京津冀地区空气质量时空分布特征及其相关性分析

The Analysis of Spatial-Temporal Distribution Characteristics and Correlation on Air Quality in Beijing-Tianjin-Hebei Region

随着城市化的发展,伴随而来的空气质量问题已成为众多环境问题中被广泛讨论与关注的话题。为深入了解空气质量形成机理、探讨空气污染因子的分布特征,以2015年全国监测站点空气质量数据为基础,提取京津冀地区空气质量数据,从时间、空间、时空变化3个角度出发,研究NO2、SO2、PM2.5、CO、O3、PM10六种空气污染因子以及空气质量指数(AQI)的时空分布特征,并分析各个污染因子之间以及与AQI的相关性。分析结果表明:京津冀地区空气质量时空分布特征差异较大,北部地区AQI明显低于南部地区,夏秋两季空气质量普遍好于春冬两季;AQI与NO2、PM2.5、CO呈明显正相关,与O3呈不明显的负相关,O3与AQI相关性较小。分析结果可为京津冀地区空气质量的防控与预测提供理论基础。

As the urbanization in China, air quality gradually become a widely discussing and concerned topic among many environmental issues. In order to find the formation mechanism of air quality and the distribution characteristic of air pollution impact factors, thee data from the national monitoring stations in 2015 is used for analysis. Here we choose three aspects, i.e. temporal, spatial and spatial-temporal, to analyze the distribution of the six air pollution impact factors (NO2, SO2, PM2.5, CO, O3, PM10) and air quality index (AQI). Also, the correlation between factors and AQI are output to present their relationships. The results show that the spatial-temporal distribution characteristics of air quality in the Beijing-Tianjin-Hebei region are quite different. The AQI in the northern region is significantly lower than that the southern region. And air quality is generally much better in summer and autumn. In spring and winter, there was a positive correlation between AQI and NO2, PM2.5, CO. While the AQI has a negative correlation with O3, which it is not significant. The results can provide a theoretical basis for air quality monitoring and prediction in Beijing-Tianjin-Hebei region.