Skip to main content

Table 1 Descriptive statistics of the exposure estimate distributions in the 382 census tracts in the Greater Vancouver Regional District study area

From: Spatial variations in estimated chronic exposure to traffic-related air pollution in working populations: A simulation

Exposure estimates Annual average hourly NO2 (μg/m3)
Descriptive statistics 10th
percentile
(n = 382)
50th
percentile
(n = 382)
90th
percentile
(n = 382)
Range
(10th – 90th)
Total exposure Mean 18.87 20.96 23.89 5.02
  Median 18.61 20.62 23.58  
  st. deviation 3.24 3.48 3.49  
Home indoor Mean 14.88 15.39 15.89 1.01
  Median 14.48 15.00 15.47  
  st. deviation 3.50 3.63 3.76  
Work indoor Mean 3.79 6.40 10.60 6.81
  Median 3.72 6.39 10.52  
  st. deviation 0.37 0.64 0.76  
Other indoor Mean 1.76 2.09 2.44 0.68
  Median 1.67 1.99 2.35  
  st. deviation 0.43 0.50 0.58  
Outdoor Mean 2.36 2.78 3.24 0.88
  Median 2.39 2.82 3.28  
  st. deviation 0.36 0.42 0.49  
In-vehicle to work Mean 0.19 0.54 1.06 0.87
  Median 0.16 0.52 0.99  
  st. deviation 0.15 0.24 0.36  
In-vehicle other Mean 1.32 1.53 1.76 0.44
  Median 1.33 1.54 1.77  
  st. deviation 0.18 0.21 0.25