雾炮作业对城市大气颗粒污染物浓度的消减效果

Effect of Fog Guns on Reducing the Concentration of Atmospheric Particulate Pollutants in City

雾炮作业已经被许多城市作为降低空气颗粒物(PM)浓度的常规手段在使用,但其对PM浓度的降低效果如何目前缺少深入研究。文章通过对受雾炮作业影响和不受其影响监测站空气PM浓度对比分析,就不同条件下雾炮作业降低空气PM浓度问题进行了研究。结果表明,雾炮车对降低城市空气中PM浓度效果非常有限,PM10和PM2.5浓度的降幅为0~2%,有效作用时长为10~15 min,在5~10 min时效果较好;雾炮作业对空气中PM2.5的降低率略高于PM10;雾炮作业在污染物浓度上升期、PM10和PM2.5浓度为优和轻度污染、高相对湿度环境下效果更好,原因可能是这些环境条件下有利于雾炮产生的雾滴在空气中的存留。文章研究结果对于规范当前中国城市的雾炮作业具有一定的指导意义。

The fog gun has been used for reducing the concentration of air particulate matter in many cities,but its effect on the reduction of particulate matter concentration was currently lacking in-depth research.By comparing the air particulate matter concentration between the monitoring stations affected by fog gun and those not affected by fog gun,this paper studied whether the concentration of air particulate matter can be reduced by fog gun operation under different conditions.The results showed that the fog gun had almost no effect on the concentration of particulate matter in the urban air,and the concentration of PM10 and PM2.5 decreased by 0~2%.The duration of action was 10~15 min,and the effect was the best at 5~10 minutes.The effect of fog gun operation on reducing PM2.5 pollution concentration was slightly better than that of PM10.Fog gun operation was more effective in the environment with concentration rise period,good and lightly polluted of PM10 and PM2.5 pollution concentration,and high relative humidity,the reason may be that these environmental conditions was conducive to the retention of droplets generated by the fog gun in the air.The study had certain guiding significance for regulating the current fog operation in Chinese cities.