In the UK, most urban areas have illegal levels of air pollution and ministers have lost three times in the high court after challenges over the inadequacy of their action. The latest government action plan, called “pitiful” by environmental lawyers, revealed air pollution was actually much worse than previously feared.
Globally, with smoking on the decline, air pollution now causes more deaths annually than tobacco. However, researchers think the harm known to be caused by air pollution, such as heart attacks and lung disease, is only “the tip of the iceberg”.
The figure of 7 million early deaths is certain to be an underestimate, as it only includes particle pollution and the five most firmly linked causes of death. Early estimates using improved models indicate a total figure of 9 million from particle pollution.
Daniel Krewski at the University of Ottawa, one of the team behind the newer estimate, said: “This suggests that outdoor air pollution is an even more important risk factor for health than previously thought.”
Each passing month sees new studies showing further harms of toxic air, with recent revelations including a “huge reduction” in intelligence, millions of diabetes cases and the first direct evidence of pollution particles in mothers’ placentas.
The cost of the lost lives and ill health caused is also a colossal economic burden: $5tn a year, according to a World Bank report. Tackling air pollution by closing polluting power plants and shifting to cleaner transport, such as cycling or electric cars, has a double benefit as it also tackles climate change.
Neira said that, given the overwhelming evidence of harm from air pollution, any politician who failed to tackle air pollution would be judged harshly by future generations – and the law.
“Politicians cannot say in 10 years from now, when citizens will start to take them to court for the harm they have suffered, that they didn’t know,” she said. “We all know pollution is causing major damage and we all know it is something we can avoid. Now we need to react collectively and in a very dramatic and urgent way.”

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