According to figures released by the reputable air monitoring company IQAir.com the cleanest city in Denmark is the
capital, Copenhagen. Only during the month of April did figures show a
“Moderate” reading for PM2.5 (between 12.1 and 35.4 µg/m³). June, July, August
and November returned a “Good” reading between 10 and 12 µg/m³. For the
remaining seven months, Copenhagen achieved the target figure as suggested by the WHO (0 – 10 µg/m³).