Characteristics of water-soluble inorganic ions in PM2.5 and PM 2.5–10 in the coastal urban agglomeration along the Western Taiwan Strait Region, China
2014
Yin, Liqian | Niu, Zhenchuan | Chen, Xiaoqiu | Chen, Jinsheng | Zhang, Fuwang | Xu, Lingling
PM₂.₅and PM₂.₅–₁₀aerosol samples were collected in four seasons during November 2010, January, April, and August 2011 at 13 urban/suburban sites and one background site in Western Taiwan Straits Region (WTSR), which is the coastal area with rapid urbanization, high population density, and deteriorating air quality. The 10 days average PM₂.₅concentrations were 92.92, 51.96, 74.48, and 89.69 μg/m³in spring, summer, autumn, and winter, respectively, exceeding the Chinese ambient air quality standard for annual average value of PM₂.₅(grade II, 35 μg/m³). Temporal distribution of water-soluble inorganic ions (WSIIs) in PM₂.₅was coincident with PM₂.₅mass concentrations, showing highest in spring, lowest in summer, and middle in autumn and winter. WSIIs took considerable proportion (42.2∼50.1 %) in PM₂.₅and PM₂.₅–₁₀. Generally, urban/suburban sites had obviously suffered severer pollution of fine particles compared with the background site. The WSIIs concentrations and characteristics were closely related to the local anthropogenic activities and natural environment, urban sites in cities with higher urbanization level, or sites with weaker diffuse condition suffered severer WSIIs pollution. Fossil fuel combustion, traffic emissions, crustal/soil dust, municipal constructions, and sea salt and biomass burnings were the major potential sources of WSIIs in PM₂.₅in WTSR according to the result of principal component analysis.
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