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Compliance Dashboard

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


Summary (year to date)

Monitoring Site Annual mean (µgm-3) Data Capture Number of hours exceeding Max hourly exceedance (µgm-3)
Heathrow Green Gates 21.0 99.8 0 n/a
Heathrow Oaks Road 20.0 99.7 0 n/a
London Harlington 21.6 99.6 0 n/a
London Hillingdon Oxford Avenue 27.4 90.9 2 216.4

Exceedance history (year to date)

Number Date Monitoring Site Max exceeding
1 08/09/2023 London Hillingdon Oxford Avenue 216.4