ozone air pollution, short-term particle pollution, and year-round particle pollution. Bakersfield, California, tops the list as the Most Polluted City in America. Across the three ratings ...

Tens of millions more people in US are exposed to toxic air ... among the top ten most polluted in the nation. These cities suffer from high levels of particle pollution due to agricultural ...

The report then ranks the most polluted and cleanest U.S. cities based on an area’s number of unhealthy air days and the city’s particulate pollution. This year’s report looked at a three ...

The report then ranks the most polluted and cleanest U.S. cities based on an area’s number of unhealthy air days and the city’s particulate pollution. This year’s report looked at a three ...

The U.S. Environmental Protection Agency warns that wildfire smoke contains dangerous pollutants in the form of fine ...

Even as air quality in America has improved ... This is an attack not just on air-pollution research but on an entire scientific approach. Most public-health research is observational by necessity ...

An air quality map shows conditions improving in the U.S. on Friday as smoke from the Canadian wildfires subsides.

Smoke from more than 100 wildfires blazing in Canada is expected to spread to impact air quality in more U.S. state.

Canadian wildfire smoke has entered the Upper Midwest and poses significant health impacts in the hardest-hit areas.

Smoke from Canadian wildfires began to worsen air quality in the eastern U.S. on Wednesday as several Midwestern states ...