重庆市典型道路机动车排放NO<sub>2</sub>污染特征

李永锋; 马杰; 王胜蓝; 蒋月; 杨海蓉; 张潇天; 王俭

doi:10.12153/j.issn.1674-991X.20210379

重庆市典型道路机动车排放NO₂污染特征

doi: 10.12153/j.issn.1674-991X.20210379

重庆市生态环境监测中心

基金项目: 重庆市生态环境局科技项目（2019年打赢蓝天保卫战课题）

详细信息

作者简介:
李永锋(1980—)，男，工程师，主要研究方向为环境监测和数据评价，1160334996@qq.com

通讯作者:
王俭（1984—），男，正高级工程师，主要研究方向为环境监测和污染防治，wangjianmm999@163.com

中图分类号: X51
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出版历程
- 收稿日期: 2021-08-03

Research on the pollution characteristics of NO₂ emitted by motor vehicles on typical roads in Chongqing

Chongqing Ecology and Environment Monitoring Center

摘要

摘要:
为研究城市道路机动车排放NO₂浓度的变化，选取重庆市大渡口区4条道路进行1周的自动在线监测，结合道路RFID基站的车流量及车型信息，分析NO₂浓度与车流变化特征及其相关性。结果表明：4条道路NO₂日均浓度为29~57 μg/m³，均低于GB 3095—2012《环境空气质量标准》二级标准限值；NO₂小时浓度变化趋势为20:00左右峰值浓度明显高于08:00峰值浓度，最小值出现在14:00左右。4条道路车流量呈明显的早晚高峰趋势，周末的车流量比工作日平均车流量下降20%~40%，出现比例较高的车型为小型客车、出租车、公交车、轻型货车。NO₂小时浓度变化与车流量变化规律基本一致，均呈现较为明显的早晚高峰趋势，但晚高峰时段NO₂峰值浓度的出现稍微滞后于车流量峰值的出现。
- 道路交通 /
- 二氧化氮（NO₂） /
- 污染特征 /
- 车流量
Abstract:
To study the change of the concentrations of NO₂ emitted by motor vehicles on the urban road, 4 roads in Dadukou District, Chongqing Municipality were selected for one-week automatic online monitoring. Combined with the information of traffic flow and vehicles collected by RFID Base Stations on the road, the change features of NO₂ concentration and traffic flow, as well as their correlation were analyzed. The results showed that the daily averaged concentration of NO₂ on 4 roads was 29-57 μg/m³, all lower than Level 2 standard threshold of Ambient Air Quality Standard (GB 3095-2012). The hourly concentration of NO₂ peak value at about 20:00 was significantly higher than that at 08:00, with the minimum value appearing at around 14:00. The traffic flow of 4 roads had the obvious trend of morning and evening rush hours. The traffic flow at weekends was 20%-40% lower than the average traffic flow on workdays. The vehicle models with a high proportion included minibus, taxi, bus, and light truck. The change of the hourly concentration of NO₂ was consistent with that of traffic flow. Both of them had the obvious trend of morning and evening rush hours, but during the evening rush hours, the peak concentration of NO₂ appeared slightly later than the peak value of traffic flow.
- road traffic /
- nitrogen dioxide（NO₂） /
- pollution characteristics /
- traffic flow

HTML全文

图 1 道路交通空气监测点位示意

Figure 1. Schematic diagram of road traffic air quality monitoring sites

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图 2 4条道路NO₂日均浓度变化特征

Figure 2. Variation characteristics of daily mean concentration of NO₂ on 4 roads

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图 3 4条道路NO₂小时浓度变化特征

Figure 3. Variation characteristics of NO₂ hourly concentration on 4 roads

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图 4 4条道路小时车流量变化趋势

Figure 4. Hourly traffic flow variation trend on 4 roads

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图 5 4条道路小时车型占比变化趋势

Figure 5. Hourly vehicle type variation trend on 4 roads

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图 6 4条道路小时车流量与NO₂浓度相关性

Figure 6. Correlation between hourly traffic flow and NO₂ concentration on 4 roads

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图 7 4条道路累计车流量与NO₂日均浓度相关性

Figure 7. Correlation between daily averaged NO₂ concentration and cumulative vehicle flow of 4 roads

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表 1 4条道路日均车流量对比

Table 1. Comparison of daily traffic flow of 4 roads 辆　

道路	星期一	星期二	星期三	星期四	星期五	星期六	星期日
西城大道	13 030	12 997	12 896	12 862	12 881	12 847	12 301
钢花路	9 736	9 476	9 707	9 898	9 581	8 966	8 755
双山路	4 230	4 231	4 118	4 097	4 314	3 856	3 789
文体路	3 683	3 597	3 506	3 523	3 676	2 969	2 948

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