目的 了解合肥地区大气PM2.5污染特征以及气象影响因素,为合肥市乃至全省大气污染防控提供参考。方法 收集2014~2017年合肥市大气PM2.5质量浓度以及气象监测数据,描述不同监测时间和地点的大气PM2.5浓度及其与气象因素关系。结果 2014~2107年合肥市大气PM2.5年平均浓度分别为81.06 μg/m3、65.64 μg/m3、57.25 μg/m3、55.88 μg/m3,呈现逐年下降趋势;合肥大气PM2.5浓度时间分布呈显著的季节性峰谷特征,即冬季>春季>秋季>夏季,空间上呈现老城区明显高于新城区/郊区;大气PM2.5浓度水平与气温、相对湿度、降水量以及风速呈显著负相关,与气压呈显著正相关。结论 合肥市大气PM2.5污染呈现明显的时空分布特征,气象因素是其分布特征的重要影响因素。
Abstract
Objective To understand the characteristics of atmospheric PM2.5pollution in Hefei City and its meteorological influencing factors, and to provide basis for the prevention and control of air pollution in Hefei City and even the whole province. Methods The atmospheric PM2.5 and meteorological monitoring data in Hefei City from 2014 to 2017 were collected to describe the relationship between the atmospheric PM2.5 concentration and meteorological factors at different monitoring time and location. Results From 2014 to 2107, the average concentration of PM2.5 in Hefei City was 81.06 μg/m3, 65.64 μg/m3, 57.25 μg/m3 and 55.88 μg/m3, respectively,showing a decreasing trend year by year.The temporal distribution of PM2.5 concentration in Hefei City showed a significant seasonal peak-valley characteristic, namely, winter > spring > autumn > summer, and the spatial distribution of PM2.5 concentration in old urban areas was significantly higher than that in new districts/suburbs.The atmospheric PM2.5 concentration was negatively correlated with air temperature, relative humidity, precipitation and wind speed, and positively correlated with air pressure. Conclusion The atmospheric PM2.5 pollution in Hefei City presents obvious spatial and temporal distribution characteristics, and meteorological factors are important factors affecting its distribution characteristics.
关键词
PM2.5 /
分布特征 /
气象因素
Key words
PM2.5 /
Distribution characteristics /
Meteorological factors
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基金
安徽省卫生计生委科研计划项目(2017jk006)
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