Calgary air quality
Alberta, Canada · Live AQI and hourly forecast for the next 5 days · updated Sat 17:00 local time
Good
Great air. A perfect time to be outside.
- Next 24 hours
- 24–33US AQI, highest around Sun 12:00
- Best time outside
- Sat 21:00–0:00US AQI about 24
- PM2.5 vs WHO guideline
- 0.4×5.5 µg/m³ over 24 h, guideline 15
- Cigarette equivalent
- ≈ 0.3 a dayBerkeley Earth rule of thumb
- European AQI
- Goodlevel 1 of 6
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Pollutants in Calgary right now
| Pollutant | Now | Next 24 h vs WHO | US AQI band |
|---|---|---|---|
| Fine particles (PM2.5) | 3.0 µg/m³ | 0.4× | Good |
| Coarse particles (PM10) | 3.0 µg/m³ | 0.1× | Good |
| Nitrogen dioxide (NO2) | 8.9 µg/m³ | 0.7× | Good |
| Ozone (O3) | 56 µg/m³ | 0.6× | Good |
| Sulphur dioxide (SO2) | 2.9 µg/m³ | 0.1× | Good |
| Carbon monoxide (CO) | 167 µg/m³ | 0.1× | Good |
| Desert dust | 0 µg/m³ | ||
| Smoke and haze (aerosol optical depth) | 0.08 | ||
| UV index | 0.6 |
“Next 24 h vs WHO” compares the forecast with the World Health Organization’s 2021 guideline levels: 24-hour means of 15 µg/m³ for PM2.5, 45 for PM10, 25 for NO2, 40 for SO2 and 4 mg/m³ for CO, and 100 µg/m³ over 8 hours for ozone. Above 1× is above the guideline.
Next 48 hours
Hourly US AQI. Highest 33 around Sun 12:00, lowest 24 around Sat 22:00.
5-day air quality forecast for Calgary
Daily range of the hourly US AQI, from lowest to highest, on a scale of 0 to 150.
| Day | US AQI | At worst | PM2.5 avg | |
|---|---|---|---|---|
| Sat 26 Sept | 24–52 | 4.4 | ||
| Sun 27 Sept | 25–33 | 5.5 | ||
| Mon 28 Sept | 27–36 | 5.2 | ||
| Tue 29 Sept | 22–30 | 3.8 | ||
| Wed 30 Sept | 20–36 | 3.1 |
Common questions about the air in Calgary
Is the air in Calgary safe today?
Yes. Right now the US AQI in Calgary is 29, which counts as good. Great air. A perfect time to be outside.
When is the best time to be outside in Calgary?
Sat 21:00–0:00. That is the cleanest stretch in the next 24 hours, with the US AQI averaging about 24. The worst hour is around Sun 12:00, at 33.
What is the main pollutant in Calgary?
Ozone (O3). It drives the index right now, at 56 µg/m³. Formed by sunlight acting on traffic and plant emissions. Highest on hot, still afternoons, often downwind of cities.
How does Calgary's air compare with the WHO guideline?
Within the guideline. Over the next 24 hours PM2.5 averages about 5.5 µg/m³, against the World Health Organization's 24-hour guideline of 15 µg/m³. The other pollutants stay within their guideline levels.
How many cigarettes is a day of Calgary's air?
About 0.3 cigarettes. Over the next 24 hours PM2.5 averages about 5.5 µg/m³. By Berkeley Earth's rule of thumb, 22 µg/m³ breathed for a day is roughly one cigarette.
Will air quality in Calgary improve this week?
Tuesday looks cleanest. Its AQI peaks at 30, against 52 on Saturday, the worst day in the forecast.
Measured near Calgary
| Station | PM2.5 µg/m³ | Measured |
|---|---|---|
| Calgary Central2 AirNow, reference monitor | 0.8 | Sat 16:00 |
| Calgary Northwest AirNow, reference monitor | 0.8 | Sat 16:00 |
| Unnamed sensor Sensor.Community, low-cost sensor | 0.2 | Sat 17:45 |
Air quality near Calgary
- Edmonton 281 km N
- Vancouver 673 km W
- Seattle 710 km SW
- Portland 884 km SW
- Salt Lake City 1,156 km S
- Denver 1,441 km SE
About this forecast
Forecast from CAMS global via Open-Meteo: the Copernicus Atmosphere Monitoring Service (CAMS) model at about 40 km resolution (10 km inside Europe), refreshed twice a day. Models smooth out street-level peaks, so busy roads and industrial sites can be worse than shown; ground stations, where there are any nearby, show what monitors actually measure. The US AQI follows the US EPA scale and the European AQI the EEA bands. Readings for 51.04°N, 114.07°W, updated 2026-09-26 23:00 UTC.