90.4 percentile of PM10 daily concentrations in 2018

Observed concentrations of PM10 in 2018. The map shows the 90.4 percentile of the PM10 daily mean concentrations, representing the 36th highest value in a complete series. It is related to the PM10 daily limit value, allowing 35 exceedances of the 50 μg/m3 threshold over 1 year. Dots in the last two colour categories indicate stations with concentrations above this daily limit value. Only stations with more than 75 % of valid data have been included in the map. The possibility of subtracting contributions to the measured concentrations from natural sources and winter road sanding/salting has not been considered.