We call it ‘smog’ or ‘haze’ but it’s a real killer. There are ways to find out where it’s worst, and clean air campaigns which are well worth supporting

These days fresh air is hard to find, even in parks. Nearly a quarter of London’s green open spaces now breach laws on nitrogen dioxide pollution (the stuff that spews out of diesel exhausts).

When the air in the park is worse than at the side of the road, that’s a new low. If you’re a Londoner, type in your postcode at Asi Open Data to find the nearest park where NO2 emissions don’t exceed 40 micrograms per cubic metre.

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Source: Guardian Environment