Particulate matter (PM10 and PM2.5) ambient concentrations are modelled for Switzerland. Based on emission inventories, primary particles are determined by dispersion modelling, and secondary aerosols are modelled empirically. Primary and secondary particles contribute similar percentages to the total concentration. Between 2005 and 2020, a PM10 emission reduction of 15% is expected (PM2.5: 30%) due to a number of reduction measures. The average population weighted PM10 concentration is 21.6 μg/m3 in 2005 and 19.4 μg/m3 in 2010. For 2020, a value of 18.2 μg/m3 is projected. 66 %± 10 % of the inhabitants were exposed to excessive concentration (> 20 μg/m3) levels in 2005 and 43 % ± 11 % in 2010. This number is expected to further decrease to 31 % ± 11 % until 2020.

PM10 and PM2.5 ambient concentrations in Switzerland

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