This state indicator shows how often the air pollution exceeds the (daily) limits. Increasing number of exceedences shows a decline in air quality.
Number of exceedances has been increasing over the years; one reason of this is the air quality limit values decreasing in cascades since 2009 as identified in the By-Law on Air Quality Assessment and Management (BAQAM). Besides the reality that the targeted improvement in air quality is not being achieved, two reasons to the increasing number of exceedences are: lowering of the limit values every year and increasing number of monitoring stations.
In 2017, the daily limit value was set to 70 μg/m3 for PM10 parameter and 175 μg/m3 for parameter SO2. In 2017, the total number of overshoots is 13827 for the PM10 parameter and 256 for the SO2 parameter. In the period between 2015-2017, according to the number of border crossings calculated on the basis of all stations; Although there was a 12.5% decrease in both limit values in 2017 compared to 2016, there was a 36% increase in the number of overshoots for the PM10 parameter and a 20% decrease in the number of overshoots for the SO2 parameter .