"The Second Step," Houston smog, a mathematician and a chalkboard, and freeway traffic, recorded between December 27 and ...

Each year for the past 26 years, the American Lung Association has analyzed data from official air quality monitors to compile the report and track unhealthy levels of ozone air pollution (smog ...

The iconic skyline of downtown Los Angeles has been clouded by smog for decades, so this title should come as no surprise to Angelenos. Yet again, L.A. is the smoggiest city in the U.S., according ...

Baltimore County received an "F" for ozone smog ... particles in the air. Nine other counties dropped from "A" grades in the 2024 report to "C" grades in 2025. Baltimore City maintained several ...

St. Louis, Missouri, was ranked 21st worst city across the country for its ozone levels this year, while Kansas City was ...

The cloud, named Eos after the Greek goddess of dawn, had eluded researchers because it contains very little carbon monoxide ...

The northern part of Quezon City, which is nearer the Montalban landfill, showed unhealthy air quality according to QC’s air quality report. Both local government units urged residents not to ...

Out of the California cities that ranked the worst for ozone and particle pollution in 2025, the Fresno and Sacramento ...

Stricter air-quality rules, pushed through in the last days of the Biden administration, face an uncertain future under a ...

NEW YORK – Smoke from a massive wildfire burning in New Jersey reached New York City early Thursday, impacting air quality in America's largest city. New York state's departments of ...