Cities in California make up a significant proportion of the country's most polluted metropolitan areas when it comes to air quality, according to a new report.

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 ...

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

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 ...

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 ...

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 ...

Most cities in the United States had between 5.1 and 15 micrograms of pollution per cubic meter of air, according to IQAir. A number of cities, especially along the West Coast, New England and in ...

Smoke from the Canadian wildfires continues to bring dangerous air quality to parts of the northern U.S., with hazy and smoky skies also possible for the East and South.

A study by UC San Diego researchers reveals that pollutants found in the sewage-laden Tijuana River are ending up in the air ...