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Table 3 Daily (24 hours noon-to-noon, central site) median air pollution concentration and meteorology in the four cities

From: Particulate matter air pollution and respiratory symptoms in individuals having either asthma or chronic obstructive pulmonary disease: a European multicentre panel study

  Helsinki Athens Amsterdam Birmingham
  10/2002-4/2004 10/2002-3/2004 10/2002-3/2004 11/2002-3/2004
  % missing Median Range % missing Median Range % missing Median Range % missing Median Range
PNC 104·cm-3 5.0 1.3 (0.2, 4.4) 10.5 2.0 (0.3, 6.6) 2.4 1.8 (0.8, 4.4) 21.2 1.9 (0.2, 5.1)
PM10 μg·m-3 38.1 12.4 (0.2, 156.4) 6.3 51.7 (8.5, 158.7) 3.3 26.6 (7.4, 126.0) 14.6 16.6 (2.8, 126.2)
PM2.5 μg·m-3 34.6 7.4 (0.3, 33.2) 6.3 22.7 (2.4, 79.1) 3.1 16.7 (4.0, 103.4) 12.8 8.4 (0.7, 71.9)
PM10-2.5 μg·m-3 39.1 4.6 (0.0, 152.6) 6.7 28.8 (0.7, 126.4) 3.7 9.4 (0.9, 24.2) 15.6 6.9 (0.3, 118.9)
Absorbance 10-5·m-1 38.9 1.2 (0.2, 3.8) 6.3 3.5 (0.9, 8.4) 3.1 1.9 (0.5, 7.2) 12.8 1.3 (0.2, 4.9)
NO2 μg·m-3 1.4 22.7 (4.5, 77.9) 27.4 39.9 (11.8, 110.9) 0.4 38.4 (10.4, 97.3) 0.2 34.4 (7.3, 83.3)
Ozone μg·m-3 1.7 42.5 (4.1, 93.2) 11.8 46.9 (4.7, 108.2) 9.4 33.1 (0.9, 104.3) 0.0 37.3 (0.9, 106.6)
Temperature °C 0.0 2.0 (−22.8, 25.6) 0.0 15.0 (−3.1, 33.2) 0.0 9.1 (−6.1, 25.3) 0.0 9.2 (−1.4, 26.9)
Rel. humidity % 0.0 80.7 (36.5, 100.0) 0.0 66.1 (21.8, 93.2) 0.0 80.8 (38.5, 98.7) 0.0 79.3 (45.8, 97.9)