Innai, Ichikawa, Chiba, Japan Historical Air Quality Analysis
Dive into detailed Air Quality Insights with historical data, monthly patterns, and yearly trends at your fingertips!
August Air Quality Analysis
Innai, Ichikawa, Chiba, Japan
AQI Trends: Highest and Lowest
Same Day Analysis (21st August ):
On this day, AQI across the 5 years varied significantly: 2025 ranks 1st highest AQI at 48 of Good air quality on the same day.
Download 2024 Annual Data
World Air Quality Report

Day & Night AQI Trend: 21st Aug - 22nd Aug 2025
Innai, Ichikawa, Chiba, Japan
4 AM21st Aug 2025
6 PM
3 AM22nd Aug 2025
61AQI
46AQI
53AQI
45AQI
In the last 24 hours,
Innai's AQI reached its highest point of 61 at 3 PM during the Day, while the lowest point, 45, was recorded at 1 AM during the Night between 21st Aug and 22nd Aug 2025.
Day & Night AQI Trend : Jul - Aug 2025
Innai, Ichikawa, Chiba, Japan
29°C27/33°C
29°C27/34°C
30°C27/33°C
30°C28/33°C
29°C27/33°C
30°C27/35°C
31°C26/37°C
29°C26/35°C
28°C25/33°C
28°C25/32°C
30°C26/34°C
31°C27/36°C
30°C28/34°C
31°C29/35°C
32°C29/36°C
31°C28/34°C
29°C24/34°C
29°C25/33°C
27°C25/28°C
28°C27/29°C
28°C26/30°C
28°C26/31°C
28°C25/33°C
29°C26/32°C
28°C26/32°C
29°C27/32°C
30°C27/36°C
29°C27/33°C
30°C27/33°C
31°C27/36°C
--°C/°C
44AQI
37AQI
40AQI
36AQI
2025 Days Vs Air Quality
Innai, Ichikawa, Chiba, Japan
90%
209
10%
24
Total number of days with different AQI categories in last 234 days in 2025 (131 days remaining)
Under WHO’s Safe Air Quality Limits: 90%
Health Risk Level:
Very Low
In 2025, 90% of 234 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
Innai, Ichikawa, Chiba, Japan
AQI levels in 2025
Jan.
Feb.
Mar.
Apr.
May
Jun.
Jul.
Aug.
Sep.
Oct.
Nov.
Dec.
32AQI
32AQI
25AQI
29AQI
38AQI
48AQI
38AQI
34AQI
31AQI
29AQI
29AQI
37AQI
29AQI
43AQI
37AQI
36AQI
31AQI
34AQI
53AQI
42AQI
44AQI
41AQI
55AQI
47AQI
44AQI
37AQI
41AQI
41AQI
33AQI
34AQI
30AQI
40AQI
35AQI
42AQI
31AQI
33AQI
27AQI
29AQI
28AQI
29AQI
27AQI
30AQI
33AQI
46AQI
32AQI
44AQI
38AQI
38AQI
32AQI
31AQI
30AQI
30AQI
30AQI
32AQI
33AQI
33AQI
37AQI
40AQI
58AQI
51AQI
66AQI
41AQI
41AQI
25AQI
35AQI
31AQI
36AQI
34AQI
35AQI
45AQI
50AQI
41AQI
40AQI
37AQI
28AQI
21AQI
26AQI
19AQI
24AQI
43AQI
49AQI
57AQI
53AQI
66AQI
79AQI
71AQI
49AQI
38AQI
41AQI
33AQI
30AQI
22AQI
20AQI
19AQI
25AQI
25AQI
30AQI
39AQI
27AQI
47AQI
38AQI
40AQI
28AQI
41AQI
29AQI
36AQI
46AQI
52AQI
62AQI
50AQI
45AQI
45AQI
32AQI
41AQI
37AQI
48AQI
48AQI
44AQI
35AQI
46AQI
39AQI
28AQI
31AQI
36AQI
35AQI
27AQI
24AQI
26AQI
28AQI
23AQI
29AQI
24AQI
35AQI
35AQI
38AQI
41AQI
29AQI
46AQI
40AQI
61AQI
42AQI
42AQI
39AQI
37AQI
28AQI
28AQI
24AQI
23AQI
27AQI
23AQI
16AQI
22AQI
28AQI
31AQI
32AQI
38AQI
46AQI
47AQI
55AQI
40AQI
32AQI
31AQI
37AQI
37AQI
32AQI
34AQI
41AQI
49AQI
45AQI
44AQI
39AQI
34AQI
26AQI
26AQI
25AQI
21AQI
21AQI
28AQI
29AQI
32AQI
36AQI
36AQI
39AQI
39AQI
41AQI
47AQI
61AQI
73AQI
76AQI
75AQI
60AQI
52AQI
54AQI
52AQI
44AQI
44AQI
43AQI
43AQI
40AQI
32AQI
31AQI
32AQI
33AQI
35AQI
35AQI
30AQI
29AQI
27AQI
34AQI
35AQI
32AQI
29AQI
32AQI
41AQI
44AQI
61AQI
50AQI
51AQI
49AQI
47AQI
49AQI
38AQI
39AQI
35AQI
32AQI
37AQI
34AQI
36AQI
38AQI
43AQI
45AQI
48AQI
48AQI
37AQI
35AQI
42AQI
38AQI
32AQI
35AQI
43AQI
43AQI
No. of days
202538AQI
Highest AQI recorded in
July43AQI
Lowest AQI recorded in
May32AQI
202439AQI
Highest AQI recorded in
July51AQI
Lowest AQI recorded in
September30AQI
202340AQI
Highest AQI recorded in
April49AQI
Lowest AQI recorded in
August27AQI
202242AQI
Highest AQI recorded in
August57AQI
Lowest AQI recorded in
September30AQI
202144AQI
Highest AQI recorded in
August54AQI
Lowest AQI recorded in
February37AQI
202038AQI
Highest AQI recorded in
August49AQI
Lowest AQI recorded in
May30AQI
Most & Least Polluted Years Over the Last 6 Years
Innai's annual 2025 AQI (38) shows an average percentage change of -6.5% (improved AQI) compared to previous years: 2020 (38), 2021 (44), 2022 (42), 2023 (40), 2024 (39).