Los Angeles' first documented smog attack — yes, we had smog attacks — was in 1943. We've been fighting the sources of pollution and the quirks of geography that trap it ever since.

Smog is produced by a set of complex photochemical reactions involving volatile organic compounds (VOCs), nitrogen oxides and sunlight, which form ground-level ozone.

The U.S. EPA plans to reject Southern California's plan to clean up ozone pollution, with big penalties for the region. Enough with the blame game. Officials need to get to work.

In the heart of New Mexico’s high desert, we like to believe our air is immaculate and skies endlessly blue. But the truth is more complex. With growing vehicle congestion, ...

The average cost for a SMOG check in the U.S. is $30 on the low end, and up to $60 on the high end. To help prepare for your next emission's check, avoid bad habits that are ruining your car's ...

Heavy smog and low visibility in New Delhi, India, on January 9, 2023. Sanchit Khanna/Hindustan Times/Getty Images New York’s PM2.5 levels peaked Wednesday afternoon, measuring 303.3 micrograms ...

Air quality board will vote Friday on phasing out water heaters and furnaces powered by natural gas. These appliances emit more smog-causing gases than the region's largest industrial polluters.

Record-breaking levels of thick, toxic smog that have shrouded eastern Pakistan and northern India since last month can be seen in striking satellite imagery. A huge cloud of gray smog blankets ...

Pakistan's smog is visible from space. This activist is 'frustrated' but won't give up : Goats and Soda The government in Lahore has closed schools and public spaces and shut down factories.

New Delhi — Authorities in India's sprawling capital city imposed even stricter emergency measures Monday in a bid to prevent illness as thick smog blanketed New Delhi. The air pollution was ...