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Table 1 Air pollutants, climatic variables and traffic density during the study period

From: Traffic-related air pollution and respiratory symptoms among asthmatic children, resident in Mexico City: the EVA cohort study

 

Mean (SD)

Interquartile Range

1 hr maximum, O3 (ppb)

86.5(34.4)

48.0

1 hr maximum, NO2(ppb)

68.6(25.8)

34.0

24-hr average, PM2.5 (μg/m3)

27.8(14.9)

17.5

PM2.5 absorbance (10 -5m-1)&

10.3(4.9)

8.5

Temperature minimum, (°C)

11.3(3.1)

4.2

Humidity minimum

34.8(11.6)

18.1

Traffic density, hourly average†

  

   A

423.0(303.1, 1840.2)

1537.1

   B

30.1(13.1, 512.5)

499.5

   C

20.1(14.2, 144.5)

130.3

Distance from the main avenue to the child's residence(m) †

147.0(67.9, 279.9)

212.0♣

  1. † Median (Q25, Q75). Definition: Standard Deviation (SD). A: Private cars (Gasoline); B: Small buses for public transportation (Gasoline or natural gas); C: School buses, other buses, pick up trucks and heavy trucks (Diesel); Ozone(O3), Nitrogen dioxide(NO2) and particles less than 2.5 μg/m3 in diameter(PM2.5),
  2. &Light absorption in inverse meters.
  3. ♣ 95% of the children lived less than 500 m from the main avenue
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Respiratory Research

ISSN: 1465-993X

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