Modelling The Spatio-Temporal Distribution Of Ambient Nitrogen Dioxide And Investigating The Effects Of Public Transit Policies On Population Exposure

Keywords

Air quality; CALMET; CALPUFF; Dispersion modelling; Nitrogen dioxide (NO ) 2; Policy scenario; Public transit; Traffic emissions

Abstract

Estimating the future state of air quality associated with transport policies and infrastructure investments is key to the development of meaningful transportation and planning decisions. This paper describes the design of an integrated transportation and air quality modelling framework capable of simulating traffic emissions and air pollution at a refined spatio-temporal scale. For this purpose, emissions of Nitrogen Oxides (NOx) were estimated in the Greater Montreal Region at the level of individual trips and vehicles. In turn, hourly Nitrogen Dioxide (NO2) concentrations were simulated across different seasons and validated against observations. Our validation results reveal a reasonable performance of the modelling chain. The modelling system was used to evaluate the impact of an extensive regional transit improvement strategy revealing reductions in NO2concentrations across the territory by about 3.6% compared to the base case in addition to a decrease in the frequency and severity of NO2hot spots. This is associated with a reduction in total NOxemissions of 1.9% compared to the base case; some roads experienced reductions by more than half. Finally, a methodology for assessing individuals’ daily exposure is developed (by tracking activity locations and trajectories) and we observed a reduction of 20.8% in daily exposures compared to the base case. The large difference between reductions in the mean NO2concentration across the study domain and the mean NO2exposure across the sample population results from the fact that NO2concentrations dropped largely in the areas which attract the most individuals. This exercise illustrates that evaluating the air quality impacts of transportation scenarios by solely quantifying reductions in air pollution concentrations across the study domain would lead to an underestimation of the potential health gains.

Publication Date

1-1-2017

Publication Title

Environmental Modelling and Software

Volume

91

Number of Pages

186-198

Document Type

Article

Personal Identifier

scopus

DOI Link

https://doi.org/10.1016/j.envsoft.2017.02.007

Socpus ID

85012983015 (Scopus)

Source API URL

https://api.elsevier.com/content/abstract/scopus_id/85012983015

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