Spatiotemporal dynamics of atmospheric PM2.5 and PM10 and its influencing factors in Nanchang, China

doi:10.13287/j.1001-9332.201701.025

Abstract

Abstract: PM_2.5 and PM₁₀ have become the primary pollutants of most cities in China. Atmospheric PM_2.5 and PM₁₀ mass concentrations, meteorological factors, traffic flow from 2013 to 2015 in Nanchang were analyzed. Spatiotemporal dynamic pattern of atmospheric particulate matter pollution and the effect of weather and traffic on particle concentration change were discussed in this paper. The results showed that PM_2.5(70.92 μg·m^-3 in 2013 > 53.70 μg·m^-3 in 2014 ＞ 43.65 μg·m^-3 in 2015) and PM₁₀(119.72 μg·m^-3 in 2013 ＞ 86.11 μg·m^-3 in 2014 ＞ 73.32 μg·m^-3 in 2015) concentrations decreased gradually from 2013 to 2015. In addition, low concentrations of PM_2.5 and PM₁₀ in summer (average PM_2.5 concentration 36.74 μg·m^-3, average PM₁₀ concentration 69.20 μg·m^-3) but high concentrations in winter (average PM_2.5 concentration 74.29 μg·m^-3, average PM₁₀ concentration 111.64 μg·m^-3) were observed. Moreover, PM_2.5 and PM₁₀ concentrations changed with the urban-rural gradient, decreasing from the city center to suburb. The ratio of PM_2.5/PM₁₀(0.595 ＞ 0.584 ＞ 0.557) decreased year by year from 2013 to 2015 and was higher in the city center area than in the edge of city. PM_2.5 and PM₁₀ concentrations were affected by various meteorological factors and significantly related to air pressure, temperature, relative humidity, wind speed, precipitation and sunshine time. The influence of meteorological factors differed on PM_2.5 and PM₁₀ concentrations. Traffic flow significantly increased the surrounding PM_2.5 concentration, but not PM₁₀ concentration.

Key words: PM₁₀, PM₂₅, meteorological factors, traffic flow

SU Wei, ZHANG Shuai-jun, LAI Xin-yun, GU Xin-ren, LAI Sheng-nan, HUANG Guo-xian, ZHANG Zhi-jian, LIU Yuan-qiu. Spatiotemporal dynamics of atmospheric PM_2.5 and PM₁₀ and its influencing factors in Nanchang, China[J]. Chinese Journal of Applied Ecology, 2017, 28(1): 257-265.

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Spatiotemporal dynamics of atmospheric PM_2.5 and PM₁₀ and its influencing factors in Nanchang, China

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