Table 2 Concentration of medium-term air pollutants in schools participating in the study
From: Impact of close-proximity air pollution on lung function in schoolchildren in the French West Indies
Pollutants | WHO air quality guidelines 2005 | Type of pollution | Number of schools | in μg/m3 | |||
|---|---|---|---|---|---|---|---|
Mean | Standard deviation | Minimum | Maximum | ||||
O 3 | 100 μg/m3 8-hour mean | Indoor close-proximity | 27 | 49.5 | 14.8 | 23.6 | 80.1 |
Outdoor close-proximity | 27 | 55.3 | 16.4 | 21.1 | 90.9 | ||
Background | 7 | 54.1 | 6.8 | 40.5 | 59.2 | ||
NO 2 | 40 μg/m3 annual mean | Indoor close-proximity | 27 | 5.3 | 4.3 | 0.9 | 21.5 |
Outdoor close-proximity | 27 | 5.3 | 3.5 | 0.9 | 15.3 | ||
Background | 7 | 14.8 | 3.8 | 11.5 | 22.1 | ||
SO 2 | 20 μg/m3 24-hour mean | Background | 7 | 4.7 | 3.7 | 1.8 | 12.7 |
PM 10 | 20 μg/m3 annual mean | Background | 7 | 23.9 | 6.8 | 16.5 | 33.4 |