Hayashima, Okayama, Japan 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
Hayashima, Okayama, Japan
AQI Trends: Highest and Lowest
Same Day Analysis (21st September ):
On this day, AQI across the 5 years varied significantly: 2025 ranks 4th highest AQI at 27 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: 22nd Sep - 23rd Sep 2025
Hayashima, Okayama, Japan
5 AM22nd Sep 2025
6 PM
4 AM23rd Sep 2025
AQI
AQI
35AQI
17AQI
In the last 24 hours,
Hayashima's AQI reached its highest point of 35 at 10 PM during the Night, while the lowest point, undefined, was recorded at 4 AM during the Night between 22nd Sep and 23rd Sep 2025.
Day & Night AQI Trend : Aug - Sep 2025
Hayashima, Okayama, Japan
29°C27/32°C
29°C26/32°C
28°C26/31°C
28°C25/31°C
28°C25/31°C
28°C26/32°C
29°C26/32°C
29°C26/32°C
29°C26/33°C
29°C26/32°C
28°C25/32°C
25°C24/26°C
27°C25/32°C
27°C24/31°C
28°C26/31°C
28°C25/31°C
28°C25/31°C
26°C24/29°C
26°C23/29°C
26°C23/30°C
27°C24/29°C
27°C26/30°C
28°C25/31°C
28°C26/31°C
28°C26/30°C
26°C22/28°C
24°C21/27°C
25°C23/28°C
24°C20/28°C
--°C/°C
--°C/°C
42AQI
35AQI
40AQI
38AQI
2025 Days Vs Air Quality
Hayashima, Okayama, Japan
59%
157
39%
104
1%
3
Total number of days with different AQI categories in last 265 days in 2025 (100 days remaining)
Under WHO’s Safe Air Quality Limits: 59%
Health Risk Level:
Considerable
In 2025, 59% of 265 days were within WHO’s safe air quality limits, and 41% exceeded them. The risk of health issues is Considerable, with potential for conditions in sensitive individuals.
Annual Air Quality Insights
Hayashima, Okayama, Japan
AQI levels in 2025
Jan.
Feb.
Mar.
Apr.
May
Jun.
Jul.
Aug.
Sep.
Oct.
Nov.
Dec.
35AQI
42AQI
35AQI
36AQI
39AQI
54AQI
37AQI
39AQI
32AQI
31AQI
32AQI
35AQI
37AQI
49AQI
42AQI
42AQI
35AQI
38AQI
46AQI
53AQI
50AQI
69AQI
88AQI
77AQI
50AQI
46AQI
42AQI
42AQI
35AQI
47AQI
65AQI
74AQI
51AQI
59AQI
43AQI
42AQI
34AQI
41AQI
33AQI
34AQI
34AQI
36AQI
43AQI
32AQI
47AQI
31AQI
58AQI
42AQI
42AQI
37AQI
38AQI
34AQI
36AQI
34AQI
37AQI
43AQI
42AQI
70AQI
82AQI
111AQI
109AQI
63AQI
51AQI
39AQI
41AQI
38AQI
47AQI
46AQI
46AQI
47AQI
60AQI
57AQI
51AQI
42AQI
29AQI
42AQI
36AQI
41AQI
52AQI
61AQI
69AQI
75AQI
79AQI
79AQI
89AQI
84AQI
59AQI
54AQI
44AQI
45AQI
42AQI
44AQI
29AQI
44AQI
42AQI
54AQI
53AQI
56AQI
69AQI
67AQI
70AQI
57AQI
50AQI
53AQI
36AQI
54AQI
57AQI
66AQI
70AQI
63AQI
48AQI
53AQI
58AQI
45AQI
73AQI
68AQI
67AQI
58AQI
53AQI
65AQI
58AQI
44AQI
54AQI
45AQI
48AQI
35AQI
41AQI
33AQI
41AQI
38AQI
44AQI
55AQI
60AQI
66AQI
62AQI
58AQI
49AQI
54AQI
61AQI
68AQI
56AQI
41AQI
52AQI
42AQI
29AQI
35AQI
40AQI
45AQI
48AQI
45AQI
44AQI
51AQI
70AQI
39AQI
55AQI
52AQI
66AQI
65AQI
73AQI
54AQI
39AQI
51AQI
67AQI
61AQI
42AQI
40AQI
49AQI
45AQI
53AQI
56AQI
59AQI
57AQI
58AQI
52AQI
46AQI
44AQI
49AQI
58AQI
62AQI
60AQI
63AQI
62AQI
88AQI
90AQI
105AQI
90AQI
74AQI
74AQI
72AQI
83AQI
72AQI
61AQI
55AQI
51AQI
45AQI
50AQI
58AQI
41AQI
41AQI
36AQI
34AQI
35AQI
43AQI
36AQI
35AQI
27AQI
26AQI
25AQI
26AQI
35AQI
41AQI
46AQI
46AQI
45AQI
46AQI
59AQI
50AQI
52AQI
48AQI
50AQI
48AQI
47AQI
35AQI
35AQI
41AQI
47AQI
44AQI
44AQI
41AQI
47AQI
46AQI
47AQI
44AQI
43AQI
48AQI
53AQI
54AQI
55AQI
53AQI
51AQI
54AQI
55AQI
54AQI
42AQI
35AQI
43AQI
27AQI
24AQI
29AQI
34AQI
37AQI
36AQI
37AQI
32AQI
31AQI
32AQI
35AQI
40AQI
43AQI
46AQI
29AQI
30AQI
42AQI
27AQI
45AQI
44AQI
58AQI
55AQI
48AQI
55AQI
53AQI
48AQI
35AQI
No. of days
202550AQI
Highest AQI recorded in
March58AQI
Lowest AQI recorded in
September35AQI
202443AQI
Highest AQI recorded in
April56AQI
Lowest AQI recorded in
October35AQI
202348AQI
Highest AQI recorded in
March58AQI
Lowest AQI recorded in
August37AQI
202246AQI
Highest AQI recorded in
March57AQI
Lowest AQI recorded in
September34AQI
202143AQI
Highest AQI recorded in
May52AQI
Lowest AQI recorded in
August36AQI
202047AQI
Highest AQI recorded in
August62AQI
Lowest AQI recorded in
September32AQI
Most & Least Polluted Years Over the Last 6 Years
Hayashima's annual 2025 AQI (50) shows an average percentage change of 8.6% (worsened AQI) compared to previous years: 2020 (47), 2021 (43), 2022 (46), 2023 (48), 2024 (43).