Greta Jimenez
Chicago, the third most populous city in the United States, has a long history of unhealthy air pollution. In 2024, it was ranked the seventh most polluted major US city, down from second place in 2023. The city's major sources of pollution include transportation, daily emissions from residents, coal-fired power plants, diesel emissions, and industrial activities. Neighborhoods along major interstate highways, such as I-290, I-90, and I-94, experience higher levels of pollution, particularly nitrogen dioxide and particulate matter. Additionally, areas near Lake Michigan are susceptible to ground-level ozone pollution.
| Characteristics | Values |
|---|---|
| Air Quality Index (AQI) in 2019 | 52 ("moderate") |
| Main pollutants | Fine particulate matter (PM2.5) and ozone |
| PM2.5 emissions sources | Diesel transport, passenger vehicles, industry, and winter wood burning |
| Areas with high levels of nitrogen dioxide and particulate matter | Neighborhoods along I-290, I-90, and I-94 |
| Areas with high levels of ground-level ozone pollution | Neighborhoods abutting Lake Michigan |
| Chicago's ranking in 2024 as most polluted US city | 7th |
| Average annual concentration of small particulate matter in 2024 | 8.4 micrograms per cubic meter of air |
| Chicago's ranking in 2019 as most polluted US city | 18th |
| Chicago's ranking in 2018 as most polluted US city | 22nd |
| Average number of unhealthy ozone days between 2015-2017 | 14 |
| Average number of unhealthy ozone days between 2014-2017 | 9.8 |
| Sources of air pollution in Chicago | Transportation, daily emissions from residents, industrial areas, and temperature inversions |
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Transportation
Chicago's heavy traffic is a significant contributor to its poor air quality. Tens of thousands of diesel trucks travel in and out of the city's industrial corridors daily, emitting gases and polluting particles that affect the health of residents, especially children, the elderly, and those with pre-existing health conditions. The city's public transportation system also contributes to pollution, with older diesel-fuel buses and trains still in operation.
The impact of transportation pollution varies across Chicago's neighbourhoods. Areas along major interstate highways, such as I-290, I-90, and I-94, experience higher concentrations of nitrogen dioxide and particulate matter. Neighbourhoods near Lake Michigan, including Lincoln Park, Lake View, Uptown, and Rogers Park, are also affected by ground-level ozone pollution due to temperature inversions caused by the lake's cool air being trapped by warmer air above.
The Chicago Department of Public Health has recognised the impact of transportation on air pollution and is working to control emissions. While direct regulation of the auto industry is challenging, the department focuses on quality zoning, fleet electrification, and equitable access to electric vehicles. Additionally, transportation companies, such as CTA and Metra, are transitioning to electric buses and locomotives, contributing to more sustainable transportation in the city.
To address the inequities in pollution exposure, local and state governments should actively involve impacted communities when evaluating industrial projects that might increase freight pollution. Furthermore, Illinois should prioritise passing the Clean Energy Jobs Act (CEJA) to incentivise electric vehicle charging, especially for medium- and heavy-duty vehicles, to reduce emissions and improve air quality in communities burdened by high traffic.
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Industrial pollution
Chicago has a long history of industrial pollution, dating back to the city's industrialization in the late nineteenth century. During this period, Chicago relied heavily on dirty coal, which was used to heat buildings, power engines, and run steel mills. The soot produced by burning this coal covered the city in a toxic cloud, leading to increased health issues for residents, including pneumonia, asthma, and heart and lung diseases.
While coal usage has declined since World War II, and the establishment of the Department of Air Pollution Control in 1959 has helped regulate emissions, industrial pollution remains a significant issue in Chicago. The city is a major hub for transportation, with numerous federal highways and a busy airport, leading to high levels of transport emissions. In addition, Chicago is home to several industrial corridors, with tens of thousands of diesel trucks travelling through them daily, contributing to particle pollution.
Certain neighbourhoods in Chicago, such as those along major interstate highways or those abutting Lake Michigan, experience significantly higher levels of pollution. These areas are exposed to higher concentrations of nitrogen dioxide and particulate matter, as well as ground-level ozone. The impact of industry on these neighbourhoods is evident, with a stretch of busy roads in Austin, for example, lacking trees and greenspace, and a predominantly Mexican community experiencing some of the highest pollution levels in the city due to nearby industrial areas.
The city has recognized the issue of industrial pollution and is studying the impact of truck traffic on Southwest industrial corridors. However, the sensors used to collect data have been criticized for being largely placed on bus stops, which may not capture the full extent of pollution in industrial areas.
Overall, Chicago's industrial pollution has a long history, and while efforts have been made to regulate emissions, it remains a significant contributor to the city's poor air quality, particularly in specific neighbourhoods.
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Coal usage
Chicago has a long history of air pollution, which dates back to the city's industrialization in the late nineteenth century. During this period, the city relied on coal to heat buildings, power engines, and run steel mills. The burning of this coal produced a dense toxic cloud of soot, which led to an increase in instances of pneumonia, asthma, and heart and lung diseases.
As early as 1881, regulations were put in place to combat the air pollution problem. However, it wasn't until after World War II, when coal usage began to decline, that significant reductions in pollution were realized. Chicago established the Department of Air Pollution Control in 1959 to investigate and regulate emission sources.
Chicago's air pollution has historically been attributed to coal-fired power plants. The coal-fired power plants, along with old diesel engines, have contributed significantly to the city's poor air quality. The soot and tiny particles released from burning coal are small enough to lodge deep in the lungs, triggering asthma attacks, heart attacks, and strokes, and can even be lethal.
In recent years, however, transport emissions have overtaken coal as the city's largest emission source. Temperature inversions, caused by a layer of warm air trapping cooler air from Lake Michigan underneath, can further worsen air quality by preventing the dispersal of pollutants. Despite this, the clean-up of coal-fired power plants has played a role in reducing year-round particle pollution in Chicago, as reported in 2019.
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Wildfires
Chicago, the third most populous city in the United States, has a long history of poor air quality, dating back to the city's industrialization in the late nineteenth century. While coal usage was a major contributor to Chicago's air pollution in the past, the city's air quality in recent years has been impacted by other sources, including transportation emissions, industrial activities, and, increasingly, wildfires.
The impact of wildfires on Chicago's air quality is influenced by various factors, including wind patterns and the size and proximity of the fire. For example, a smaller wildfire that is closer to the city may have a more significant impact on air quality than a larger fire that is farther away and blowing in a different direction. Northern winds have been known to blow smoke from wildfires in central Canada down to Chicago, leading to poor air quality and health risks for vulnerable individuals.
The smoke from wildfires contains microscopic contaminants known as particle pollution, or PM2.5. These fine inhalable particles, with diameters of 2.5 micrometers or less, can be embedded deep in the human lungs and pose health risks, especially to children, the elderly, and people with respiratory or cardiovascular disorders. During periods of high particle pollution, vulnerable individuals may experience symptoms such as wheezing, coughing, a fast heartbeat, fatigue, chest pain, and shortness of breath.
To address the health risks associated with wildfire smoke, government agencies, such as the Illinois Environmental Protection Agency, issue air quality alerts and action days to warn vulnerable populations and recommend precautionary measures. These may include rescheduling outdoor activities, moving activities indoors, and paying close attention to symptoms for those with asthma or heart disease.
While wildfires are a natural and inevitable occurrence, the increasing frequency and intensity of wildfires driven by climate change are expected to exacerbate the problem of air pollution in Chicago and other major cities. Experts predict that climate-driven fires may become the new normal, highlighting the urgent need for preparedness and mitigation strategies to minimize the impact on human health and the environment.
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Temperature inversions
Chicago's location on the shore of Lake Michigan makes the city prone to temperature inversions, specifically cool air inversions and marine inversions. Temperature inversions occur when a layer of warm air sits on top of a layer of cooler air, trapping it and preventing pollution from dispersing. This phenomenon is not uncommon during the summer when cooler air from Lake Michigan is blocked by the warm air above.
The impact of temperature inversions on air quality is a significant concern for Chicago. The city's dense population, ranking as the third most populous in the United States, exacerbates the problem. Various sources contribute to Chicago's air pollution, including transportation, industrial activities, and residential emissions. The combination of these factors with temperature inversions can result in heightened levels of pollution that pose risks to the health and well-being of Chicago's residents.
Transportation is a major contributor to Chicago's air pollution. The city serves as a significant transport hub, with a vast network of federal highways, busy airports, and a range of vehicles, including planes, trains, boats, automobiles, and locomotives. Diesel transport and passenger vehicles are the primary sources of PM2.5 emissions, which are fine particulate pollutants that can have detrimental effects on human health.
To address the issue of air pollution, Chicago has implemented various measures. The establishment of the Department of Air Pollution Control in 1959 demonstrates the city's commitment to investigating and regulating emission sources. Additionally, the city has promoted the growth of transportation, distribution, and logistics facilities, aiming to balance economic development with community health concerns. However, the success of these efforts is evident in the fluctuating rankings of Chicago's air quality over the years, highlighting the ongoing challenge of maintaining healthy air standards in this bustling metropolis.
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Frequently asked questions
The major sources of pollution in Chicago are transportation, daily emissions from residents, and industry.
Tens of thousands of diesel trucks travel through Chicago's industrial corridors daily, and the city is a major transport hub for planes, trains, boats, automobiles, and locomotives.
Chicago's industrial areas, such as those in Austin, contribute to air pollution through the use of diesel engines, coal-fired power plants, and wood-burning devices.
Chicago's location on the shore of Lake Michigan makes the city prone to temperature inversions, where cool surface-level air becomes trapped by a warmer air layer above, preventing normal pollution dispersion.
