Pollutant Concentrations for June 23, 2025, 12:00 am EDT

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Air Pollutant 1-Hour Concentrations For June 23, 2025, 12:00 am EDT
Station O3 (ppb) PM2.5 (µg/m3) NO2 (ppb) SO2 (ppb) CO (ppm)
9
Thunder Bay graph for O3
5
Thunder Bay graph for PM2.5
1.5
Thunder Bay graph for NO2
   
21
Sault Ste. Marie graph for O3
11
Sault Ste. Marie graph for PM2.5
1
Sault Ste. Marie graph for NO2
0
Sault Ste. Marie graph for SO2
 
31
Windsor West graph for O3
12
Windsor West graph for PM2.5
9.1
Windsor West graph for NO2
0
Windsor West graph for SO2
 
28
Windsor Downtown graph for O3
10
Windsor Downtown graph for PM2.5
14.3
Windsor Downtown graph for NO2
0
Windsor Downtown graph for SO2
0.21
Windsor Downtown graph for CO
29
Sarnia graph for O3
10
Sarnia graph for PM2.5
19.4
Sarnia graph for NO2
2
Sarnia graph for SO2
 
36
Chatham graph for O3
8
Chatham graph for PM2.5
5.4
Chatham graph for NO2
   
36
Grand Bend graph for O3
10
Grand Bend graph for PM2.5
3.1
Grand Bend graph for NO2
   
48
Tiverton graph for O3
11
Tiverton graph for PM2.5
     
45
London graph for O3
11
London graph for PM2.5
3.6
London graph for NO2
   
57
Port Stanley graph for O3
13
Port Stanley graph for PM2.5
2.5
Port Stanley graph for NO2
   
24
Sudbury graph for O3
13
Sudbury graph for PM2.5
5.6
Sudbury graph for NO2
0
Sudbury graph for SO2
 
42
Kitchener graph for O3
11
Kitchener graph for PM2.5
2.9
Kitchener graph for NO2
   
48
Brantford graph for O3
11
Brantford graph for PM2.5
2.4
Brantford graph for NO2
   
42
Guelph graph for O3
11
Guelph graph for PM2.5
3.9
Guelph graph for NO2
   
21
Parry Sound graph for O3
12
Parry Sound graph for PM2.5
0.8
Parry Sound graph for NO2
   
45
Hamilton West graph for O3
11
Hamilton West graph for PM2.5
3.9
Hamilton West graph for NO2
   
45
Hamilton Mountain graph for O3
11
Hamilton Mountain graph for PM2.5
1.5
Hamilton Mountain graph for NO2
0
Hamilton Mountain graph for SO2
 
41
Milton graph for O3
14
Milton graph for PM2.5
4
Milton graph for NO2
0.2
Milton graph for SO2
 
44
Hamilton Downtown graph for O3
12
Hamilton Downtown graph for PM2.5
3
Hamilton Downtown graph for NO2
0.3
Hamilton Downtown graph for SO2
0.16
Hamilton Downtown graph for CO
38
Burlington graph for O3
11
Burlington graph for PM2.5
7.4
Burlington graph for NO2
   
44
Brampton graph for O3
13
Brampton graph for PM2.5
3.8
Brampton graph for NO2
   
22
Barrie graph for O3
12
Barrie graph for PM2.5
3.5
Barrie graph for NO2
   
Oakville graph for O3
10
Oakville graph for PM2.5
4.8
Oakville graph for NO2
   
41
Mississauga graph for O3
11
Mississauga graph for PM2.5
3.1
Mississauga graph for NO2
   
36
Toronto West graph for O3
14
Toronto West graph for PM2.5
5.9
Toronto West graph for NO2
0
Toronto West graph for SO2
0.24
Toronto West graph for CO
38
Newmarket graph for O3
10
Newmarket graph for PM2.5
2.1
Newmarket graph for NO2
   
42
Toronto North graph for O3
13
Toronto North graph for PM2.5
7.7
Toronto North graph for NO2
0.3
Toronto North graph for SO2
 
12
North Bay graph for O3
8
North Bay graph for PM2.5
2.1
North Bay graph for NO2
   
25
Toronto Downtown graph for O3
26
Toronto Downtown graph for PM2.5
27.8
Toronto Downtown graph for NO2
   
36
Toronto East graph for O3
13
Toronto East graph for PM2.5
6.6
Toronto East graph for NO2
   
37
St. Catharines graph for O3
10
St. Catharines graph for PM2.5
2.1
St. Catharines graph for NO2
   
0
Dorset graph for O3
8
Dorset graph for PM2.5
     
31
Oshawa graph for O3
15
Oshawa graph for PM2.5
6.1
Oshawa graph for NO2
   
38
Peterborough graph for O3
12
Peterborough graph for PM2.5
3.7
Peterborough graph for NO2
   
36
Belleville graph for O3
11
Belleville graph for PM2.5
1.6
Belleville graph for NO2
   
44
Kingston graph for O3
15
Kingston graph for PM2.5
1.5
Kingston graph for NO2
   
22
Ottawa Downtown graph for O3
8
Ottawa Downtown graph for PM2.5
4.5
Ottawa Downtown graph for NO2
   
17
Cornwall graph for O3
9
Cornwall graph for PM2.5
4.2
Cornwall graph for NO2
   

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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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