Air pollution

Steel dust 'to be cut by three-quarters'

'Our children are suffocating' Video, 00:01:58'Our children are suffocating'

Addis Ababa goes traffic free for a day

Why are face masks selling out in Bangkok? Video, 00:01:55Why are face masks selling out in Bangkok?

Air quality worsens on most-polluted street

Mayor 'stalling on city clean air plan'

Southampton Clean Air Zone plan agreed

City's £50 clean air charge approved

Watch how pollution moves across Europe

Traffic pollution 'significant issue' in NI

New plan to tackle air pollution

Tube particle pollution 'worse than roads'

Pollution charging zones 'would not work'

Fire crews get testing kit after gas cloud

'Mysterious' smell gets up Tehran noses

Scotland's first low-emission zone launched

London transport review of 2018

Minicabs to pay London congestion charge

Taxis oppose city clean air charge

CO2 emissions reach 'all-time high'

Is Delhi's air causing lung cancer? Video, 00:01:39Is Delhi's air causing lung cancer?

Madrid bans old cars to cut pollution

Is China behind global coal power surge?