AirNow by Skymory

Canada · America/Toronto

Ottawa air quality

46

Good

CAMS model-based US AQI estimate

Highest pollutant sub-index: PM2.5

Model values for Oct 02 03:00 EDT · CAMS model estimate, may differ from monitoring stations and street-level conditions

Data may be delayed

AirNow by Skymory is an independent service; it is not affiliated with or endorsed by U.S. EPA or the official AirNow service.

Pollutants now (modeled)

  • PM2.5Fine particles6.9 µg/m³
  • PM10Coarse particles6.9 µg/m³
  • O3Ozone46.3 µg/m³
  • NO2Nitrogen dioxide11.4 µg/m³
  • SO2Sulphur dioxide2.3 µg/m³
  • COCarbon monoxide275.5 µg/m³

Weather in Ottawa

See the temperature, rain and wind forecast for Ottawa.

Ottawa weather forecast on Skymory

Next 24 hours: PM2.5

Modeled PM2.5 forecast (µg/m³)Actual model samples spaced by their valid times. Range 0.7 to 5.8. Forecast, not observations.Oct 02 04:00 EDTOct 03 03:00 EDT
Modeled PM2.5 forecast (µg/m³) · 0.7–5.8; actual sample times, no interpolated hourly values.

Pollutant forecast

Hourly model samples in local time; no interpolation.

Local timePM2.5 µg/m³PM10 µg/m³O3 µg/m³NO2 µg/m³SO2 µg/m³CO µg/m³
5.85.847.79.82.2263.7
4.24.250.07.92.1246.4
2.92.949.86.91.8233.5
2.02.050.16.41.6225.4
1.81.849.07.31.6228.2
2.02.146.49.01.6237.7
2.22.346.18.61.6233.9
2.22.249.86.11.6211.5
2.02.054.54.11.5186.1
1.81.959.82.81.4166.3
1.71.966.41.81.3151.7
1.51.770.21.21.2141.6
1.41.669.61.21.2139.5
1.61.763.92.41.2148.6
2.12.353.76.61.5176.2
3.03.244.213.21.9215.0
2.93.045.312.22.0208.5
2.02.152.16.91.7175.1
1.41.456.33.71.3156.0
1.21.255.72.91.1151.7
1.11.153.62.71.0151.3
0.91.051.72.30.8150.2
0.80.849.72.00.7149.3
0.70.747.81.80.7149.4
Data details: about this air quality estimate

Values are modeled by the Copernicus Atmosphere Monitoring Service (CAMS) global forecast, extracted and converted by Skymory for this city. They are model estimates on a coarse grid, not measurements from monitoring stations, and they do not resolve street-level exposure.

  • Model initialization: 2026-10-01T12:00:00+00:00. Values valid: Oct 02 03:00 EDT. Retrieved: 2026-10-02T04:52:32.865491+00:00.
  • Page generated from a snapshot with data state STALE_USABLE; model age 19.9 hours at generation.
  • Nearest valid 0.4° model grid cell, about 22 km from the city point.
  • Gases are converted with matching model-level 137 temperature, humidity, surface pressure (lnsp) and hybrid coefficients; particulate matter is read directly from the surface fields.
  • AQI estimate completeness: COMPLETE (COMPLETE means all six pollutants have a complete model window).

The AQI estimate applies EPA breakpoints (May 2026) to explicit trailing model windows (PM 24 h, CO 8 h, NO2 1 h, SO2 and O3 per EPA rules). It is not a station observation, official daily maximum or NowCast, and the official AQI field remains unavailable.

Averaging windows used

  • CO: 8h window
  • NO2: 1h window
  • O3: 1h, 8h window
  • PM10: 24h window
  • PM2.5: 24h window
  • SO2: 1h, 24h window

Surface compatibility by pollutant

PollutantSurface compatibility
PM2.5DIRECT_SURFACE
PM10DIRECT_SURFACE
O3DERIVABLE_SURFACE
NO2DERIVABLE_SURFACE
SO2DERIVABLE_SURFACE
CODERIVABLE_SURFACE

Source and license

Contains modified Copernicus Atmosphere Monitoring Service information 2026; city extraction and concentration conversion. CAMS global atmospheric composition forecasts (ECMWF/CAMS). CC BY 4.0.

Provider times stay separate from page generation: collecting data or regenerating this page never resets the source time. Data sources and methodology

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