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Air quality · Ontario, Canada

Toronto Air Quality Index (AQI) today

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

36 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 56.

Over the next 24 hours the model expects the AQI to range from 41 around 08:00 to 56 around 20:00 (3 Nov).

738th most polluted of 849 cities worldwide right now, 6th 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 · 42 09:00 · 51 10:00 · 53 11:00 · 55 12:00 · 58 13:00 · 62 14:00 · 66 15:00 · 68 16:00 · 70 17:00 · 69 18:00 · 65 19:00 · 61 20:00 · 59 21:00 · 57 22:00 · 55 23:00 · 54 00:00 · 53 01:00 · 52 02:00 · 46 03:00 · 40 04:00 · 36 05:00 · 33 06:00 · 33 07:00 · 36 08:00 · 41 09:00 · 44 10:00 · 47 11:00 · 47 12:00 · 45 13:00 · 47 14:00 · 49 15:00 · 53 16:00 · 53 17:00 · 54 18:00 · 54 19:00 · 55 20:00 · 56 21:00 · 56 22:00 · 56 23:00 · 55 00:00 · 55 01:00 · 54 02:00 · 54 03:00 · 53 04:00 · 52 05:00 · 51 06:00 · 51 07:00 · 52 08:00 · 53 09:00 · 55 10:00 · 56 11:00 · 56 12:00 · 56 13:00 · 57 14:00 · 58 15:00 · 59 16:00 · 59 17:00 · 59 18:00 · 58 19:00 · 58 20:00 · 56 21:00 · 53 22:00 · 49 23:00 · 44 00:00 · 38 01:00 · 32 02:00 · 30 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 08:0042
Mon 09:0051
Mon 10:0053
Mon 11:0055
Mon 12:0058
Mon 13:0062
Mon 14:0066
Mon 15:0068
Mon 16:0070
Mon 17:0069
Mon 18:0065
Mon 19:0061
Mon 20:0059
Mon 21:0057
Mon 22:0055
Mon 23:0054
Tue 00:0053
Tue 01:0052
Tue 02:0046
Tue 03:0040
Tue 04:0036
Tue 05:0033
Tue 06:0033
Tue 07:00 · Now36
Tue 08:00 · Forecast41
Tue 09:00 · Forecast44
Tue 10:00 · Forecast47
Tue 11:00 · Forecast47
Tue 12:00 · Forecast45
Tue 13:00 · Forecast47
Tue 14:00 · Forecast49
Tue 15:00 · Forecast53
Tue 16:00 · Forecast53
Tue 17:00 · Forecast54
Tue 18:00 · Forecast54
Tue 19:00 · Forecast55
Tue 20:00 · Forecast56
Tue 21:00 · Forecast56
Tue 22:00 · Forecast56
Tue 23:00 · Forecast55
Wed 00:00 · Forecast55
Wed 01:00 · Forecast54
Wed 02:00 · Forecast54
Wed 03:00 · Forecast53
Wed 04:00 · Forecast52
Wed 05:00 · Forecast51
Wed 06:00 · Forecast51
Wed 07:00 · Forecast52
Wed 08:00 · Forecast53
Wed 09:00 · Forecast55
Wed 10:00 · Forecast56
Wed 11:00 · Forecast56
Wed 12:00 · Forecast56
Wed 13:00 · Forecast57
Wed 14:00 · Forecast58
Wed 15:00 · Forecast59
Wed 16:00 · Forecast59
Wed 17:00 · Forecast59
Wed 18:00 · Forecast58
Wed 19:00 · Forecast58
Wed 20:00 · Forecast56
Wed 21:00 · Forecast53
Wed 22:00 · Forecast49
Wed 23:00 · Forecast44
Thu 00:00 · Forecast38
Thu 01:00 · Forecast32
Thu 02:00 · Forecast30

Pollutants this hour

  • PM2.5 7.0 µg/m³ 24-hour mean 11.6 µg/m³ · within WHO’s 24-hour guideline (15) 36
  • PM10 8 µg/m³ 6
  • O₃ 53 µg/m³ 25
  • NO₂ 21 µg/m³ 10
  • SO₂ 5 µg/m³ 1
  • CO 0.23 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
Mississauga Ontario 34
Ottawa Ontario 55
Montreal Quebec 57
Columbus United States 27
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 Toronto’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 Toronto right now?
36 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 Toronto 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 Toronto get better or worse tomorrow?
Over the next 24 hours the model expects the AQI to range from 41 around 08:00 to 56 around 20:00 (3 Nov). Forecasts beyond a day are less certain.

How does Toronto compare with other cities?
Right now it is the 738th most polluted of 849 cities we track worldwide, and 6th of 8 in Canada, all on the same US EPA scale.

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