Following by BC, per IQR increase (μg/m3) of NO3−, PM2.5, and OM linked to − 0.79 (− 1.56, − 0.03), − 0.75 (− 1.50, − 0.01), and − 0.73 (− 1.44, − 0.03) g/L decrease of Hb during the third trimester, but not for NH4+, SO42−, and Dust. The gene discussed is GSTM1; the disease is breast cancer.