贵阳市道路汽车尾气NO2、NO及CO调查

目的:探讨汽车尾气对室外空气质量的影响,为相关部门制定相应措施提供参考.方法:选择贵阳市不同车流量的交通路口A和B作为交通污染点,校园内C点为清洁对照点,采用电子直读式检测仪在3个时间点对3个监测点的NO2、NO、CO浓度进行监测,结果评价均参照《环境空气质量标准》(GB3095-1996).结果:A、B监测点的NO2...

An Investigation on Road Traffic Pollution in Guiyang City

Objective: To study the effect of automobile exhaust on air quality in Guiyang,and so as to provide reference evidence for relevant department to establish corresponding measures.Methods: Two different traffic intersections A and B with different vehicle flows were selected as traffic pollution observation areas,and area C on the campus with almost no vehicle passing by was selected as clean control.Direct-Reading Electron Pocket detectors were used to monitor NO₂,NO and CO concentrations during three different periods（7∶30⁸∶30 in the morning,12∶00¹3∶00 at noon,17∶00¹8∶00 in the afternoon） for four days.The results were evaluated according to 《Ambient Air Quality Standard》（GB3095-1996）.Results: Over standard rates of NO₂ in both A and B areas were 100% and their average exceeding times were 1.90 and 1.58 respectively.Over standard rates of CO were 0 and NO was not detectable in area A and B.In area C,NO₂ was detected twice in the 12 tests and didn’t exceed the standard,and NO and CO weren’t detected.Concentrations of NO₂ and CO in both areas A and B tested in every time point were higher than those in area C（P<0.05）.NO₂ levels were positively correlated with CO levels in different periods in all monitoring sites（r=0.819,P<0.01）.Conclusion: NO₂ is the main component in over standard automobile exhaust and exceeds the standard during all periods in areas A and B.