Smog linked to wildfires is getting worse across much of the U.S., playing a role in more than 300 additional premature ...

Minnesotans weathered the third air quality alert triggered by ozone of the year Monday. If two more happen, it will tie the ...

Tailpipe emissions standards implemented early this century helped reduce smog levels. Longer, more intense fire seasons have ...

Climate models suggest a small nuclear war in the tropics would do even more damage to the ozone layer than a larger nuclear ...

Ozone pollution has worsened in much of the continental United States over the past decade, fueled by wildfires and the ...

We need ozone in our atmosphere to protect us from harmful ultraviolet rays, but too much at the ground level can make people sick. Ground-level ozone forms more often in the summer, making it a ...

While you may think of ozone as a welcome element in our Earth's atmosphere that protects us from the sun's harmful radiation, ground-level ozone that we breathe is a harmful pollutant.

So far this year, the South Coast air basin, which includes Los Angeles, Orange, Riverside and San Bernardino counties, has ...

An air quality alert is in effect for the Twin Cities metro and parts of central Minnesota from noon to 9 p.m. Tuesday as ...

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