SmogRank / World / North America / Canada / Alberta

Most polluted cities in Alberta, Canada

14 measured cities, this year; 14 above the WHO annual guideline. Worst: Calgary at 9.9 µg/m³, #1,016 in the world.

Ranked by unhealthy days: the share of each city's measured days with a daily mean over 35.4 µg/m³ (US AQI 101+), Unhealthy for Sensitive Groups or worse on the US EPA's scale. Ties go to the higher average.

Saskatchewan: 5 measured citiesNorthwest TerritoriesNunavutBritish Columbia: 35 measured citiesAlberta: 14 measured cities#14 Grand Centre: 6.0 µg/m³#13 Edson: 6.4 µg/m³#12 Grande Prairie: 6.5 µg/m³#11 St. Albert: 6.7 µg/m³#9 Fort McMurray: 6.9 µg/m³#10 Medicine Hat: 6.9 µg/m³#8 Sherwood Park: 7.0 µg/m³#7 Lethbridge: 7.1 µg/m³#6 Drayton Valley: 7.2 µg/m³#5 Airdrie: 7.4 µg/m³#4 Fort Saskatchewan: 8.8 µg/m³#3 Red Deer: 9.2 µg/m³#2 Edmonton: 9.5 µg/m³#1 Calgary: 9.9 µg/m³
Each dot is a measured city, coloured by its PM2.5; tap a dot to open the city.
← Calgary 3% 2%0
Every measured city in Alberta, Canada, one column each, ranked by unhealthy days: height is the share of its measured days that were unhealthy, colour its average. Point at it to read a city; tap to open it.
  1. 1Calgary 3%
  2. 2Grande Prairie 2%
  3. 3Lethbridge 2%
  4. 4Fort McMurray 2%
  5. 5Fort Saskatchewanlast full day 28 Sept 2%
  6. 6Airdrie 2%
  7. 7St. Albert 2%
  8. 8Grand Centre 2%
  9. 9Edmonton 2%
  10. 10Red Deerlast full day 2 Oct 1%
  11. 11Drayton Valley 1%
  12. 12Sherwood Park 1%
  13. 13Medicine Hat 1%
  14. 14Edson 1%
Good0–50
Moderate51–100
Sensitive groups101–150
Unhealthy151–200
Very unhealthy201–300
Hazardous301+

The US EPA's Air Quality Index for PM2.5 (2024 breakpoints). Show values as: µg/m³ · US AQI · India AQI · China AQI · European AQI · UK DAQI · Canada AQHI+. About the scales

Estimated: cities without a monitor

Alberta cities we can't measure, with model estimates for the last 7 days. Listed by population, not ranked: estimates aren't precise enough to rank. Model estimates from the Copernicus Atmosphere Monitoring Service (CAMS), adjusted to measured cities nearby where there are any. Adjusted, a single day lands within ×1.5 of what a monitor would read about two times in three; unadjusted, it can be off by half or double. Treat them as a guide, not a measurement.

City7-day estimateBand
Spruce Grove≈ 4 µg/m³Good
Chestermere≈ 9 µg/m³Moderate
Cochrane≈ 8 µg/m³Good
Lloydminster≈ 3 µg/m³Good
Okotoks≈ 7 µg/m³Good
Camrose≈ 3 µg/m³Good
Stony Plain≈ 4 µg/m³Good
Sylvan Lake≈ 3 µg/m³Good
Leduc≈ 3 µg/m³Good

Bad-air episodes in Alberta

Times when many cities around here had PM2.5 at twice their usual or more on the same days.

Use this board

SmogRank, most polluted cities in Alberta, Canada, PM2.5, this year to 6 Oct 2026, 22:00 UTC, smogrank.com/ca/region/alberta?w=year.

Download top 10 (PNG)

You're welcome to reuse a single chart, image or figure with this citation and a link. Terms. Raw monitor readings in bulk are published by OpenAQ, under each provider's licence.

Updated 2026-10-06 22:07 UTC. Values are PM2.5 (fine particles), the median of each city's monitors, as the US AQI PM2.5 sub-index.