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Table 2 Distribution of PM, NO 2 and traffic exposure in rural and in urban areas

From: Air pollution and subclinical airway inflammation in the SALIA cohort study

 

Total area (N = 402)

Rural area (N = 190)

Urban area (N = 212)

p-Valuee

Variable

Median (IQR)

Median (IQR)

Median (IQR)

 

Nearest monitoring stations (Five-year mean) a

    

NO2 [μg/m3]

30.8 (13.2)

20.2 (0)

33.4 (2.6)

< 0.0001

PM10 [μg/m3]

25.3 (3)

25.2 (0)

28.2 (3.4)

< 0.0001

LUR-modelled exposure b

    

NO2 [μg/m3]

26.0 (9.42)

23.0 (2)

31.9 (10.3)

< 0.0001

PM10 [μg/m3]

26.4 (2.26)

25.6 (0.89)

27.7 (2.7)

< 0.0001

PM2.5 [μg/m3]

17.4 (2.06)

17.0 (0.42)

18.9 (1.7)

< 0.0001

PM2.5 absorbance [10−5 m−1]

1.38 (0.44)

1.20 (0.13)

1.62 (0.47)

< 0.0001

Traffic loadc [vehicle*km/day]

0 (990)

0 (0)

0 (1330)

0.0003

 

%

%

%

 

Distance < 100 md

19.1

14.7

23.1

0.0331 f

  1. aFive-year mean of 2003 – 2007 from the nearest monitoring station of the State Environment Agency covering the area in an 8-km grid (1 station in Borken, 5 stations in Ruhr-Area).
  2. bLand-use regression modelled exposure using data from a measurement campaign (2008/2009) gained in the framework of the EU-ESCAPE study for assessment of individual long-term exposure (Modelling based on the measurements from 40 stations for NO2 and 20 stations for PM).
  3. cTraffic volume within a 100 m buffer around the home, calculated as the sum of the products of the number of vehicles from all roads with ≥ 5,000 vehicles per day multiplied with the street section length in the 100 m buffer.
  4. dDistance of residential address < 100 m from major road with more than 10,000 vehicles per day.
  5. ep-Value of Wilcoxon test for the difference of means between rural and urban area.
  6. fp-Value of χ2-test for the difference between rural and urban area.
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Immunity & Ageing

ISSN: 1742-4933

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