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