Air pollution

North American smoke alerts in maps and images

US East Coast facing worst air quality in years

Canadian Grand Prix 'not at risk' despite wildfires

Is climate change fuelling Canada's wildfires?

BBC Weather forecast on Canada wildfire smoke. Video, 00:01:33BBC Weather forecast on Canada wildfire smoke

NYC Mayor: 'This is an unprecedented event' Video, 00:00:35NYC Mayor: 'This is an unprecedented event'

Worst air in years hits Washington DC and Philadelphia

Tell your party not to discredit science, PM urged

Half of outer London vans not fit for ULEZ - data

Health workers cycle 250km to support ULEZ expansion

Father challenges BP at meeting after son's death

Biomass boiler on farm becomes permanent fixture

BBC Inside Science. Rocket Launch Pollution. Audio, 28 minutesBBC Inside Science

Firm could face £140,000 Low Emission Zone fines

Mayor urged to help businesses swap to cargo bikes

Congestion charge plan for Cardiff motorists

Key city centre road set to stay open to cars

ULEZ challenge waste of taxpayer money, says mayor

Labour MPs seek ULEZ support for non-Londoners

ULEZ expansion plans to face judicial review

Council does not say how many drivers fined in CAZ

Drone footage captures thick smog choking Chiang Rai. Video, 00:00:15Drone footage captures thick smog choking Chiang Rai