Particulate Matter measured at Letterkenny

Data from Particulate Matter measured at Letterkenny

The measurement units for particulate matter are in microgrammes per cubic meter.

The Graph shows the latest available data for particulate matter 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.


The particulate matter, PM10 daily limit of 50 ug m-3 is deemed breached if more than 35 exceedances occur in a calendar year.

The number of exceedances for the current year can be accessed here.


The particulate matter, PM2.5 annual limit value is 25 ug m-3 . There is no hourly or daily limit value for PM2.5.


Check out our 'what we monitor' page for more information on particulate matter.