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Table 2 Environmental characteristics during the study period

From: The relationship of air pollution and surrogate markers of endothelial dysfunction in a population-based sample of children

 

Mean(SD)

Range

Temperature (°C)

9.35 (4.61)

-1.1-15.4

Humidity (%)

49.45(5.17)

22.10-76.15

Wind speed (Km/h)

10.25 (2.65)

5.41-21.25

Sunlight duration (h)

8.45 (1.15)

7.05-11.10

PM 10 (μg/m3)

120.48 (62.83)

44.58-284.12

CO (ppm)

3.91(2.51)

1.43-10.90

SO 2 (ppb)

43.72(30.56)

5.50-89.9

NO 2 (ppb)

59.39(35.55)

20.60-121.85

O 3 (ppb)

33.60 (10.23)

11.18-56.81

PSI

74.61(30.35)

39-136.2

  1. SD: standard deviation; PM10: particular matter 10 (acceptable level: 50 μg/m3); CO: carbon monoxide (acceptable level: 9 ppm); SO2: sulfur dioxide (acceptable level: 0.03 ppb)
  2. NO2: Nitrogen dioxide (acceptable level: 0.05 ppb); O3: ozone (acceptable level: 0.08 ppb)
  3. PSI; Pollution Standards Index (0-50: Good; 51-100: Moderate; 101-199: Unhealthful; 200-299: Very unhealthful; ≥ 300: Hazardous)