Air pollution

Toxic air is back again in Delhi - here's why it's so hard to stop it

Toxic haze in Delhi despite 'green' Diwali

Flight path shake-up plan for 'outdated' 1950s airspace over Scotland

London schools to get filters to cut air pollution

Foul skies, fading light: How air pollution is stealing India's sunshine

Town's air quality improves 'after 20mph speed limit'

London nitrogen dioxide levels fall to legal limit

Delhi's toxic air is turning iconic Red Fort black - study

Trial of new School Street to get under way

Decision on liveable neighbourhood due next spring

Thousands of pupils take part in air quality project

Aberdeen's unpaid LEZ fines reach more than £500,000

Vans now pollute more than London cabs - analysis

'No better idea' than new charge - council leader

Clean air zone fees used for school safety schemes

How hot weather can make air pollution worse. Video, 00:00:59How hot weather can make air pollution worse

Scrapped Clean Air Zone signs removal begins

Canadian wildfires prompt New York air quality alert

Air pollution linked to dementia risk, study finds

Congestion charge 'necessary step' supporters say

'We've lost 30% of customers since Ulez expanded'

Bank junction to reopen to black cabs as a trial

Clean air bill championed by cross-party MPs