Did the London congestion charge reduce pollution?

  title={Did the London congestion charge reduce pollution?},
  author={Colin Green and John S. Heywood and Maria Navarro Paniagua},
  journal={Regional Science and Urban Economics},
We examine the London congestion charge introduced in 2003 and demonstrate significant reductions in a number of pollutants relative to controls. We even find evidence of reductions per mile driven suggesting amelioration of a congestion externality. Yet, we find a robust countervailing increase in harmful NO2 likely reflecting the disproportionate share of diesel vehicles exempt from the congestion charge. This unintended consequence informs on-going concern about pollution from diesel based… 
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