Particulate Size Distribution in the Haze and Non-Haze Episodes at Shijiazhuang City, China

Zan Hong Wang; Zhi Po Hao

doi:10.4028/www.scientific.net/AMR.955-959.1297

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Particulate Size Distribution in the Haze and Non-Haze Episodes at Shijiazhuang City, China
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Particulate Size Distribution in the Haze and Non-Haze Episodes at Shijiazhuang City, China

Abstract:

Aimed at detecting the particulate size distributions in the typical air pollution city of Shijiazhuang, China, this research collected samples in haze episode and non-haze episode separately and found the difference between the two situations. In non-haze episode, the average size distribution is a U-shape curve both lifting at the size minimum and maximum, with slightly higher frequency in the size below 0.65μm (grade 1 and grade 2); but in haze episode, the frequency of 0.43~0.65μm (grade 2) and 0.65~1.1μm (grade 3) increase evidently. By the correlation coefficient calculation, the mass concentration of PM_0.43~0.65 has strong negative relationship with visibility range, which should be responsible for the low visibility formation. The fitting function demonstrates that the mass concentration of PM_0.43~0.65 must be limited below 0.117 mg/m³ if the visibility range reaches 10km (“medium”), and below 0.006 mg/m³ over 19km (“good”). And there is a inflection point around 0.01 mg/m³ of PM_0.43~0.65 as for the visiblity variation, in which the visiblity range decreases rapidly with slight increase of PM_0.43~0.65 when below 0.001 mg/m³. PM_0.43~0.65 is conclusively regarded as the feature size of particulate responsible for the haze formation in Shijiazhuang, China.