Scatterplots of short-term and long-term atmospheric concentrations for (a) O3 and (b) NO2. Black dots symbolize urban sites (N ¼ 10), gray dots rural sites (N ¼ 5).
Table 2
Descriptive statistics of short- and long-term air pollutant concentrations at all sites and separated for urban and rural sites. SD ¼ standard deviation, Min ¼ minimum,
Max ¼ maximum, all values in mg/m3. Equality of means (tested by t-test or ManneWhitney test) refers to differences between urban and rural sites, significance levels:
***p 0.001, **p 0.01, ns: not significant (p > 0.05).
Urban and rural sites Urban sites Rural sites Equality of means
Short-term Mean SD Min Max Mean SD Min Max Mean SD Min Max p Test
O3 70.0 5.6 60.7 80.3 68.5 5.4 60.7 80.3 73.0 5.4 65.9 78.4 ns t-test
NO2 16.1 10.2 5.2 42.2 21.1 8.8 13.0 42.2 5.9 0.8 5.2 7.2 ** t-test
Urban and rural sites Urban sites Rural sites Equality of means
Long-term