Brian Barton
Air pollution is a pressing issue that poses a significant threat to both human health and the environment. It is caused by a range of sources, including the combustion of fossil fuels, household activities, motor vehicles, industrial facilities, and forest fires. According to the World Health Organization (WHO), almost the entire global population (99%) breathes air that exceeds the recommended guideline limits, with low- and middle-income countries suffering the highest exposures. In recent decades, global efforts to reduce air pollution have led to a decline in death rates, but the problem persists, and certain regions continue to be disproportionately affected. This is evident in the United States, where about 66 million tons of pollution were emitted into the atmosphere in 2023, contributing to the formation of ozone and particles, as well as visibility impairment. Furthermore, the richest 1% of the global population emits as much planet-heating pollution as two-thirds of humanity, highlighting the inequality in pollution contributions.
| Characteristics | Values |
|---|---|
| Global death rates from air pollution | Death rates from air pollution have nearly halved since 1990. In 2021, 2,000 young children died every day due to air pollution. |
| Air pollution sources | Residential energy for cooking and heating, vehicles, power generation, agriculture/waste incineration, industry, fossil fuels, forest fires, and open fires for cooking. |
| Pollutants | Particulate matter, carbon monoxide, ozone, nitrogen dioxide, sulfur dioxide, and lead. |
| Air pollution impact | Air pollution is one of the leading causes of health issues such as strokes, heart diseases, lung cancer, acute and chronic respiratory diseases, diabetes, and chronic obstructive pulmonary disease (COPD). It also affects biodiversity, ecosystems, and global warming. |
| Air pollution control benefits | Every dollar spent on air pollution control in the USA yields $30 in economic benefits. |
| Air quality standards | Only 9% of countries meet the World Health Organization's (WHO) guidelines for particulate matter pollution (PM2.5). |
| Air quality in the USA | In 2023, about 66 million tons of pollution were emitted into the US atmosphere, and approximately 140 million people lived in counties with pollution levels above the primary NAAQS. |
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What You'll Learn
Fossil fuels and transport
Fossil fuels, such as coal, oil, and gas, have played a dominant role in global energy systems. However, burning them releases carbon dioxide (CO2) and other greenhouse gases, making them the largest driver of global climate change and a significant contributor to air pollution.
Transportation is a major source of carbon pollution, with greenhouse gas emissions from this sector primarily coming from burning fossil fuels like gasoline and diesel. In the United States, transportation accounts for about 28% of total greenhouse gas emissions, making it the largest contributor. Over 94% of the fuel used for transportation is petroleum-based, and the transportation sector has seen the most significant increase in greenhouse gas emissions between 1990 and 2022 compared to other sectors.
Motorised transport on land, sea, and air typically relies on internal combustion engines that run on fossil fuels, and transport accounts for more than a third of CO2 emissions from end-use sectors. To address this, policies are being implemented to encourage the use of less carbon-intensive travel options, such as electric vehicles, renewable fuels, and less carbon-intensive travel options, such as walking, cycling, and public transport.
The richest 1% of the global population produces a disproportionate amount of carbon pollution. In 2019, their emissions were more than all car and road transport emissions, and Oxfam calculates that taxing their incomes could significantly cut emissions and raise funds for the transition to renewable energy.
To summarise, fossil fuels are a major source of pollution, and transportation is a significant contributor to carbon pollution, particularly due to its reliance on fossil fuels. Addressing this issue involves implementing policies that promote the adoption of electric vehicles, renewable fuels, and less carbon-intensive travel options, as well as targeting excessive emissions from the super-rich.
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Industrial facilities
Industrial pollution refers to the contamination of the environment, including air, water, and soil, caused by industrial activities. These activities include manufacturing, processing, and extracting raw materials, which produce waste and emissions harmful to the environment and human health. Industrial facilities emit carcinogens and pollutants that impact air quality, such as PM2.5, silica dust, coal dust, methane, carbon monoxide, sulfur dioxide, and nitrogen oxides. Refineries and steel mills are examples of industrial facilities that emit airborne pollutants.
In Europe, industrial activities have resulted in environmental and health costs, with the largest industrial plants causing about 2% of the EU's GDP in damages in 2021. The EU energy sector, particularly coal power plants, has been a significant contributor to the decline in environmental and health costs, accounting for about 80% of the decrease. Thermal power plants, especially those burning coal, gas, or oil, are the most damaging to health and the environment.
In the United States, industrial pollution has been linked to cancer disparities, with certain demographic groups bearing a heavier burden of carcinogenic pollutants. Industrial activities contribute to greenhouse gas emissions, with the commercial, residential, and industrial sectors significantly increasing emissions when indirect emissions from electricity use are included.
The impact of industrial pollution extends beyond air quality. Water bodies are affected by the discharge of industrial waste, with solid and liquid wastes disrupting marine life and degrading water quality. Soil contamination is also a concern, particularly with the increasing dependence on groundwater for consumption and usage. Additionally, industrial pollution contributes to the degradation of agricultural lands and the corrosion of infrastructure, requiring costly repairs.
To mitigate the effects of industrial pollution, effective waste treatment strategies and stricter regulations are necessary. Reducing emissions and adopting cleaner, more sustainable practices are crucial to minimizing the environmental and health impacts of industrial facilities.
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Residential energy
Household energy emissions contribute around 20% of ambient air pollution globally, but this figure can be much higher locally, depending on the geographic area and season. In some African and Asian countries, cooking with solid fuels can account for 60-80% of total controllable black carbon emissions. Black carbon has a much higher climate warming capacity than carbon dioxide, making it a significant contributor to climate change. Additionally, indoor air pollution has been linked to various adverse health effects, including respiratory infections, heart disease, stroke, and lung cancer. The health burden of household air pollution disproportionately affects women and children, who typically spend more time indoors performing household chores and are more vulnerable to the harmful effects of air pollution.
To address the issue of household air pollution, the WHO has issued guidelines for indoor air quality and household fuel combustion. These guidelines provide recommendations on clean fuels and technologies, such as solar power, electricity, biogas, liquefied petroleum gas (LPG), natural gas, alcohol fuels, and biomass stoves that meet specific emission targets. The adoption of cleaner household energy technologies and fuels can improve air quality, reduce health risks, and contribute to climate change mitigation.
Some strategies to promote the use of clean household energy include providing financial support for the purchase of cleaner technologies and fuels, improving ventilation and housing design, and conducting communication campaigns to encourage the use of clean energy. Additionally, the EPA's Megacities Partnership provides a framework for local and national policymakers to develop and implement comprehensive action plans to address air quality and improve public health in cities. By targeting household energy emissions and promoting sustainable practices, significant reductions in pollution levels and improvements in public health can be achieved.
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Inequality and climate change
While it is difficult to quantify the precise amount of pollution emitted daily, air pollution, in particular, poses a significant threat to both human health and the climate. According to the World Health Organization (WHO), nearly everyone on the planet (99%) breathes air that exceeds the recommended guideline limits and contains high levels of pollutants. This pollution consists of particulate matter, carbon monoxide, ozone, nitrogen dioxide, and sulfur dioxide, with low- and middle-income countries experiencing the highest levels.
The sources of air pollution are varied and context-specific, but major outdoor pollution sources include residential energy for cooking and heating, vehicles, power generation, waste incineration, and industry. Indoor air pollution, which has seen a significant decline in death rates, is caused by the use of polluting open fires or simple stoves fueled by biomass, coal, or kerosene.
Furthermore, climate-fueled disasters have become the primary driver of internal displacement, forcing an estimated 32 million people from their homes in 2022 alone. Hunger is also on the rise due to climate change, and people are losing their livelihoods, homes, and communities due to climate shocks and persistent climate stress. Indigenous peoples, women, and girls are among those at the greatest risk of displacement and face additional challenges, such as increased distances to collect water and fuel and heightened risks of violence and exploitation during extreme weather events.
Addressing inequality and climate change requires a multi-faceted approach. Oxfam proposes a global redistribution of incomes to provide a minimum daily income for those in poverty while reducing global emissions. This involves a swift transition away from fossil fuels, particularly by rich countries that have disproportionately contributed to global warming. New taxes on corporations and the super-rich can fund this transition to renewable energy, prioritizing human and planetary well-being over endless profit and consumption. Additionally, measures must be taken to offset the costs of climate policies on poor and vulnerable countries and communities, ensuring that efforts to reduce emissions align with broader objectives of poverty reduction, job creation, improved air quality, and public health.
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Health impacts
Air pollution is a mix of hazardous substances from both human-made and natural sources. It is a major threat to global health and prosperity and is responsible for more than 6.5 million deaths each year globally. This number has increased over the past two decades.
Air pollution is a combination of outdoor and indoor particulate matter and ozone. It is a risk factor for many of the leading causes of death, including heart disease, stroke, lower respiratory infections, lung cancer, diabetes, and chronic obstructive pulmonary disease (COPD). It also increases the risk of diseases later in life, with children being particularly vulnerable as their bodies and immune systems are still developing.
Pollutants of major public health concern include particulate matter, carbon monoxide, ozone, nitrogen dioxide, and sulfur dioxide. Outdoor and indoor air pollution cause respiratory and other diseases and are important sources of morbidity and mortality. WHO data show that almost the entire global population (99%) breathes air that exceeds WHO guideline limits and contains high levels of pollutants, with low- and middle-income countries suffering the highest exposures.
The health impacts of air pollution are wide-ranging and include coughing, itchy eyes, and causing or worsening breathing and lung diseases, leading to hospitalizations, cancer, or even premature death. Short-term exposure to higher levels of outdoor air pollution is associated with reduced lung function, asthma, cardiac problems, emergency department visits, and hospital admissions. Long-term exposure to air pollution is linked to type 2 diabetes, obesity, systemic inflammation, Alzheimer's disease, and dementia.
The burden of air pollution is greater in low- and middle-income countries due to high indoor pollution rates from solid fuel use for cooking and increased outdoor pollution during industrialization. However, even in high-income countries, disparities exist, with lower-income communities and minority populations disproportionately exposed to air pollution and its adverse health effects.
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Frequently asked questions
It is difficult to quantify the amount of pollution given off every day, but it is clear that human activities, especially the combustion of fossil fuels, are the primary drivers of air pollution.
Greenhouse gas emissions from transportation, industry, commercial and residential activities, agriculture, and power generation are significant contributors to pollution.
Air pollution is a major health risk, causing respiratory and other diseases. It is linked to strokes, heart diseases, lung cancer, and acute and chronic respiratory issues.
Low- and middle-income countries tend to bear a greater burden of air pollution due to indoor pollution from solid fuel use for cooking and increased outdoor pollution during industrialization.
Pollution, particularly the release of greenhouse gases, contributes to climate change, warming the planet and leading to extreme weather events such as floods, heatwaves, and droughts.
