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One-Third of World Exposed to Extremely High Ozone, Copernicus Says

CAMS warns record heat, widespread wildfires and a strengthening El Niño with human emissions are driving more ozone formation and long-range smoke transport that may worsen air quality later this year.

San Diego Supervisors Propose U.S.-Side Capture-and-Treat Plan for Tijuana River Sewage

Chicago Turns On Citywide Neighborhood Air-Quality Network

Bay Area Air District Weighs Exemptions in Gas Heater Phase-Out

Nebraska Wildfire Smoke Blankets Denver, Spurring Haze and 911 Calls

Body Found After North Hills Vacant-Building Fire as K-9 Alerts Prompted Dayslong Search

Garnet Fire Reaches McKinley Grove as Crews Battle to Save Ancient Sequoias

Lightning-Triggered Wildfires Burn Nearly 21,000 Acres in Northwestern Colorado

Canadian Wildfire Smoke Extends Air Quality Alerts Across Midwest and Northeast

Rain Eases Drought in Chicago as Fog and Wildfire Haze Linger