Satellite imagery from NASA's Worldview shows a vast, grey smog cloud stretching over Pakistan's Punjab province, capturing ...

The only reason why these gases are not continuously accumulating in the atmosphere and we are not choking in a giant smog cloud is that the atmosphere makes its own detergent: hydroxyl.

Only seven nations met WHO air quality standards last year, data showed yesterday, as researchers warned that the war on smog ...

Only seven countries met World Health Organization (WHO) air quality standards last year, data showed on Tuesday, as researchers warned that the war on smog would only get harder after the United ...