PM2.5质量浓度变化特征与交通流的关系——以北京市为例

Correlation Between Characteristics of PM2.5 Mass Concentration and Traffic Flow: a Case Study in Beijing

为分析城市交通运行状况对大气PM2.5质量浓度的影响,针对北京市2014年至2015年12个月的PM2.5质量浓度及交通流量变化情况,基于小波分析的相关理论,对二者的周期性变化特征及其在不同尺度上的相关性进行研究,并进一步分析了特定周期尺度上PM2.5质量浓度变化相对于机动车流量变化的滞后响应现象.研究表明:二者在24 h左右的日周期尺度上显著相关,且PM2.5质量浓度的滞后时间约为9 h.

The objective of this study was to analyze the impacts of urban traffic on PM2. 5 mass concentration. The cyclical characteristics and relevance at different scales between PM2. 5 mass concentration and traffic flow were investigated based on the wavelet theory,which the data of 12 months from 2014 to 2015 in Beijing was adopted. In addition,the response lag time and reasons of PM2. 5 mass concentration from traffic flow for special scales were researched. Results demonstrate that the PM2. 5mass concentration is closely related to traffic flow at daily cycle scales of about 24 hours,and the response lag time of PM2. 5 mass concentration is about 9 hours.