Meghan Hodges
Pittsburgh, Pennsylvania, is known for its bridges and steel-related production, both of which contribute to higher levels of pollution. In 2024, the American Lung Association's annual State of the Air report ranked the Pittsburgh-New Castle-Weirton metro area among the worst in the nation for year-round particle pollution. While Pittsburgh's air quality has shown improvement, with fewer unhealthy days reported, it continues to receive failing grades. The city's terrain of rolling hills and steep valleys also plays a role in trapping and channelling air pollution. Additionally, Pittsburgh has a history of industrial pollution, with a notable incident in 2021 where thousands of pounds of toxic chemicals were released from a chemical plant, impacting the air quality for residents.
| Characteristics | Values |
|---|---|
| Air pollution | Particle pollution, ozone smog, haze, smoke, haze, and other contaminants |
| US AQI reading | 53 (moderate rating bracket) |
| PM2.5 concentration | Above the World Health Organization's exposure recommendation |
| Vulnerable groups | Elderly, young children, babies, pregnant women |
| Terrain | Tangled rolling hills and steep valleys |
| Water pollution | Sewage-treatment plants cannot handle the volume of stormwater, which is then diverted into rivers |
| Industrial pollution | U.S. Steel's Clairton Coke Works and Edgar Thomson Steel Works |
| Yearly averages | Taken in PM2.5 units |
| American Lung Association ranking | Worst in the nation for year-round particle pollution |
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What You'll Learn
Pittsburgh's terrain and geography trap air pollution
Pittsburgh, Pennsylvania, is known for its rugged terrain of rolling hills and steep valleys. This topography, in combination with its many industrial polluters, has earned it a reputation for poor air quality. The unique landscape of Western Pennsylvania, characterised by its steep valleys and rolling hills, often results in air pollution becoming trapped or channelled in unusual ways. This is due to a phenomenon known as temperature inversion, where cold air becomes trapped below warm air, preventing harmful emissions from dispersing into the wider airshed.
Temperature inversions occur on 47% of all days in a given year in Allegheny County, according to Michael Brown, a meteorologist at the National Weather Service in Pittsburgh. While typically, inversions "burn off" as the midday sun heats the ground, they can sometimes persist for days, keeping harmful emissions close to the ground. This has severe consequences for vulnerable individuals, such as the elderly, young children, babies, and pregnant women. Exposure to high levels of air pollution during pregnancy can lead to premature births, low birth weight, and an increased risk of miscarriage. Young children are also at risk of developing respiratory issues, such as asthma, and skin conditions due to hypersensitivity to chemical pollutants.
The industrial history of Pittsburgh has also played a significant role in its air quality issues. Manufacturers have long been attracted to the flat plains surrounding the Monongahela River, taking advantage of its access to water and transportation via waterways and railroads. Despite decades of deindustrialization, the Mon Valley remains one of the most heavily polluted areas in the country, home to nearly 20 large industrial polluters, including U.S. Steel's Clairton Coke Works and Edgar Thomson Steel Works. The steep terrain of the Mon River Valley further exacerbates the problem, trapping emissions within the valley and resulting in high concentrations of air pollution.
Carnegie Mellon University's Breathe Project has developed maps illustrating heavy concentrations of black carbon settling around Pittsburgh's three main waterways. These maps highlight how roads, factories, and other pollution sources are often nestled within river valleys, with the steep terrain trapping emissions and preventing their dispersal. This unique combination of industrial activity and rugged terrain has earned Pittsburgh a ranking as one of the worst cities in the nation for year-round particle pollution, according to the American Lung Association's 2024 "State of the Air" report. While the report noted an improvement in Pittsburgh's air quality, with the city no longer ranking among the worst 25 metro areas for daily particle pollution, it continues to earn a failing grade, underscoring the urgent need for stronger national limits on ozone pollution.
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The city's industrial past and present
Pittsburgh, a city in Pennsylvania, has a long history of industrial activity that has had a significant impact on the environment and the city's air quality. The city's past and present industrial activities have played a major role in shaping the city and its pollution levels.
Pittsburgh's industrial past can be traced back to the late 18th and early 19th centuries when the city became a major center for steel production. The city's location at the confluence of three rivers made it an ideal spot for the transportation and trading of goods, including coal and iron ore, which are necessary for steel production. As the steel industry boomed, so did the city's population and economic growth. However, this rapid industrialization also led to increased air pollution as the steel mills and factories emitted large amounts of smoke and pollutants into the air. The city became known for its thick smog and was even referred to as "Hell with the lid off" by novelist Henry Miller in the 1940s.
In the mid-20th century, Pittsburgh began to experience a decline in its steel industry as production moved overseas and to other parts of the United States. This period of deindustrialization led to a decrease in air pollution as many of the city's factories closed down. However, the environmental damage had already been done, and the city was left with a legacy of pollution and health issues among its residents. It is estimated that during this industrial peak, the level of pollution in Pittsburgh was so high that it reduced the life expectancy of its residents by an average of 2.4 years.
While Pittsburgh's economy has diversified and moved away from its heavy industrial past, the city still has a significant number of industrial facilities and continues to grapple with the environmental impacts of its past and present industries. Today, Pittsburgh's main industrial sectors include energy, advanced manufacturing, and biotechnology. While these industries are less polluting than the city's former steel mills, they still contribute to air pollution and other environmental issues.
Current efforts to improve air quality and reduce pollution in Pittsburgh involve implementing new technologies and policies. For example, the city has adopted an air quality action plan that outlines strategies to reduce emissions and improve air quality. Additionally, local organizations and initiatives are working to promote sustainable practices and raise awareness about the importance of clean air and a healthy environment. Pittsburgh also has a real-time air quality index that provides up-to-date information on the city's air pollution levels, allowing residents to take necessary precautions when pollution levels are high.
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The impact on vulnerable groups
Pittsburgh has been ranked among the 25 regions in the US with the worst air pollution. In 2024, the Pittsburgh-New Castle-Weirton, PA-OH-WV metro area was named one of the worst cities in the nation for year-round particle pollution. The region is home to numerous polluting industries, with an estimated 80% of toxic air pollutants in Allegheny County coming from just ten industrial sites.
Vulnerable groups in Pittsburgh are especially susceptible to the adverse health effects of air pollution. These groups include individuals with pre-existing health issues, compromised immune systems, and an overall poor level of health. Additionally, the elderly, young children, babies, and pregnant women are considered vulnerable.
Pregnant women are at a heightened risk due to the detrimental effects of high pollution levels on the health of unborn children. The consequences can include premature births, low birth weight, and an increased risk of miscarriage, leading to a higher infant mortality rate. Young children are also highly susceptible as they go through their formative years, and any damage to their lungs or skin can have lifelong effects, such as the development of asthma that may persist into adulthood.
On days with high pollution levels, vulnerable individuals should take preventative measures such as avoiding outdoor activity and strenuous exercise. Wearing particle-filtering masks, sealing off windows and doors, and using indoor air purifiers can also help minimize the impact of air pollution on their health.
The unique terrain of Western Pennsylvania, characterized by rolling hills and steep valleys, contributes to the trapping and channelling of air pollution in unusual ways, further exacerbating the issue.
Addressing air pollution in Pittsburgh is crucial, especially to protect the health and well-being of vulnerable groups within the community.
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Pittsburgh's air quality compared to other cities
Pittsburgh's air quality has been described as moderate by the Air Quality Index (AQI), with a US AQI reading of 53 in late June 2021. This indicates that the air in Pittsburgh has higher levels of smoke, haze, and other contaminants compared to days with lower AQI readings.
In 2020, the yearly average of Pittsburgh's PM2.5 was 10.1 μg/m³, which placed the city in the 'good' air quality rating bracket. This placed Pittsburgh in 2509th place out of all ranked cities worldwide and 12th in Pennsylvania, just behind Chester and Clairton.
However, according to a 2023 report, the Pittsburgh metropolitan area ranked 20th out of 223 metro areas for the worst short-term particle pollution, up from 22nd place the previous year. The area also maintained its ranking as the 14th worst city for annual particle pollution out of 200 metro areas. The Pittsburgh-New Castle-Weirton, PA-OH-WV metro area ranked among the worst polluted cities in the country for both annual and 24-hour particle pollution, with the Pittsburgh metro area experiencing more short-term spikes in particle pollution compared to the previous year.
In the 2024 State of the Air report, Pittsburgh was not among the 25 cities most polluted by particulate matter for the first time, showing some improvement in air quality. The Pittsburgh region earned a grade D for ozone smog, improving from the previous year when it was ranked the 50th worst metro area for ozone smog.
Compared to other cities, Pittsburgh's air quality is generally considered to be worse than many other American cities. The greater Pittsburgh metropolitan area is among the 25 worst regions in the country for air quality, according to the American Lung Association's "State of the Air" report. This report found that 46% of Americans are living in places with failing grades for unhealthy levels of ozone or particulate pollution.
However, some sources suggest that while Pittsburgh's air quality could be improved, it is comparable to other similar cities in America. Additionally, the city's ranking has improved in recent years, indicating that efforts to reduce pollution may be having a positive impact.
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Historical views on Pittsburgh's pollution
Pittsburgh, Pennsylvania, has a long and complex history with pollution, and its journey towards cleaner air and water is a story of both struggle and success. The city's past is deeply intertwined with heavy industry, and its reputation as a polluted industrial centre is not unfounded.
Since the late 1700s, Pittsburgh has been a centre of steel production and other heavy industries, which have had a significant impact on the local environment. The city's location in a valley, with limited air movement, meant that pollution from these industries tended to linger. Smoke from coal-fired furnaces and emissions from steel mills blanketed the sky, leading to a pervasive and persistent layer of smog. This earned Pittsburgh the nickname of "Hell with the Lid Off." The air was often thick with soot and ash, making breathing difficult and leading to a range of health issues for residents. Visible, thick smog was a common occurrence, and the air quality was so poor that streetlights would remain on during the day to provide visibility.
In the late 19th and early 20th centuries, little regulation existed to control industrial emissions, and the health impacts on residents were severe. Respiratory issues, including asthma and emphysema, were common, and the city had high rates of lung disease and cancer. The air pollution was so severe that it damaged buildings and infrastructure, and the acid rain that resulted from the pollution also took a toll on the region's vegetation and water bodies. The Monongahela River, which runs through Pittsburgh, was so polluted with industrial waste that it was once declared "biologically dead."
However, Pittsburgh's residents did not accept their situation passively. Community activism played a crucial role in demanding change and pushing for environmental regulations. In the 1940s, the Smoke Control Commission was established to address the city's air quality issues, and this led to the implementation of some of the nation's first air pollution controls. The city became a pioneer in pollution control efforts, with the development of innovative technologies and policies to improve air quality. For example, the city mandated the use of "smog dogs," which were vehicles equipped with air quality monitoring equipment to help identify pollution sources.
Despite these efforts, it was not until the passage of federal legislation in the 1960s and 1970s, including the Clean Air Act and the Clean Water Act, that significant progress was made. These laws provided a framework for regulating industrial emissions and set standards for air and water quality. As a result, Pittsburgh's air quality gradually improved, and the city began to transform itself, diversifying its economy away from heavy industry.
Today, Pittsburgh continues to grapple with the legacy of its industrial past while also embracing new, cleaner industries. While the city has made remarkable strides, the work is ongoing to ensure a sustainable and healthy future for its residents, showing that environmental improvement is a continuous journey.
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Frequently asked questions
Pittsburgh has been ranked among the worst cities in the nation for year-round particle pollution.
Pittsburgh's large number of steel plants and other manufacturing facilities are a significant source of pollution. In addition, the city's terrain can trap and channel pollution in certain areas.
The high levels of air pollution in Pittsburgh can have adverse health effects, particularly on vulnerable groups such as the elderly, young children, babies, and pregnant women.
The EPA has recently finalized new air pollution rules to help clean up particle pollution and address climate change. The Lung Association is also urging the EPA to set stronger national limits on ozone pollution.
Yes, Pittsburgh has a long history of pollution, dating back to its industrialization. In the 1940s, the pollution was so bad that city lights had to be turned on during the daytime.
