Meghan Hodges
The COVID-19 pandemic and its associated lockdowns have had a significant impact on pollution levels globally. While the pandemic has exploited existing environmental problems, the shutdowns have resulted in cleaner air and water. For example, in China, the coronavirus shutdowns likely saved between 53,000 and 77,000 lives, far more than the direct toll of the virus. However, as industries restart and people return to their pre-pandemic habits, emissions are expected to rebound and may even surpass previous levels. Aside from the pandemic, various efforts have been made to address pollution, such as the Clean Air Act in the US, which has achieved dramatic reductions in air pollution and protected public health. Despite these efforts, pollution remains a pervasive issue, with indoor air pollution, vehicle emissions, and industrial activities continuing to contribute to environmental damage and adverse health outcomes. Additionally, the cleanup of air pollution in certain regions, such as China, has led to unexpected consequences, including atmospheric heating and ocean warming. To address pollution, individuals can take actions such as reducing vehicle usage, choosing energy-efficient appliances, and limiting backyard fires.
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What You'll Learn
Lockdowns and coronavirus shutdowns improved air quality
The COVID-19 pandemic lockdowns and quarantines have led to significant industrial slowdowns among the world's major emitters of air pollutants. The air quality in China improved in 2020 due to COVID-19-related shutdowns and tougher industrial controls. According to government data, the average concentration of PM2.5 in 337 cities fell by 8.3% to 33 micrograms per cubic meter over the year. The region comprising Beijing, Tianjin, and Hebei saw average PM2.5 levels drop by 10.5% to 51 micrograms per cubic meter.
Similarly, New Jersey experienced improved air quality during the COVID-19 shutdowns. Three of the most congested areas in the state saw nitrogen oxide and particulate matter drop by as much as 49% in March and April, according to DEP data. The air quality continued to be good in May, with only one day of moderate particulate levels in North Jersey and New York City.
In the United States, researchers from Columbia University conducted air quality monitoring research in New York City. The preliminary data indicated that CO and CO2 emissions dropped by approximately 50% and 10-35%, respectively, due to reduced vehicle traffic during the COVID-19 shutdown.
While the pandemic-driven clearing of the air is expected to be short-lived, the temporary experience of cleaner air may offer lessons for creating a better post-pandemic world.
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The Clean Air Act has reduced pollution and improved health
The Clean Air Act, established in 1970, has been instrumental in reducing pollution and improving public health in the United States. The Act was designed to address a variety of air pollution issues and tackle emerging threats. Over the years, it has proven effective in cutting down pollution while promoting economic growth.
One of the key achievements of the Clean Air Act has been the reduction of particulate air pollution. By 1980, control of industrial emissions had resulted in a 50% decrease in particulate emissions or a 20% decrease in ambient PM concentrations nationwide. Today, the PM2.5 pollution that Americans are exposed to is significantly lower than in 1970, with overall pollution levels dropping by 62-64.9%. This has led to notable health benefits, including increased life expectancy. It is estimated that reductions in particulate air pollution alone have added 1.4 to 1.5 years to the average American's life expectancy since 1970.
The Clean Air Act has also targeted specific pollutants, leading to significant improvements in air quality. Between 1990 and 2020, national concentrations of several pollutants decreased substantially: carbon monoxide by 73%, lead by 86% (from 2010), nitrogen dioxide by 61%, ozone by 25%, 24-hour coarse particle concentrations by 26%, annual fine particles by 41% (from 2000), and sulfur dioxide by 91%. These reductions have enabled many areas to meet national air quality standards, ensuring a healthier environment for Americans.
The Clean Air Act has prompted the deployment of clean technologies and innovations that reduce emissions and control costs. For instance, new cars, trucks, and non-road engines now use state-of-the-art emission control technologies. Additionally, power plants have made significant strides in cutting emissions that contribute to acid rain and harm public health. The Act has also facilitated the implementation of state emission control measures and national emissions standards, contributing to overall air quality improvements.
While the Clean Air Act has made considerable progress in reducing pollution and improving health, air pollution remains a concern. The COVID-19 pandemic and its associated lockdowns temporarily improved air quality globally, but emissions have rebounded as economies recover. Additionally, indoor air pollution, which is not regulated under the Clean Air Act, continues to pose health risks. Nevertheless, the Clean Air Act has played a pivotal role in reducing pollution, protecting public health, and fostering economic growth in the United States.
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Air pollution is linked to premature deaths and health issues
The COVID-19 pandemic and its associated lockdowns have had a significant impact on air pollution levels. While the cleaner air during lockdowns has been a welcome respite, it is likely to be short-lived as emissions return to pre-coronavirus levels, or even surpass them. The pandemic has highlighted the urgent need to address air pollution, which is linked to premature deaths and various health issues.
Air pollution is a critical environmental health problem, causing approximately 4.2 million premature deaths worldwide each year. This issue disproportionately affects those in low- and middle-income countries, with 89% of premature deaths occurring in these regions. The primary causes of outdoor air pollution include transport, industry, power generation, and municipal waste management. Fine particles (PM 2.5) from factories, power plants, and car exhaust are a significant contributor to air pollution, posing a particular threat to those over 85 years old, females, non-white individuals, and the economically disadvantaged.
The health consequences of air pollution are severe, with poor air quality causing respiratory and cardiovascular issues, as well as cancers. Studies have found a direct correlation between air pollution levels and mortality rates, with even short-term exposure to pollutants increasing the risk of premature death. The Clean Air Act in the United States has achieved dramatic reductions in air pollution, saving hundreds of thousands of lives annually. Additionally, actions to protect the ozone layer have prevented millions of cases of skin cancer and cataracts.
Transitioning from fossil fuels to renewable energy sources is crucial to reducing air pollution-related deaths and health issues. Fossil fuel combustion is responsible for about one-fifth of global deaths, with particulate matter causing respiratory infections and cardiovascular and respiratory diseases. Implementing cleaner technologies and stricter emission standards can significantly reduce air pollution and its associated health risks, protecting public health while enabling economic growth.
Addressing air pollution requires concerted efforts from policymakers and stakeholders in sectors such as energy, transport, waste management, and urban planning. By transitioning to cleaner energy sources and implementing regulations, we can reduce emissions, improve air quality, and ultimately protect public health and save lives.
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Climate change and ocean warming are impacted by pollution cleanups
The COVID-19 pandemic caused a temporary reduction in air pollution as industries shut down and fewer people commuted to work. In China, for example, the drop in pollution during the pandemic likely saved between 53,000 and 77,000 lives—a figure that is many times higher than the direct death toll of the virus. Similarly, the aggressive measures taken to clean the air in Beijing for the 2008 Olympics led to an 8% drop in the overall death rate.
However, the cleanups of air pollution in certain regions can have unintended consequences for climate change and ocean warming. For instance, researchers have found that the decline in smog particles from China's air cleanups caused extreme heat waves in the Pacific. This is because smog particles, known as aerosols, shield the planet from the sun's rays, and their reduction can accelerate warming. The cleanup of China's air pollution has caused "The Blob", a vast expanse of ocean from Alaska to California that periodically warms by up to 4 degrees Celsius, decimating fish stocks, starving seabirds, creating blooms of toxic algae, preventing salmon from returning to rivers, displacing sea lions, and forcing whales into shipping lanes to find food.
While pollution cleanups are essential for public health, the complex interplay between various factors in the atmosphere and oceans can lead to unexpected outcomes. The reduction of aerosols in the atmosphere through pollution cleanups can remove their cooling effect, leading to differential warming that can destabilize atmospheric circulation patterns. This, in turn, can trigger changes in local atmospheric circulation, resulting in more rainfall in some regions.
The impact of pollution cleanups on ocean warming and climate change highlights the intricate balance of our planet's systems. As we address one environmental issue, such as air pollution, it is crucial to consider the potential consequences for other interconnected issues, such as ocean health and climate change. To effectively tackle these complex challenges, a holistic approach that takes into account the broader ecological context is necessary.
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Individuals and businesses can reduce air pollution
The COVID-19 pandemic and its associated lockdowns temporarily cleaned the air, but emissions are likely to return to their previous levels as industries start up again. However, the brief respite from pollution may offer lessons for the future. For instance, the US EPA has taken steps to reduce harmful greenhouse gas pollution, particularly from motor vehicles, which were responsible for over a quarter of US greenhouse gas emissions in 2010. The EPA has also set standards for heavy-duty trucks and buses, and worked with states to permit greenhouse gas emissions from large new and modified stationary sources.
In addition to the actions of governments and other official bodies, individuals and businesses can also play a role in reducing air pollution. Here are some ways in which they can do so:
Individuals
- Limit backyard fires in urban areas, as the smoke can cause unhealthy conditions for people with asthma and other lung conditions.
- Use hand-powered or electric lawn care equipment instead of gas-powered lawnmowers and leaf or snow blowers, which often lack pollution control devices.
- Choose energy-efficient appliances and heating systems, and turn off electrical appliances when they are not in use.
- Plant and care for trees, as they filter pollutants and absorb carbon dioxide, releasing oxygen into the atmosphere.
Businesses
- Comply with environmental rules, reduce waste and emissions, and reduce regulatory obligations with the help of initiatives such as the Small Business Environmental Assistance Program in Minnesota.
- Direct local businesses and city offices toward programs that can help them become more sustainable, such as GreenStep Cities, which educates residents on best practices.
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Frequently asked questions
The health benefits of pollution cleanup are significant. The Clean Air Act in the US has prompted the deployment of clean technologies, which have helped to reduce emissions and control costs. For every dollar spent to reduce pollution, Americans get $3-9 in health benefits. The Clean Air Mercury Rule (CAMR) and the Cross-State Air Pollution Rule (CSAPR) are estimated to prevent 11,000 premature deaths, 4,700 heart attacks, and 130,000 asthma attacks annually.
The pandemic has temporarily cleaned the skies, with shutdowns likely saving between 53,000 and 77,000 lives in China, many times more than the direct toll of the virus. However, this is expected to be short-lived as emissions will likely return to their usual levels, if not surpass them, as industries restart.
Pollution cleanup has positive environmental impacts, such as improving air quality and reducing haze in national parks. Additionally, actions to protect the ozone layer are saving millions of people from skin cancers and cataracts.
To reduce air pollution, power companies, industries, and vehicle manufacturers are required to filter particulates and either burn low-sulfur fuel or fit equipment to strip SO2 from stack emissions. New plants and factories must also install modern pollution control technology, and new vehicles use state-of-the-art emission control technologies.
While pollution cleanup has positive health and environmental benefits, it can also have unintended consequences. For example, the reduction of smog particles in China's air cleanup led to extreme heat waves in the Pacific by removing the shielding effect of aerosols from the sun's rays. This highlights the complexity of environmental interventions and the need for careful consideration of potential impacts.
