The primary pollutant in Milwaukee on Monday is PM2.5, which can be caused by wildfire smoke, vehicles and power plants.

Southeast Michigan and central regions see poor air quality for sensitive groups due to pollutants being released from ...

Atmospheric aerosols influence climate forcing, air quality, visibility, and human health, but their properties vary widely across space and time. Satellite instruments equipped with multi-angle and ...

On a cool spring morning in a northern forest, the ground feels soft underfoot. Mist hangs between the trunks, and the air smells of wet leaves and old humus; the slow alchemy that keeps a forest ...

The city has installed 76 sensors to track levels of particulate matter and nitrogen dioxide — pollutants that aggravate ...

An innovative study involving 27.8 million older adults in the U.S. has revealed one of the most significant connections ever ...

The Marion County Public Health Department is launching a pilot project to install five PurpleAir monitors throughout West ...

Air quality appears to have worsened in the Capital Region and Hudson Valley. Stagnant winter air trapping pollutants close ...

Part of the Breathe Philly initiative​, more than 70 ground-level monitors installed across Philadelphia will provide hourly air quality measurements.

Philadelphia officials launched the "Breathe Philly" air‑monitoring program on Wednesday, unveiling 76 small sensors across ...

Another foggy start, highs near 50 today in south-central Pennsylvania ...

Stronger winds helped clear some pollutants from Michigan's air, but air in the Lower Peninsula could still cause issues for sensitive groups.