Pollutant concentrations for
June 30, 2025, 4:00 pm EDT

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Pollutant concentrations for
June 30, 2025, 4:00 pm EDT June 30, 2025, 4:00 pm EDT
Station O3 (ppb) PM2.5 (µg/m3) NO2 (ppb) SO2 (ppb) CO (ppm)
Barrie 49Barrie graph for O3 9Barrie graph for PM2.5 4.6Barrie graph for NO2    
Belleville 57Belleville graph for O3 5Belleville graph for PM2.5 1.6Belleville graph for NO2    
Brampton 40Brampton graph for O3 12Brampton graph for PM2.5 10.6Brampton graph for NO2    
Brantford 42Brantford graph for O3 6Brantford graph for PM2.5 0.9Brantford graph for NO2    
Burlington 47Burlington graph for O3 8Burlington graph for PM2.5 4.4Burlington graph for NO2    
Chatham 45Chatham graph for O3 4Chatham graph for PM2.5 2.4Chatham graph for NO2    
Cornwall 32Cornwall graph for O3 9Cornwall graph for PM2.5 0.9Cornwall graph for NO2    
Dorset 45Dorset graph for O3 6Dorset graph for PM2.5      
Grand Bend 33Grand Bend graph for O3 3Grand Bend graph for PM2.5 1Grand Bend graph for NO2    
Guelph 37Guelph graph for O3 4Guelph graph for PM2.5 1.2Guelph graph for NO2    
Hamilton Downtown 33Hamilton Downtown graph for O3 11Hamilton Downtown graph for PM2.5 13.2Hamilton Downtown graph for NO2 13.1Hamilton Downtown graph for SO2 0.32Hamilton Downtown graph for CO
Hamilton Mountain 39Hamilton Mountain graph for O3 5Hamilton Mountain graph for PM2.5 1.5Hamilton Mountain graph for NO2 0.4Hamilton Mountain graph for SO2  
Hamilton West 35Hamilton West graph for O3 6Hamilton West graph for PM2.5 10.1Hamilton West graph for NO2    
Kingston 42Kingston graph for O3 6Kingston graph for PM2.5 1Kingston graph for NO2    
Kitchener 30Kitchener graph for O3 4Kitchener graph for PM2.5 2.8Kitchener graph for NO2    
London 38London graph for O3 6London graph for PM2.5 2.1London graph for NO2    
Milton 43Milton graph for O3 10Milton graph for PM2.5 6.1Milton graph for NO2 0.2Milton graph for SO2  
Mississauga 40Mississauga graph for O3 9Mississauga graph for PM2.5 4.5Mississauga graph for NO2    
Newmarket 39Newmarket graph for O3 13Newmarket graph for PM2.5 7.4Newmarket graph for NO2    
North Bay 47North Bay graph for O3 3North Bay graph for PM2.5 2.2North Bay graph for NO2    
Oakville 41Oakville graph for O3 11Oakville graph for PM2.5 6.5Oakville graph for NO2    
Oshawa 42Oshawa graph for O3 10Oshawa graph for PM2.5 5.8Oshawa graph for NO2    
Ottawa Downtown 41Ottawa Downtown graph for O3 7Ottawa Downtown graph for PM2.5 1.5Ottawa Downtown graph for NO2    
Parry Sound 50Parry Sound graph for O3 10Parry Sound graph for PM2.5 6Parry Sound graph for NO2    
Peterborough 50Peterborough graph for O3 6Peterborough graph for PM2.5 2.5Peterborough graph for NO2    
Port Stanley 46Port Stanley graph for O3 7Port Stanley graph for PM2.5 1.9Port Stanley graph for NO2    
Sarnia 48Sarnia graph for O3 8Sarnia graph for PM2.5 8.2Sarnia graph for NO2 3.6Sarnia graph for SO2  
Sault Ste. Marie 40Sault Ste. Marie graph for O3 4Sault Ste. Marie graph for PM2.5 1.1Sault Ste. Marie graph for NO2 N/ASault Ste. Marie graph for SO2  
St. Catharines 32St. Catharines graph for O3 8St. Catharines graph for PM2.5 2.7St. Catharines graph for NO2    
Sudbury 39Sudbury graph for O3 4Sudbury graph for PM2.5 2.1Sudbury graph for NO2 1.3Sudbury graph for SO2  
Thunder Bay 30Thunder Bay graph for O3 4Thunder Bay graph for PM2.5 6.2Thunder Bay graph for NO2    
Tiverton 51Tiverton graph for O3 7Tiverton graph for PM2.5      
Toronto Downtown 27Toronto Downtown graph for O3 4Toronto Downtown graph for PM2.5 25.5Toronto Downtown graph for NO2    
Toronto East 40Toronto East graph for O3 10Toronto East graph for PM2.5 5.2Toronto East graph for NO2    
Toronto North 41Toronto North graph for O3 12Toronto North graph for PM2.5 5.4Toronto North graph for NO2 0.5Toronto North graph for SO2  
Toronto West 41Toronto West graph for O3 12Toronto West graph for PM2.5 4.9Toronto West graph for NO2 0Toronto West graph for SO2 0.24Toronto West graph for CO
Windsor Downtown 43Windsor Downtown graph for O3 6Windsor Downtown graph for PM2.5 5.4Windsor Downtown graph for NO2 0Windsor Downtown graph for SO2 0.15Windsor Downtown graph for CO
Windsor West 44Windsor West graph for O3 9Windsor West graph for PM2.5 5.1Windsor West graph for NO2 0.1Windsor West graph for SO2  

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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