From: Spatial association between outdoor air pollution and lung cancer incidence in China
 | PM2.5 | PM10 | SO2 | NO2 | O3 | CO | Smoking |
---|---|---|---|---|---|---|---|
North | |||||||
 Male | 0.083 | 0.070 | 0.093 | 0.036 | 0.083 | 0.065 | 0.143* |
 Female | 0.153 | 0.034 | 0.154* | 0.107 | 0.056 | 0.156 | – |
South | |||||||
 Male | 0.243** | 0.210 | 0.140** | 0.199** | 0.314** | 0.230** | 0.129* |
 Female | 0.110* | 0.101* | 0.098 | 0.103 | 0.071 | 0.113* | – |