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Table 2 Pollutant levels and climatologically data in the studied zones during all seasons; Salamanca, Guanajuato, 2004 - 2005

From: Impact of air pollution on pulmonary function and respiratory symptoms in children. Longitudinal repeated-measures study

Variables   Spring Summer Fall Winter
O3 (μg/m3) School 1 28.7 ± 2.7 28.1 ± 0.7 15.4 ± 0.1 20.2 ± 0.7
  School 2 17.6 ± 0.3 23.6 ± 1.6 39.8 ± 1.3 33.2 ± 1.9
  p* 0.001 0.001 0.001 0.001
SO2 (μg/m3) School 1 31.2 ± 1.1 32.1 ± 0.7 27.2 ± 0.7 25.8 ± 0.4
  School 2 23.9 ± 1.1 23.0 ± 1.4 26.8 ± 1.6 35.6 ± 1.9
  p* 0.002 0.001 0.01 0.001
CO (ppm) School 1 0.84 ± 0.09 0.37 ± 0.07 0.26 ± 0.01 0.81 ± 0.09
  School 2 1.4 ± 0.4 1.9 ± 0.9 2.4 ± 1.4 5.8 ± 0.9
  p* 0.001 0.001 0.001 0.001
NO (μg/m3) School 1 18.4 ± 1.9 11.1 ± 0.4 4.7 ± 1.9 15.6 ± 1.3
  School 2 18.5 ± 1.7 6.6 ± 1.1 126.0 ± 7.7 65.4 ± 15.1
  p* 0.75 0.015 0.001 0.001
NO2 (μg/m3) School 1 66.4 ± 4.2 12.4 ± 0.2 7.4 ± 0.2 14.9 ± 1.9
  School 2 6.3 ± 1.5 2.6 ± 0.6 51.6 ± 17.1 28.7 ± 3.0
  p* 0.001 0.024 0.001 0.002
NOx (μg/m3) School 1 81.6 ± 6.9 19.6 ± 0.5 11.5 ± 0.2 27.8 ± 2.0
  School 2 24.6 ± 2.5 6.9 ± 1.3 156.1 ± 9.3 92.2 ± 21.4
  p* 0.001 0.018 0.001 0.001
PM10 (μg/m3) School 1 77.9 ± 2.9 60.7 ± 1.4 41.7 ± 1.0 60.8 ± 3.3
  School 2 53.1 ± 24.4 11.3 ± 3.2 7.4 ± 0.7 77.9 ± 2.9
  p* 0.001 0.001 0.013 0.001
Temperature (°C) School 1 19.3 ± 0.1 20.9 ± 0.1 20.2 ± 0.4 16.2 ± 0.7
  School 2 15.4 ± 0.5 16.8 ± 0.1 16.5 ± 0.1 12.1 ± 0.5
  p* 0.001 0.028 0.007 0.001
Relative humidity (%) School 1 54.0 ± 0.9 52.9 ± 0.7 74.6 ± 0.1 65.7 ± 0.6
  School 2 50.9 ± 1.2 50.4 ± 2.3 74.0 ± 0.8 66.4 ± 2.5
  p* 0.02 0.078 0.129 0.001
  1. *p value for differences between schools