Table 5

Joint analysis of regional air pollution and near-roadway total nitrogen oxides (NOx) on lung function

Effect of regional pollutant†Effect of near-roadway NOx
Regional pollutant% Difference95% CI% Difference95% CI
 O3 (10:00–18:00)−3.24(−5.32 to −1.11)***−1.04(−2.11 to 0.05)
 PM2.5−3.00(−4.76 to −1.21)***−1.07(−2.14 to 0.01)
 PM10−2.24(−4.04 to −0.41)*−1.14(−2.22 to −0.06)*
 NO2−1.22(−4.23 to 1.88)−1.07(−2.15 to 0.02)
 O3 (10:00–18:00)−0.34(−3.21 to 2.63)−1.47(−2.53 to −0.41)**
 PM2.5−2.35(−4.09 to −0.57)**−1.40(−2.46 to −0.34)**
 PM10−2.17(−3.68 to −0.63)**−1.49(−2.54 to −0.43)**
 NO2−0.78(−3.62 to 2.15)−1.46(−2.52 to −0.39)**
  • †See table 2 for adjustment variables (community adjustment not included) and scaling factor for pollutant effects of near-roadway NOx. See footnote to table 4 for scaling factor for regional pollutants.

  • *p<0.05, **p<0.01, ***p<0.005.

  • FEV1, forced expiratory volume in 1 s; FVC, forced vital capacity; NO2, nitrogen dioxide; O3, ozone; PM10 and PM2.5, particulate matter with aerodynamic diameter <10 µm and 2.5 µm.