Table 1 Components included in the analysis In-vehicle concentrations of the elemental components of PM2.5 and gaseous co-pollutants included in the analysis (n = 36 samples): Arithmetic average, standard deviation and correlation (Spearman-Rho) to PM2.5Mass and PM2.5Lightscatter. *) p < 0.05.
Component | Average | Standard Deviation | Correlation to PM2.5Mass | Correlation to PM2.5Lightscatter |
|---|---|---|---|---|
Benzene (ppb) | 3.73 | 2.9 | 0.50 * | 0.31 * |
Aldehydes (μg/m3) | 34.6 | 14.9 | 0.34 * | 0.52 * |
CO (ppm) | 2.6 | 1.1 | 0.52 * | 0.52 * |
Aluminum (Al, ng/m3) | 66.0 | 54.5 | 0.58 * | 0.31 * |
Silicon (Si, ng/m3) | 240.0 | 542.0 | 0.66 * | 0.23 |
Sulfur (S, ng/m3) | 1703.0 | 812.0 | 0.58 * | 0.88 * |
Calcium (Ca, ng/m3) | 48.2 | 33.5 | 0.37 * | 0.22 |
Titanium (Ti, ng/m3) | 11.7 | 10.0 | 0.41 * | 0.15 |
Chromium (Cr, ng/m3) | 2.1 | 1.7 | 0.51 * | 0.32 * |
Iron (Fe, ng/m3) | 371.0 | 352.0 | 0.71 * | 0.33 * |
Copper (Cu, ng/m3) | 33.1 | 18.8 | 0.16 | 0.50 * |
Selenium (Se, ng/m3) | 12.6 | 1.2 | 0.38 * | 0.26 |
Tungsten (W, ng/m3) | 5.6 | 5.9 | 0.37 * | 0.39 * |
PM2.5Mass (μg/m3) | 23.0 | 8.0 | 1 | 0.71 * |
PM2.5Lightscatter (μg/m3) | 24.1 | 13.5 | 0.71 * | 1 |