SmogRank / Canada / Northwest Territories

Air quality in Yellowknife

Northwest Territories, Canada. PM2.5 from 3 low-cost sensors, updated hourly.

0.0 µg/m³
Good

Latest hour (04:00 UTC), 0.0× the WHO 24-hour guideline.

Rank

24 h
–
not enough data
7 days
#2,326
of 2,330 · 0.2 µg/m³
30 days
#2,325
of 2,327 · 0.3 µg/m³
Year
#1,688
of 2,160 · 7.2 µg/m³

Why it ranks here

Seasonal. Over the past year its worst months were July, averaging up to 37.2 µg/m³ against 0.3 in its cleanest month. Seasonal peaks usually come from heating, crop burning, fire or dust seasons.

Based on Yellowknife's own measurements; causes are the usual kinds for a pattern like this, not a confirmed source.

Last 4 days, hour by hour

15302026-10-01 00:00 UTC: 0.1 µg/m³2026-10-01 01:00 UTC: 0.1 µg/m³2026-10-01 02:00 UTC: 0.0 µg/m³2026-10-01 03:00 UTC: 0.0 µg/m³2026-10-01 04:00 UTC: 0.0 µg/m³Sep 28Sep 29Sep 30Oct 1

Times in UTC. Dashed line: WHO 24-hour guideline (15 µg/m³).

Every day for a year

SepNovDecJanFebMarAprMayJunJulAugSepMonWedFri2025-09-29: 17.7 µg/m³2025-09-30: 26.9 µg/m³2025-10-01: 7.5 µg/m³2025-10-02: 3.8 µg/m³2025-10-03: 8.0 µg/m³2025-10-04: 1.0 µg/m³2025-10-05: 5.3 µg/m³2025-10-06: 1.8 µg/m³2025-10-07: 2.8 µg/m³2025-10-08: 2.8 µg/m³2025-10-09: 13.8 µg/m³2025-10-10: 3.3 µg/m³2025-10-11: 1.2 µg/m³2025-10-12: 1.9 µg/m³2025-10-13: 1.2 µg/m³2025-10-14: 6.2 µg/m³2025-10-15: 0.7 µg/m³2025-10-16: 0.6 µg/m³2025-10-17: 1.2 µg/m³2025-10-18: 0.7 µg/m³2025-10-19: 2.8 µg/m³2025-10-20: 2.6 µg/m³2025-10-21: 2.9 µg/m³2025-10-22: 3.9 µg/m³2025-10-23: 1.1 µg/m³2025-10-24: 2.0 µg/m³2025-10-25: 3.6 µg/m³2025-10-26: 3.3 µg/m³2025-10-27: 3.9 µg/m³2025-10-28: 4.5 µg/m³2025-10-29: 3.2 µg/m³2025-10-30: 1.1 µg/m³2025-10-31: 2.6 µg/m³2025-11-01: 3.4 µg/m³2025-11-02: 2.9 µg/m³2025-11-03: 1.1 µg/m³2025-11-04: 4.2 µg/m³2025-11-05: 4.4 µg/m³2025-11-06: 0.5 µg/m³2025-11-07: 0.0 µg/m³2025-11-08: 0.5 µg/m³2025-11-09: 4.7 µg/m³2025-11-10: 4.8 µg/m³2025-11-11: 1.7 µg/m³2025-11-12: 6.2 µg/m³2025-11-13: 5.2 µg/m³2025-11-14: 7.0 µg/m³2025-11-15: 4.3 µg/m³2025-11-16: 1.6 µg/m³2025-11-17: 2.7 µg/m³2025-11-18: 8.1 µg/m³2025-11-19: 4.9 µg/m³2025-11-20: 1.8 µg/m³2025-11-21: 3.0 µg/m³2025-11-22: 14.1 µg/m³2025-11-23: 4.4 µg/m³2025-11-24: 2.0 µg/m³2025-11-25: 2.8 µg/m³2025-11-26: 3.3 µg/m³2025-11-27: 2.1 µg/m³2025-11-28: 3.0 µg/m³2025-11-29: 7.1 µg/m³2025-11-30: 5.1 µg/m³2025-12-01: 5.1 µg/m³2025-12-02: 2.4 µg/m³2025-12-03: 4.5 µg/m³2025-12-04: 2.4 µg/m³2025-12-05: 2.8 µg/m³2025-12-06: 4.5 µg/m³2025-12-07: 2.5 µg/m³2025-12-08: 2.6 µg/m³2025-12-09: 8.5 µg/m³2025-12-10: 4.4 µg/m³2025-12-11: 1.6 µg/m³2025-12-12: 2.7 µg/m³2025-12-13: 2.8 µg/m³2025-12-14: 3.8 µg/m³2025-12-15: 2.6 µg/m³2025-12-16: 3.0 µg/m³2025-12-17: 2.4 µg/m³2025-12-18: 2.8 µg/m³2025-12-19: 1.5 µg/m³2025-12-20: 0.5 µg/m³2025-12-21: 1.1 µg/m³2025-12-22: 1.9 µg/m³2025-12-23: 1.5 µg/m³2025-12-24: 1.4 µg/m³2025-12-25: 2.0 µg/m³2025-12-26: 1.9 µg/m³2025-12-27: 3.3 µg/m³2025-12-28: 1.7 µg/m³2025-12-29: 0.9 µg/m³2025-12-30: 1.7 µg/m³2025-12-31: 0.5 µg/m³2026-01-01: 1.4 µg/m³2026-01-02: 0.8 µg/m³2026-01-03: 1.6 µg/m³2026-01-04: 1.1 µg/m³2026-01-05: 2.1 µg/m³2026-01-06: 1.4 µg/m³2026-01-07: 1.1 µg/m³2026-01-08: 1.6 µg/m³2026-01-09: 2.4 µg/m³2026-01-10: 1.4 µg/m³2026-01-11: 3.7 µg/m³2026-01-12: 2.0 µg/m³2026-01-13: 1.8 µg/m³2026-01-14: 0.9 µg/m³2026-01-15: 2.0 µg/m³2026-01-16: 1.3 µg/m³2026-01-17: 4.2 µg/m³2026-01-18: 4.7 µg/m³2026-01-19: 2.0 µg/m³2026-01-20: 2.2 µg/m³2026-01-21: 5.4 µg/m³2026-01-22: 2.7 µg/m³2026-01-23: 1.2 µg/m³2026-01-24: 1.1 µg/m³2026-01-25: 3.3 µg/m³2026-01-26: 4.1 µg/m³2026-01-27: 2.4 µg/m³2026-01-28: 0.8 µg/m³2026-01-29: 1.5 µg/m³2026-01-30: 2.6 µg/m³2026-01-31: 1.7 µg/m³2026-02-01: 0.6 µg/m³2026-02-02: 2.8 µg/m³2026-02-03: 1.0 µg/m³2026-02-04: 2.5 µg/m³2026-02-05: 2.1 µg/m³2026-02-06: 1.8 µg/m³2026-02-07: 2.8 µg/m³2026-02-08: 2.1 µg/m³2026-02-09: 1.7 µg/m³2026-02-10: 1.3 µg/m³2026-02-11: 0.8 µg/m³2026-02-12: 3.0 µg/m³2026-02-13: 4.6 µg/m³2026-02-14: 2.8 µg/m³2026-02-15: 2.0 µg/m³2026-02-16: 2.8 µg/m³2026-02-17: 1.3 µg/m³2026-02-18: 1.3 µg/m³2026-02-19: 0.3 µg/m³2026-02-20: 1.8 µg/m³2026-02-21: 1.4 µg/m³2026-02-22: 1.4 µg/m³2026-02-23: 1.0 µg/m³2026-02-24: 2.6 µg/m³2026-02-25: 3.5 µg/m³2026-02-26: 2.1 µg/m³2026-02-27: 1.1 µg/m³2026-02-28: 2.0 µg/m³2026-03-01: 2.0 µg/m³2026-03-02: 1.1 µg/m³2026-03-03: 1.8 µg/m³2026-03-04: 1.0 µg/m³2026-03-05: 1.4 µg/m³2026-03-06: 2.6 µg/m³2026-03-07: 1.6 µg/m³2026-03-08: 1.4 µg/m³2026-03-09: 3.4 µg/m³2026-03-10: 2.3 µg/m³2026-03-11: 1.8 µg/m³2026-03-12: 1.2 µg/m³2026-03-13: 1.1 µg/m³2026-03-14: 2.8 µg/m³2026-03-15: 1.7 µg/m³2026-03-16: 0.7 µg/m³2026-03-17: 1.2 µg/m³2026-03-18: 2.4 µg/m³2026-03-19: 1.3 µg/m³2026-03-20: 3.1 µg/m³2026-03-21: 3.4 µg/m³2026-03-22: 1.7 µg/m³2026-03-23: 1.9 µg/m³2026-03-24: 3.1 µg/m³2026-03-25: 1.9 µg/m³2026-03-26: 1.6 µg/m³2026-03-27: 3.7 µg/m³2026-03-28: 4.3 µg/m³2026-03-29: 2.4 µg/m³2026-03-30: 3.6 µg/m³2026-03-31: 2.2 µg/m³2026-04-01: 2.2 µg/m³2026-04-02: 2.1 µg/m³2026-04-03: 4.5 µg/m³2026-04-04: 3.6 µg/m³2026-04-05: 1.9 µg/m³2026-04-06: 4.7 µg/m³2026-04-07: no data2026-04-08: 3.8 µg/m³2026-04-09: 3.7 µg/m³2026-04-10: 4.4 µg/m³2026-04-11: 1.5 µg/m³2026-04-12: 2.9 µg/m³2026-04-13: 1.5 µg/m³2026-04-14: 2.6 µg/m³2026-04-15: 1.5 µg/m³2026-04-16: 2.7 µg/m³2026-04-17: 1.9 µg/m³2026-04-18: 2.4 µg/m³2026-04-19: 1.1 µg/m³2026-04-20: 2.5 µg/m³2026-04-21: 5.0 µg/m³2026-04-22: 5.7 µg/m³2026-04-23: 1.7 µg/m³2026-04-24: 1.3 µg/m³2026-04-25: 2.6 µg/m³2026-04-26: 1.8 µg/m³2026-04-27: 0.7 µg/m³2026-04-28: 1.8 µg/m³2026-04-29: 2.3 µg/m³2026-04-30: 0.9 µg/m³2026-05-01: 1.1 µg/m³2026-05-02: 0.6 µg/m³2026-05-03: 0.4 µg/m³2026-05-04: 1.4 µg/m³2026-05-05: 2.2 µg/m³2026-05-06: 0.5 µg/m³2026-05-07: 0.7 µg/m³2026-05-08: 0.5 µg/m³2026-05-09: 0.2 µg/m³2026-05-10: 1.9 µg/m³2026-05-11: 2.4 µg/m³2026-05-12: 0.6 µg/m³2026-05-13: 0.1 µg/m³2026-05-14: 0.2 µg/m³2026-05-15: 0.4 µg/m³2026-05-16: no data2026-05-17: no data2026-05-18: no data2026-05-19: no data2026-05-20: no data2026-05-21: no data2026-05-22: no data2026-05-23: no data2026-05-24: no data2026-05-25: no data2026-05-26: no data2026-05-27: no data2026-05-28: no data2026-05-29: no data2026-05-30: no data2026-05-31: no data2026-06-01: no data2026-06-02: no data2026-06-03: no data2026-06-04: 23.0 µg/m³2026-06-05: 10.2 µg/m³2026-06-06: 0.3 µg/m³2026-06-07: 0.1 µg/m³2026-06-08: 0.1 µg/m³2026-06-09: 0.1 µg/m³2026-06-10: 0.1 µg/m³2026-06-11: 0.1 µg/m³2026-06-12: 0.2 µg/m³2026-06-13: 0.9 µg/m³2026-06-14: 0.4 µg/m³2026-06-15: 0.4 µg/m³2026-06-16: 0.1 µg/m³2026-06-17: 0.1 µg/m³2026-06-18: 0.1 µg/m³2026-06-19: 0.0 µg/m³2026-06-20: 0.0 µg/m³2026-06-21: 0.0 µg/m³2026-06-22: 0.2 µg/m³2026-06-23: 1.0 µg/m³2026-06-24: 3.2 µg/m³2026-06-25: 6.8 µg/m³2026-06-26: no data2026-06-27: no data2026-06-28: no data2026-06-29: no data2026-06-30: no data2026-07-01: 70.9 µg/m³2026-07-02: 62.0 µg/m³2026-07-03: 52.1 µg/m³2026-07-04: 2.4 µg/m³2026-07-05: 47.2 µg/m³2026-07-06: 131.0 µg/m³2026-07-07: 34.2 µg/m³2026-07-08: 22.8 µg/m³2026-07-09: 1.2 µg/m³2026-07-10: 0.3 µg/m³2026-07-11: 0.4 µg/m³2026-07-12: 0.5 µg/m³2026-07-13: 21.0 µg/m³2026-07-14: 82.9 µg/m³2026-07-15: 51.1 µg/m³2026-07-16: 21.5 µg/m³2026-07-17: 103.5 µg/m³2026-07-18: 25.3 µg/m³2026-07-19: 171.0 µg/m³2026-07-20: 35.5 µg/m³2026-07-21: 67.4 µg/m³2026-07-22: 53.3 µg/m³2026-07-23: 11.7 µg/m³2026-07-24: 13.2 µg/m³2026-07-25: 13.9 µg/m³2026-07-26: 3.3 µg/m³2026-07-27: 15.6 µg/m³2026-07-28: 10.8 µg/m³2026-07-29: 12.2 µg/m³2026-07-30: 10.0 µg/m³2026-07-31: 5.8 µg/m³2026-08-01: 4.5 µg/m³2026-08-02: 0.1 µg/m³2026-08-03: 0.4 µg/m³2026-08-04: 11.7 µg/m³2026-08-05: 0.1 µg/m³2026-08-06: 0.7 µg/m³2026-08-07: 0.5 µg/m³2026-08-08: 0.7 µg/m³2026-08-09: 1.4 µg/m³2026-08-10: 6.9 µg/m³2026-08-11: 8.2 µg/m³2026-08-12: 5.6 µg/m³2026-08-13: 8.7 µg/m³2026-08-14: 10.8 µg/m³2026-08-15: 28.2 µg/m³2026-08-16: 0.8 µg/m³2026-08-17: 2.6 µg/m³2026-08-18: 4.2 µg/m³2026-08-19: 46.5 µg/m³2026-08-20: 8.5 µg/m³2026-08-21: 34.2 µg/m³2026-08-22: 29.2 µg/m³2026-08-23: 32.0 µg/m³2026-08-24: 17.9 µg/m³2026-08-25: 1.6 µg/m³2026-08-26: 4.1 µg/m³2026-08-27: 9.9 µg/m³2026-08-28: 1.1 µg/m³2026-08-29: 1.1 µg/m³2026-08-30: 0.4 µg/m³2026-08-31: 0.5 µg/m³2026-09-01: 0.3 µg/m³2026-09-02: 0.4 µg/m³2026-09-03: 1.0 µg/m³2026-09-04: 0.2 µg/m³2026-09-05: 0.7 µg/m³2026-09-06: 0.0 µg/m³2026-09-07: 1.0 µg/m³2026-09-08: 0.0 µg/m³2026-09-09: 0.8 µg/m³2026-09-10: 0.0 µg/m³2026-09-11: 0.1 µg/m³2026-09-12: 0.2 µg/m³2026-09-13: 0.1 µg/m³2026-09-14: 0.0 µg/m³2026-09-15: 0.1 µg/m³2026-09-16: 0.1 µg/m³2026-09-17: 0.2 µg/m³2026-09-18: 0.2 µg/m³2026-09-19: 0.1 µg/m³2026-09-20: 0.3 µg/m³2026-09-21: 0.0 µg/m³2026-09-22: 1.0 µg/m³2026-09-23: 0.3 µg/m³2026-09-24: 0.1 µg/m³2026-09-25: 0.2 µg/m³2026-09-26: 0.0 µg/m³2026-09-27: 0.1 µg/m³2026-09-28: 0.3 µg/m³2026-09-29: 0.2 µg/m³2026-09-30: 0.1 µg/m³
Good 0–9.0Moderate 9.1+Unhealthy for sensitive groups 35.5+Unhealthy 55.5+Very unhealthy 125.5+Hazardous 225.5+No data

25 of 340 measured days were over the WHO 24-hour guideline.

Daily world rank

#1#2509OctNovDecJanFebMarAprMayJunJulAugSep

Rank on each day's board (1 = most polluted city that day).

2026 against 2025, month by month

15Jan 2026: 2.1 µg/m³JanFeb 2026: 1.9 µg/m³FebMar 2026: 2.1 µg/m³MarApr 2026: 2.6 µg/m³AprMay 2026: 0.9 µg/m³MayJun 2026: 2.2 µg/m³JunJul 2026: 37.2 µg/m³JulAug 2026: 9.1 µg/m³AugSep 2025: 30.0 µg/m³Sep 2026: 0.3 µg/m³SepOct 2025: 3.3 µg/m³OctNov 2025: 3.9 µg/m³NovDec 2025: 2.6 µg/m³Dec

Faded bars: 2025. A month shows once it has 10 measured days.

This week against past years

This weekThis week: 0.1 µg/m³0.120252025: 35.9 µg/m³35.9

Mean PM2.5 for 24 Sept to 30 Sept in each year. Dashed line: WHO 24-hour guideline.

Monitors

StationOperatorType
Con Area YellowknifeCC BY 4.0AirGradientLow-cost
Niven Area YellowknifeCC BY 4.0AirGradientLow-cost
Niven Area Mc. YellowknifeCC BY 4.0AirGradientLow-cost

No reference monitor here, so the value is the median of low-cost sensors (at least two reporting each hour). Low-cost sensors can read high in humid air. Data via OpenAQ; licences as listed. How we rank. Embed this on your site.

Other cities in Canada

Kamloops 8.4Chilliwack 7.5Vernon 7.3Edmonton 7.2Red Deer 7.2Calgary 7.1Prince George 7.0Abbotsford 6.7Kelowna 6.6Sorel-Tracy 6.1Harewood 6.1Squamish 6.0

30-day averages, µg/m³. All of Canada →

Updated 2026-10-01 05:07 UTC. Values are PM2.5 in µg/m³ (fine particles), the median of each city's monitors.