Choose Station
Barrie
Belleville
Brampton
Brantford
Burlington
Chatham
Cornwall
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Grand Bend
Guelph
Hamilton Downtown
Hamilton Mountain
Hamilton West
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Kitchener
London
Milton
Mississauga
Newmarket
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Ottawa Downtown
Parry Sound
Peterborough
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Sarnia
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St. Catharines
Sudbury
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Tiverton
Toronto Downtown
Toronto East
Toronto North
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Windsor Downtown
Windsor West
Pollutants
Select Pollutant
Ozone (O3)
Fine Particulate Matter (PM2.5)
Nitrogen Dioxide (NO2)
Carbon Monoxide (CO)
Sulphur Dioxide (SO2)
Day
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
Month
January
February
March
April
May
June
July
August
September
October
November
December
Year
2007
2008
2009
2010
2011
2012
2013
2014
2015
2016
2017
2018
2019
2020
2021
2022
2023
2024
Chart
Table
: Hourly Ozone Readings
From May-16-2024 EDT to May-18-2024 EDT.
May-16-2024 EDT
May-17-2024 EDT
May-18-2024 EDT
