许可证
空气质量指数
政府(语言学)
运输工程
空气污染物
环境科学
业务
质量(理念)
空气污染
工程类
地理
气象学
计算机科学
语言学
哲学
化学
有机化学
认识论
操作系统
摘要
In 1989, the government of Mexico City introduced a program, Hoy No Circula, that bans most drivers from using their vehicles one weekday per week on the basis of the last digit of the vehicle’s license plate. This article measures the effect of the driving restrictions on air quality using high‐frequency measures from monitoring stations. Across pollutants and specifications there is no evidence that the restrictions have improved air quality. Evidence from additional sources indicates that the restrictions led to an increase in the total number of vehicles in circulation as well as a change in composition toward high‐emissions vehicles.
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