Working Papers,
Swedish National Road & Transport Research Institute (VTI)

Abstract: This paper provides two micro-economic models that derive the social cost of a low emission zone (LEZ) for light vehicles. We apply the models to a proposed LEZ for light vehicles in Stockholm, which would prohibit diesel cars of Euro 5 or lower and gasoline cars of Euro 4 or lower in the inner city (25 km2 ). The first model is based on how an increase in user cost impacts traffic volumes in the inner city. This rather conventional user cost calculation of drivers’ loss requires however some strong assumptions. The second model shows that drivers’ losses can be calculated based on price changes observed on the used car market. Our empirical results indicate that the second model yields a twice as large welfare loss as the first. The forecasted benefits of the LEZ consist primarily of air quality improvements leading to health benefits. The empirical results must be interpreted with caution, but we find that the social benefit of air quality improvements is less than a tenth of the social cost.

Keywords: Dieselgate; Low emission zones; Environmental zones; Cost-benefit analysis; Car market

JEL-codes: D61; H54; R41; R48

28 pages, First version: August 28, 2020. Revised: September 9, 2021.

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