The Department for Environment, Food and Rural Affairs insists the UK's air is safe after a landmark ruling that the Government is failing in it's legal duty to protect people from the harmful effects of pollution.
“Air quality has improved significantly in recent decades and almost all of the UK meets EU air quality limits for all pollutants.”
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The Labour mayor will seek a second term in City Hall.
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The 23-year-old, from Enfield, north London, has been released by police under investigation.