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首页> 外文期刊>The Science of the Total Environment >Traffic-related air pollution modeling during the 2008 Beijing Olympic Games: The effects of an odd-even day traffic restriction scheme
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Traffic-related air pollution modeling during the 2008 Beijing Olympic Games: The effects of an odd-even day traffic restriction scheme

机译：2008年北京奥运会期间与交通有关的空气污染建模：奇偶交通限制计划的影响

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摘要

An integrated urban air quality modeling system was applied to assess the effects of a short-term odd-even day traffic restriction scheme (TRS) on traffic-related air pollution in the urban area of Beijing (UAB) before, during and after the 2008 Olympic Games. Using traffic flow data retrieved from an on-line traffic monitoring system, concentration levels of CO, PM_(10), NO_2 and O_3 on the 2nd, 3rd. 4th Ring Roads (RR) and Linkage Roads (LRs), the main roads distributed around the UAB, were predicted for the pre- (10th-l 9th, July), during- (20th July-20th September) and post-TRS (21st-30th, September) periods. A widely used statistical framework for model evaluation was adopted, the dependences of model performance on time-of-the-day and on wind direction were investigated, and the model predictions turned out reasonably satisfactory. Results showed that daily average concentrations on the 2nd, 3rd, 4th RR and LRs decreased significantly during the TRS period, by about 35.8,38.5,34.9 and 35.6% for CO. about 38.7,31.8.44.0 and 34.7% for PM,o, about 30.3.31.9. 32.3 and 33.9% for NO_2, and about 36.7,33.0,33.4 and 34.7% for O_3, respectively, compared with the pre-TRS period. Hourly average concentrations were also reduced significantly, particularly for the morning and evening peaks for CO and PMio, for the evening peak for NO_2, and for the afternoon peak for O_3. Consequently, both the daily and hourly concentration level of CO, PM_(10), NO_2 and O_3 conformed to the China National Ambient Air Quality Standards Grade II during the Games. In addition, notable reduction of concentration levels was achieved in different regions of Beijing, with the traffic-related air pollution in the downwind northern and western areas relieved most significantly. The TRS policy was therefore effective in alleviating traffic-related air pollution and improving short-term air quality in Beijing during the Games.
机译：在2008年之前，期间和之后，采用了集成的城市空气质量建模系统来评估短期奇偶日交通限制计划（TRS）对北京市区（UAB）中与交通有关的空气污染的影响奥运会。使用从在线交通监控系统获取的交通流量数据，在第二，第三天分别测量CO，PM_（10），NO_2和O_3的浓度水平。预测在UAB周围分布的主要道路第四环路（RR）和连接道路（LR），在TRS之前（7月20日至9月9日），TRS期间（7月20日至9月20日）（ 9月21日至30日）。采用了广泛使用的用于模型评估的统计框架，研究了模型性能对时刻和风向的依赖性，并且模型预测结果令人满意。结果表明，在TRS期间，第二，第三，第四次RR和LR的日平均浓度显着下降，CO分别下降了约35.8、38.5、34.9和35.6％，CO，PM，o分别约为38.7、31.8.44.0和34.7％。大约30.3.31.9。与TRS之前的时期相比，NO_2的含量分别为32.3％和33.9％，O_3的含量分别约为36.7、33.0、33.4和34.7％。每小时平均浓度也显着降低，特别是在CO和PMio的早晚高峰，NO_2的晚高峰和O_3的下午高峰。因此，在奥运会期间，CO，PM_（10），NO_2和O_3的每日和每小时浓度水平均符合中国国家环境空气质量标准II级。此外，北京不同地区的浓度水平显着降低，顺风北部和西部地区与交通有关的空气污染得到最大程度的缓解。因此，TRS政策有效地减轻了北京奥运会期间与交通有关的空气污染并改善了短期空气质量。

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