Wang Bao Qing, Liu Bo Wei, Niu Hong Hong, Liu Jian Feng, Ren Zi Hui, Chen Rong Hui, Wang Ze Bei and Zhao Jia Jia
To study the characteristic of inorganic elements, carbon species, PAHs of exposure and elements health risk to PM2.5 for urban cyclists in Tianjin. Exposure to PM2.5 samples in cycling were collected during Summer in Tianjin. The non-carcinogenic risk and carcinogenic risk of personal exposure heavy metal in PM2.5 were discussed. The average personal exposure mass concentration of PM2.5 is 340.63 μg/m3 in the weekday, 281.25 μg/m3 at the weekend for cyclists. Enrichment factor analysis showed that Pb, Zn, Ni, and Cu exhibited heavy or extreme contamination, indicating the influence of anthropogenic sources, but K, Ca, Mg, Mn and Fe were minimally enriched and were mainly influenced by crustal sources or lesser anthropogenic sources. The average SOC is 23.33 μg/m3. The proportion of SOC is 34.78% in OC. PAHs in PM2.5, 2-ring and 3-ring compounds were predominant with NAP, PHE and ACY accounting for 25%, 48% and 9% of PAHs for the personal exposure for cyclist, respectively. For non-carcinogenic effects, Hazard index values for all studied metals were lower than the safe level of 1 for cyclists. The carcinogenic risk for Cr and Ni were all below the acceptable level (10-4~10-6). The present study demonstrated the elements health risk in Urban Cyclists. The study may provide a scientific basis for protecting cyclists’s health and safety.
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