Tsuiheiji, Ichihara, Chiba, 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
Tsuiheiji, Ichihara, Chiba, Japan
AQI Trends: Highest and Lowest
Same Day Analysis (5th October ):
On this day, AQI across the 5 years varied significantly: 2025 ranks 1st highest AQI at 60 of Moderate air quality on the same day.
Download 2024 Annual Data
World Air Quality Report

Day & Night AQI Trend: 5th Oct - 6th Oct 2025
Tsuiheiji, Ichihara, Chiba, Japan
5 AM5th Oct 2025
5 PM
4 AM6th Oct 2025
AQI
AQI
64AQI
27AQI
In the last 24 hours,
Tsuiheiji's AQI reached its highest point of 64 at 2 PM during the Night, while the lowest point, 27, was recorded at 6 PM during the Night between 5th Oct and 6th Oct 2025.
Day & Night AQI Trend : Sep - Oct 2025
Tsuiheiji, Ichihara, Chiba, Japan
26°C23/30°C
27°C24/29°C
28°C26/31°C
28°C26/31°C
28°C27/30°C
27°C24/30°C
25°C24/28°C
27°C24/29°C
28°C27/29°C
27°C25/30°C
27°C25/30°C
28°C26/31°C
28°C23/31°C
22°C20/23°C
25°C22/27°C
26°C22/30°C
23°C21/25°C
23°C20/26°C
23°C20/26°C
24°C21/27°C
26°C23/30°C
24°C22/27°C
25°C23/27°C
26°C23/29°C
24°C22/27°C
21°C19/21°C
22°C19/26°C
23°C21/26°C
23°C22/26°C
--°C/°C
--°C/°C
41AQI
37AQI
36AQI
36AQI
2025 Days Vs Air Quality
Tsuiheiji, Ichihara, Chiba, Japan
89%
247
11%
31
Total number of days with different AQI categories in last 278 days in 2025 (87 days remaining)
Under WHO’s Safe Air Quality Limits: 89%
Health Risk Level:
Low
In 2025, 89% of 278 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
Tsuiheiji, Ichihara, Chiba, Japan
AQI levels in 2025
Jan.
Feb.
Mar.
Apr.
May
Jun.
Jul.
Aug.
Sep.
Oct.
Nov.
Dec.
31AQI
34AQI
25AQI
31AQI
38AQI
58AQI
31AQI
38AQI
29AQI
30AQI
26AQI
38AQI
28AQI
43AQI
36AQI
33AQI
29AQI
32AQI
55AQI
44AQI
43AQI
40AQI
54AQI
49AQI
45AQI
39AQI
40AQI
39AQI
32AQI
32AQI
29AQI
41AQI
32AQI
48AQI
31AQI
36AQI
30AQI
30AQI
30AQI
30AQI
33AQI
31AQI
34AQI
31AQI
30AQI
30AQI
42AQI
36AQI
34AQI
31AQI
31AQI
31AQI
33AQI
32AQI
33AQI
34AQI
35AQI
40AQI
60AQI
50AQI
69AQI
42AQI
44AQI
27AQI
36AQI
32AQI
35AQI
34AQI
35AQI
41AQI
49AQI
45AQI
43AQI
35AQI
28AQI
22AQI
25AQI
20AQI
24AQI
42AQI
49AQI
59AQI
55AQI
65AQI
83AQI
68AQI
49AQI
37AQI
43AQI
31AQI
30AQI
21AQI
21AQI
22AQI
22AQI
21AQI
29AQI
35AQI
26AQI
45AQI
38AQI
36AQI
26AQI
39AQI
29AQI
33AQI
45AQI
49AQI
61AQI
45AQI
44AQI
39AQI
28AQI
36AQI
36AQI
43AQI
45AQI
38AQI
38AQI
45AQI
41AQI
28AQI
33AQI
38AQI
36AQI
28AQI
25AQI
25AQI
28AQI
21AQI
30AQI
32AQI
35AQI
31AQI
38AQI
38AQI
27AQI
41AQI
42AQI
59AQI
37AQI
39AQI
40AQI
37AQI
31AQI
29AQI
26AQI
26AQI
26AQI
26AQI
17AQI
19AQI
26AQI
29AQI
34AQI
40AQI
44AQI
46AQI
53AQI
38AQI
27AQI
25AQI
32AQI
31AQI
30AQI
31AQI
37AQI
47AQI
44AQI
41AQI
35AQI
31AQI
23AQI
24AQI
21AQI
21AQI
21AQI
31AQI
29AQI
30AQI
34AQI
34AQI
37AQI
38AQI
40AQI
45AQI
60AQI
68AQI
70AQI
70AQI
58AQI
54AQI
57AQI
52AQI
47AQI
44AQI
43AQI
43AQI
41AQI
35AQI
31AQI
33AQI
31AQI
30AQI
34AQI
27AQI
26AQI
24AQI
31AQI
27AQI
29AQI
29AQI
33AQI
39AQI
42AQI
61AQI
48AQI
50AQI
49AQI
46AQI
50AQI
37AQI
38AQI
34AQI
33AQI
40AQI
36AQI
39AQI
37AQI
44AQI
43AQI
47AQI
50AQI
49AQI
47AQI
56AQI
55AQI
54AQI
51AQI
44AQI
51AQI
55AQI
53AQI
43AQI
37AQI
38AQI
42AQI
33AQI
30AQI
29AQI
41AQI
42AQI
38AQI
32AQI
31AQI
31AQI
37AQI
35AQI
32AQI
47AQI
47AQI
37AQI
35AQI
31AQI
30AQI
30AQI
29AQI
33AQI
45AQI
39AQI
34AQI
31AQI
28AQI
39AQI
47AQI
47AQI
51AQI
60AQI
37AQI
35AQI
42AQI
36AQI
33AQI
32AQI
42AQI
46AQI
36AQI
49AQI
No. of days
202538AQI
Highest AQI recorded in
October49AQI
Lowest AQI recorded in
June32AQI
202438AQI
Highest AQI recorded in
July52AQI
Lowest AQI recorded in
October31AQI
202340AQI
Highest AQI recorded in
April47AQI
Lowest AQI recorded in
August26AQI
202250AQI
Highest AQI recorded in
March103AQI
Lowest AQI recorded in
August17AQI
202139AQI
Highest AQI recorded in
May44AQI
Lowest AQI recorded in
April35AQI
202035AQI
Highest AQI recorded in
August41AQI
Lowest AQI recorded in
April28AQI
Most & Least Polluted Years Over the Last 6 Years
Tsuiheiji's annual 2025 AQI (38) shows an average percentage change of -5.6% (improved AQI) compared to previous years: 2020 (35), 2021 (39), 2022 (50), 2023 (40), 2024 (38).