John Wiley & Sons, Ltd.

Further insights into the composition, source and toxicity of pahs in size‐resolved PM in a megacity in China

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Concentrations of PM10 and PM2.5 and 16 polycyclic aromatic hydrocarbons (PAHs) were measured. The average concentrations of PM10 and PM2.5 reached 209.75 μg/m3 and 141.87 μg/m3; and those of ΣPAHs were 41.46 ng/m3 for PM10 and 36.77 ng/m3 for PM2.5. The mass ratio concentrations were 219.23 μg/g and 311.01 μg/g in PM10 and PM2.5, respectively. Three sources and their contributions for PAHs were obtained. For individual‐input mode, diesel exhaust source contributed 46.77% (PM10) and 41.12% (PM2.5) for mass concentration; 48.69% (PM10) and 39.47% (PM2.5) for mass ratio concentration while gasoline exhaust source were 31.02% (PM10), 39.47% (PM2.5) and 28.95% (PM10), 36.46% (PM2.5), respectively for each concentration. As to coal combustion source, 22.22% and 19.41% to PM10 and PM2.5 for mass concentration, as well as 22.36% as 15.89% for mass ratio concentration, were observed. For combined‐input mode, same source categories were obtained. Source contributions to PM10 and PM2.5 were diesel exhaust (40.70% and 36.64% for mass concentration; 49.19% and 38.47% for mass ratio concentration), gasoline exhaust (35.09% and 38.47%; 32.50% and 33.43%) and coal combustion (24.21% and 24.89%; 18.31% and18.17%). Source risk assessment showed that vehicle emission was a significant contributor. The findings can help elucidate sources of PAHs and provide good evidence for further applications of Unmix model and deeper studies about PAHs. This article is protected by copyright. All rights reserved

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