutions | Sustainable land use, cleaner household energy and transport, energy-efficient housing, improved municipal waste management, regenerative agriculture, electric vehicles, alternative fuels, sustainable fuels for aviation, decarbonization of the aviation industry |
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Transport and vehicles
In the case of Kathmandu, Nepal, emissions from 1.75 million vehicles, 80% of which are two-wheelers, contribute to the thick smog that covers the valley for much of the year. David Sislen, the World Bank's country director for Nepal, Maldives, and Sri Lanka, estimates that transport accounts for about one-fourth of the fine particle matter air pollution in the valley.
The transition to electric vehicles (EVs) is a positive step towards reducing air pollution. Electric vehicles generally have a lower carbon footprint than petrol or diesel cars, and this reduction is more significant in countries with cleaner electricity sources. In addition to EVs, walking, cycling, and car-sharing are also effective ways to reduce emissions from transport.
To address carbon pollution from transportation, the US Environmental Protection Agency (EPA) has implemented various initiatives. The SmartWay program, for instance, helps the freight transportation sector improve supply chain efficiency and reduce greenhouse gas emissions. The EPA also provides resources like the Green Vehicle Guide to help consumers make environmentally friendly vehicle choices. Additionally, the Renewable Fuel Standard program aims to reduce greenhouse gas emissions by encouraging the use of renewable fuels produced from plants, crops, and biomass.
While transportation contributes a large percentage of emissions, there are opportunities to reduce its environmental impact. Low-carbon fuels, improved vehicle technologies, strategies to reduce vehicle miles traveled, and more efficient vehicle operation are all approaches that can help decrease greenhouse gas emissions from the transportation sector.
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Industrial processes
The Indian cement industry, for example, is one of the largest producers of air pollution, with cement facilities emitting significant amounts of particulate matter, contributing about 7% of worldwide carbon emissions. The production and use of fossil fuels, such as coal, oil, and natural gas, are also significant contributors to industrial air pollution. The combustion of these fuels releases toxic airborne pollutants, heavy metals, and particulate matter, which have severe health impacts. The burning of coal, in particular, is linked to the release of sulfur dioxide, contributing to acid rain and respiratory diseases, as well as nitrogen oxides, which cause respiratory issues and lung damage.
Additionally, the transportation sector, including the movement of merchandise and passenger travel, accounts for about one-fifth of global greenhouse gas emissions. Within this sector, aircraft noise and congestion in surrounding areas are also considered forms of pollution, impacting the health and well-being of residents and airport staff.
Agriculture, including livestock production and synthetic fertilizer use, is another major industrial source of air pollution. Livestock production processes generate billions of tons of CO2 and contribute to deforestation, while synthetic fertilizers release ammonia (NH3), which can react with other gases to form harmful particulate matter.
To address industrial air pollution, interventions, and initiatives are necessary to promote sustainable practices and reduce emissions. This includes implementing policies for cleaner energy and transport, energy-efficient housing, and better waste management, as well as raising awareness about the risks of air pollution and available solutions.
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Fossil fuels
PM2.5, a fine particulate matter with a diameter of up to 2.5 microns, is of particular concern as it can linger in the air, be easily inhaled, and penetrate deep into the lungs, entering the bloodstream and causing damage to multiple organs. The combustion of fossil fuels is a primary source of PM2.5, and studies have estimated that exposure to this pollutant leads to millions of premature deaths each year. For instance, a 2023 study published in The BMJ attributed 5.1 million avoidable deaths per year to air pollution from fossil fuels, with China and India accounting for nearly five million of these deaths.
Additionally, the burning of fossil fuels contributes to the formation of ozone (O3), which is also harmful to human health. While the exact number of deaths caused by ozone air pollution is not known, it is estimated to kill around half a million people annually. The impact of fossil fuel combustion on ozone levels is particularly notable in the formation of smog, which creates a thick haze in highly polluted cities.
The use of fossil fuels in industry, power generation, and transportation activities exacerbates air pollution and its associated health risks. The phase-out of fossil fuels and the transition to clean, renewable energy sources are advocated by researchers and organizations like the UN to address this issue. By reducing air pollution emissions, particularly those from fossil fuels, significant positive health outcomes can be achieved, and the global health burden of disease and mortality can be reduced.
Furthermore, the impact of fossil fuel combustion extends beyond air pollution to include other environmental concerns. The consequences of burning fossil fuels, such as melting glaciers, rising sea levels, and increasing global temperatures, contribute to the climate crisis and pose additional risks to human societies and natural ecosystems.
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Livestock production
The livestock industry has been exempt from reporting hazardous air emissions under federal law. However, a 2017 court decision would have required farmers and ranchers to report emissions from animal waste, such as ammonia and hydrogen sulfide, above certain thresholds. Congress intervened, passing a bill that exempts many farmers and ranchers from these reporting requirements once more.
Ammonia emissions are a significant concern in states with high egg production, such as Iowa. The transition to cage-free housing for egg-laying hens has resulted in reduced air quality. While cage-free housing improves animal welfare, it comes with trade-offs for air pollution.
The impact of livestock production on air quality extends beyond the immediate vicinity of farms. In the Upper Midwestern Corn Belt, particularly east of Iowa, wind blows air pollutants from hog-producing areas into large population centers. This exposure to fine particulate matter (PM 2.5) increases the risk of heart disease, cancer, stroke, and respiratory illnesses for residents in these downwind areas.
To address air pollution from livestock production, researchers have suggested several remedies. These include better waste management, more efficient fertilizer application, and dietary shifts. By implementing these changes, an estimated 7,900 lives could be saved annually. Additionally, a national shift from red meat to poultry could prevent 6,300 deaths, while adopting vegetarian, vegan, or flexitarian diets could avert 10,700 to 13,100 deaths due to improved air quality.
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Fashion
The fashion industry is widely believed to be the second most polluting industry in the world, after food and construction. The industry emits more carbon than international flights and maritime shipping combined, contributing to about 10% of global carbon emissions. This figure is expected to increase by more than 50% by 2030 if the current business model persists.
Fast fashion, a term coined by the New York Times in the 1990s to describe Zara's rapid turnaround, is a significant contributor to the industry's carbon footprint. Fast fashion refers to the business model of quickly producing cheap, low-quality clothing that copies the latest trends. This model is based on mass production, low prices, and high sales volumes, promoting a throwaway culture that generates an estimated 92 million tonnes of textile waste globally each year. This figure is projected to reach 134 million tonnes annually by 2030.
The environmental impact of fast fashion extends beyond carbon emissions. It involves the depletion of non-renewable sources, the emission of greenhouse gases, and the use of massive amounts of water and energy. The industry is the second-largest consumer of water, requiring about 700 gallons to produce one cotton shirt and 2,000 gallons for a pair of jeans. It is also responsible for water pollution, as the water leftover from the dyeing process is often dumped into ditches, streams, or rivers.
Textile manufacturing uses chemicals during spinning, weaving, and other processes, releasing toxic substances that harm the natural environment and create an unsafe environment for factory workers and cotton farmers. Synthetic materials used in fast fashion, such as polyester, nylon, and elastane, contribute to the global microplastics problem. These synthetic fibres take hundreds of years to biodegrade and end up in our oceans, primarily through washing machines.
Some fast fashion companies that have been identified as major contributors to environmental pollution include Shein, Uniqlo, Forever 21, and Zara. However, it is important to note that some companies within the industry are integrating sustainability principles into their business strategies, such as H&M, Guess, and Patagonia.
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Frequently asked questions
There are several large producers of air pollution, including:
- Transport, especially road vehicles
- Fossil fuels
- Livestock production
- Fashion
- Construction
Air pollution is responsible for more than 10% of all deaths worldwide, causing nearly 4.5 million premature deaths in 2019 alone. It can affect almost every organ and system in the human body, and can lead to strokes, heart disease, lung cancer, acute and chronic respiratory diseases.
Mobile sources, such as cars, buses, planes, trucks, and trains, are responsible for more than half of all air pollution in the United States. Stationary sources, such as power plants, oil refineries, and industrial facilities, also emit large amounts of pollution. Other sources include agricultural areas, cities, wildfires, and volcanoes.
