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History

PM10

Evolution of the number of monitoring stations where PM10 is measured, including both the telemetric stations and the stations used in specific studies. The number of PM10 monitoring stations in Belgium has risen from 20 in 1997 to 68 in 2015. Because the number of monitoring stations for 2004 is considerably less than in 2015, the uncertainty on the interpolated annual mean concentrations is greater in those initial years. For the Walloon region, this applies from 2008 onwards.

pm10_stations_2015

 

PM2.5

Evolution of the number of monitoring stations where PM2.5 is measured, including both the telemetric stations and the stations used in the specific studies. The number of PM2.5 monitoring stations has risen significantly from 5 in 2000 to 67 in 2015. Because the number of monitoring stations for 2008 is substantially less than in 2015, the uncertainty on the annual mean values is greater in these initial years. This is especially true for Wallonia where no PM2.5 was measured before 2008.

pm25_stations_2015

 

Ozone

Evolution of the number of monitoring stations where ozone is measured, including both the telemetric stations and the stations used in specific studies. The number of ozone monitoring stations has risen from 12 in 1990 to 41 in 2015. Since the number of monitoring stations in 1997 is substantially lower than in 2015, the uncertainty on the interpolated annual mean concentrations is larger in those initial years.

o3_stations_2015

 

Nitrogen Dioxide

Evolution of the number of monitoring stations where NO2 is measured, including both the telemetric stations, stations used in specific studies and stations that are managed by the electricity producers and the Belgian Petroleum Federation in cooperation with the regional environmental administrations. The number of NO2 monitoring stations has risen from 26 in 1990 to 91 in 2015. Since the number of monitoring stations before 1997 is considerably less than in 2015, the uncertainty on the annual mean concentrations is greater in those initial years.

no2_stations_2015

 

Sulfur Dioxide

Evolution of the number of monitoring stations where SO2 is measured, including both the telemetric stations, stations used in specific studies and stations that are managed by the electricity producers and the Belgian Petroleum Federation in cooperation with the regional environmental administrations. The number of SO2 monitoring stations has  dropped from 81 in 1990 to 55 in 2015. In the years where there are fewer monitoring stations, the interpolated values have a larger uncertainty.

so2_stations_2015