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@article{Ma:2021:10.1016/j.atmosenv.2020.118025,
author = {Ma, L and Graham, DJ and Stettler, MEJ},
doi = {10.1016/j.atmosenv.2020.118025},
journal = {Atmospheric Environment},
pages = {118025--118025},
title = {Air quality impacts of new public transport provision: A causal analysis of the Jubilee Line Extension in London},
url = {http://dx.doi.org/10.1016/j.atmosenv.2020.118025},
volume = {245},
year = {2021}
}
TY - JOUR
AB - Public transport is commonly associated with benefits such as reducing road traffic congestion and improving air quality. This paper focuses on evaluating the causal impact of a new public transport provision in London, the Jubilee Line Extension (JLE) in 1999, on air quality. Using meteorological normalisation and a regression discontinuity design with time as the forcing variable, we show that the JLE led to only small changes in air pollution at some specific locations; detectable changes in NOx, NO2, and O3 concentrations were found at 63%, 43% and 29% of air pollution monitoring sites, respectively. For those sites where a change in pollution was detected, the responses ranged from −2% to +1% for NO2 and -1% to 0% for O3. We calculate that the long-run effects are greater, ranging from −11% to +3% for NO2 and from −2% to +2% for O3 at sites that showed a response to the JLE. Aggregating across all sites in London for a city-wide effect, both short and long-run effects were less than 1% or insignificant. We find statistically significant increases in NO2 and O3 concentrations at some background sites, but the magnitude of effect is within +1% in the short-run and +3% in the long-run. Our analysis shows that the effect of the JLE on air pollution in some areas was greater than others, however across London the effect was small and this indicates that public transport provision on its own is not an effective strategy to improve air quality.
AU - Ma,L
AU - Graham,DJ
AU - Stettler,MEJ
DO - 10.1016/j.atmosenv.2020.118025
EP - 118025
PY - 2021///
SN - 1352-2310
SP - 118025
TI - Air quality impacts of new public transport provision: A causal analysis of the Jubilee Line Extension in London
T2 - Atmospheric Environment
UR - http://dx.doi.org/10.1016/j.atmosenv.2020.118025
UR - https://www.sciencedirect.com/science/article/pii/S1352231020307585?via%3Dihub
UR - http://hdl.handle.net/10044/1/84567
VL - 245
ER -
Transport Strategy Centre
Department of Civil and Environmental Engineering
South Kensington Campus
Imperial College London
London SW7 2AZ - UK
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