GlobeMetrics
EN
  • English✓
  • हिंदी—
  • मराठी—

Try “Pune”, “Poona” or “पुणे”

Air quality · Quebec, Canada

Montreal Air Quality Index (AQI) today

Modelled estimate for 07:00 local time (UTC-5), refreshed 3 Nov, 07:52 UTC+0.

57 Moderate

Live estimate · modelled

US EPA AQI07:00 UTC-5, 3 Nov Main pollutant: PM2.5

Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution.

This page uses EPA’s NowCast, which follows the last few hours, as the US government’s AirNow does. On a 24-hour average of particles, as many apps show, it is 40.

Over the next 24 hours the model expects the AQI to range from 30 around 05:00 to 68 around 15:00 (3 Nov).

536th most polluted of 849 cities worldwide right now, 2nd of 8 in Canada.

What to do today

  • Long walk or run outside OK, lighter if very sensitive
  • Kids playing outside OK
  • Airing the house Open
  • Mask outdoors Not needed

Based on the US EPA’s health statement: “Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution.” General guidance, not medical advice.

Last 24 hours and next 48

Past hours Forecast

08:00 · 21 09:00 · 20 10:00 · 19 11:00 · 19 12:00 · 19 13:00 · 19 14:00 · 21 15:00 · 23 16:00 · 26 17:00 · 31 18:00 · 36 19:00 · 41 20:00 · 44 21:00 · 46 22:00 · 47 23:00 · 47 00:00 · 46 01:00 · 46 02:00 · 47 03:00 · 49 04:00 · 49 05:00 · 50 06:00 · 53 07:00 · 57 08:00 · 59 09:00 · 60 10:00 · 63 11:00 · 64 12:00 · 64 13:00 · 65 14:00 · 67 15:00 · 68 16:00 · 67 17:00 · 66 18:00 · 65 19:00 · 65 20:00 · 60 21:00 · 55 22:00 · 52 23:00 · 49 00:00 · 46 01:00 · 42 02:00 · 37 03:00 · 33 04:00 · 31 05:00 · 30 06:00 · 31 07:00 · 37 08:00 · 42 09:00 · 46 10:00 · 50 11:00 · 51 12:00 · 51 13:00 · 51 14:00 · 52 15:00 · 53 16:00 · 57 17:00 · 64 18:00 · 69 19:00 · 70 20:00 · 70 21:00 · 69 22:00 · 68 23:00 · 67 00:00 · 65 01:00 · 63 02:00 · 61 Now

US EPA AQI per hour, UTC-5. Particles use EPA’s NowCast (a 12-hour weighted average), ozone and CO an 8-hour average. Lighter bars are the CAMS forecast.

Show as a table
TimeAQI
Mon 08:0021
Mon 09:0020
Mon 10:0019
Mon 11:0019
Mon 12:0019
Mon 13:0019
Mon 14:0021
Mon 15:0023
Mon 16:0026
Mon 17:0031
Mon 18:0036
Mon 19:0041
Mon 20:0044
Mon 21:0046
Mon 22:0047
Mon 23:0047
Tue 00:0046
Tue 01:0046
Tue 02:0047
Tue 03:0049
Tue 04:0049
Tue 05:0050
Tue 06:0053
Tue 07:00 · Now57
Tue 08:00 · Forecast59
Tue 09:00 · Forecast60
Tue 10:00 · Forecast63
Tue 11:00 · Forecast64
Tue 12:00 · Forecast64
Tue 13:00 · Forecast65
Tue 14:00 · Forecast67
Tue 15:00 · Forecast68
Tue 16:00 · Forecast67
Tue 17:00 · Forecast66
Tue 18:00 · Forecast65
Tue 19:00 · Forecast65
Tue 20:00 · Forecast60
Tue 21:00 · Forecast55
Tue 22:00 · Forecast52
Tue 23:00 · Forecast49
Wed 00:00 · Forecast46
Wed 01:00 · Forecast42
Wed 02:00 · Forecast37
Wed 03:00 · Forecast33
Wed 04:00 · Forecast31
Wed 05:00 · Forecast30
Wed 06:00 · Forecast31
Wed 07:00 · Forecast37
Wed 08:00 · Forecast42
Wed 09:00 · Forecast46
Wed 10:00 · Forecast50
Wed 11:00 · Forecast51
Wed 12:00 · Forecast51
Wed 13:00 · Forecast51
Wed 14:00 · Forecast52
Wed 15:00 · Forecast53
Wed 16:00 · Forecast57
Wed 17:00 · Forecast64
Wed 18:00 · Forecast69
Wed 19:00 · Forecast70
Wed 20:00 · Forecast70
Wed 21:00 · Forecast69
Wed 22:00 · Forecast68
Wed 23:00 · Forecast67
Thu 00:00 · Forecast65
Thu 01:00 · Forecast63
Thu 02:00 · Forecast61

Pollutants this hour

  • PM2.5 14.9 µg/m³ 24-hour mean 7.2 µg/m³ · within WHO’s 24-hour guideline (15) 57
  • PM10 15 µg/m³ 11
  • O₃ 2 µg/m³ 8
  • NO₂ 41 µg/m³ 20
  • SO₂ 11 µg/m³ 6
  • CO 0.64 mg/m³ 2

Modelled concentrations at the city’s location (CAMS). The sub-index uses the same averaging as the headline, so the highest one is the AQI.

Nearby cities

City AQI
Ottawa Ontario 55
Boston United States 68
Toronto Ontario 36
Mississauga Ontario 34
New York City United States 74
Philadelphia United States 76
Washington United States 61

Where this number comes from

The Copernicus Atmosphere Monitoring Service (CAMS) forecasts air pollution worldwide on a grid (about 11 km over Europe, about 45 km elsewhere). We take the grid value at Montreal’s coordinates and score it with the US EPA’s method. It is a model, not a measurement: a nearby monitoring station can read quite differently, especially next to busy roads or during fires and dust storms.

Full methodology · Data: CAMS via Open-Meteo (CC BY 4.0); city list: GeoNames (CC BY 4.0).

  • Good 0–50
  • Moderate 51–100
  • Unhealthy for sensitive groups 101–150
  • Unhealthy 151–200
  • Very unhealthy 201–300
  • Hazardous 301–500

Questions

What is the AQI in Montreal right now?
57 on the US EPA scale (Moderate) at 07:00 UTC-5, 3 Nov. PM2.5 is the pollutant with the highest sub-index. This is a modelled estimate from the Copernicus Atmosphere Monitoring Service (CAMS), not a reading from a monitoring station.

Is it safe to exercise outside in Montreal today?
For most people, yes. The EPA’s statement for “Moderate”: Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. General guidance, not medical advice.

Will the air in Montreal get better or worse tomorrow?
Over the next 24 hours the model expects the AQI to range from 30 around 05:00 to 68 around 15:00 (3 Nov). Forecasts beyond a day are less certain.

How does Montreal compare with other cities?
Right now it is the 536th most polluted of 849 cities we track worldwide, and 2nd of 8 in Canada, all on the same US EPA scale.

Why does another app show a different AQI for Montreal?
Apps differ in source (government stations, low-cost sensors or a model like this one), in scale (US EPA, European, or a national index) and in averaging (hourly or NowCast, 8-hour, 24-hour). This page uses the US EPA AQI with EPA’s NowCast for particles, computed from the CAMS forecast for the city’s location.