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Ozone and Nitrogen Dioxide Levels

Data from Ozone and Nitrogen Dioxide Levels

The measurement units for nitrogen dioxide and ozone are in microgrammes per cubic meter.  Find out more information on what we monitor.

  • The NO2 hourly limit of 200 ug m-3 is deemed breached if more than 18 exceedances have occurred.
  • The O3 information threshold is 180 ug m-3.

The Graph shows the latest available results over the last 14 days.

This data has not yet been validated as it is received automatically from the site.

Sharp changes are often due to maintenance or other instrument effects and should be treated cautiously.