HAVE VEHICLE REGISTRATION RESTRICTIONS IMPROVED URBAN AIR QUALITY IN JAPAN
2020
About 2.6 million non-compliant vehicles were removed from designated metropolitan areas in Japan after the introduction of vehicle registration restrictions under the 1992 Automobile NOx Control Law. Based on a difference-in-differences framework and using a monitor-level panel dataset for the period January 1981–December 2015, we find that the intervention led to a 3–6% reduction in the monthly mean ambient concentration of nitrogen dioxide (NO2) in the treated areas. Back-of-the-envelope calculations identify benefits equal to about US$104 million as a result of reduced mortality from asthma.
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