Toronto Downtown, Ontario Air Pollution:
Real-time Air Quality Index (AQI)

Toronto Downtown, Ontario
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Toronto Downtown, Ontario AQI: Toronto Downtown, Ontario Real-time Air Quality Index (AQI).
13
Good
Updated on Thursday 9:00
temperature: 1°C
currentpast 2 daysminmax
PM2.5 AQI
13Toronto Downtown, Ontario, Canada PM25 (fine particulate matter) measured by Air Quality Ontario - the Ontario Ministry of the Environment and Climate Change. Values are converted to the US EPA AQI standard.955
O3 AQI
3Toronto Downtown, Ontario, Canada O3 (ozone) measured by Air Quality Ontario - the Ontario Ministry of the Environment and Climate Change. Values are converted to the US EPA AQI standard.222
NO2 AQI
38Toronto Downtown, Ontario, Canada NO2 (nitrogen dioxide) measured by Air Quality Ontario - the Ontario Ministry of the Environment and Climate Change. Values are converted to the US EPA AQI standard.838
Weather Information
Temp.
1Toronto Downtown, Ontario, Canada t (temp.) measured by Citizen Weather Observer Program (CWOP/APRS).-44
Pressure
1025Toronto Downtown, Ontario, Canada p (pressure:) measured by Citizen Weather Observer Program (CWOP/APRS).10091025
Humidity
63Toronto Downtown, Ontario, Canada h (humidity) measured by Citizen Weather Observer Program (CWOP/APRS).4179
Wind
2Toronto Downtown, Ontario, Canada w (wind) measured by Citizen Weather Observer Program (CWOP/APRS).05
MarkerMarkerMarkerMarkerMarkerMarkerMarker
map © OpenStreetMap contributors

Air Quality Forecast
THU 27
10°C
-1°C
FRI 28
2°C
0°C
SAT 29
13°C
1°C
SUN 30
1°C
0°C
MON 31
2°C
-1°C
PM2.5
O3
Thursday 27Friday 28Saturday 29Sunday 30Monday 31
hour
0369121518210369121518210369121518221471013161922147101316
Wind Speed (m/s)
323568874224456654810975444555653567888






































Temp.
-1°-1°-1°3°8°10°8°3°1°0°0°2°1°0°0°1°1°1°10°12°13°7°2°2°1°0°0°0°1°0°0°1°1°1°0°1°1°0°
relative humidity
576061423042546179757063698198989810092898976778586899089909599100969188787169
barometric pressure
10241024102510241021101710171020102310231023102210201017101410121009100710061006100810131016101810171016101610141011100710051002100310061010101310141017
total precipitation
NaN0.50.10.53.91.51.80.60.60.10.11.81.22.40.10.21.40.9190.1
UVI:
4


6:10 ~ 18:37
UVI:
2


6:09 ~ 18:39
UVI:
1


6:07 ~ 18:40
UVI:
2


6:05 ~ 18:41
UVI:
3


6:03 ~ 18:42
Forecast plotted using timezone -05:00
Latest forecast updates:
Wind: 3 hours ago [Mar 27, 2025 11:22 AM]
fine particulate matter: 18 hours ago [Mar 26, 2025 8:34 PM]
ozone: 18 hours ago [Mar 26, 2025 8:39 PM]
click to view the detailed forecast

Air Quality Data provided by: Air Quality Ontario - the Ontario Ministry of the Environment and Climate Change (airqualityontario.com)

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About the Air Quality and Pollution Measurement:

About the Air Quality Levels

AQIAir Pollution LevelHealth ImplicationsCautionary Statement (for PM2.5)
0 - 50GoodAir quality is considered satisfactory, and air pollution poses little or no riskNone
51 -100ModerateAir quality is acceptable; however, for some pollutants there may be a moderate health concern for a very small number of people who are unusually sensitive to air pollution.Active children and adults, and people with respiratory disease, such as asthma, should limit prolonged outdoor exertion.
101-150Unhealthy for Sensitive GroupsMembers of sensitive groups may experience health effects. The general public is not likely to be affected.Active children and adults, and people with respiratory disease, such as asthma, should limit prolonged outdoor exertion.
151-200UnhealthyEveryone may begin to experience health effects; members of sensitive groups may experience more serious health effectsActive children and adults, and people with respiratory disease, such as asthma, should avoid prolonged outdoor exertion; everyone else, especially children, should limit prolonged outdoor exertion
201-300Very UnhealthyHealth warnings of emergency conditions. The entire population is more likely to be affected.Active children and adults, and people with respiratory disease, such as asthma, should avoid all outdoor exertion; everyone else, especially children, should limit outdoor exertion.
300+HazardousHealth alert: everyone may experience more serious health effectsEveryone should avoid all outdoor exertion

To know more about Air Quality and Pollution, check the wikipedia Air Quality topic or the airnow guide to Air Quality and Your Health.

For very useful health advices of Beijing Doctor Richard Saint Cyr MD, check www.myhealthbeijing.com blog.


Usage Notice: All the Air Quality data are unvalidated at the time of publication, and due to quality assurance these data may be amended, without notice, at any time. The World Air Quality Index project has exercised all reasonable skill and care in compiling the contents of this information and under no circumstances will the World Air Quality Index project team or its agents be liable in contract, tort or otherwise for any loss, injury or damage arising directly or indirectly from the supply of this data.



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