There were also concerns over air quality around next week's Fourth of July celebrations in the US. Smoke has drifted over large sections of the US and Canada this week.

Air quality in Courtenay is improving while pollution caused by wood stove smoke has been steadily decreasing over the past five years, according to a recent report presented to the City of Courtenay ...

"(It) is a giant blow to air quality efforts worldwide," she said. Reuters is a news agency founded in 1851 and owned by the Thomson Reuters Corporation based in Toronto, Canada. One of the world ...

Since 2008, embassies and other diplomatic posts had been publishing data about local air quality. In many countries, it was the only reliable source of such information. By Lisa Friedman and Brad ...

SINGAPORE, March 11 (Reuters) - 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 ...