Greta Jimenez
Air pollution is a pressing issue that poses a significant threat to human health, the environment, and the economy. It is caused by various sources, including the combustion of fossil fuels, industrial activities, and household combustion devices, contributing to both indoor and outdoor air pollution. While it is challenging to quantify the exact decrease in pollution levels, several factors indicate that pollution has decreased to some extent globally. For instance, since 1990, death rates from total air pollution have nearly halved, primarily due to improvements in indoor air pollution. Additionally, certain countries and regions have made notable progress in reducing pollution. China, for example, has cut air pollution by around half since 2014, while the World Bank has supported projects in Mexico and China, contributing to significant reductions in particulate matter pollution. Furthermore, the COVID-19 pandemic and associated lockdowns resulted in significant reductions in nitrogen dioxide concentrations globally, providing a unique perspective on the impact of human activity on pollution levels.
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What You'll Learn
Vehicle emissions
While newer vehicles are designed to emit less pollution due to stronger fuel economy standards, the growing popularity of large, fuel-intensive vehicles like SUVs and pickup trucks offsets some of the progress made. Additionally, the overall number of miles driven has increased, resulting in a higher total amount of gasoline burned.
However, there is a positive trend in the reduction of vehicle emissions. A study by Harvard University found that as emissions decreased over a decade, the number of deaths attributable to air pollution dropped by thousands, yielding significant societal benefits. This is due in part to federal air pollution regulations and technological innovations by car manufacturers. For example, electric vehicles are becoming increasingly popular, with sales tripling between 2020 and 2021.
To further reduce emissions, various strategies are being implemented. The European Union, for instance, has introduced new CO2 emission targets and plans to ban the sale of new petrol and diesel cars by 2035. Additionally, there is a push for car sharing, public transportation, and the use of electric vehicles, all of which can contribute to lowering emissions.
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Carbon dioxide emissions
Carbon dioxide (CO2) is the principal greenhouse gas and is vital for life on Earth. Plants rely on it to grow, and animals depend on these plants for survival. However, burning fossil fuels releases far more carbon dioxide than the planet can handle. The Earth's land and oceans act as giant sponges, absorbing much of the CO2 in the atmosphere. However, the scale of emissions has overwhelmed these natural systems.
CO2 emissions have been decreasing in the UK, Japan, and the US. This is largely due to stronger fuel economy standards, which have helped lower CO₂ emissions per mile. However, the growing popularity of gas-guzzling SUVs and pickup trucks, which deliver poor mileage, offsets much of this progress. Additionally, Americans are driving more miles than ever, and the amount of gasoline burned has not decreased. While the COVID-19 pandemic temporarily reduced driving and gasoline use, those declines were short-lived. Vehicle miles traveled (VMT) and gasoline consumption have since surged to near-record highs.
On a global scale, carbon dioxide emissions remain at record levels, with an estimated 37.4 billion tons emitted in 2024. The highest annual total ever was in 2019, with 40.9 GtCO2 emitted. While there was a projected decrease in emissions in 2020 due to the COVID-19 lockdowns, emissions rose again in 2022, with a projected total of 40.6 GtCO2. This slight decrease from 2019 levels is still far from the rapid decline needed to limit global warming. If emissions continue at this rate, there is a 50% chance that global warming of 1.5°C will be exceeded in nine years.
To reach zero CO2 emissions by 2050, a decrease of about 1.4 GtCO2 per year is needed. While the long-term rate of increasing fossil emissions has slowed, the total amount of carbon dioxide in the atmosphere continues to rise. This is due to human activities that pump greenhouse gases into the air faster than natural sinks can remove them. As a result, atmospheric carbon dioxide levels are higher than at any point in human history. The last time levels were this high was roughly 3 million years ago, during the Mid-Pliocene Warm Period, when global temperatures were significantly warmer than in pre-industrial times.
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Air pollution from wildfires
Wildfires are unplanned fires that burn in natural areas such as forests, grasslands, or prairies. They are often caused by human activity or natural phenomena like lightning, and they contribute significantly to air pollution. According to the Clean Air Fund, wildfires are one of the largest sources of black carbon, a super pollutant that has severe impacts on the climate and human health.
Black carbon released by wildfires intensifies heatwaves, alters weather patterns, and accelerates the melting of ice and snow. For example, black carbon from Amazonian fires was estimated to increase glacier melting by 3-4%. Wildfires also release other pollutants such as carbon monoxide, nitrogen oxides, and particulate matter, which combine with existing air pollution, exacerbating their harmful effects. The smoke from wildfires contains hazardous air pollutants like PM2.5, NO2, ozone, aromatic hydrocarbons, and lead, which can cause eye and respiratory issues, especially in children and the elderly.
The relationship between wildfires, air pollution, and climate change forms a vicious cycle. Climate change leads to warmer temperatures and drier conditions, extending the fire season and increasing the frequency and intensity of wildfires. In turn, burning trees release carbon and particulate matter, contributing to air pollution and further fueling climate change. This cycle poses a significant threat to people, animals, and the planet.
To break this cycle, governments and policymakers must address the interconnectedness between climate change, air pollution, and wildfires. By focusing on preventing and reducing super pollutants like black carbon, they can combat both the climate crisis and the harmful effects of air pollution on human health and the environment. Additionally, communities, builders, homeowners, and forest managers can implement measures such as smart zoning rules, increasing space between structures and nearby vegetation, incorporating fire-resistant design features, and developing recovery plans to reduce the likelihood and impacts of wildfires.
While there has been progress in improving air quality in certain regions, air pollution remains a critical issue globally. It contributes to one in ten deaths worldwide and is a leading risk factor for various diseases, including heart disease, stroke, lower respiratory infections, lung cancer, diabetes, and chronic obstructive pulmonary disease (COPD). Therefore, addressing air pollution from wildfires is crucial for protecting public health and mitigating the impacts of climate change.
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Inequalities in pollution exposure
While pollution levels have decreased in some countries, inequalities in pollution exposure persist, disproportionately affecting vulnerable communities.
In the United States, Black individuals encounter higher levels of pollution and face increased susceptibility to its adverse health effects due to systemic factors such as poverty, limited access to healthcare, and residential segregation. A Stanford University study found that from 1990 to 2016, Black Americans experienced the highest mortality rates from fine particulate matter air pollution (PM2.5), with a decline in the PM2.5-attributable mortality rate from 350 deaths per 100,000 people in 1990 to 50 deaths per 100,000 people in 2016. While progress has been made, disparities remain, as Black mortality rates remain the highest among all racial groups.
Research from New Zealand, Asia, and Africa also reveals similar patterns, with low-income and deprived neighborhoods bearing the brunt of higher concentrations of particulate matter pollution (PM10 and PM2.5). A study from Ghana found that community socioeconomic status was inversely associated with PM2.5 and PM10 exposure, indicating that lower socioeconomic statuses were linked to increased pollution exposure.
Socioeconomic status plays a significant role in pollution exposure and health outcomes. Individuals and communities with lower socioeconomic statuses often face higher exposure to pollutants and experience greater health impacts. This inequality is evident in the United Kingdom, where social gradients in health reveal that environmental inequality leads to the loss of between 1.3 and 2.5 million years of life due to health inequalities.
Additionally, pollution sources tend to be located near disadvantaged communities, further exacerbating the exposure to harmful pollutants for these vulnerable groups. The concept of environmental inequality underscores the disparities in pollution exposure, highlighting how socioeconomic deprivation can lead to impaired health and increased susceptibility to negative health effects of air pollution.
While overall pollution levels may have decreased in certain countries, addressing these persistent inequalities in pollution exposure is crucial to ensuring environmental justice and equitable health outcomes for all communities.
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Sulphur dioxide emissions
Sulphur dioxide (SO2) is a chemical that is released as a byproduct of burning fossil fuels. It is also emitted by erupting volcanoes and formed through industrial processes, such as extracting metal from ore. SO2 emissions contribute to air pollution and have detrimental effects on both the environment and human health.
SO2 emissions have decreased globally over the last three to four decades. However, this reduction has not been uniform across all regions. The United States, the United Kingdom, and Japan have witnessed declines in their absolute emissions, including SO2. In contrast, countries like China and India, with lower per-capita CO2 emissions, have the potential to significantly impact future pollution levels as their economic development progresses.
The largest sources of SO2 emissions are power plants and industrial facilities that burn fossil fuels. Other sources include industrial processes, natural sources like volcanoes, and vehicles that burn fuel with a high sulfur content, such as diesel engines. SO2 emissions from diesel vehicles were once a significant contributor, but federal regulations to reduce sulfur content in diesel fuels have successfully lowered these emissions.
The adverse effects of SO2 on human health and the environment have prompted governments and organizations to implement measures to reduce SO2 emissions. The U.S. Environmental Protection Agency (EPA), for example, has established national and regional rules to decrease SO2 emissions and other pollutants that form sulfur oxides (SOx). These regulations aim to assist state and local governments in achieving the EPA's air quality standards. Similarly, the Queensland Government in Australia has set objectives for sulfur dioxide emissions, aiming for 0.075 parts per million (ppm) for a 1-hour exposure period, starting from January 1, 2025.
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Frequently asked questions
According to a study by Stanford University, there has been enormous progress from 1990 to 2016 in reducing PM2.5 pollution. In 1990, 85.9% of the US population was exposed to average PM2.5 levels above 12 micrograms per cubic meter. By 2016, this had fallen to just 0.9% of the population. However, it is important to note that air pollution remains a major problem, especially in low- and middle-income countries, where over 90% of all deaths attributable to air pollution from wildfires occur.
Several factors contribute to the reduction of pollution, including legislation such as the Clean Air Act, international cooperation, and targeted action. For example, during the COVID-19 pandemic, restrictions led to a decrease in air pollution, particularly in NO2 emissions from road transport. Additionally, the development of stronger fuel economy standards has helped lower CO2 emissions per mile for modern vehicles.
Pollution affects different communities disproportionately. For example, a Stanford University study found that Black Americans have had the highest proportion of deaths from fine particulate matter air pollution (PM2.5) compared to other racial or demographic subgroups from 1990 to 2016. Additionally, low- and middle-income countries bear the brunt of deaths attributable to air pollution from wildfires, with major hotspots in Southeast Asia, South Asia, East Asia, and Sub-Saharan Africa.
