Analysis of influence factors and characteristics of PM2.5 concentration in a public park and surroundings areas

ZHAO Songting, LI Xinyu,LI Yanming,YU Qiuya

JOURNAL OF NANJING FORESTRY UNIVERSITY ›› 2017, Vol. 41 ›› Issue (02) : 187-192.

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南京林业大学学报（自然科学版）
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JOURNAL OF NANJING FORESTRY UNIVERSITY ›› 2017, Vol. 41 ›› Issue (02) : 187-192. DOI: 10.3969/j.issn.1000-2006.2017.02.028

Analysis of influence factors and characteristics of PM2.5 concentration in a public park and surroundings areas

  • ZHAO Songting1, LI Xinyu1*,LI Yanming1,YU Qiuya2
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Abstract

【Objective】 Evaluate the PM2.5 retention capacity of a public park and discuss the effects of environmental factors on PM2.5 concentrations in order to provide references for pollution control of PM2.5. 【Method】 PM2.5 concentrations within Beixiaohe Park in Beijing, indoor environment(the golf club)and along the roadside(open space)near the park were monitored to compare the differences in PM2.5 concentrations in different environments. 【Result】 ① Diurnal variation in characteristics of PM2.5 concentration in the three environments were the same. The results showed a curve with one “valley” between two “peaks”, indicating that PM2.5 concentrations were high in the morning and at night and low during the daytime. ② When the air was not, or only slightly polluted, PM2.5 concentration within the public park was lower than that indoors and along the roadside by 5.7% and 6.9%, respectively. This showed that the public park had a certain PM2.5 retention capacity. When the air was mid-level polluted, PM2.5 concentration within the public park decreased compared to that indoors and along the roadside by 3.6% and 7.3%, respectively, thus confirming the PM2.5 retention capacity of the public park. When the air was highly polluted, PM2.5 concentration within the public park was slightly lower than that along the roadside by 0.3%, and higher than that indoors by 5.5%. ③ PM2.5 concentration within the public park was negatively correlated with air temperature and wind speed, and positively correlated with air humidity and air pressure. Moreover, PM2.5 concentration along the roadside was positively correlated with vehicle flow rate. 【Conclusion】 When the air was not, or only slightly, or mid-level polluted, the public park had a certain PM2.5 retention capacity, which was influenced by the local climatic conditions.

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ZHAO Songting, LI Xinyu,LI Yanming,YU Qiuya. Analysis of influence factors and characteristics of PM2.5 concentration in a public park and surroundings areas[J]. JOURNAL OF NANJING FORESTRY UNIVERSITY. 2017, 41(02): 187-192 https://doi.org/10.3969/j.issn.1000-2006.2017.02.028

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