Computing mobile emissions for the Montreal area

Abstract

A computational procedure, that takes into account climatic data and produces hourly mobile emissions of pollutants on a fine grid for the Montréal Metropolitan area has been developed for the use of Environment Canada. The procedure computes HC, CO, NO x , CO 2 , SO 2 and NH 3 mobile emissions, as well as 2.5-and 10-µm particles. The mobile emissions are calculated on the highways and main arteries of the Montreal road network. The emissions from parked vehicles are computed as well. A user friendly interface, called GRILLE, has been developed for entering parameters and launching the calculations. GRILLE calls up command files for the MOBILE 6.2C software and EMME/2 macros, which include the calculation procedure. This procedure has two parts. The first, obtains emission rates, and the second part, obtains the vehicle flows on the network and estimates the pollution on a fine grid. Results could be retrieved as simple text format or as graphic output. The emission computations can be done for any day and any hour of the year. Use of the model by Environment Canada is described as well.

Wintertime radiation and energy budget along an urbanization gradient in Montreal, Canada

“…Weekday F t was computed using simulated displacements along a simplified road network within an approximately 3 km radius of each site for a weekday in January 2009 (Olivier Gagnon, personal communication) based on vehicle counts by class from the 2003 origin‐destination survey (AMT, 2009a)). Weekend F t was taken from Noriega et al (2006). EV was calculated as follows: where NHC is the net heat of combustion of gasoline (45 × 10 6 J kg −1 ), ρ fuel the optimal fuel density of gasoline (0.75 kg l −1 ), and FE the fuel economy (l km −1 ).…”