Table 1

Air pollutant levels and meteorological conditions in urban background in Copenhagen (May 2001-December 2008)

N* (days)Mean (SD)Median (IQR)Percentile
25th75th
Air pollutant (unit)
 NOx (ppb)264514.46 (8.08)12.48 (8.62)9.0717.69
 NO2 (ppb)264511.34 (4.96)10.48 (6.53)7.6814.21
 PM10 (μg/m3)256926.18 (12.84)23.7 (13.4)17.931.3
 PM2.5†(μg/m3)177310.32 (5.39)8.98 (4.8)7.0111.81
 UFPs (particles/cm3)16536398.24 (3203.85)5839.13 (3812.86)4138.227951.08
Meteorological factors (units)
 Dew point (C)26795.16 (6.03)5.2 (9.43)0.8110.24
 Wind speed (m/s)26194.13 (1.49)3.89 (1.99)2.994.98
 Global radiation (W/m2)2679116.8 (97.51)95.72 (162.8)26.77189.57

  • ↵* Number of days with available measurements of pollutants.

  • ↵† PM2.5 is measured with TEOM that measures about 30% too low particle mass due to evaporation of part of the particle mass inside the instrument.