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Clean ride mapper: Cycling the less polluted routes

Cyclists in Montreal and Toronto can now choose the least polluted routes to get around their cities thanks to an online tool developed at McGill University. Sometimes a detour of less than 1 km can make for a much less polluted ride. 

Cycling and car-related air pollution facts:

  • On certain days, some of Montreal`s most popular cycling paths, such as the one along the Lachine Canal, are also the most polluted because of wind patterns and the proximity to highways;
  • Urban canyons with tall buildings down both sides of the street tend to be more polluted, since it is more difficult for the pollution to be dispersed;
  • Within urban canyons, one side of the street can be much less polluted than the other depending on local wind circulation;
  • Traffic intersections are hot spots for pollutants of all kinds because of the number of cars idling there;
  • Distance from car traffic is an important factor in decreasing cyclists` exposure to air pollution.

About the online cycling mapper:

The tool uses maps of traffic-related air pollution to estimate outdoor concentrations of pollutants such as nitrogen dioxide (NO2) and ultrafine particles (very small particles produced during fuel combustion) along roadways throughout in Montreal and Toronto. Both of these pollutants have been associated with adverse health effects.

Cyclists enter their origin and destination on the map. They are then provided with routes that are likely to decrease their exposure to traffic and traffic-related air pollution, along with the shortest route between the two points. Sometimes a detour of less than 1 km can result in a much less polluted ride. The tool will continue to be updated with new data that the researchers collect on air pollution in Toronto and Montreal.

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