Crofton Substation, North Cowichan, British Columbia, Canada Historical Air Quality Analysis
Dive into detailed Air Quality Insights with historical data, monthly patterns, and yearly trends at your fingertips!
September Air Quality Analysis
Crofton Substation, North Cowichan, British Columbia, Canada
AQI Trends: Highest and Lowest
Same Day Analysis (22nd September ):
On this day, AQI across the 5 years varied significantly: 2025 ranks 3rd highest AQI at 25 of Good air quality, showing improvement over 2023 and 2021 on the same day.
Download 2024 Annual Data
World Air Quality Report

Day & Night AQI Trend: 23rd Sep - 24th Sep 2025
Crofton Substation, North Cowichan, British Columbia, Canada
6 AM23rd Sep 2025
7 PM
5 AM24th Sep 2025
35AQI
25AQI
38AQI
30AQI
In the last 24 hours,
Crofton Substation's AQI reached its highest point of 38 at 2 AM during the Night, while the lowest point, undefined, was recorded at 5 AM during the Night between 23rd Sep and 24th Sep 2025.
Day & Night AQI Trend : Aug - Sep 2025
Crofton Substation, North Cowichan, British Columbia, Canada
24°C20/28°C
24°C19/28°C
21°C18/25°C
20°C18/24°C
21°C19/24°C
18°C16/21°C
20°C15/26°C
19°C16/22°C
19°C15/26°C
23°C19/29°C
22°C18/26°C
20°C17/24°C
20°C18/23°C
18°C16/20°C
17°C15/20°C
17°C14/21°C
18°C15/22°C
17°C14/20°C
16°C14/19°C
16°C14/19°C
16°C15/18°C
16°C14/18°C
19°C13/25°C
18°C15/22°C
17°C13/22°C
18°C13/24°C
17°C14/20°C
16°C13/20°C
15°C10/22°C
18°C11/26°C
--°C/°C
38AQI
38AQI
41AQI
39AQI
2025 Days Vs Air Quality
Crofton Substation, North Cowichan, British Columbia, Canada
94%
249
6%
16
Total number of days with different AQI categories in last 267 days in 2025 (98 days remaining)
Under WHO’s Safe Air Quality Limits: 94%
Health Risk Level:
Very Low
In 2025, 94% of 267 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
Crofton Substation, North Cowichan, British Columbia, Canada
AQI levels in 2025
Jan.
Feb.
Mar.
Apr.
May
Jun.
Jul.
Aug.
Sep.
Oct.
Nov.
Dec.
29AQI
29AQI
26AQI
29AQI
22AQI
24AQI
36AQI
38AQI
34AQI
31AQI
24AQI
32AQI
37AQI
39AQI
54AQI
43AQI
30AQI
37AQI
40AQI
40AQI
47AQI
51AQI
52AQI
37AQI
41AQI
47AQI
52AQI
54AQI
59AQI
51AQI
32AQI
20AQI
24AQI
30AQI
27AQI
29AQI
28AQI
29AQI
61AQI
50AQI
46AQI
29AQI
37AQI
34AQI
45AQI
42AQI
25AQI
29AQI
31AQI
22AQI
19AQI
31AQI
28AQI
17AQI
25AQI
18AQI
28AQI
27AQI
37AQI
36AQI
37AQI
28AQI
20AQI
20AQI
22AQI
21AQI
22AQI
34AQI
32AQI
35AQI
28AQI
24AQI
24AQI
22AQI
20AQI
25AQI
20AQI
25AQI
18AQI
19AQI
16AQI
16AQI
22AQI
22AQI
24AQI
17AQI
16AQI
15AQI
18AQI
22AQI
17AQI
20AQI
24AQI
25AQI
24AQI
25AQI
14AQI
15AQI
14AQI
18AQI
17AQI
18AQI
22AQI
20AQI
19AQI
20AQI
18AQI
21AQI
20AQI
18AQI
16AQI
15AQI
18AQI
22AQI
30AQI
30AQI
29AQI
21AQI
17AQI
19AQI
24AQI
29AQI
19AQI
16AQI
19AQI
22AQI
23AQI
17AQI
19AQI
22AQI
18AQI
19AQI
21AQI
17AQI
17AQI
15AQI
16AQI
13AQI
14AQI
12AQI
13AQI
16AQI
16AQI
14AQI
16AQI
17AQI
15AQI
20AQI
14AQI
17AQI
16AQI
15AQI
18AQI
20AQI
17AQI
21AQI
18AQI
18AQI
23AQI
23AQI
25AQI
34AQI
30AQI
25AQI
21AQI
19AQI
19AQI
17AQI
15AQI
17AQI
18AQI
19AQI
19AQI
22AQI
35AQI
27AQI
18AQI
16AQI
15AQI
20AQI
22AQI
23AQI
18AQI
17AQI
20AQI
20AQI
20AQI
23AQI
21AQI
16AQI
17AQI
21AQI
19AQI
22AQI
19AQI
23AQI
34AQI
38AQI
37AQI
26AQI
24AQI
26AQI
24AQI
23AQI
25AQI
18AQI
21AQI
25AQI
28AQI
31AQI
32AQI
25AQI
22AQI
19AQI
25AQI
40AQI
31AQI
41AQI
19AQI
19AQI
27AQI
27AQI
24AQI
24AQI
21AQI
21AQI
21AQI
12AQI
17AQI
21AQI
25AQI
20AQI
26AQI
26AQI
30AQI
40AQI
47AQI
53AQI
53AQI
51AQI
56AQI
38AQI
46AQI
43AQI
40AQI
61AQI
59AQI
58AQI
54AQI
31AQI
31AQI
39AQI
29AQI
34AQI
25AQI
26AQI
35AQI
23AQI
27AQI
45AQI
27AQI
27AQI
27AQI
26AQI
25AQI
39AQI
31AQI
23AQI
20AQI
18AQI
21AQI
24AQI
30AQI
36AQI
No. of days
202527AQI
Highest AQI recorded in
January39AQI
Lowest AQI recorded in
May18AQI
202418AQI
Highest AQI recorded in
December29AQI
Lowest AQI recorded in
April10AQI
202318AQI
Highest AQI recorded in
November27AQI
Lowest AQI recorded in
April12AQI
202220AQI
Highest AQI recorded in
November30AQI
Lowest AQI recorded in
June12AQI
202120AQI
Highest AQI recorded in
August25AQI
Lowest AQI recorded in
February15AQI
202021AQI
Highest AQI recorded in
September59AQI
Lowest AQI recorded in
December13AQI
Most & Least Polluted Years Over the Last 6 Years
Crofton Substation's annual 2025 AQI (27) shows an average percentage change of 35.9% (worsened AQI) compared to previous years: 2020 (21), 2021 (20), 2022 (20), 2023 (18), 2024 (18).