Air pollution 'silent killer' in African cities: study

Pollution in Africa's fast-expanding cities is deadlier than thought, yet green solutions could save tens of thousands of lives and avert billions of dollars in damage, a report said Thursday.

Polish researchers invent anti-smog sound cannon

In a battle against Poland's constant smog, scientists are testing out a new "cannon" that uses soundwaves to push toxic particles higher into the atmosphere to allow residents to breathe.

Toxic Sydney bushfire haze a 'public health emergency'

Australia's biggest city is facing a "public health emergency" over the bushfire smoke that has choked Sydney for weeks, leading doctors warned Monday after hospitals reported a dramatic spike in casualty department visits.

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