For children who were minor allele carriers for both GSTP1 SNPs (rs1138272 and rs1695; Ntotal = 728) there were statistically significant associations between NO2 and current asthma (OR = 2.37; 95% CI: 1.31, 4.34 per 10 μg/m3 NO2; p = 0.005) and ever asthma (OR = 1.57; 95% CI: 1.04, 2.37; p = 0.032); analyses in remaining GSTP1 rs1138272*rs1695 strata (rs1138272 TT/TC and rs1695 AA; rs1138272 CC and rs1695 GG/GA; rs1138272 CC and rs1695 AA) were nonsignificant (data not shown). This evidence concerns the gene GSTP1 and asthma.