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Table 2 The difference in concentration of NO2 due to a distance from traffic major road

From: Coal burning-derived SO2 and traffic-derived NO2 are associated with persistent cough and current wheezing symptoms among schoolchildren in Ulaanbaatar, Mongolia

Distance

≤ 100 m

> 100 m

p value

District

NO2 (ppb) mean ± SD

A

31.8 ± 17.6

29.1 ± 19.2

0.026

B

33.5 ± 17.6

23.1 ± 13.5

0.001

C

33.3 ± 21.6

26.3 ± 18.9

0.005

D

17.5 ± 12.2

17.8 ± 13.6

0.147

  1. NO2: nitrogen dioxide, ppb: parts per billion, SD: standard deviation
  2. ≤ 100 m—within 100 m from the traffic major road, > 100 m—outside, p value (two-sided)—significance
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Environmental Health and Preventive Medicine

ISSN: 1347-4715

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