Hot weather sparks unprecedented four days of high air pollution

Sunny weather and light winds over the past four days have triggered continuous warnings of high ambient ozone concentrations.

It is the first time since the EU’s Ambient Air Quality Directive came into force in 2008 that such a stretch has been seen in the UK, according to DEFRA's records. It was triggered by the warm weather over the bank holiday weekend.

Damp weather has now largely ended the episode, although five sites reported high levels of ozone this morning, with 18 at moderate levels of ozone or particulates. Isolated pockets of high and moderate pollution are predicted for tomorrow.

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