Smoky and orange skies could be a new normal in the summer months in the Midwest and Northeast U.S., but it isn't a seasonal ...

It marked the city's first smog incident. Here's what it looked like-back then and over the years that followed.

From coal-fired cities to industrial river valleys, a smokey fog crept in quietly and left behind chaos: schools shut down, people collapsed in the streets, and entire towns were brought to a ...

Oregon DEQ has issued a smog advisory for Salem, Portland, Hermiston and Ontario as wildfire smoke blankets central, southern ...

With the onset of the winter smog season still months away, Punjab has stepped up pre-emptive enforcement against major ...

North Texas smog has reached unhealthy levels 14 times this year. A moderate forecast offers only a partial reprieve.

Economic interests have shaped society’s response to pollution. Now, policy needs to align with the scientific evidence to clean up our air.

Proponents of a "redesignation" say it reduces environmental red tape and promotes economic growth. Opponents say it strips public health protections.

CHIP JACOBS, WRITER: It's hard for us to imagine what it was like that day in July 1943. It appeared quite suddenly. CHRISTOPHER WELLS, HISTORIAN: Thick, dark, silvery blue clouds descended over the ...

The Great Smog of 1952 took hold on London exactly 61 years ago, claiming an estimated 4000 lives. A spell of cold weather, combined windless conditions then gathered air particles mainly from the ...