Cincinnati air quality ranks among nation’s worst for year-round particle pollution, new report finds

Cincinnati air quality continues to raise public health concerns.

Most especially that the city’s air quality ranked among the nation’s worst for year-round particle pollution in the American Lung Association’s latest “State of the Air” report.

The Cincinnati metropolitan area’s long-term air pollution remains a significant public health concern despite years of gradual improvement, according to the American Lung Association’s 2026 State of the Air report. The annual assessment found that the Cincinnati-Wilmington, Ohio-Kentucky-Indiana metro area ranked tied for 17th worst in the United States for year-round particle pollution (PM2.5), highlighting continued exposure to unhealthy levels of fine particulate matter. The report also ranked the region 31st worst for short-term particle pollution, while ozone pollution remained an ongoing seasonal challenge.

The findings underscore the difference between daily air quality forecasts and long-term environmental health trends. On many days, Cincinnati records a “Good” or “Moderate” Air Quality Index (AQI), yet years of monitored pollution data continue to place the metro area among the country’s more polluted regions. The American Lung Association analyzed data collected by the U.S. Environmental Protection Agency between 2022 and 2024 to produce this year’s rankings.

Residents often notice poor air quality during summer heat waves or when wildfire smoke drifts into the Ohio Valley. However, the report focuses on chronic exposure over several years rather than isolated pollution events.

Why Cincinnati air quality continues to rank poorly

Fine particulate matter, commonly known as PM2.5, consists of microscopic particles that can travel deep into the lungs and enter the bloodstream. These particles originate from multiple sources, including:

• Vehicle exhaust
• Industrial facilities
• Coal- and natural gas-fired power plants
• Construction activities
• Wood-burning emissions
• Regional wildfire smoke

According to the American Lung Association, even relatively small increases in annual PM2.5 concentrations can significantly affect public health because residents breathe polluted air repeatedly over long periods. Unlike daily pollution spikes, year-round particle pollution reflects chronic exposure that may contribute to respiratory and cardiovascular diseases.

The report noted that approximately 152 million Americans—about 44% of the U.S. population—live in areas receiving failing grades for at least one major air pollution measure. Nearly half of all American children also live in counties with unhealthy levels of ozone or particle pollution.

For Cincinnati, geography also plays a role. The Ohio River Valley can trap pollutants during periods of stagnant weather, while emissions from transportation corridors, manufacturing, and regional power generation contribute to background pollution throughout the year.

Health risks associated with Cincinnati air quality

Medical experts have long warned that prolonged exposure to fine particle pollution increases the risk of several health problems.

According to the American Lung Association, PM2.5 exposure has been linked to:

• Asthma attacks
• Chronic obstructive pulmonary disease (COPD)
• Heart attacks
• Stroke
• Lung cancer
• Premature death among vulnerable populations

Children, older adults, pregnant women, and individuals with heart or lung disease remain the most susceptible to health effects. Even healthy adults may experience irritation during periods of elevated pollution or prolonged outdoor activity.

While daily AQI forecasts help residents decide whether to limit outdoor exercise, long-term rankings provide insight into cumulative exposure over many years.

National and local reporting highlights similar concerns

The American Lung Association’s findings have received national and regional attention following the report’s release in April. The organization emphasized that although some metropolitan areas, including Cincinnati, recorded their best annual PM2.5 averages on record, many cities remained among the nation’s most polluted because improvements occurred nationwide. As a result, rankings shifted only modestly despite measurable progress.

Other Ohio metropolitan areas also continued to struggle with air quality. According to reporting by Axios Cleveland, the Cleveland-Akron-Canton metro area ranked among the nation’s worst for annual particle pollution while still showing long-term improvement over previous decades.

The Cincinnati region has also experienced periodic air quality alerts in recent years due to Canadian wildfire smoke, ozone formation during extreme heat, and stagnant weather systems that limit atmospheric mixing. Those events can temporarily push daily AQI readings into unhealthy categories, even though the annual report measures broader trends rather than isolated incidents.

What residents can do during poor air quality days

Although individuals cannot eliminate regional pollution sources, public health agencies recommend several precautions when air quality worsens.

Residents can reduce exposure by:

• Checking daily forecasts through the AirNow website before extended outdoor activities.
• Following local air quality alerts issued by the Ohio Environmental Protection Agency.
• Limiting strenuous outdoor exercise during unhealthy air quality days.
• Using high-efficiency air filtration indoors when pollution levels rise.
• Keeping asthma and COPD medications readily available.

Health officials stress that these measures are especially important for vulnerable populations during summer ozone season or wildfire smoke events.

Long-term improvements remain possible

Despite Cincinnati’s high national ranking for year-round particle pollution, the report also reflects decades of progress since the passage of the federal Clean Air Act. Nationwide emissions controls, cleaner vehicles, industrial regulations, and power plant upgrades have significantly reduced many forms of air pollution compared with previous decades.

The American Lung Association argues that continued enforcement of clean air regulations and investments in cleaner transportation and energy sources remain essential for sustaining those gains.

For Cincinnati, future rankings will depend on regional emissions trends, weather patterns, and broader environmental factors such as wildfire smoke, which has increasingly affected air quality across much of the eastern United States.

Residents looking only at a daily AQI may see acceptable conditions on many days. However, the latest State of the Air report serves as a reminder that long-term Cincinnati air quality remains an important public health issue requiring continued monitoring and policy attention.