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The measurement units for nitrogen dioxide are in microgrammes per cubic meter.
The NO2 hourly limit of 200 ug m-3 is deemed breached if more than 18 exceedances have occurred.
The Graph shows the latest available results over the last 7 days.
Sharp changes are often due to maintenance or other instrument effects and should be treated cautiously.
This data has not yet been validated as it is received automatically from the site.
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