Table 3– Distribution of all available exposure metrics (air pollutants and traffic variables) by study
NMeansdMin.25th percentile50th percentile75th percentileMax.Interquartile range
ECRHS
 PM2.5 μg·m−3158216.136.028.1710.2616.8917.9634.377.70
 PM2.5(abs) 10−5 m−113202.010.910.831.151.822.705.251.55
 PM10 μg·m−3158325.889.8111.9116.7924.4429.3855.1712.60
 PMcoarse μg·m−3158210.204.693.896.408.8011.3125.374.91
 NO2 μg·m−3158228.9515.430.0018.7626.5437.47115.5218.71
 NOx μg·m−3158250.5130.430.0031.4843.0365.93223.0734.45
 Traffic on nearest road#15165538116810.0050080070801431566580
 Traffic load15161.443.270.000.000.001.6656.501.66
 Back-extrapolated PM10 to follow-up+ μg·m−3158227.045.5216.3022.3127.2030.5247.118.22
 Back-extrapolated NO2 to follow-up+ μg·m−3121541.5615.3313.5129.3039.2850.80120.6821.51
NSHD
 PM2.5 μg·m−37519.520.998.178.729.4810.1813.491.45
 PM2.5(abs) 10−5 m−17511.050.240.830.880.981.143.200.26
 PM10 μg·m−375115.732.0911.7914.6715.7316.5426.201.88
 PMcoarse μg·m−37516.370.925.575.786.046.569.710.77
 NO2 μg·m−375122.397.1312.9316.6421.8326.6761.9910.03
 NOx μg·m−375137.5414.1919.7527.2236.0544.35145.4317.13
 Traffic on nearest road#75112394091500500500500762240.00
 Traffic load7510.270.910.000.000.000.0010.000.00
 Back-extrapolated PM10 to baseline+ μg·m−374822.002.8216.3720.6521.9723.2836.382.63
 Back-extrapolated NO2 to baseline+ μg·m−374826.388.4014.6420.1325.7431.5570.1811.42
SALIA
 PM2.5 μg·m−358017.761.3315.9016.8717.2618.5321.901.70
 PM2.5(abs) 10−5 m−15801.430.410.971.181.301.583.390.40
 PM10 μg·m−358026.722.0623.8825.4026.1627.4733.472.07
 PMcoarse μg·m−35809.371.572.858.508.8410.0814.791.58
 NO2 μg·m−358027.627.5219.6622.6724.2430.7270.348.05
 NOx μg·m−358044.1618.9823.8831.8635.4252.60124.3420.74
 Traffic on nearest road#58016423637500500500500277980.00
 Traffic load5800.722.010.000.000.000.3215.80.32
 Back-extrapolated PM10 to baseline+ μg·m−358047.688.0232.2439.2349.8452.7965.0613.56
 Back-extrapolated NO2 to baseline+ μg·m−358035.9711.5220.2627.5633.3241.6084.1414.04
SAPALDIA
 PM2.5 μg·m−372916.781.6212.3616.2416.7817.3823.481.13
 PM2.5(abs) 10−5 m−17291.930.380.911.681.962.203.230.52
 PM10 μg·m−372923.162.5617.6022.3223.2924.6131.692.29
 PMcoarse μg·m−37296.491.244.275.536.487.3910.391.86
 NO2 μg·m−372926.177.656.8722.6626.6430.5956.307.93
 NOx μg·m−372942.0214.714.0336.5542.6449.40112.1612.85
 Traffic on nearest road#72915412967001251584224241584
 Traffic load7291.141.770.000.000.211.7510.31.1.75
 Back-extrapolated PM10 to baseline+ μg·m−372646.184.4533.8244.4245.5148.4261.904.00
 Back-extrapolated NO2 to baseline+ μg·m−372745.8412.2811.4639.6544.8251.5796.4011.93
  • PM2.5: particulate matter with a diameter of 2.5 μm or less; PM2.5(abs): absorbance of particulate matter with a diameter of 2.5 μm; PM10: particulate matter with a diameter of 10 μm or less; PMcoarse: coarse fraction of PM2.5 to PM10; NOx: nitrogen oxides. #: cars per day; : traffic load on nearest major road within 100 m buffer presented in millions; +: only back extrapolation to follow-up in 2001 was possible for ECRHS data; back extrapolation to baseline was possible for NSHD (1999), SALIA (1985–1994) and SAPALDIA (1991).