Helena Joyce
The United States faces a range of pollution issues, from air pollution to greenhouse gas emissions. Air pollution, caused by factors such as ozone, particle pollution, and indoor air pollution, poses serious health risks, including triggering asthma attacks and harming lung development in children. The American Lung Association's report highlights that nearly half of Americans live in areas with poor air quality. Additionally, the production of electricity from burning fossil fuels, particularly coal, is a significant contributor to air pollution and global warming. Power plants, especially older ones, are the largest source of carbon dioxide emissions, and states like Texas, Ohio, and Georgia host some of the dirtiest power plants. The transportation sector is also a major emitter of greenhouse gases, with over 94% of fuel used coming from petroleum. While there have been efforts to reduce pollution, such as the Clean Air Act and the Diesel Emissions Reduction Act, the EPA's funding and staffing cuts threaten the progress made.
| Characteristics | Values |
|---|---|
| Primary Source of Pollution | Burning fossil fuels for electricity, heat, and transportation |
| Largest Source of Greenhouse Gas Emissions | Transportation sector (94% of fuel used is petroleum-based) |
| Second Largest Source of Greenhouse Gas Emissions | Electricity end-use |
| Primary Greenhouse Gases | Carbon dioxide (CO2), methane, nitrous oxide, fluorinated gases |
| Power Plants with Highest Emissions | Georgia, Alabama, Indiana, Texas, Michigan, Arizona |
| States with Most CO2 Pollution from Power Plants | Texas, Ohio, Florida, Indiana, Pennsylvania |
| Fuel with Highest Carbon Content | Coal |
| Share of U.S. Electricity from Coal | Just under 50% |
| Share of U.S. CO2 Pollution from Coal | 36% |
| Top Polluting Power Plants | Rush Island (MO), John E. Amos (WV), Jim Bridger (WY), Craig Facility (CO) |
| Non-Power Plant Facilities among Top Polluters | ExxonMobil refinery (TX), U.S. Steel (IN), Cleveland-Cliffs (IN), CF Industries Nitrogen (LA), Galveston Bay Refinery (TX) |
| Indoor Air Pollutants | Kerosene space heaters, cooking, wall paints, second-hand smoke |
| Health Risks of Air Pollution | Asthma attacks, impaired lung development in children, cardiovascular diseases, infections |
| Population Disproportionately Affected by Air Pollution | People of color, low-income communities |
| Key to Reducing Global Warming Pollution | Transition to clean and renewable energy sources |
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What You'll Learn
Fossil fuels and nuclear power
The United States' heavy reliance on fossil fuels and nuclear power has significantly contributed to environmental pollution and global warming. Power plants are the largest source of carbon dioxide (CO2) emissions in the US, with coal-fired plants being the biggest culprit. Coal provides nearly half of America's electricity and has the highest carbon content of any fossil fuel per unit of energy. In 2007, US coal-fired power plants emitted over 80% of CO2 pollution from power plants and 36% of total US CO2 pollution. They also released disproportionate amounts of smog- and soot-forming pollutants, toxic mercury, and other toxic air pollutants.
The aging and inefficient power plants, particularly those built before 1980, produce a disproportionate amount of pollution. Georgia, Alabama, Indiana, Texas, Michigan, and Arizona are home to some of the dirtiest power plants, each emitting over 20 million tons of CO2 pollution in 2007. The continued use and expansion of fossil fuel production have been deemed unlawful, violating the Clean Air Act, which has driven pollution reduction for over 50 years.
Nuclear power, while not a direct source of air pollution or carbon dioxide emissions, has its own environmental impacts. Nuclear power plants generate radioactive waste, including spent nuclear fuel containing carcinogenic radionuclide isotopes. There are three low-level waste disposal sites in the US, located in South Carolina, Utah, and Washington. Additionally, nuclear power plants require uranium mining and refining, which can indirectly contribute to emissions if fossil fuels are used in these processes.
To address the pollution caused by fossil fuels and nuclear power, the US Environmental Protection Agency (EPA) plays a critical role in monitoring and regulating air pollution. However, the EPA has faced staffing and funding cuts, threatening its ability to protect public health. The Clean Air Act has been a key tool in the government's fight against climate change, but the Trump administration sought to overturn scientific findings related to carbon emissions, creating barriers to the transition to clean energy sources.
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Power plants in Georgia, Alabama, Indiana, Texas, Michigan, and Arizona
Power plants are a major source of pollution in the United States, with many states having at least one "super polluter". Here is some information on power plants in Georgia, Alabama, Indiana, Texas, Michigan, and Arizona, and their impact on pollution.
Georgia
Georgia is home to three of the top 100 most polluting power plants in the US. Plant Bowen, a coal-fired plant near Cartersville, topped the list of the dirtiest power plants in the state and ranked 23rd in the country. Plant McDonough, a gas-fired plant near Atlanta, also made the nation's top 100 list. Despite increased renewable energy generation leading to decreased emissions from the power sector, Georgia still has over 3,400 fossil-fuel power plants contributing to climate change.
Alabama
Plant Miller, a coal plant outside Birmingham, has been the top greenhouse gas polluter in the US for nine consecutive years. It sits on a tributary to the Black Warrior River, and its coal ash lagoon discharges toxic contaminants into the groundwater and surface water. Miller's emissions have remained steady while other plants have reduced theirs, and it has been the nation's largest single source of greenhouse gas pollution every year since 2015. Alabama Power has no plans to close the plant, despite its parent company's stated goal of reaching net-zero emissions by 2050.
Indiana
Indiana has been slow to transition away from coal, with more than 90% of the state's electricity generated by coal-fired power as recently as 2009. Indiana now generates 16% of its electricity from natural gas, but coal still dominates. The state has four "super polluters" in its southwestern region, where six coal plants generate 40% of the state's electricity but account for a disproportionate amount of pollution. These six plants accounted for a quarter of Indiana's air emissions reported to the EPA in 2014.
Texas
Texas is home to three of the nation's top ten dirtiest power plants. In 2020, the ten most climate-polluting plants in the state contributed to 40.17% of global warming emissions from the power sector, despite only generating 16.52% of total electricity. Coal-fired power plants make up the majority of the dirtiest power plants in Texas, but methane gas-fired plants are also significant contributors to climate change.
Michigan
The total emissions of Michigan's top ten power plants are 38.9 million metric tons, equivalent to 8.4 million cars on the road for a year. All ten facilities are powered by fossil fuels, with five coal-fired plants and five methane gas-fired plants. Michigan's power plants release greenhouse gases, including carbon dioxide, methane, and nitrous oxide, contributing to global warming.
Arizona
Arizona's top ten power plants produce 30 million metric tons of emissions, the equivalent of 6.5 million cars on the road annually. All ten facilities are powered by fossil fuels, with three primarily coal-fired and seven methane gas-fired plants. Like other states, Arizona's power plants contribute to global warming by releasing greenhouse gases when burning fossil fuels.
Overall, power plants in these states contribute significantly to air pollution and climate change, impacting the health of local communities and the planet.
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Wildfires
The impact of wildfires on air quality can vary due to differences in the quantity and composition of emissions, which are influenced by factors such as fuel type and amount, meteorology, and burning conditions. Wildfire smoke undergoes chemical transformations in the atmosphere, leading to the formation of secondary pollutants like ozone (O3) and secondary organic aerosol (SOA).
Climate change is a key factor in increasing the risk and severity of wildfires in the US, particularly in the western states. Warmer and drier conditions caused by climate change contribute to the spread of insects like the mountain pine beetle, which weaken or kill trees, adding fuel to potential fires. Reduced precipitation and higher temperatures are expected to increase the risk of wildfires in the future.
The frequency, extent, and severity of wildfires have significant impacts on communities, regions, watersheds, and ecosystems. Wildfires can cause extensive damage to homes, infrastructure, and natural resources, resulting in high economic and ecological costs. For example, the 2017 and 2018 wildfires in California and other western states incurred estimated costs of over $40 billion. Additionally, the 2019 wildfires in California and Alaska caused approximately $4.5 billion in damages.
To address the challenges posed by wildfires, communities can utilize tools such as the Climate Mapping for Resilience and Adaptation portal, which provides real-time information on wildfire, drought, flooding, and extreme heat risks across the United States. This information can assist in developing resilience strategies and planning for potential climate risks.
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Transportation
Cars, trucks, ships, trains, and planes all contribute to the high levels of transportation-related pollution. The United States Environmental Protection Agency (EPA) has made reducing diesel emissions from ships, trucks, locomotives, and other diesel engines a top priority. The Diesel Emissions Reduction Act (DERA), administered by the EPA, provides grants to retrofit or replace older diesel engines that have a significant impact on human health. Since 2008, the DERA program has successfully improved air quality. Additionally, the EPA collaborates with local and state partners to reduce emissions from port operations and enhance the efficient transportation of goods.
The transportation sector's reliance on fossil fuels is not unique to this industry in the United States. The country as a whole depends heavily on fossil fuels, particularly coal, for its electricity needs. Coal supplies nearly half of America's electricity and is the dirtiest of all fuels, with the highest carbon content per unit of energy. America's coal-fired power plants emitted more than 80% of CO2 pollution from power plants in 2007, as well as disproportionate amounts of smog- and soot-forming pollutants, toxic mercury, and other toxic air pollutants.
While there has been a recent decline in emissions due to the coronavirus (COVID-19) pandemic's impact on travel, the overall trend in the United States is an increase in greenhouse gas emissions. The transportation sector plays a significant role in this, and efforts to reduce emissions from this sector, such as the work of the EPA and the DERA program, are crucial steps towards improving air quality and mitigating the impacts of global warming.
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Indoor air pollution
Common indoor pollution sources include combustion byproducts such as carbon monoxide, particulate matter, and environmental tobacco smoke. Biological agents like moulds and substances of natural origin, including radon, pet dander, and mould, can also be indoor pollutants. Pesticides, lead, and asbestos are additional concerns. The increased use of synthetic building materials, furnishings, personal care products, and household cleaners has also contributed to higher indoor concentrations of some pollutants.
The health effects of indoor air pollution can vary, with some individuals experiencing immediate reactions, such as asthma symptoms, while others may not exhibit noticeable symptoms until years after exposure or only after prolonged or repeated exposure. Respiratory diseases, heart disease, and cancer are potential long-term health consequences of indoor air pollution exposure, and these can be severely debilitating or even fatal.
It is important for individuals to be aware of the potential risks and take steps to improve indoor air quality, even if symptoms are not apparent. Testing for radon, for example, is recommended as it is the second leading cause of lung cancer, yet it is invisible and odourless.
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Frequently asked questions
The largest source of greenhouse gas emissions in the United States comes from burning fossil fuels for electricity, heat, and transportation. Power plants are the biggest individual contributors to global warming, with coal being the biggest culprit.
Georgia, Alabama, and Indiana are home to the dirtiest power plants. Texas, Ohio, Florida, Indiana, and Pennsylvania emitted the most CO2 pollution from power plants.
Air pollution can trigger asthma attacks, harm lung development in children, and even be deadly. It can also increase the risk of cardiovascular diseases, with indoor air pollution being a significant factor.
The U.S. Environmental Protection Agency (EPA) plays a critical role in monitoring and reducing air pollution. The Clean Air Act has also driven pollution reduction for over 50 years. Additionally, there is a shift towards renewable energy sources, and some power plants are planning to close or convert to cleaner energy sources.
