The limit, set by the European Union, is 40 micrograms of NO2 per cubic metre of air.

BBC: Dundee Biomass Centre

Four years ago, Cotswold District Council made an Air Quality Management Area Order because the NO2 levels at the Air Balloon roundabout exceeded the recommended thresholds.

BBC: Google

He was made aware of the concerns by a Cotswold councillor asking what could be done about high levels of nitrogen oxide (NO2) in the area off the A417.

BBC: Google