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Table 1 Nitrogen dioxide (NO 2 ) concentrations by measurement campaign and site type (μg/m 3 )

From: Nitrogen dioxide levels estimated from land use regression models several years apart and association with mortality in a large cohort study

   Urban Background sites Traffic sites Total
1995/96 measurements Number of sites 44 23 67
Mean (sd) 43.7 (6.0) 48.6 (6.3) 45.4 (6.5)
Range 30.0-57.3 35.4-63.5 30.0-63.5
2007 measurements in the same locations Mean (sd) 40.5 (7.5) 46.8 (10.5) 42.7 (9.1)
Range 25.0-55.6 29.0-70.2 25.0-70.2
2007 measurements Number of sites 47 30 78
  Mean (sd) 40.8 (7.6) 51.0 (12.5) 44.6 (11.0)
  Range 25.0-55.6 29.0-72.6 25.0-72.6