The Enviromental Protection Agency manages the national ambient air quality monitoring network.
The hourly limit for NO2 is 200 ug/m3. The limit is deemed breached if more than 18 exceedances occur during the year. The table below shows the number of exceedances at stations in Ireland in 2020.
31st December
aexceedance dates:
Dundalk
09/12/2020 15:00