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Compliance Dashboard

Note: This dashboard only shows data from the monitoring sites at Heathrow Airport.

The data below is updated automatically each day and shows how the monitoring sites within the network are progressing against national objectives.

Dashboard Overview

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
current year

Day 107 of 366

PM10 Exceedances
to date

London Harlington
1 exceedances

-- 35 exceedances allowed

Average NO2 concentration
to date

London Hillingdon Oxford Avenue
27.1 µgm-3

-- 40 µgm-3 Limit Value


Progress through year (24 hour exceedances)


Progress through year (annual mean)