The Inland Northwest saw record-breaking hazardous air quality over the weekend as a weather system blew smoke from Oregon and California wildfires into the area before stagnating, allowing the heavy ...

The air quality is reaching dangerous levels in parts of the Upper Midwest and north central U.S., where copious amounts of smoke from wildfires in Canada are wafting south across the international ...

The Hazardous Air Quality Emergency Preparedness Bill will ensure local governments have the resources they need to respond to this dangerous effect of climate change. Smoke from wildfires in Canada ...

Air quality in India's capital New Delhi deteriorated to hazardous levels on Tuesday with readings the highest in the world, ...

Fireworks set off to celebrate the Diwali festival have worsened the air quality in India’s capital New Delhi, making it the ...

Lahore is the world's most polluted city. Air quality is hazardous. Health warnings are issued. Authorities are cracking down ...

New Delhi and its metropolitan region — home to more than 30 million people — routinely ranks among the world’s most polluted ...