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Air quality · Ontario, Canada

Mississauga Air Quality Index (AQI) today

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

34 Good

Live estimate · modelled

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

Air quality is satisfactory, and air pollution poses little or no risk.

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 53.

Over the next 24 hours the model expects the AQI to range from 40 around 08:00 to 55 around 20:00 (3 Nov).

750th most polluted of 849 cities worldwide right now, 7th of 8 in Canada.

What to do today

  • Long walk or run outside OK
  • Kids playing outside OK
  • Airing the house Open
  • Mask outdoors Not needed

Based on the US EPA’s health statement: “Air quality is satisfactory, and air pollution poses little or no risk.” General guidance, not medical advice.

Last 24 hours and next 48

Past hours Forecast

08:00 · 31 09:00 · 40 10:00 · 47 11:00 · 51 12:00 · 54 13:00 · 57 14:00 · 59 15:00 · 60 16:00 · 59 17:00 · 60 18:00 · 60 19:00 · 60 20:00 · 59 21:00 · 58 22:00 · 57 23:00 · 56 00:00 · 53 01:00 · 47 02:00 · 40 03:00 · 36 04:00 · 32 05:00 · 31 06:00 · 31 07:00 · 34 08:00 · 40 09:00 · 42 10:00 · 43 11:00 · 41 12:00 · 40 13:00 · 40 14:00 · 41 15:00 · 44 16:00 · 48 17:00 · 52 18:00 · 53 19:00 · 54 20:00 · 55 21:00 · 55 22:00 · 55 23:00 · 54 00:00 · 53 01:00 · 52 02:00 · 51 03:00 · 48 04:00 · 46 05:00 · 44 06:00 · 43 07:00 · 47 08:00 · 52 09:00 · 55 10:00 · 55 11:00 · 55 12:00 · 54 13:00 · 55 14:00 · 55 15:00 · 55 16:00 · 56 17:00 · 58 18:00 · 59 19:00 · 59 20:00 · 59 21:00 · 57 22:00 · 52 23:00 · 43 00:00 · 35 01:00 · 28 02:00 · 26 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 08:0031
Mon 09:0040
Mon 10:0047
Mon 11:0051
Mon 12:0054
Mon 13:0057
Mon 14:0059
Mon 15:0060
Mon 16:0059
Mon 17:0060
Mon 18:0060
Mon 19:0060
Mon 20:0059
Mon 21:0058
Mon 22:0057
Mon 23:0056
Tue 00:0053
Tue 01:0047
Tue 02:0040
Tue 03:0036
Tue 04:0032
Tue 05:0031
Tue 06:0031
Tue 07:00 · Now34
Tue 08:00 · Forecast40
Tue 09:00 · Forecast42
Tue 10:00 · Forecast43
Tue 11:00 · Forecast41
Tue 12:00 · Forecast40
Tue 13:00 · Forecast40
Tue 14:00 · Forecast41
Tue 15:00 · Forecast44
Tue 16:00 · Forecast48
Tue 17:00 · Forecast52
Tue 18:00 · Forecast53
Tue 19:00 · Forecast54
Tue 20:00 · Forecast55
Tue 21:00 · Forecast55
Tue 22:00 · Forecast55
Tue 23:00 · Forecast54
Wed 00:00 · Forecast53
Wed 01:00 · Forecast52
Wed 02:00 · Forecast51
Wed 03:00 · Forecast48
Wed 04:00 · Forecast46
Wed 05:00 · Forecast44
Wed 06:00 · Forecast43
Wed 07:00 · Forecast47
Wed 08:00 · Forecast52
Wed 09:00 · Forecast55
Wed 10:00 · Forecast55
Wed 11:00 · Forecast55
Wed 12:00 · Forecast54
Wed 13:00 · Forecast55
Wed 14:00 · Forecast55
Wed 15:00 · Forecast55
Wed 16:00 · Forecast56
Wed 17:00 · Forecast58
Wed 18:00 · Forecast59
Wed 19:00 · Forecast59
Wed 20:00 · Forecast59
Wed 21:00 · Forecast57
Wed 22:00 · Forecast52
Wed 23:00 · Forecast43
Thu 00:00 · Forecast35
Thu 01:00 · Forecast28
Thu 02:00 · Forecast26

Pollutants this hour

  • PM2.5 6.9 µg/m³ 24-hour mean 10.1 µg/m³ · within WHO’s 24-hour guideline (15) 34
  • PM10 8 µg/m³ 6
  • O₃ 47 µg/m³ 25
  • NO₂ 22 µg/m³ 10
  • SO₂ 7 µg/m³ 3
  • CO 0.22 mg/m³ 1

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
Toronto Ontario 36
Ottawa Ontario 55
Columbus United States 27
Montreal Quebec 57
Philadelphia United States 76
New York City United States 74
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 Mississauga’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 Mississauga right now?
34 on the US EPA scale (Good) 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 Mississauga today?
For most people, yes. The EPA’s statement for “Good”: Air quality is satisfactory, and air pollution poses little or no risk. General guidance, not medical advice.

Will the air in Mississauga get better or worse tomorrow?
Over the next 24 hours the model expects the AQI to range from 40 around 08:00 to 55 around 20:00 (3 Nov). Forecasts beyond a day are less certain.

How does Mississauga compare with other cities?
Right now it is the 750th most polluted of 849 cities we track worldwide, and 7th of 8 in Canada, all on the same US EPA scale.

Why does another app show a different AQI for Mississauga?
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.