Castlegar, British Columbia, Canada Historical Air Quality Analysis
Dive into detailed Air Quality Insights with historical data, monthly patterns, and yearly trends at your fingertips!
August Air Quality Analysis
Castlegar, British Columbia, Canada
AQI Trends: Highest and Lowest
Same Day Analysis (19th August ):
On this day, AQI across the 5 years varied significantly: 2025 ranks 4th highest AQI at 22 of Good air quality, showing improvement over 2024, 2023 and 2021 on the same day.
Download 2024 Annual Data
World Air Quality Report

Day & Night AQI Trend: 20th Aug - 21st Aug 2025
Castlegar, British Columbia, Canada
5 AM20th Aug 2025
8 PM
4 AM21st Aug 2025
33AQI
20AQI
25AQI
18AQI
In the last 24 hours,
Castlegar's AQI reached its highest point of 33 at 5 AM during the Day, while the lowest point, undefined, was recorded at 4 AM during the Night between 20th Aug and 21st Aug 2025.
Day & Night AQI Trend : Jul - Aug 2025
Castlegar, British Columbia, Canada
16°C7/21°C
17°C11/27°C
19°C7/30°C
19°C8/28°C
19°C6/26°C
21°C14/28°C
22°C11/30°C
21°C8/32°C
22°C11/34°C
22°C11/34°C
20°C12/29°C
20°C13/27°C
19°C7/30°C
21°C8/29°C
19°C8/28°C
14°C6/20°C
11°C4/20°C
15°C4/25°C
19°C6/29°C
21°C10/31°C
21°C8/30°C
23°C13/32°C
21°C10/30°C
19°C8/28°C
17°C12/20°C
18°C9/21°C
18°C8/24°C
16°C7/25°C
17°C6/27°C
19°C10/27°C
--°C/°C
31AQI
28AQI
33AQI
29AQI
2025 Days Vs Air Quality
Castlegar, British Columbia, Canada
100%
230
0.4%
1
Total number of days with different AQI categories in last 233 days in 2025 (132 days remaining)
Under WHO’s Safe Air Quality Limits: 100%
Health Risk Level:
Very Low
In 2025, 100% of 233 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
Castlegar, British Columbia, Canada
AQI levels in 2025
Jan.
Feb.
Mar.
Apr.
May
Jun.
Jul.
Aug.
Sep.
Oct.
Nov.
Dec.
44AQI
41AQI
30AQI
23AQI
29AQI
26AQI
28AQI
23AQI
22AQI
26AQI
26AQI
32AQI
38AQI
35AQI
36AQI
33AQI
29AQI
31AQI
32AQI
29AQI
36AQI
45AQI
41AQI
39AQI
24AQI
32AQI
34AQI
33AQI
44AQI
51AQI
48AQI
24AQI
27AQI
24AQI
19AQI
21AQI
25AQI
24AQI
36AQI
41AQI
37AQI
27AQI
30AQI
29AQI
27AQI
22AQI
42AQI
28AQI
31AQI
28AQI
31AQI
22AQI
22AQI
23AQI
22AQI
21AQI
25AQI
27AQI
36AQI
43AQI
36AQI
33AQI
33AQI
25AQI
24AQI
23AQI
28AQI
28AQI
20AQI
23AQI
19AQI
20AQI
19AQI
20AQI
18AQI
20AQI
19AQI
24AQI
17AQI
15AQI
16AQI
16AQI
18AQI
26AQI
22AQI
18AQI
18AQI
18AQI
27AQI
25AQI
17AQI
22AQI
23AQI
27AQI
32AQI
37AQI
30AQI
14AQI
12AQI
17AQI
25AQI
18AQI
16AQI
26AQI
22AQI
26AQI
18AQI
30AQI
25AQI
18AQI
15AQI
16AQI
22AQI
29AQI
37AQI
41AQI
39AQI
27AQI
20AQI
17AQI
21AQI
26AQI
39AQI
15AQI
17AQI
20AQI
27AQI
22AQI
23AQI
24AQI
23AQI
17AQI
16AQI
20AQI
20AQI
21AQI
17AQI
14AQI
14AQI
13AQI
13AQI
18AQI
24AQI
27AQI
33AQI
27AQI
16AQI
15AQI
17AQI
15AQI
16AQI
14AQI
13AQI
19AQI
23AQI
28AQI
27AQI
20AQI
22AQI
36AQI
34AQI
41AQI
41AQI
29AQI
23AQI
22AQI
24AQI
37AQI
31AQI
19AQI
25AQI
24AQI
24AQI
33AQI
46AQI
46AQI
28AQI
20AQI
12AQI
18AQI
27AQI
33AQI
36AQI
23AQI
20AQI
27AQI
27AQI
25AQI
26AQI
36AQI
19AQI
20AQI
42AQI
21AQI
26AQI
18AQI
27AQI
30AQI
29AQI
36AQI
27AQI
27AQI
33AQI
30AQI
36AQI
29AQI
19AQI
24AQI
25AQI
29AQI
29AQI
34AQI
46AQI
46AQI
41AQI
43AQI
34AQI
41AQI
25AQI
17AQI
23AQI
30AQI
24AQI
23AQI
35AQI
28AQI
35AQI
25AQI
16AQI
21AQI
22AQI
34AQI
28AQI
23AQI
24AQI
20AQI
27AQI
28AQI
30AQI
No. of days
202526AQI
Highest AQI recorded in
January34AQI
Lowest AQI recorded in
May20AQI
202430AQI
Highest AQI recorded in
July46AQI
Lowest AQI recorded in
May20AQI
202341AQI
Highest AQI recorded in
August76AQI
Lowest AQI recorded in
April24AQI
202234AQI
Highest AQI recorded in
September54AQI
Lowest AQI recorded in
May19AQI
202143AQI
Highest AQI recorded in
July108AQI
Lowest AQI recorded in
May22AQI
202035AQI
Highest AQI recorded in
September92AQI
Lowest AQI recorded in
June18AQI
Most & Least Polluted Years Over the Last 6 Years
Castlegar's annual 2025 AQI (26) shows an average percentage change of -26.4% (improved AQI) compared to previous years: 2020 (35), 2021 (43), 2022 (34), 2023 (41), 2024 (30).