| 
 | Comp.1 | Comp.2 | 
| SO2 | −0.34128 | −0.60183 | 
| NO2 | −0.39993 | 0.356023 | 
| PM10 | −0.47646 | −0.03315 | 
| CO | −0.42283 | −0.38653 | 
| O3 | −0.32287 | 0.589905 | 
| PM2.5 | −0.46211 | 0.112043 |