Exceedances of air quality objectives due to traffic measured in traffic stations and background stations

The figure shows the annual mean and back ground concentrations of NO2, PM10 and PM2.5 observed at traffic stations in 2013.

The two highest PM10 concentration classes (dark orange and light orange) correspond to the 2005 annual LV (40 μg/m3)
and to a statistically derived level (31 μg/m3) corresponding to the 2005 daily LV. The lowest class corresponds to the WHO air quality guideline for PM10 of 20 μg/m3.