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Air Quality - Exhibition Station

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Key Findings


  • There are existing exceedances of a number of contaminants, including nitrogen dioxide (NO2), a main combustion product from vehicular exhaust; benzene and benzo(a)pyrene, produced by both industry and vehicular exhaust; and fine particulate matter (PM2.5) (dust), produced by industry and vehicular exhausts within the city.  High levels of vehicular exhaust contaminants, such as nitrogen dioxide, benzene, and benzo(a)pyrene, are typical of a highly urbanized environment like the City of Toronto.
  • Six sensitive receptors* have been identified within the study area (i.e., apartments/condominiums): 1 Springhurst Avenue, 25 Liberty Street, 43 Hanna Avenue, 5 Hanna Avenue, 85 King Street West, and 150 East Liberty Street – without mitigation, these locations have the potential to be affected based on proximity to the project footprint and predominant wind direction.
  • There is potential for temporary increases in contaminants associated with construction vehicle emissions. These increases will be minimized via implementing appropriate mitigation measures (see Potential Effects & Mitigation Measures for more details).

*A sensitive receptor is a building in which a person resides on a permanent or semi-permanent basis, such as a house or an apartment.


Exhibition Station Sensitive Receptors

Potential Effects and Mitigation Measures

Potential Effects:

  • Temporary increase in air pollution and odour (e.g., diesel combustion products such as NO2) as a result of construction vehicle emissions and increased traffic due to congestion associated with construction activities.
  • Temporary increase in dust, silica and airborne particulate matter resulting from earthworks, excavation, material handling and transfer, demolition and construction activities.

Mitigation Measures:

  • Construction equipment will comply with all applicable regulatory emission standards.
  • Contain (e.g., tarp) sources of dust such as soil stockpiles, as required.
  • Full or partial enclosure of demolition and other activities, where possible and necessary.
  • Reduction of activities during high wind conditions.
  • Use dust suppressants such as water, as required.
  • Implement on-site air quality monitoring and apply threshold “Action Level” triggers for implementation of specific and increasing intensity mitigation activities linked to specific construction activities.

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