The data below is updated automatically each day and shows how the monitoring sites within the network are progressing against national objectives.
The PM10 and NO2 dials show the monitoring site with the highest number of exceedances and may change each month according to the data.
Progress through the
Day 228 of 365
-- 35 exceedances allowed
Average NO2 concentration
London Hillingdon Oxford Avenue
-- 40 µgm-3 Limit Value