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杨蓉,叶勇军,蒋复量,王淑云.衡阳市夏秋季大气颗粒物污染特征[J].南华大学学报(自然科学版),2014,28(3):103~107.[YANG Rong,YE Yong-jun,JIANG Fu-liang,WANG Shu-yun.Characterization of Atmospheric Particulates inHengyang During Summer and Autumn[J].Journal of University of South China(Science and Technology),2014,28(3):103~107.]

衡阳市夏秋季大气颗粒物污染特征

Characterization of Atmospheric Particulates inHengyang During Summer and Autumn

投稿时间：2014-01-26

DOI：

中文关键词: 衡阳 PM2.5 PM₁₀ 有效性验证

英文关键词:Hengyang PM2.5 PM₁₀ effectiveness verification

基金项目:衡阳市科技计划基金资助项目(2012KJ26)

作者	单位
杨蓉	南华大学环境保护与安全工程学院,湖南衡阳 421001
叶勇军	南华大学环境保护与安全工程学院,湖南衡阳 421001
蒋复量	南华大学环境保护与安全工程学院,湖南衡阳 421001
王淑云	南华大学环境保护与安全工程学院,湖南衡阳 421001

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中文摘要:

为了得到衡阳市区大气颗粒物的污染水平及分布特征,本文根据衡阳城区特点及人员活动规律,以2013年8月25～27日和11月27～29日作为夏秋季代表日,在人员活动最为集中的交通主干道附近进行了定点实地测量,包括作为参照的南华大学共设6测点.结果表明,秋季PM2.5浓度明显高于夏季,数浓度前者为后者的2.27～3.13倍,质量浓度前者为后者的1.74～3.74倍.从整体特征而言,颗粒直径基本在5 μm以下,其中PM2.5数量在PM₁₀中占比达99.5左右,而PM1.0又约占到了PM2.5的97%；早8点和晚8点左右是人员户外活动高峰期,也是PM2.5浓度最高的时段,中午和午后水平较低,夏季PM2.5和PM₁₀质量浓度均在国家二级标准限值以内,秋季部分区域超出限值,同时对各测点进行了颗粒物污染程度排序.本文还通过实验发现,洒水对降低PM2.5和PM₁₀的浓度都是有效的,有效时段为洒水后第11至24小时.

英文摘要:

In order to understand the pollution level of atmospheric particulates and the characteristics of distribution in Hengyang,field measurements were carried out during August 25~27 and November 27~29 of 2013.Five measuring points were selected along the side of the main road,and one point was at the University of South China.The result showed that the concentration of PM2.5 was significantly higher in autumn than in summer.The numerical density of PM2.5 in autumn was 2.27~3.13 times and the mass concentration was 1.74~3.74 times higher in autumn than in summer.In general,the size of particles was almost below 5 μm in diameter,and the dominant particles were less than 1 μm.The PM2.5 concentration was highest at 8 am and 8 pm,but was lowest at noon and in the afternoon.Mass concentrations of PM2.5 and PM₁₀ were less than the national standard limits in Summer,but some areas beyond the limits in autumn.Then the six measuring points were ranked according to the degree of pollution.This study provides evidence that watering can reduce PM2.5 and PM₁₀ concentration and the best result of particle reduction is between 11 to 24 hours after watering.

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