Pollutant concentrations for July 17, 2026, 9:00 pm EDT

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Pollutant concentrations for July 17, 2026, 9:00 pm EDT

Station	O3 (ppb)	PM2.5 (µg/m3)	NO2 (ppb)	SO2 (ppb)	CO (ppm)
Barrie	33	74	2.1
Belleville	31	4	1
Brampton	48	73	7.2
Brantford	40	121	3.2
Burlington	42	88	7.8
Chatham	43	95	1.5
Cornwall	30	5	2.3
Dorset	15	6
Grand Bend	37	111	3
Guelph	45	102	4.2
Hamilton Downtown	41	91	4.1	0.7	0.85
Hamilton Mountain	46	87	3.2	0.2
Hamilton West	42	90	5
Kingston	29	4	0.9
Kitchener	45	114	4.1
London	44	132	2.3
Milton	48	101	1.5	0.5
Mississauga	37	40	5.6
Newmarket	43	47	7
North Bay	28	4	0.8
Oakville	45	78	4.8
Oshawa	29	6	3.5
Ottawa Downtown	30	6	3
Parry Sound	35	44	1.3
Peterborough	32	6	1.8
Port Stanley	46	147	1.4
Sarnia	40	162	4.3	0.2
Sault Ste. Marie	18	33	1.5	0
St. Catharines	38	44	3
Sudbury	30	6	1.7	0.1
Thunder Bay	21	170	3.2
Tiverton	37	156
Toronto Downtown	29	27	18.5
Toronto East	32	12	2.5
Toronto North	37	31	7.6	0
Toronto West	43	37	4.2	0	0.45
Windsor Downtown	51	151	3.4	0.2	1.29
Windsor West	46	146	2.5	0.2

Order by station location (east to west)

Note: 
Ontario 1-hour AAQC for O₃ = 80 ppb
Ontario 1-hour AAQC for NO₂ = 200 ppb
Ontario 1-hour AAQC for SO₂ = 40 ppb
Ontario 1-hour AAQC for CO = 30 ppm

Note: The pollutant concentrations on this web page are based on automatically polled data and have not undergone final verification.

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