Inzai, 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
Inzai, Chiba, Japan
AQI Trends: Highest and Lowest
Same Day Analysis (18th September ):
On this day, AQI across the 5 years varied significantly: 2025 ranks 1st highest AQI at 45 of Good air quality on the same day.
Download 2024 Annual Data
World Air Quality Report

Day & Night AQI Trend: 18th Sep - 19th Sep 2025
Inzai, Chiba, Japan
5 AM18th Sep 2025
6 PM
4 AM19th Sep 2025
74AQI
34AQI
44AQI
18AQI
In the last 24 hours,
Inzai's AQI reached its highest point of 74 at 1 PM during the Day, while the lowest point, 18, was recorded at 6 PM during the Night between 18th Sep and 19th Sep 2025.
Day & Night AQI Trend : Aug - Sep 2025
Inzai, Chiba, Japan
30°C27/34°C
31°C27/37°C
31°C28/36°C
30°C27/34°C
31°C27/37°C
31°C27/36°C
30°C27/34°C
30°C27/33°C
29°C25/33°C
29°C25/33°C
31°C27/38°C
32°C29/37°C
30°C27/33°C
30°C27/33°C
30°C28/36°C
26°C25/28°C
25°C24/26°C
27°C23/32°C
28°C25/31°C
29°C25/35°C
29°C26/33°C
28°C26/30°C
26°C23/30°C
25°C23/28°C
26°C23/29°C
29°C27/32°C
28°C25/32°C
29°C26/32°C
29°C26/33°C
29°C23/35°C
--°C/°C
42AQI
39AQI
40AQI
37AQI
2025 Days Vs Air Quality
Inzai, Chiba, Japan
90%
234
10%
27
Total number of days with different AQI categories in last 262 days in 2025 (103 days remaining)
Under WHO’s Safe Air Quality Limits: 90%
Health Risk Level:
Very Low
In 2025, 90% of 262 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
Inzai, Chiba, Japan
AQI levels in 2025
Jan.
Feb.
Mar.
Apr.
May
Jun.
Jul.
Aug.
Sep.
Oct.
Nov.
Dec.
33AQI
31AQI
25AQI
28AQI
34AQI
52AQI
33AQI
35AQI
29AQI
30AQI
30AQI
33AQI
30AQI
39AQI
36AQI
34AQI
31AQI
38AQI
56AQI
41AQI
44AQI
41AQI
52AQI
43AQI
41AQI
37AQI
36AQI
38AQI
31AQI
34AQI
30AQI
41AQI
32AQI
41AQI
31AQI
35AQI
29AQI
30AQI
30AQI
30AQI
31AQI
33AQI
34AQI
49AQI
32AQI
49AQI
41AQI
41AQI
33AQI
32AQI
31AQI
32AQI
32AQI
32AQI
34AQI
35AQI
37AQI
40AQI
55AQI
49AQI
61AQI
40AQI
41AQI
27AQI
32AQI
32AQI
35AQI
33AQI
35AQI
35AQI
40AQI
40AQI
37AQI
38AQI
25AQI
22AQI
22AQI
18AQI
23AQI
40AQI
49AQI
53AQI
52AQI
66AQI
79AQI
71AQI
48AQI
40AQI
39AQI
33AQI
28AQI
22AQI
20AQI
21AQI
24AQI
24AQI
31AQI
38AQI
26AQI
47AQI
40AQI
38AQI
29AQI
40AQI
30AQI
33AQI
46AQI
52AQI
64AQI
51AQI
46AQI
45AQI
30AQI
39AQI
42AQI
48AQI
50AQI
44AQI
34AQI
45AQI
40AQI
29AQI
30AQI
37AQI
33AQI
29AQI
23AQI
28AQI
30AQI
23AQI
29AQI
24AQI
35AQI
30AQI
37AQI
42AQI
28AQI
47AQI
41AQI
65AQI
45AQI
46AQI
43AQI
41AQI
30AQI
29AQI
25AQI
25AQI
28AQI
25AQI
18AQI
22AQI
29AQI
32AQI
34AQI
42AQI
46AQI
50AQI
59AQI
46AQI
36AQI
32AQI
41AQI
37AQI
36AQI
42AQI
39AQI
50AQI
43AQI
42AQI
37AQI
31AQI
20AQI
24AQI
25AQI
21AQI
23AQI
33AQI
30AQI
37AQI
40AQI
40AQI
46AQI
42AQI
46AQI
53AQI
71AQI
77AQI
77AQI
75AQI
57AQI
47AQI
48AQI
45AQI
38AQI
36AQI
37AQI
39AQI
35AQI
32AQI
30AQI
34AQI
34AQI
37AQI
38AQI
33AQI
33AQI
31AQI
36AQI
32AQI
31AQI
30AQI
33AQI
40AQI
44AQI
60AQI
49AQI
50AQI
48AQI
45AQI
43AQI
36AQI
38AQI
35AQI
32AQI
32AQI
33AQI
34AQI
38AQI
42AQI
44AQI
47AQI
48AQI
47AQI
47AQI
53AQI
54AQI
52AQI
49AQI
44AQI
50AQI
53AQI
52AQI
42AQI
36AQI
35AQI
30AQI
29AQI
28AQI
29AQI
37AQI
39AQI
35AQI
30AQI
31AQI
26AQI
33AQI
35AQI
34AQI
47AQI
45AQI
36AQI
36AQI
40AQI
38AQI
33AQI
36AQI
43AQI
44AQI
35AQI
No. of days
202538AQI
Highest AQI recorded in
August44AQI
Lowest AQI recorded in
May33AQI
202437AQI
Highest AQI recorded in
July51AQI
Lowest AQI recorded in
August30AQI
202339AQI
Highest AQI recorded in
April46AQI
Lowest AQI recorded in
August27AQI
202238AQI
Highest AQI recorded in
June42AQI
Lowest AQI recorded in
August21AQI
202134AQI
Highest AQI recorded in
December42AQI
Lowest AQI recorded in
August28AQI
202034AQI
Highest AQI recorded in
November40AQI
Lowest AQI recorded in
September25AQI
Most & Least Polluted Years Over the Last 6 Years
Inzai's annual 2025 AQI (38) shows an average percentage change of 4.7% (worsened AQI) compared to previous years: 2020 (34), 2021 (34), 2022 (38), 2023 (39), 2024 (37).