Air quality and noise monitoring

A platform is currently being developed to present the data every 48 hours. In the meantime, the data will be updated in this section of the website every week.

The project must meet specific criteria regarding total suspended particulates (TSP) and particulate matter (PM2.5). These criteria are based on the standards set out by the Clean Air Regulation. The criteria are: 120 µg/m3 over 24 hours for total suspended particulates, and 30 µg/m3 over 24 hours for particulate matter.

The project must also adhere to noise criteria set by the Ministère du Développement durable, de l’Environnement et de la Lutte contre les changements climatiques. For fixed site work, such as the construction of stations and related infrastructure, the reference criterion for noise is the ambient level prior to the work over three separate periods. For further details, click here.

*In the graph, the line "total dB" in blue reflects the raw data recorded on site. The audio tapes are then listened and analyzed so that noise is removed when it is not attributable (e.g. fire or ambulance sirens, school playground, etc.). The "chantier" line in red reflects the sound level of the work site alone. The yellow line reflects the noise criteria (based on MDDELCC recommendations) for works realized daily, from 7:00 a.m. to 7:00 p.m., and adapted to each site based on the initial context. The MDDELCC “acknowledges that there are situations where the prime contractor cannot respect these limits when performing the work.” We have to show that all reasonable and feasible mitigation measures were implemented.

The scale below shows some examples of noise levels.