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Air Quality Ontario

ozone O3:

ozone O3 Concentrations by stations.
Station Location O3
Barrie83 Perry St.33
Belleville2 Sidney St., Water Treatment Plant38
Brampton109 Mclaughlin Rd. S.35
Brantford324 Grand River Ave.31
BurlingtonNorth Shore Blvd. E. Lakeshore Rd.24
Chatham435 Grand Ave. W.32
CornwallBedford St. 3rd St. W.32
Dorset1026 Bellwood Acres Rd.32
Grand BendPoint Blake Conservation Area25
GuelphExhibition St. Clark St. W.29
Hamilton DowntownElgin St. Kelly St.32
Hamilton Mountain250 Fennell Ave. W.33
Hamilton WestMain St. W. Hwy 40325
Kingston23 Beechgrove Lane45
KitchenerWest Ave. Homewood Ave.30
London42 St. Julien St.24
Milton1120 Main St. E.30
Mississauga3359 Mississauga Rd. N., U of T Campus29
NewmarketEagle St. W. McCaffrey Rd.33
North BayElgin St. Kelly St.36
OakvilleEighth Line, Glenashton Dr., Halton Res.34
OshawaBrittania Ave. W., Ep Taylor Stables28
Ottawa DowntownRideau St. Wurtemburg St.20
Parry Sound7 Bay St.35
Peterborough10 Hospital Dr.37
Port Stanley43665 Dexter Line, Elgin Water T. Plt23
Sarnia700 Christina St. N.33
Sault Ste. MarieSault College26
St. CatharinesArgyle Cres., Pump Stn.40
Sudbury155 Elm St.39
Thunder Bay421 James St. S.17
Tiverton4th Concession, Bruce Rd. 2341
Toronto Downtown55 John St.33
Toronto EastKennedy Rd. Lawrence Ave. E.31
Toronto North4905 Dufferin St., Eccc33
Toronto West125 Resources Rd.27
Windsor Downtown467 University Ave. W.40
Windsor WestCollege Ave. South St.40

Ontario's ambient air monitoring stations

ozone O3 Concentrations for Tuesday, July 1, 2025, 11:00 pm

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

Note: N/A (not available) denotes invalid or missing data.
Ontario 1-hour AAQC for O3 = 80 ppb