Factor loading of mean annual levels of criteria air pollutants in Taiwan, 1994
| Factor 1 | Factor 2 | |
| Eigenvalue (% variance) | 2.92 (58.3) | 1.31 (26.2) |
| Factor loading | ||
| CO | 0.927 | 0.127 |
| NOx | 0.911 | 0.278 |
| O3 | −0.921 | 0.038 |
| SO2 | 0.268 | 0.827 |
| PM10 | −0.037 | 0.901 |
| Factor | Traffic-related | Fossil fuel combustion related |
Two factors have eigenvalues of >1 and account for 84.5% of variance
CO: carbon monoxide
NOx: nitrogen oxides
O3: ozone
SO2: sulphur dioxide
PM10: particulate matter with a 50% cut-off aerodynamic diameter of 10 µm