Table 2.

Current measurement locations, earliest date.

Code	Location	Date of First Measurement	Site and Morphological Considerations
S1	Place des Festivals Streets: Balmoral and Mayor	24 May 2019	Site is the largest concert stage (capacity 25 k festivalgoers). In the middle of a large public square with fountains. During events, it is just off from the center of the audience area. A road passes through, which is often closed long-term for these events.
S2	Parterre North Streets: Clark and Maisonneuve	7 January 2020	A medium-sized green space bordered by busy roads. During the daytime, the intersection of a few busy roads, many buses, the confluence of bicycle paths. During festivals, the space is the host of large concerts. Microphone just off from the center of the audience area. Police headquarters and a nearby fire station mean the frequent passage of sirens.
S3	Parterre South Streets: Montigny and Clark	7 January 2020	On a lightly trafficked side of the parterre and more distant from any significant roads. Typically, just behind the stage for large concerts. This space directly adjacent to the site of a large development under construction.