Department of Public Health, China Medical University, Taichung, Taiwan.
Research Center for Environmental Changes, Academia Sinica, Taipei, Taiwan.
Sci Rep. 2022 Mar 14;12(1):4343. doi: 10.1038/s41598-022-08096-1.
Particulate lead (Pb) is a primary air pollutant that affects society because of its health impacts. This study investigates the source sectors of Pb associated with ambient fine particulate matter (PM) over central-western Taiwan (CWT) with new constraints on the Pb-isotopic composition. We demonstrate that the contribution of coal-fired facilities is overwhelming, which is estimated to reach 35 ± 16% in the summertime and is enhanced to 57 ± 24% during the winter monsoon seasons. Moreover, fossil-fuel vehicles remain a major source of atmospheric Pb, which accounts for 12 ± 5%, despite the current absence of a leaded gasoline supply. Significant seasonal and geographical variations in the Pb-isotopic composition are revealed, which suggest that the impact of East Asian (EA) pollution outflows is important in north CWT and drastically declines toward the south. We estimate the average contribution of EA outflows as accounting for 35 ± 15% (3.6 ± 1.5 ng/m) of the atmospheric Pb loading in CWT during the winter monsoon seasons.
颗粒物中的铅（Pb）是一种主要的空气污染物，因其对健康的影响而对社会造成影响。本研究通过对 Pb 同位素组成的新约束，调查了与台湾中西部地区（CWT）环境细颗粒物（PM）相关的 Pb 的源部门。研究结果表明，燃煤设施的贡献是压倒性的，在夏季估计达到 35±16%，在冬季季风季节增强至 57±24%。此外，尽管目前没有含铅汽油供应，但化石燃料车辆仍然是大气 Pb 的主要来源，占 12±5%。揭示了 Pb 同位素组成的显著季节性和地理变化，表明东亚（EA）污染流出物的影响在台湾北部很重要，而在南部则急剧下降。我们估计，在冬季季风季节，EA 流出物的平均贡献占 CWT 大气 Pb 负荷的 35±15%（3.6±1.5 ng/m）。
