The rural carbonaceous aerosols in coarse, fine, and ultrafine particles during haze pollution in northwestern China
2016
Zhu, Chong-Shu | Cao, Jun-Ji | Tsai, Chuen-Jinn | Shen, Zhen-Xing | Liu, Sui-Xin | Huang, Ru-Jin | Zhang, Ning-ning | Wang, Ping
The carbonaceous aerosol concentrations in coarse particle (PM₁₀: Dp ≤ 10 μm, particulate matter with an aerodynamic diameter less than 10 μm), fine particle (PM₂.₅: Dp ≤ 2.5 μm), and ultrafine particle (PM₀.₁₃₃: Dp ≤ 0.133 μm) carbon fractions in a rural area were investigated during haze events in northwestern China. The results indicated that PM₂.₅ contributed a large fraction in PM₁₀. OC (organic carbon) accounted for 33, 41, and 62 % of PM₁₀, PM₂.₅, and PM₀.₁₃₃, and those were 2, 2.4, and 0.4 % for EC (elemental carbon) in a rural area, respectively. OC3 was more abundant than other organic carbon fractions in three PMs, and char dominated EC in PM₁₀ and PM₂.₅ while soot dominated EC in PM₀.₁₃₃. The present study inferred that K⁺, OP, and OC3 are good biomass burning tracers for rural PM₁₀ and PM₂.₅, but not for PM₀.₁₃₃ during haze pollution. Our results suggest that biomass burning is likely to be an important contributor to rural PMs in northwestern China. It is necessary to establish biomass burning control policies for the mitigation of severe haze pollution in a rural area.
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