Chiba, 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
Chiba, Chiba, Japan
AQI Trends: Highest and Lowest
Same Day Analysis (5th September ):
On this day, AQI across the 5 years varied significantly: 2025 ranks 2nd highest AQI at 35 of Good air quality, showing improvement over 2022 on the same day.
Download 2024 Annual Data
World Air Quality Report

Day & Night AQI Trend: 6th Sep - 7th Sep 2025
Chiba, Chiba, Japan
5 AM6th Sep 2025
6 PM
4 AM7th Sep 2025
AQI
AQI
41AQI
18AQI
In the last 24 hours,
Chiba's AQI reached its highest point of 41 at 5 PM during the Night, while the lowest point, 18, was recorded at 9 AM during the Night between 6th Sep and 7th Sep 2025.
Day & Night AQI Trend : Aug - Sep 2025
Chiba, Chiba, Japan
28°C24/33°C
28°C24/32°C
27°C25/27°C
27°C26/28°C
28°C26/29°C
27°C25/31°C
27°C24/31°C
28°C25/32°C
28°C26/32°C
28°C26/32°C
29°C26/35°C
29°C26/33°C
29°C26/33°C
30°C26/35°C
30°C27/34°C
30°C27/33°C
30°C27/35°C
30°C27/34°C
30°C27/33°C
29°C27/33°C
28°C25/32°C
29°C25/33°C
30°C27/35°C
31°C28/35°C
30°C27/33°C
30°C27/33°C
30°C28/34°C
26°C25/28°C
25°C23/27°C
--°C/°C
--°C/°C
46AQI
41AQI
44AQI
44AQI
2025 Days Vs Air Quality
Chiba, Chiba, Japan
85%
212
15%
36
Total number of days with different AQI categories in last 249 days in 2025 (116 days remaining)
Under WHO’s Safe Air Quality Limits: 85%
Health Risk Level:
Low
In 2025, 85% of 249 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
Chiba, Chiba, Japan
AQI levels in 2025
Jan.
Feb.
Mar.
Apr.
May
Jun.
Jul.
Aug.
Sep.
Oct.
Nov.
Dec.
32AQI
34AQI
26AQI
30AQI
36AQI
55AQI
32AQI
35AQI
29AQI
29AQI
28AQI
36AQI
29AQI
41AQI
40AQI
35AQI
33AQI
33AQI
57AQI
46AQI
44AQI
41AQI
54AQI
47AQI
42AQI
37AQI
35AQI
41AQI
34AQI
36AQI
31AQI
39AQI
33AQI
42AQI
33AQI
34AQI
30AQI
30AQI
30AQI
30AQI
30AQI
31AQI
35AQI
33AQI
31AQI
30AQI
38AQI
35AQI
32AQI
31AQI
30AQI
30AQI
31AQI
32AQI
33AQI
33AQI
34AQI
39AQI
58AQI
52AQI
68AQI
42AQI
41AQI
26AQI
33AQI
31AQI
33AQI
33AQI
35AQI
43AQI
46AQI
45AQI
42AQI
35AQI
26AQI
22AQI
24AQI
18AQI
22AQI
46AQI
52AQI
60AQI
53AQI
70AQI
82AQI
71AQI
51AQI
38AQI
42AQI
33AQI
29AQI
22AQI
21AQI
22AQI
23AQI
26AQI
30AQI
39AQI
27AQI
48AQI
42AQI
38AQI
32AQI
42AQI
35AQI
37AQI
48AQI
54AQI
64AQI
51AQI
45AQI
45AQI
29AQI
38AQI
38AQI
44AQI
50AQI
43AQI
37AQI
46AQI
42AQI
28AQI
32AQI
40AQI
35AQI
29AQI
24AQI
26AQI
28AQI
24AQI
31AQI
32AQI
35AQI
32AQI
38AQI
41AQI
29AQI
47AQI
43AQI
62AQI
45AQI
42AQI
40AQI
37AQI
32AQI
27AQI
25AQI
24AQI
26AQI
24AQI
16AQI
21AQI
28AQI
31AQI
34AQI
40AQI
46AQI
48AQI
54AQI
40AQI
35AQI
31AQI
37AQI
35AQI
34AQI
40AQI
41AQI
50AQI
46AQI
42AQI
35AQI
32AQI
23AQI
26AQI
23AQI
22AQI
25AQI
34AQI
29AQI
36AQI
40AQI
41AQI
45AQI
42AQI
44AQI
51AQI
68AQI
75AQI
77AQI
73AQI
56AQI
50AQI
53AQI
48AQI
42AQI
40AQI
40AQI
43AQI
39AQI
37AQI
35AQI
38AQI
36AQI
37AQI
39AQI
34AQI
34AQI
32AQI
38AQI
30AQI
31AQI
30AQI
33AQI
40AQI
44AQI
61AQI
51AQI
51AQI
50AQI
49AQI
49AQI
43AQI
40AQI
36AQI
34AQI
39AQI
36AQI
38AQI
39AQI
45AQI
45AQI
48AQI
50AQI
51AQI
49AQI
56AQI
56AQI
54AQI
51AQI
45AQI
51AQI
56AQI
53AQI
45AQI
38AQI
38AQI
38AQI
35AQI
37AQI
34AQI
42AQI
38AQI
33AQI
35AQI
44AQI
47AQI
39AQI
No. of days
202539AQI
Highest AQI recorded in
August47AQI
Lowest AQI recorded in
May33AQI
202440AQI
Highest AQI recorded in
July57AQI
Lowest AQI recorded in
December35AQI
202343AQI
Highest AQI recorded in
April48AQI
Lowest AQI recorded in
August34AQI
202243AQI
Highest AQI recorded in
June47AQI
Lowest AQI recorded in
January38AQI
202138AQI
Highest AQI recorded in
December43AQI
Lowest AQI recorded in
April29AQI
202036AQI
Highest AQI recorded in
August44AQI
Lowest AQI recorded in
September28AQI
Most & Least Polluted Years Over the Last 6 Years
Chiba's annual 2025 AQI (39) shows an average percentage change of -1.6% (improved AQI) compared to previous years: 2020 (36), 2021 (38), 2022 (43), 2023 (43), 2024 (40).