Yellowknife, Northwest Territories, Canada Historical Air Quality Analysis
Dive into detailed Air Quality Insights with historical data, monthly patterns, and yearly trends at your fingertips!
October Air Quality Analysis
Yellowknife, Northwest Territories, Canada
AQI Trends: Highest and Lowest
Same Day Analysis (15th October ):
On this day, AQI across the 5 years varied significantly: 2025 ranks 2nd highest AQI at 34 of Good air quality, showing improvement over 2023 on the same day.
Download 2024 Annual Data
World Air Quality Report

Day & Night AQI Trend: 15th Oct - 16th Oct 2025
Yellowknife, Northwest Territories, Canada
7 AM15th Oct 2025
7 PM
6 AM16th Oct 2025
45AQI
26AQI
39AQI
25AQI
In the last 24 hours,
Yellowknife's AQI reached its highest point of 45 at 9 AM during the Day, while the lowest point, 25, was recorded at 10 PM during the Night between 15th Oct and 16th Oct 2025.
Day & Night AQI Trend : Sep - Oct 2025
Yellowknife, Northwest Territories, Canada
11°C8/13°C
14°C9/20°C
15°C12/18°C
12°C9/15°C
12°C9/17°C
15°C13/18°C
11°C7/14°C
10°C8/13°C
8°C7/10°C
9°C6/12°C
9°C5/13°C
9°C5/13°C
8°C5/12°C
9°C5/12°C
9°C6/12°C
7°C4/10°C
7°C3/9°C
8°C5/10°C
3°C0/4°C
0°C-3/2°C
-2°C-5/2°C
3°C-1/7°C
5°C3/8°C
5°C3/8°C
4°C2/6°C
2°C0/3°C
0°C-1/3°C
3°C1/5°C
4°C2/7°C
5°C3/9°C
--°C/°C
43AQI
36AQI
38AQI
35AQI
2025 Days Vs Air Quality
Yellowknife, Northwest Territories, Canada
93%
269
6%
17
0.6%
2
Total number of days with different AQI categories in last 289 days in 2025 (76 days remaining)
Under WHO’s Safe Air Quality Limits: 93%
Health Risk Level:
Very Low
In 2025, 93% of 289 days were within WHO’s safe air quality limits. The risk of health issues is Very Low, but health impacts are still unclear.
Annual Air Quality Insights
Yellowknife, Northwest Territories, Canada
AQI levels in 2025
Jan.
Feb.
Mar.
Apr.
May
Jun.
Jul.
Aug.
Sep.
Oct.
Nov.
Dec.
36AQI
37AQI
52AQI
56AQI
41AQI
51AQI
50AQI
46AQI
39AQI
41AQI
32AQI
45AQI
46AQI
46AQI
28AQI
35AQI
32AQI
28AQI
28AQI
25AQI
28AQI
29AQI
29AQI
34AQI
29AQI
37AQI
29AQI
27AQI
30AQI
35AQI
39AQI
31AQI
30AQI
34AQI
31AQI
30AQI
49AQI
53AQI
44AQI
31AQI
33AQI
32AQI
34AQI
28AQI
26AQI
31AQI
42AQI
48AQI
42AQI
29AQI
35AQI
29AQI
30AQI
26AQI
22AQI
27AQI
35AQI
27AQI
24AQI
28AQI
28AQI
28AQI
32AQI
27AQI
27AQI
31AQI
24AQI
24AQI
30AQI
49AQI
28AQI
30AQI
27AQI
30AQI
32AQI
39AQI
33AQI
34AQI
37AQI
33AQI
29AQI
32AQI
32AQI
34AQI
26AQI
28AQI
30AQI
20AQI
24AQI
24AQI
21AQI
23AQI
19AQI
22AQI
17AQI
15AQI
17AQI
19AQI
29AQI
50AQI
35AQI
23AQI
25AQI
22AQI
21AQI
20AQI
20AQI
22AQI
15AQI
14AQI
16AQI
17AQI
16AQI
17AQI
17AQI
16AQI
18AQI
18AQI
17AQI
19AQI
23AQI
21AQI
17AQI
22AQI
20AQI
24AQI
17AQI
17AQI
18AQI
18AQI
17AQI
22AQI
20AQI
20AQI
22AQI
26AQI
18AQI
16AQI
26AQI
22AQI
21AQI
28AQI
19AQI
19AQI
19AQI
22AQI
18AQI
18AQI
50AQI
48AQI
104AQI
122AQI
27AQI
24AQI
17AQI
57AQI
28AQI
18AQI
17AQI
46AQI
27AQI
29AQI
29AQI
24AQI
22AQI
20AQI
23AQI
22AQI
20AQI
21AQI
21AQI
28AQI
31AQI
39AQI
35AQI
39AQI
40AQI
36AQI
38AQI
39AQI
26AQI
21AQI
32AQI
22AQI
25AQI
29AQI
41AQI
56AQI
43AQI
31AQI
32AQI
27AQI
30AQI
31AQI
33AQI
34AQI
38AQI
52AQI
58AQI
44AQI
36AQI
28AQI
27AQI
30AQI
31AQI
25AQI
24AQI
22AQI
26AQI
47AQI
42AQI
45AQI
43AQI
50AQI
37AQI
39AQI
35AQI
37AQI
30AQI
32AQI
33AQI
40AQI
25AQI
30AQI
34AQI
34AQI
28AQI
25AQI
23AQI
28AQI
29AQI
25AQI
28AQI
26AQI
26AQI
51AQI
47AQI
46AQI
43AQI
41AQI
46AQI
40AQI
50AQI
57AQI
50AQI
61AQI
32AQI
43AQI
53AQI
39AQI
37AQI
30AQI
44AQI
31AQI
46AQI
37AQI
30AQI
36AQI
33AQI
43AQI
44AQI
35AQI
42AQI
42AQI
27AQI
26AQI
22AQI
25AQI
57AQI
67AQI
40AQI
47AQI
52AQI
56AQI
47AQI
51AQI
24AQI
32AQI
20AQI
30AQI
30AQI
42AQI
31AQI
33AQI
25AQI
26AQI
31AQI
34AQI
37AQI
33AQI
30AQI
21AQI
25AQI
32AQI
34AQI
36AQI
41AQI
34AQI
No. of days
202532AQI
Highest AQI recorded in
September41AQI
Lowest AQI recorded in
April21AQI
202428AQI
Highest AQI recorded in
December49AQI
Lowest AQI recorded in
October17AQI
202351AQI
Highest AQI recorded in
September124AQI
Lowest AQI recorded in
December19AQI
202222AQI
Highest AQI recorded in
August51AQI
Lowest AQI recorded in
May15AQI
202118AQI
Highest AQI recorded in
July26AQI
Lowest AQI recorded in
September11AQI
202016AQI
Highest AQI recorded in
March23AQI
Lowest AQI recorded in
September12AQI
Most & Least Polluted Years Over the Last 6 Years
Yellowknife's annual 2025 AQI (32) shows an average percentage change of 41.6% (worsened AQI) compared to previous years: 2020 (16), 2021 (18), 2022 (22), 2023 (51), 2024 (28).