Ozone, Kisarazu, Chiba, 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
Ozone, Kisarazu, Chiba, Japan
AQI Trends: Highest and Lowest
Same Day Analysis (26th September ):
On this day, AQI across the 5 years varied significantly: 2025 ranks the most lowest AQI at 22 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: 26th Sep - 27th Sep 2025
Ozone, Kisarazu, Chiba, Japan
5 AM26th Sep 2025
5 PM
4 AM27th Sep 2025
64AQI
11AQI
61AQI
30AQI
In the last 24 hours,
Ozone's AQI reached its highest point of 64 at 12 PM during the Day, while the lowest point, 11, was recorded at 7 AM during the Day between 26th Sep and 27th Sep 2025.
Day & Night AQI Trend : Aug - Sep 2025
Ozone, Kisarazu, Chiba, Japan
27°C25/30°C
27°C25/29°C
28°C26/32°C
29°C27/32°C
28°C26/30°C
28°C27/30°C
28°C27/30°C
26°C25/26°C
25°C22/27°C
25°C23/29°C
26°C24/29°C
27°C26/30°C
28°C26/30°C
28°C27/30°C
27°C24/29°C
25°C24/27°C
26°C24/28°C
27°C27/29°C
27°C25/29°C
27°C25/29°C
27°C26/29°C
27°C23/30°C
22°C20/23°C
24°C22/26°C
26°C22/29°C
23°C20/25°C
22°C19/25°C
22°C20/25°C
23°C21/26°C
25°C23/28°C
--°C/°C
37AQI
35AQI
37AQI
34AQI
2025 Days Vs Air Quality
Ozone, Kisarazu, Chiba, Japan
90%
241
10%
28
Total number of days with different AQI categories in last 270 days in 2025 (95 days remaining)
Under WHO’s Safe Air Quality Limits: 90%
Health Risk Level:
Very Low
In 2025, 90% of 270 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
Ozone, Kisarazu, Chiba, Japan
AQI levels in 2025
Jan.
Feb.
Mar.
Apr.
May
Jun.
Jul.
Aug.
Sep.
Oct.
Nov.
Dec.
31AQI
32AQI
27AQI
32AQI
34AQI
58AQI
33AQI
38AQI
33AQI
29AQI
28AQI
36AQI
31AQI
38AQI
38AQI
30AQI
32AQI
29AQI
55AQI
44AQI
45AQI
40AQI
49AQI
50AQI
39AQI
39AQI
36AQI
38AQI
33AQI
33AQI
30AQI
39AQI
32AQI
46AQI
32AQI
36AQI
30AQI
34AQI
31AQI
31AQI
31AQI
33AQI
34AQI
31AQI
29AQI
30AQI
37AQI
37AQI
31AQI
31AQI
31AQI
31AQI
34AQI
32AQI
36AQI
36AQI
36AQI
40AQI
49AQI
50AQI
64AQI
42AQI
39AQI
29AQI
34AQI
32AQI
35AQI
33AQI
35AQI
39AQI
55AQI
44AQI
42AQI
36AQI
28AQI
23AQI
24AQI
18AQI
25AQI
40AQI
47AQI
55AQI
54AQI
64AQI
82AQI
68AQI
48AQI
35AQI
42AQI
31AQI
30AQI
23AQI
21AQI
23AQI
23AQI
22AQI
29AQI
34AQI
26AQI
43AQI
37AQI
37AQI
24AQI
39AQI
29AQI
33AQI
44AQI
48AQI
57AQI
41AQI
40AQI
36AQI
27AQI
36AQI
33AQI
40AQI
43AQI
36AQI
32AQI
40AQI
36AQI
26AQI
29AQI
36AQI
32AQI
26AQI
23AQI
24AQI
27AQI
23AQI
27AQI
29AQI
33AQI
31AQI
33AQI
34AQI
24AQI
40AQI
38AQI
56AQI
36AQI
33AQI
35AQI
33AQI
27AQI
24AQI
23AQI
22AQI
24AQI
21AQI
16AQI
18AQI
23AQI
25AQI
29AQI
34AQI
41AQI
42AQI
47AQI
34AQI
25AQI
21AQI
31AQI
28AQI
27AQI
31AQI
32AQI
42AQI
38AQI
37AQI
33AQI
28AQI
19AQI
20AQI
19AQI
18AQI
17AQI
26AQI
28AQI
28AQI
32AQI
32AQI
35AQI
40AQI
39AQI
45AQI
59AQI
69AQI
73AQI
72AQI
59AQI
53AQI
55AQI
53AQI
45AQI
43AQI
41AQI
42AQI
38AQI
31AQI
30AQI
29AQI
28AQI
28AQI
29AQI
24AQI
24AQI
22AQI
25AQI
27AQI
26AQI
28AQI
33AQI
40AQI
44AQI
63AQI
51AQI
51AQI
49AQI
45AQI
46AQI
38AQI
37AQI
36AQI
33AQI
35AQI
36AQI
37AQI
40AQI
42AQI
45AQI
47AQI
49AQI
49AQI
47AQI
55AQI
55AQI
53AQI
50AQI
46AQI
51AQI
55AQI
54AQI
42AQI
37AQI
36AQI
41AQI
34AQI
29AQI
29AQI
38AQI
42AQI
36AQI
30AQI
31AQI
29AQI
36AQI
33AQI
32AQI
48AQI
47AQI
33AQI
32AQI
29AQI
26AQI
26AQI
26AQI
28AQI
22AQI
37AQI
34AQI
42AQI
34AQI
30AQI
29AQI
40AQI
46AQI
34AQI
No. of days
202536AQI
Highest AQI recorded in
August46AQI
Lowest AQI recorded in
June29AQI
202435AQI
Highest AQI recorded in
July46AQI
Lowest AQI recorded in
August26AQI
202336AQI
Highest AQI recorded in
April43AQI
Lowest AQI recorded in
August22AQI
202233AQI
Highest AQI recorded in
March40AQI
Lowest AQI recorded in
August17AQI
202132AQI
Highest AQI recorded in
January40AQI
Lowest AQI recorded in
September27AQI
202030AQI
Highest AQI recorded in
August36AQI
Lowest AQI recorded in
September22AQI
Most & Least Polluted Years Over the Last 6 Years
Ozone's annual 2025 AQI (36) shows an average percentage change of 8.9% (worsened AQI) compared to previous years: 2020 (30), 2021 (32), 2022 (33), 2023 (36), 2024 (35).