Montreal Air Pollution: Real-time Air Quality Index (AQI)

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Montreal AQI: Montreal Real-time Air Quality Index (AQI).
74
Moderate
Updated on Sunday 8:00
temperature: 25°C
currentpast 2 daysminmax
PM2.5 AQI
74Montreal PM25 (fine particulate matter) measured by Ville de Montreal - Réseau de surveillance de la qualité de l air. Values are converted to the US EPA AQI standard.64125
O3 AQI
24Montreal O3 (ozone) measured by Ville de Montreal - Réseau de surveillance de la qualité de l air. Values are converted to the US EPA AQI standard.740
NO2 AQI
7Montreal NO2 (nitrogen dioxide) measured by Ville de Montreal - Réseau de surveillance de la qualité de l air. Values are converted to the US EPA AQI standard.433
SO2 AQI
5Montreal SO2 (sulfur dioxide) measured by Ville de Montreal - Réseau de surveillance de la qualité de l air. Values are converted to the US EPA AQI standard.510
CO AQI
-Montreal CO (carbon monoxide) measured by Ville de Montreal - Réseau de surveillance de la qualité de l air. Values are converted to the US EPA AQI standard.613
Temp.
25Montreal t (temp.) measured by : • Citizen Weather Observer Program (CWOP/APRS) • Weather Underground.2132
Dew
-Montreal d (dew) measured by : • Citizen Weather Observer Program (CWOP/APRS) • Weather Underground.19
Pressure
1024Montreal p (pressure:) measured by : • Citizen Weather Observer Program (CWOP/APRS) • Weather Underground.10211026
Humidity
65Montreal h (humidity) measured by : • Citizen Weather Observer Program (CWOP/APRS) • Weather Underground.4097
Wind
0Montreal w (wind) measured by : • Citizen Weather Observer Program (CWOP/APRS) • Weather Underground.02
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Air Quality Forecast
SUN 10
33°C
21°C
MON 11
35°C
22°C
TUE 12
36°C
22°C
WED 13
26°C
21°C
THU 14
30°C
20°C
PM2.5
Sunday 10Monday 11Tuesday 12Wednesday 13Thursday 14
hour
0369121518210369121518210369121518210369121518210369121518
Wind Speed (m/s)
443544445445434444444554544444443342242







































Temp.
23°21°22°26°31°33°32°27°25°23°22°28°33°35°33°28°25°23°23°29°33°36°30°28°25°23°21°22°24°26°23°21°21°20°21°26°30°29°26°
relative humidity
788280584741435455616647342935545357604936314752567293938671909596977846374047
barometric pressure
102010201021102110201019101910191020101910201020101910161015101610161016101610161014101110111011101110111012101210121011101110111012101210151015101410141015
total precipitation
0.70.10.10.11.61.62.40.51.70.10.10.10.2
UVI:
5


5:49 ~ 20:13
UVI:
7


5:50 ~ 20:11
UVI:
7


5:51 ~ 20:10
UVI:
7


5:52 ~ 20:08
UVI:
7


5:53 ~ 20:06
Forecast plotted using timezone -04:00
Latest forecast updates:
Wind: 2 days ago [Aug 9, 2025 2:40 AM]
fine particulate matter: a day ago [Aug 9, 2025 2:15 PM]
ozone: 4 months ago [Mar 30, 2025 8:39 PM]
click to view the detailed forecast

Air Quality Data provided by: Ville de Montreal - Réseau de surveillance de la qualité de l'air (ville.montreal.qc.ca) and the Weather Underground (wunderground.com)

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This air quality monitoring station real-time data can be programmatically accessed using this API url: (For more information, check the API page:aqicn.org/api/ )

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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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