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Effect of Public Transportation on Air Pollution in Tehran: the Case of Metro Network Expansion

Ghotbi, Mohammad Iman | 2020

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 54483 (44)
  4. University: Sharif University of Technology
  5. Department: Management and Economics
  6. Advisor(s): Vesal, Mohammad
  7. Abstract:
  8. Openings and development of subway system have occurred since 1998 in Tehran, and 115 stations have been constructed from then until 2019. This could have various effects on urban characteristics and passenger behaviors, which air pollution could be one of the consequences. In this research, we want to investigate it`s effect on Tehran air pollution as well as heterogenous effects on different distances. For this, we use air pollution data of monitoring stations and meteorological data as well as location and construction time of metro stations. We use difference in difference and OLS regressions to estimate these causal effects. We see that air pollution has been decreased 2-3% as a result of increase one standard deviation in density of metro stations around monitoring stations, but the whole city air pollution does not change with increase in number of metro stations. The increase in subway stations has reduced air pollution around the subway station compared to other areas of the city that did not have subways already, and air pollution near previously established stations has increased compared to the proximity of newly established stations. These results indicate the regional effect of the increase in metro stations
  9. Keywords:
  10. Air Pollution ; Public Transport ; Difference-in-Difference Method ; METRO ; Ordinary Least Squares (OLS)Regression ; Tehran Metro

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