Background
Nitrogen dioxide (NO2), particulate matter (PM10 and PM2.5) and polycyclic aromatic hydrocarbons (PAH) are currently the main air pollutants in European cities. Many cities in the EU, including in Austria, are currently unable to meet the Union's limits for PM10 (40 μg/m³ annual mean value) and NO2 (40 μg/m3 as a mean annual value). In Austr ...