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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.

From: Cardiovascular effects in patrol officers are associated with fine particulate matter from brake wear and engine emissions

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