Some typical values are: Montreal 116 ppm,[34] Calgary 165 ppm, Regina 496 ppm,[35] Saskatoon 160-180 ppm,[36] Winnipeg 77 ppm,[37] Toronto 121 ppm,[38] Vancouver < 3 ppm,[39] Charlottetown, PEI 140–150 ppm,[40] Waterloo Region 400 ppm, Guelph 460 ppm.[41]