Impact of Temporary Freeway Closure on Regional Air Quality: A Lesson from Carmageddon in Los Angeles, United States
Impact of Temporary Freeway Closure on Regional Air Quality: A Lesson from Carmageddon in Los Angeles, United States
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DOI：
10.1021/es505185c
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发表时间：
2015-03-03
影响因子：
11.4
通讯作者：
Marr, Linsey C.
中科院分区：
文献类型：
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作者：
Hong, Andy;Schweitzer, Lisa;Marr, Linsey C.
美国的大城市在满足联邦空气质量标准方面面临多重挑战。其中一个困难是，在评估与交通有关的空气污染方面存在不确定性，特别是臭氧和某些颗粒物等二次污染物的形成。目前的空气质量模型不适合评估短期交通变化对空气质量的影响。使用区域交通和环境空气质量数据从南加州，我们研究了为期两天的高速公路关闭对交通和几个标准的空气污染物（CO，NO2，O-3，PM10，PM2.5）的影响。结果表明，在封闭期间，区域交通平均下降约14%。日均PM2.5水平下降约32%，每日8小时最大臭氧水平下降约16%。然而，每日1小时最大NO2浓度较高，在某些网站在关闭期间。尽管与NO2混合的结果，这项研究提供了经验证据，支持交通减少作为一种有效的策略，以解决慢性空气污染问题，特别是关于臭氧，在南加州。
Large cities in the United States face multiple challenges in meeting federal air quality standards. One difficulty arises from the uncertainties in evaluating traffic-related air pollution, especially the formation of secondary pollutants such as ozone and some particulate matter. Current air quality models are not well suited to evaluate the impact of a short-term traffic change on air quality. Using regional traffic and ambient air quality data from Southern California, we examine the impact of a two-day freeway closure on traffic and several criteria air pollutants (CO, NO2, O-3, PM10, PM2.5). The results indicate that regional traffic decreased about 14% on average during the closure. Daily average PM2.5 levels decreased by about 32%, and daily 8 h maximum ozone levels decreased by about 16%. However, the daily 1 h maximum NO2 concentration was higher at some sites during the closure. Despite the mixed results with NO2, this study provides empirical evidence to support traffic reduction as an effective strategy to address chronic air pollution problems, especially with regard to ozone, in Southern California.