Number of NO2 pollution days in urban sites in the UK 2010-2020

The mean number of pollution days caused by nitrogen dioxide (NO2) in urban sites decreased over this period, dropping from 4.9 days in 2010 to 0 days in 2020. This was the first time during this period that NO2 caused, on average, no days with moderate or higher air pollution days in urban sites. Nitrogen dioxide is a deadly air pollutant, and is one of the main causes of premature deaths worldwide.