Since 2010, the population's PM2.5 exposure above an annual average of 10 µg/m³ (interim target 4 of the new guideline values of the World Health Organisation (WHO) from 2021, equal to the old WHO guideline value from 2005) has decreased significantly in Germany.However, between 2010 and 2021, almost the entire population was exposed to particulate matter levels above the current WHO guideline val... read more