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Dundas BRT

Dundas BRT - Environment

In Toronto, Mississauga East and Mississauga West, the studies to identify the baseline conditions, determine any potential for impacts, and propose measures to mitigate potential negative impacts are underway. The studies being conducted by the project team are identified below.  

Existing Environmental Conditions – Key Findings

The following key findings outlined in the slides below have been determined based on environmental existing conditions studies conducted to-date. These findings will be used to help inform the development of the preferred design and the completion of the environmental impact assessment.  

Separate TPAPs will be completed for the following study areas:  



Kipling Transit Hub to Etobicoke Creek   

Mississauga East

Mississauga East  

Etobicoke Creek to Confederation Parkway

Mississauga West

Mississauga West  

Confederation Parkway to Ninth Line

Natural Environment

In Mississauga East, the study area includes a variety of urban, residential and industrial areas which are divided by several natural features including watercourses, riparian areas and vegetated corridors.

Socio-Economic & Land Use

The Toronto corridor is consistent with provincial and municipal plans and policies as it is anticipated to enhance public transit connections and support economic development objectives.

Cultural Heritage

Seventeen built heritage resources and cultural heritage landscapes have been identified within the project area boundaries.

Noise & Vibration

The ambient sound levels at the most impacted noise sensitive locations (e.g., dwellings) are dominated by a combination of existing Dundas Street and the intersecting roads.


Three registered archaeological sites were identified within one km of the current project area boundaries.

Climate Change & Sustainability

A Greenhouse Gas Inventory is being developed that incorporates the emissions during construction and operations and will include the resulting mode shift as a result of the entire Dundas BRT.

Traffic & Transportation

Within Toronto, Dundas Street has a six-lane cross-section with a centre two-way left-turn lane providing access to many side streets and private driveways.

Air Quality

In Toronto, contaminants showing higher levels of background concentration above 80% of the federal standards include nitrogen dioxide and fine particulate matter (PM2.5).

Halton and Hamilton

Through Halton Region, much of the corridor has been studied under various Municipal Class Environmental Assessment (EA) studies and has already been widened to six lanes. Further, the Dundas BRT Initial Business Case (IBC) identifies the use of existing curb lanes instead of median BRT (meaning significant construction would not be required).  

Through Hamilton, it is anticipated that only operational changes will occur. Any operational or localized design modifications would be considered exempt from the Transit Project Assessment Process (TPAP) (no further Environmental Assessment Act requirements) and could be addressed through the Municipal Class EA Schedule A and A+ (pre-approved) process.  

The proposed infrastructure changes for the Dundas BRT project through Halton and Hamilton are exempt from Environmental Assessment Act requirements. As such, TPAP approvals are not being sought through Halton and Hamilton, and associated environmental studies are not being completed as part of this project.