@article{GohlSchrauth2024,
  author    = {Gohl, Niklas and Schrauth, Philipp},
  title     = {JUE insight : ticket to paradise?},
  series = {Journal of urban economics},
  journal   = {Journal of urban economics},
  publisher = {Elsevier},
  address   = {Amsterdam},
  issn      = {0094-1190},
  doi       = {10.1016/j.jue.2024.103643},
  year      = {2024},
  abstract  = {This paper provides novel evidence on the impact of public transport subsidies on air pollution. We obtain causal estimates by leveraging a unique policy intervention in Germany that temporarily reduced nationwide prices for regional public transport to a monthly flat rate price of 9 Euros. Using DiD estimation strategies on air pollutant data, we show that this intervention causally reduced a benchmark air pollution index by more than eight percent and, after its termination, increased again. Our results illustrate that public transport subsidies - especially in the context of spatially constrained cities - offer a viable alternative for policymakers and city planers to improve air quality, which has been shown to crucially affect health outcomes.},
  language  = {en}
}
@article{BorckSchrauth2020,
  author    = {Borck, Rainald and Schrauth, Philipp},
  title     = {Population density and urban air quality},
  series = {Regional science and urban economics},
  volume    = {86},
  journal   = {Regional science and urban economics},
  publisher = {Elsevier},
  address   = {Amsterdam},
  issn      = {0166-0462},
  doi       = {10.1016/j.regsciurbeco.2020.103596},
  pages     = {24},
  year      = {2020},
  abstract  = {We use panel data from Germany to analyze the effect of population density on urban air pollution (nitrogen oxides, particulate matter, ozone, and an aggregate index for bad air quality [AQI]). To address unobserved heterogeneity and omitted variables, we present long difference/fixed effects estimates and instrumental variables estimates, using historical population and soil quality as instruments. Using our preferred estimates, we find that the concentration increases with density for NO2 with an elasticity of 0.25 and particulate matter with elasticity of 0.08. The O-3 concentration decreases with density with an elasticity of -0.14. The AQI increases with density, with an elasticity of 0.11-0.13. We also present a variety of robustness tests. Overall, the paper shows that higher population density worsens local air quality.},
  language  = {en}
}