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Measuring Carbon Content in Airway Macrophages Exposed to Carbon-Containing Particulate Matters
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Subways and Urban Air Pollution.

Nicolas Gendron-Carrier1, Marco Gonzalez-Navarro2, Stefano Polloni3

  • 1Department of Economics, McGill University, CIRANO, and CIREQ.

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New subway systems do not significantly change urban air pollution on average. However, in highly polluted cities, subways reduce particulate matter and offer substantial mortality benefits, offsetting construction costs.

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Area of Science:

  • Urban planning
  • Environmental science
  • Public health

Background:

  • Urban air pollution is a significant public health concern.
  • Transportation infrastructure, such as subway systems, can influence urban environments.

Purpose of the Study:

  • To investigate the impact of subway system openings on urban air pollution levels.
  • To quantify the associated public health and economic benefits.

Main Methods:

  • Analysis of particulate matter concentrations before and after subway openings.
  • Examination of pollution changes in relation to initial pollution levels and proximity to city centers.
  • Estimation of mortality benefits and cost-effectiveness.

Main Results:

  • Subway openings had no significant effect on average particulate concentrations.
  • In cities with high initial pollution, subway openings reduced particulates by 4% near city centers.
  • The positive effects decayed with distance and persisted for at least four years.

Conclusions:

  • Subway systems can be a valuable tool for mitigating air pollution in heavily polluted urban areas.
  • The mortality benefits in high-pollution cities are substantial, potentially offsetting significant construction costs.
  • The impact of subways on air quality is context-dependent, primarily benefiting highly polluted cities.