Ube, Yamaguchi, 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
Ube, Yamaguchi, Japan
AQI Trends: Highest and Lowest
Same Day Analysis (23rd September ):
On this day, AQI across the 5 years varied significantly: 2025 ranks the most lowest AQI at 25 of Good air quality, showing improvement over 2024, 2023, 2022 and 2021 on the same day.
Download 2024 Annual Data
World Air Quality Report

Day & Night AQI Trend: 24th Sep - 25th Sep 2025
Ube, Yamaguchi, Japan
5 AM24th Sep 2025
6 PM
4 AM25th Sep 2025
AQI
AQI
37AQI
24AQI
In the last 24 hours,
Ube's AQI reached its highest point of 37 at 3 PM during the Night, while the lowest point, undefined, was recorded at 4 AM during the Night between 24th Sep and 25th Sep 2025.
Day & Night AQI Trend : Aug - Sep 2025
Ube, Yamaguchi, Japan
28°C25/32°C
27°C25/31°C
27°C25/31°C
28°C24/31°C
28°C25/31°C
27°C25/30°C
28°C26/31°C
27°C25/30°C
27°C24/30°C
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
--°C/°C
--°C/°C
35AQI
30AQI
34AQI
32AQI
2025 Days Vs Air Quality
Ube, Yamaguchi, Japan
73%
195
27%
71
Total number of days with different AQI categories in last 267 days in 2025 (98 days remaining)
Under WHO’s Safe Air Quality Limits: 73%
Health Risk Level:
Low
In 2025, 73% of 267 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
Ube, Yamaguchi, Japan
AQI levels in 2025
Jan.
Feb.
Mar.
Apr.
May
Jun.
Jul.
Aug.
Sep.
Oct.
Nov.
Dec.
29AQI
36AQI
31AQI
31AQI
29AQI
48AQI
29AQI
37AQI
29AQI
29AQI
30AQI
31AQI
39AQI
46AQI
37AQI
37AQI
45AQI
36AQI
46AQI
48AQI
59AQI
72AQI
74AQI
70AQI
44AQI
42AQI
38AQI
35AQI
32AQI
39AQI
48AQI
48AQI
35AQI
49AQI
32AQI
40AQI
30AQI
39AQI
30AQI
33AQI
32AQI
41AQI
39AQI
33AQI
43AQI
31AQI
47AQI
39AQI
36AQI
34AQI
32AQI
35AQI
38AQI
39AQI
39AQI
38AQI
55AQI
67AQI
66AQI
72AQI
63AQI
46AQI
37AQI
33AQI
35AQI
33AQI
37AQI
40AQI
43AQI
47AQI
55AQI
53AQI
43AQI
35AQI
28AQI
40AQI
42AQI
43AQI
53AQI
57AQI
71AQI
71AQI
63AQI
71AQI
74AQI
62AQI
61AQI
51AQI
42AQI
41AQI
43AQI
37AQI
29AQI
36AQI
42AQI
46AQI
46AQI
47AQI
58AQI
58AQI
58AQI
57AQI
53AQI
49AQI
37AQI
54AQI
50AQI
57AQI
58AQI
45AQI
42AQI
43AQI
26AQI
40AQI
60AQI
54AQI
59AQI
51AQI
50AQI
54AQI
52AQI
47AQI
48AQI
41AQI
43AQI
35AQI
35AQI
39AQI
36AQI
37AQI
48AQI
52AQI
58AQI
61AQI
56AQI
54AQI
43AQI
52AQI
58AQI
58AQI
39AQI
40AQI
44AQI
31AQI
31AQI
31AQI
40AQI
44AQI
40AQI
41AQI
37AQI
47AQI
51AQI
32AQI
47AQI
44AQI
54AQI
58AQI
62AQI
55AQI
35AQI
45AQI
48AQI
44AQI
40AQI
36AQI
36AQI
36AQI
42AQI
43AQI
51AQI
57AQI
72AQI
52AQI
49AQI
46AQI
53AQI
50AQI
44AQI
45AQI
53AQI
60AQI
71AQI
68AQI
71AQI
64AQI
55AQI
55AQI
61AQI
70AQI
74AQI
63AQI
54AQI
47AQI
43AQI
51AQI
57AQI
46AQI
41AQI
40AQI
36AQI
33AQI
31AQI
29AQI
29AQI
26AQI
25AQI
25AQI
25AQI
24AQI
25AQI
29AQI
45AQI
44AQI
45AQI
44AQI
43AQI
44AQI
51AQI
47AQI
40AQI
35AQI
31AQI
34AQI
40AQI
45AQI
42AQI
41AQI
38AQI
46AQI
51AQI
48AQI
40AQI
44AQI
45AQI
42AQI
41AQI
39AQI
45AQI
47AQI
50AQI
51AQI
49AQI
41AQI
35AQI
39AQI
26AQI
24AQI
28AQI
34AQI
33AQI
28AQI
32AQI
32AQI
30AQI
32AQI
29AQI
32AQI
34AQI
30AQI
24AQI
25AQI
30AQI
21AQI
23AQI
25AQI
41AQI
40AQI
50AQI
48AQI
44AQI
48AQI
46AQI
43AQI
30AQI
No. of days
202544AQI
Highest AQI recorded in
March50AQI
Lowest AQI recorded in
September30AQI
202438AQI
Highest AQI recorded in
April51AQI
Lowest AQI recorded in
July30AQI
202342AQI
Highest AQI recorded in
April52AQI
Lowest AQI recorded in
August31AQI
202241AQI
Highest AQI recorded in
August53AQI
Lowest AQI recorded in
September35AQI
202139AQI
Highest AQI recorded in
May47AQI
Lowest AQI recorded in
August30AQI
202037AQI
Highest AQI recorded in
August47AQI
Lowest AQI recorded in
September30AQI
Most & Least Polluted Years Over the Last 6 Years
Ube's annual 2025 AQI (44) shows an average percentage change of 11.6% (worsened AQI) compared to previous years: 2020 (37), 2021 (39), 2022 (41), 2023 (42), 2024 (38).