期刊
ENVIRONMENTAL SCIENCE & TECHNOLOGY
卷 55, 期 19, 页码 12871-12881出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.est.1c03618
关键词
airborne microplastics; spatial variation; diurnal variation; air quality index; human exposure
资金
- Second Tibetan Plateau Scientific Expedition and Research Program (STEP) [2019QZKK0903]
- National Natural Science Foundation of China [51979197]
- Public Welfare Technology Research Program of Zhejiang Province [LGF20C030003]
- Key Laboratory of Watershed Sciences and Health of Zhejiang Province [KFKT2020003]
The study found that airborne microplastic concentrations vary in different regions of China and mainly exist in the form of fragments, predominantly made up of polyethylene, polyester, and polystyrene. However, there were no consistent relationships between airborne microplastic concentrations and typical socioeconomic indices.
Airborne microplastics (MPs) are receiving increasing attention due to their ubiquitous nature and the potential human health consequences resulting from inhalation. The limited data for airborne MP concentrations vary widely among studies (similar to 4 orders of magnitude), but comparisons are tenuous due to the inconsistent collection and detection/enumeration methodologies among studies. Herein, we used uniform methodologies to obtain comparable airborne MP concentration data to assess MP exposure intensity in five Chinese megacities. Airborne MP concentrations in northern cities (358 +/- 132 items/m(3)) were higher than those in southeast cities (230 +/- 94 items/m(3)) but of a similar order of magnitude, unlike previous studies. The majority (94.7%) of MPs found in air samples were smaller than 100 mu m, and the main shape of airborne MPs was fragments (88.2%). Polyethylene, polyester, and polystyrene were the dominant polymers comprising airborne MPs. No consistent relationships were detected between airborne MP concentration and typical socioeconomic indices, and the spatial and diurnal patterns for airborne MPs were different from various components of air quality indices (PM2.5, PM10, etc.). These findings reflect the contrasting source/generation dynamics between airborne MPs and other airborne pollutants. Maximum annual exposure of humans to airborne MPs was estimated in the range of 1-2 million/year in these megacities, highlighting the need for additional research examining the human health risks from the inhalation of airborne MPs.
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