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Exposure to fine particulate matter air pollutants (PM_2.5) affects heart rate variability parameters, and levels of serum proteins associated with inflammation, hemostasis and thrombosis. This study investigated sources potentially responsible for cardiovascular and hematological effects in highway patrol troopers.

Nine healthy young non-smoking male troopers working from 3 PM to midnight were studied on four consecutive days during their shift and the following night. Sources of in-vehicle PM_2.5 were identified with variance-maximizing rotational principal factor analysis of PM_2.5-components and associated pollutants. Two source models were calculated. Sources of in-vehicle PM_2.5 identified were 1) crustal material, 2) wear of steel automotive components, 3) gasoline combustion, 4) speed-changing traffic with engine emissions …