Kotoshibacho, Ube, Yamaguchi, Japan 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
Kotoshibacho, Ube, Yamaguchi, Japan
AQI Trends: Highest and Lowest
Same Day Analysis (3rd October ):
On this day, AQI across the 5 years varied significantly: 2025 ranks 2nd highest AQI at 53 of Moderate air quality, showing improvement over 2021 on the same day.
Download 2024 Annual Data
World Air Quality Report

Day & Night AQI Trend: 3rd Oct - 4th Oct 2025
Kotoshibacho, Ube, Yamaguchi, Japan
6 AM3rd Oct 2025
6 PM
5 AM4th Oct 2025
55AQI
45AQI
65AQI
46AQI
In the last 24 hours,
Kotoshibacho's AQI reached its highest point of 65 at 2 AM during the Night, while the lowest point, 45, was recorded at 9 AM during the Day between 3rd Oct and 4th Oct 2025.
Day & Night AQI Trend : Sep - Oct 2025
Kotoshibacho, Ube, Yamaguchi, Japan
26°C25/28°C
28°C25/31°C
28°C24/32°C
28°C26/32°C
28°C26/32°C
27°C25/31°C
25°C24/27°C
26°C23/29°C
26°C24/28°C
26°C25/29°C
27°C25/30°C
27°C25/30°C
27°C24/31°C
27°C25/31°C
25°C23/27°C
24°C21/27°C
25°C23/27°C
24°C22/27°C
23°C20/27°C
23°C22/25°C
25°C24/27°C
25°C24/27°C
25°C22/28°C
23°C21/26°C
23°C21/26°C
24°C20/26°C
22°C19/25°C
22°C19/26°C
22°C19/26°C
21°C19/21°C
--°C/°C
33AQI
30AQI
33AQI
30AQI
2025 Days Vs Air Quality
Kotoshibacho, Ube, Yamaguchi, Japan
74%
205
26%
71
Total number of days with different AQI categories in last 277 days in 2025 (88 days remaining)
Under WHO’s Safe Air Quality Limits: 74%
Health Risk Level:
Low
In 2025, 74% of 277 days were within WHO’s safe air quality limits. The risk of health issues is Low, but the long-term effects, especially on vulnerable individuals, remain uncertain.
Annual Air Quality Insights
Kotoshibacho, Ube, Yamaguchi, Japan
AQI levels in 2025
Jan.
Feb.
Mar.
Apr.
May
Jun.
Jul.
Aug.
Sep.
Oct.
Nov.
Dec.
29AQI
37AQI
31AQI
31AQI
29AQI
49AQI
29AQI
37AQI
28AQI
29AQI
31AQI
31AQI
40AQI
47AQI
38AQI
38AQI
46AQI
34AQI
46AQI
49AQI
59AQI
71AQI
74AQI
70AQI
45AQI
43AQI
38AQI
36AQI
31AQI
39AQI
47AQI
47AQI
35AQI
48AQI
31AQI
38AQI
30AQI
38AQI
30AQI
32AQI
31AQI
40AQI
39AQI
32AQI
43AQI
31AQI
47AQI
39AQI
36AQI
34AQI
32AQI
34AQI
36AQI
37AQI
38AQI
38AQI
54AQI
69AQI
65AQI
70AQI
60AQI
46AQI
36AQI
33AQI
35AQI
33AQI
36AQI
41AQI
41AQI
46AQI
53AQI
51AQI
42AQI
34AQI
26AQI
39AQI
41AQI
43AQI
52AQI
58AQI
70AQI
70AQI
62AQI
70AQI
73AQI
60AQI
61AQI
50AQI
40AQI
40AQI
41AQI
36AQI
28AQI
35AQI
40AQI
45AQI
44AQI
46AQI
57AQI
56AQI
57AQI
56AQI
51AQI
48AQI
36AQI
54AQI
49AQI
57AQI
57AQI
44AQI
41AQI
41AQI
25AQI
39AQI
59AQI
53AQI
57AQI
50AQI
50AQI
53AQI
51AQI
48AQI
47AQI
40AQI
42AQI
34AQI
35AQI
37AQI
34AQI
36AQI
47AQI
52AQI
57AQI
60AQI
55AQI
54AQI
42AQI
51AQI
57AQI
58AQI
38AQI
40AQI
43AQI
32AQI
30AQI
30AQI
38AQI
43AQI
40AQI
41AQI
37AQI
47AQI
51AQI
32AQI
46AQI
44AQI
53AQI
57AQI
61AQI
54AQI
37AQI
44AQI
47AQI
42AQI
39AQI
35AQI
35AQI
35AQI
40AQI
41AQI
47AQI
53AQI
64AQI
54AQI
51AQI
49AQI
52AQI
52AQI
47AQI
48AQI
53AQI
58AQI
65AQI
70AQI
70AQI
66AQI
59AQI
58AQI
61AQI
68AQI
72AQI
64AQI
58AQI
51AQI
46AQI
52AQI
55AQI
49AQI
45AQI
44AQI
41AQI
37AQI
34AQI
31AQI
31AQI
28AQI
26AQI
26AQI
25AQI
25AQI
25AQI
29AQI
43AQI
43AQI
43AQI
45AQI
44AQI
43AQI
49AQI
48AQI
41AQI
37AQI
31AQI
34AQI
39AQI
44AQI
44AQI
41AQI
38AQI
43AQI
51AQI
49AQI
40AQI
44AQI
45AQI
42AQI
41AQI
40AQI
45AQI
46AQI
50AQI
51AQI
48AQI
41AQI
35AQI
38AQI
25AQI
23AQI
28AQI
33AQI
33AQI
28AQI
32AQI
31AQI
29AQI
32AQI
28AQI
32AQI
36AQI
30AQI
24AQI
25AQI
29AQI
21AQI
23AQI
25AQI
28AQI
26AQI
29AQI
27AQI
31AQI
28AQI
37AQI
47AQI
48AQI
53AQI
41AQI
39AQI
49AQI
47AQI
44AQI
47AQI
47AQI
43AQI
30AQI
49AQI
No. of days
202543AQI
Highest AQI recorded in
October49AQI
Lowest AQI recorded in
September30AQI
202437AQI
Highest AQI recorded in
April51AQI
Lowest AQI recorded in
July29AQI
202341AQI
Highest AQI recorded in
April53AQI
Lowest AQI recorded in
August29AQI
202242AQI
Highest AQI recorded in
March53AQI
Lowest AQI recorded in
September35AQI
202139AQI
Highest AQI recorded in
May46AQI
Lowest AQI recorded in
August31AQI
202037AQI
Highest AQI recorded in
August45AQI
Lowest AQI recorded in
September30AQI
Most & Least Polluted Years Over the Last 6 Years
Kotoshibacho's annual 2025 AQI (43) shows an average percentage change of 9.9% (worsened AQI) compared to previous years: 2020 (37), 2021 (39), 2022 (42), 2023 (41), 2024 (37).