Pollutionwatch: How harmful ozone builds up near ground in heatwaves

Concentrations of gas were continuously raised in Europe during June hot spell, with potentially deadly effects

Widespread air pollution was a feature of June’s record-breaking heat across western Europe and is likely to increase again as the UK experiences its third heatwave of the summer.

UK weather warnings for extreme heat from 22 June were followed by a rare https://www.london.gov.uk/mayor-london-issues-high-pollution-alert-1">high air pollution alert from the London mayor.