Meghan Hodges
Air pollution is a pressing issue that contributes to an estimated 7 million deaths worldwide each year. While there are various sources of air pollution, including fossil fuels, agro-waste, and vehicular emissions, certain industries bear a significant responsibility for the emission of harmful pollutants. The energy industry, encompassing the burning of fossil fuels for electricity and heat, is a major contributor to global air pollution. Other notable industries include transportation, manufacturing, and construction, which generate substantial amounts of greenhouse gas emissions annually. The fashion industry, with its complex supply chain, also contributes to air pollution through direct carbon emissions, chemical usage, and the energy consumption of its manufacturing processes. Furthermore, the U.S. Military has been identified as a significant polluter, producing hazardous waste that surpasses that of major chemical companies.
| Characteristics | Values |
|---|---|
| Most polluting industries | Energy, transport, manufacturing & construction |
| Energy industry emissions | 15.83 billion tonnes of GHGs emissions annually |
| Transport industry emissions | 8.43 billion tonnes of GHGs emissions annually |
| Manufacturing & construction industry emissions | 6.3 billion tonnes of GHGs emissions annually |
| Fossil fuels emissions | 34 billion tonnes of GHG emissions each year |
| Commercial and residential sector emissions | Substantially increased due to electricity use |
| US Greenhouse Gas emissions | Decreased by over 3% since 1990 |
| Fashion industry ranking | Second-worst industry for pollution |
| Fashion industry emissions | Carbon emissions, chemical usage, water usage, trucking and transport, metal smelting, leather tanning, fabric dying |
| Industrial air emission pollutants | Nitrogen oxides (NOx), sulfur dioxide (SO2), carbon monoxide (CO), suspended particulate matter |
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Energy and electricity
Coal-fired power plants are a major contributor to air pollution, with coal mining, transportation, and combustion processes all emitting harmful substances. The burning of coal releases nitrogen oxides (NOx), sulfur dioxide (SO2), carbon monoxide (CO), and particulate matter, which are known as classic air pollutants by the World Health Organization (WHO). These pollutants contribute to the formation of photochemical smog and acid rain, which have been linked to respiratory issues, lung cancer, and the depletion of the stratospheric ozone layer.
Oil and natural gas development, including hydraulic fracturing or fracking, can also release air emissions. Additionally, the transportation of these fuels to power plants can create additional emissions, with diesel locomotives, pipelines, and storage facilities contributing to pollution. Oil and gas workers are exposed to harmful gases and leaks, increasing their risk of cancer and other health issues.
The use of biomass as a fuel source is not exempt from criticism. While it is often considered a renewable alternative, biomass combustion produces air pollutants and particulate matter, such as ash and soot.
Nuclear power, which relies on uranium fuel, has been associated with an increased risk of lung cancer for miners. The extraction and transportation of uranium can also impact air quality.
The transition to clean and renewable energy sources is critical for improving air quality and lung health. Solar, wind, geothermal, and tidal power sources are considered "zero-emission" alternatives that can significantly reduce health risks and premature deaths associated with air pollution.
Furthermore, energy efficiency programs and policies have proven effective in reducing air pollution from energy generation and transport. Mandatory energy savings initiatives, building retrofits, heat-metering reforms, and vehicle emission standards have all contributed to improving air quality.
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Transport
The transport sector is a significant contributor to air pollution, with road traffic being the most pervasive issue. Private cars, trucks, and small passenger vehicles are some of the largest sources of transport-related air pollution, emitting carbon dioxide, nitrogen oxides, and particulate matter. The burning of fossil fuels, such as petrol and diesel, used to power these vehicles, releases harmful pollutants into the atmosphere. Non-combustion sources, such as tyre and brake wear, also contribute, especially in densely populated urban areas.
The impact of the transport sector on air quality and public health is significant, with an estimated 4.2 million premature deaths attributed to outdoor air pollution. Higher air pollution concentrations increase the risk of cardiovascular and respiratory diseases, cancer, and adverse birth outcomes. Additionally, children living in areas with high aircraft noise experience negative consequences such as delayed reading ages, poor attention levels, and high-stress levels.
To mitigate the impact of transport-related air pollution, measures such as transitioning to electric vehicles, encouraging shared mobility, and reducing traffic volumes in neighbourhoods through the adoption of public transport systems, safe cycling, and pedestrian infrastructure have been proposed. In Western European cities, local traffic reduction measures and the introduction of technology, such as three-way catalysts, have substantially reduced emissions.
While road transport is the primary concern, aircraft emissions are also a growing source of air pollution, especially with the projected increase in air traffic. Additionally, global shipping contributes to air pollution through the emission of sulphur compounds, which contribute to acid deposition and stratospheric ozone depletion.
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Manufacturing and construction
The sources of air pollution in construction sites are demolition dust, heavy machinery, and material transport. Demolition releases vast amounts of fine particles into the air, which can remain suspended for extended periods, depending on weather conditions. Heavy machinery, such as trucks, cranes, and excavators, often run on diesel fuel, producing pollutant gases like nitrogen oxides and carbon monoxide. Additionally, the movement of vehicles and construction equipment generates dust and emissions, particularly in unpaved or high-traffic areas.
To mitigate the environmental impact of construction, various technologies and practices have been implemented. For example, irrigation and sprinkler systems, or watering and misting systems, are used to control dust by keeping worksite surfaces damp, thus reducing airborne particulate matter. Countries and agencies worldwide have also implemented regulatory frameworks to manage pollution exposure. For instance, in California, employers must provide respirators for employees when the Air Quality Index (AQI) for PM2.5 is between 151 and 500, and respirator use becomes mandatory after the AQI surpasses 500.
In the manufacturing industry, industrial pollution refers to the contamination of the air, water, and soil caused by manufacturing activities, including the processing and extraction of raw materials. This results in waste products and emissions harmful to the environment and human health. Refineries, for instance, emit airborne pollutants such as PM2.5, sulfur dioxide, nitrogen oxides, and carbon monoxide. Petrochemical plants, which process hydrocarbons from crude oil and natural gas, release pollutants such as PM2.5, sulfur dioxide, nitrogen oxides, and VOCs like benzene.
Mining activities, another aspect of the manufacturing industry, release airborne pollutants such as PM2.5, silica dust, coal dust, and gases like methane, carbon monoxide, sulfur dioxide, and nitrogen oxides. The use of explosives and chemicals in mining also contributes to the emission of volatile organic compounds (VOCs).
To address industrial pollution, it is crucial to acknowledge the impact of these activities and explore potential solutions. This includes adopting cleaner and more sustainable practices, improving enforcement of environmental standards, and utilizing advanced technologies for monitoring and control, such as air monitoring systems, to support a shift towards safer and more sustainable construction and manufacturing practices.
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Fashion
The fashion industry has a significant impact on air pollution, and is often ranked as the world's second-worst polluting industry after oil. The environmental impact of the fashion industry, particularly fast fashion, is extensive and far-reaching.
The production of garments contributes to air pollution in several ways. One significant factor is the emission of greenhouse gases, with the fashion industry accounting for between 5% and 10% of global greenhouse gas emissions. This includes carbon emissions from the energy used during production, manufacturing, and transportation. The industry's heavy reliance on synthetic fibres such as polyester, nylon, and acrylic, which are derived from fossil fuels, intensifies the problem. The production of these synthetic fibres is energy-intensive and releases pollutants and greenhouse gases.
Textile dyeing is another major contributor to air pollution in the fashion industry. It is the second-largest polluter of water, as the toxic wastewater leftover from the dyeing process is often dumped into natural water bodies. The World Resources Institute emphasizes the need for business models that maximize the useful life of clothes, as washing clothes also releases microfibres into the ocean, contributing to plastic pollution.
The fashion industry's complex supply chains and globalized production networks further complicate the issue of air pollution. Developing nations, such as China, have become hubs for garment production due to cheap labour, tax breaks, and lenient laws and regulations. However, these countries often have inadequate environmental regulations, resulting in land degradation and air pollution. The transportation of goods across long distances in the fashion industry's supply chain also contributes to carbon emissions and air pollution.
The social and environmental costs of the fashion industry, especially fast fashion, are driving a growing movement towards sustainable fashion. Initiatives like the Detox campaign by Greenpeace aim to expose the links between global clothing brands and toxic water pollution. Organizations are advocating for more sustainable business models that respect people, the environment, and animals. The shift towards slow fashion emphasizes mindful consumption, simplified supply chains, and the extension of clothing lifespans to reduce the environmental impact of the fashion industry.
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Fossil fuels
The combustion of fossil fuels, such as coal, gasoline, diesel, and petrol, is a significant source of airborne particulate matter and ground-level ozone. These pollutants can remain in the air for extended periods, posing risks to human health, particularly for children, older individuals, and those with lower incomes or living in urban areas. Exposure to PM2.5 can cause severe health issues as the particles are readily inhaled and can penetrate deep into the lungs, entering the bloodstream and damaging multiple organs.
The environmental impact of fossil fuel air pollution is also significant. It contributes to global warming, depletes the stratospheric ozone layer, and leads to extreme pollution, such as that seen in New Delhi, which could further aggravate the ongoing COVID-19 crisis. The consequences of burning fossil fuels include melting glaciers, rising sea levels, and increasing global temperatures, all of which pose severe threats to ecosystems and human societies.
To address the health and environmental crises caused by fossil fuel air pollution, a global phase-out of fossil fuels is necessary. Researchers advocate for a transition to clean, renewable energy sources, which would significantly reduce air pollution emissions and help combat global heating. This shift has the potential to bring about substantial health benefits, saving millions of lives from the deadly impacts of fossil fuel combustion.
While the fashion industry is often cited as the world's second-worst polluting industry after oil, the calculation of pollution and its contributors is complex. The fashion industry's direct carbon emissions, chemical usage, water usage, and transportation methods must be considered, along with their overlap with other industries, such as metal smelting, leather tanning, and fabric dying.
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Frequently asked questions
The energy industry is the most polluting industry in the world, generating 15.83 billion tonnes of GHG emissions annually. This is largely due to the burning of fossil fuels, which release carbon dioxide into the atmosphere.
Other major polluting industries include transport, manufacturing and construction.
The fashion industry is considered the second-worst polluting industry after oil. It contributes to air pollution through its carbon emissions, chemical usage, water usage, and reliance on transport.
Air pollution is caused by the emission and dispersion of toxic pollutants such as dust particles, gases, and smoke. These pollutants are released by industrial processes, fossil fuels, agro waste, and vehicular emissions.
While not considered an industry, the U.S. Military is the single greatest polluter in the world, producing more hazardous waste than the five largest chemical companies combined.
Economic production can impact air pollution through industrial emissions, which often cross multiple jurisdictions. Improvements in local air quality have been driven by local authorities, but the burden of emissions is often felt in underrepresented communities.
