兰州市冬季机动车限行对环境空气质量影响的效果评价

通过观察2014—2016年兰州市环境空气质量变化,特别分析了2016年冬季机动车单双号限行政策对兰州市环境空气质量的影响,初步评价兰州市机动车限行政策效果。结果表明:2014—2016年冬季限行期(11月20日至12月26日)PM_2.5、PM₁₀、SO_2、NO_2、CO年均值均呈现逐年上升现象;2016年冬季限行期PM_2.5、PM₁₀、NO_2日均值和O_38h均值没有明显改善,分时段单双号限行期PM_2.5、NO_2日均值较全天单双号限行期有所升高,冬季单双号限行政策效果有限;气象条件、地理类型、人为活动对兰州市空气质量影响较大。

Evaluation of the motor vehicle restriction policy in winter on the air quality in Lanzhou,China

The study aimed to understand the variation trend of ambient air quality in Lanzhou during 2014-2016,especially the impact of the motor vehicle restriction policy in winter 2016 to preliminarily evaluate the motor vehicle restriction in Lanzhou.The results showed that the means of concentration of PM2.5 ,PM10 ,SO2 ,NO2 and CO presented an upward trend in the period of the traffic restrictions based on even-and odd-numbered license plates(November 20th-December 26th)during 2014-2016.The change of daily concentration of PM2.5 ,PM10 ,NO2 and the concentration of O3-8 h was not obviously changed in the period of the traffic restriction based on even-and odd-numbered license plates in winter 2016.The daily concentration of PM2.5 ,NO2 in the period of the traffic restriction based on even-and odd-numbered license plates from 7:00 to 20:00 increased compared with that from 0:00 to 24:00.The effect of the motor vehicle restriction in winter 2016 in Lanzhou was limited.Meteorological conditions,geographical types and human activities had a greater impact on air quality in Lanzhou.