论文部分内容阅读
在空气污染物、气象和道路平均车速的时空特征分析基础上,探讨了临时交通限行措施和气象条件定性分析对空气质量的叠加影响.结果表明,时间上可划分为5个不同污染阶段,空间上表现出自北向南污染加重且空气质量改善由北至南推延的趋势;P3阶段显示交通与气象对空气质量改善的叠加作用;温度高且湿度低时空气质量良好.重污染天气下,临时的交通管制对CO和NO2及时性减排作用显著,对PM2.5有延时削峰作用.“,”We analyzed the spatiotemporal characteristics of air pollutants,meteorology,and average road speed during a heavy haze pollution period;and explored the combined impacts of temporary traffic restrictions and meteorological conditions on air quality.The results showed that five pollution stages were identified with remarkable variation patterns based on the evolution of PM2.5 concentration and weather conditions;and it also showed that the southem sites experienced heavier pollution than the northern sites.Stage P3 exhibited a combined effect of meteorology and traffic restrictions with delayed functions.A good AQI was more likely with higher temperature and lower humidity.Traffic restrictions played visible effects on traffic-related pollutants,like CO and NO2,and delayed peak-clipping effect on PM2.5.