Table 4.
Results of factor analysis of multiple correlations with Varimax rotation among components of DE (transformed by the natural logarithm)ab
| Factor 1 | Factor 2 | Factor 3 | |
| Diesel exhaust | Mine dust | Organic carbon | |
| EVs (% variance explained) | 5.05 (39%) | 2.75 (21%) | 1.54 (12%) |
| EC measurements (μg m−3) | |||
| TEC | 0.82 | 0.45 | 0.07 |
| REC | 0.86 | 0.40 | 0.06 |
| SEC | 0.84 | 0.40 | 0.12 |
| OC measurements (μg m−3) | |||
| TOC | 0.15 | 0.73 | 0.42 |
| ROC | 0.54 | 0.26 | 0.55 |
| SOC | 0.13 | 0.08 | 0.92 |
| Gaseous measurements (ppm) | |||
| NO | 0.78 | 0.17 | 0.31 |
| NO2 | 0.75 | −0.23 | 0.15 |
| CO | 0.65 | −0.19 | 0.08 |
| CO2 | 0.65 | 0.21 | 0.06 |
| Particulate measurements (mg m−3) | |||
| TD | −0.02 | 0.87 | 0.13 |
| RD | 0.36 | 0.81 | −0.08 |
| SCD | 0.67 | 0.26 | 0.17 |
Factor loadings >0.5 are displayed in bold (n = 132 sets of measurements).
a
SMD was not included in this analysis as this agent was missing for three facilities.
b
Only factors with EVs >1 were extracted.