Asahikawa, Hokkaido, Japan 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
Asahikawa, Hokkaido, Japan
AQI Trends: Highest and Lowest
Same Day Analysis (23rd August ):
On this day, AQI across the 5 years varied significantly: 2025 ranks 2nd highest AQI at 40 of Good air quality, showing improvement over 2023 on the same day.
Download 2024 Annual Data
World Air Quality Report

Day & Night AQI Trend: 24th Aug - 25th Aug 2025
Asahikawa, Hokkaido, Japan
4 AM24th Aug 2025
6 PM
3 AM25th Aug 2025
AQI
AQI
42AQI
19AQI
In the last 24 hours,
Asahikawa's AQI reached its highest point of 42 at 8 PM during the Night, while the lowest point, 19, was recorded at 2 PM during the Night between 24th Aug and 25th Aug 2025.
Day & Night AQI Trend : Jul - Aug 2025
Asahikawa, Hokkaido, Japan
21°C19/23°C
21°C20/24°C
21°C19/23°C
23°C20/27°C
24°C20/30°C
24°C20/30°C
25°C20/31°C
24°C20/29°C
24°C20/30°C
24°C19/31°C
22°C20/26°C
22°C19/27°C
20°C18/23°C
19°C15/23°C
19°C16/23°C
21°C16/27°C
21°C17/27°C
21°C16/28°C
21°C16/28°C
22°C18/29°C
21°C16/26°C
22°C15/29°C
20°C18/22°C
20°C15/26°C
18°C15/21°C
22°C18/27°C
20°C16/24°C
20°C15/26°C
20°C16/26°C
--°C/°C
--°C/°C
37AQI
31AQI
38AQI
35AQI
2025 Days Vs Air Quality
Asahikawa, Hokkaido, Japan
94%
221
6%
14
Total number of days with different AQI categories in last 236 days in 2025 (129 days remaining)
Under WHO’s Safe Air Quality Limits: 94%
Health Risk Level:
Very Low
In 2025, 94% of 236 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
Asahikawa, Hokkaido, Japan
AQI levels in 2025
Jan.
Feb.
Mar.
Apr.
May
Jun.
Jul.
Aug.
Sep.
Oct.
Nov.
Dec.
57AQI
49AQI
41AQI
38AQI
37AQI
44AQI
40AQI
36AQI
33AQI
30AQI
35AQI
31AQI
46AQI
42AQI
49AQI
46AQI
46AQI
53AQI
47AQI
54AQI
52AQI
64AQI
70AQI
62AQI
38AQI
35AQI
34AQI
35AQI
39AQI
30AQI
39AQI
34AQI
43AQI
51AQI
31AQI
35AQI
30AQI
37AQI
36AQI
34AQI
29AQI
28AQI
36AQI
44AQI
35AQI
51AQI
60AQI
39AQI
39AQI
31AQI
34AQI
33AQI
32AQI
31AQI
31AQI
31AQI
37AQI
31AQI
51AQI
41AQI
41AQI
33AQI
33AQI
33AQI
30AQI
32AQI
29AQI
33AQI
39AQI
41AQI
60AQI
37AQI
31AQI
26AQI
28AQI
21AQI
26AQI
26AQI
42AQI
37AQI
35AQI
29AQI
31AQI
41AQI
32AQI
34AQI
31AQI
28AQI
28AQI
28AQI
36AQI
32AQI
28AQI
27AQI
34AQI
38AQI
31AQI
32AQI
35AQI
44AQI
47AQI
44AQI
34AQI
31AQI
27AQI
20AQI
26AQI
25AQI
23AQI
23AQI
26AQI
23AQI
25AQI
28AQI
26AQI
34AQI
21AQI
23AQI
17AQI
20AQI
22AQI
24AQI
31AQI
33AQI
32AQI
32AQI
32AQI
39AQI
37AQI
32AQI
32AQI
34AQI
36AQI
49AQI
46AQI
53AQI
48AQI
35AQI
48AQI
41AQI
46AQI
40AQI
36AQI
33AQI
26AQI
25AQI
25AQI
33AQI
40AQI
45AQI
40AQI
28AQI
35AQI
34AQI
27AQI
25AQI
32AQI
43AQI
42AQI
39AQI
50AQI
49AQI
36AQI
35AQI
36AQI
35AQI
36AQI
33AQI
37AQI
40AQI
43AQI
45AQI
52AQI
46AQI
46AQI
48AQI
44AQI
39AQI
42AQI
44AQI
45AQI
46AQI
46AQI
45AQI
48AQI
45AQI
47AQI
50AQI
47AQI
45AQI
44AQI
44AQI
48AQI
46AQI
46AQI
42AQI
41AQI
46AQI
41AQI
36AQI
37AQI
39AQI
41AQI
39AQI
42AQI
43AQI
39AQI
37AQI
39AQI
39AQI
36AQI
36AQI
36AQI
35AQI
34AQI
33AQI
37AQI
36AQI
35AQI
27AQI
26AQI
29AQI
31AQI
30AQI
30AQI
30AQI
35AQI
40AQI
35AQI
36AQI
37AQI
41AQI
37AQI
36AQI
40AQI
44AQI
37AQI
33AQI
29AQI
36AQI
40AQI
43AQI
34AQI
No. of days
202537AQI
Highest AQI recorded in
January44AQI
Lowest AQI recorded in
April29AQI
202433AQI
Highest AQI recorded in
January42AQI
Lowest AQI recorded in
September21AQI
202333AQI
Highest AQI recorded in
March47AQI
Lowest AQI recorded in
August24AQI
202230AQI
Highest AQI recorded in
February34AQI
Lowest AQI recorded in
August20AQI
202129AQI
Highest AQI recorded in
January39AQI
Lowest AQI recorded in
November20AQI
202027AQI
Highest AQI recorded in
December31AQI
Lowest AQI recorded in
November23AQI
Most & Least Polluted Years Over the Last 6 Years
Asahikawa's annual 2025 AQI (37) shows an average percentage change of 22.8% (worsened AQI) compared to previous years: 2020 (27), 2021 (29), 2022 (30), 2023 (33), 2024 (33).