Honcho, Kawaguchi, Saitama, 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
Honcho, Kawaguchi, Saitama, Japan
AQI Trends: Highest and Lowest
Same Day Analysis (25th September ):
On this day, AQI across the 2 years varied significantly: 2025 ranks 2nd highest AQI at 33 of Good air quality, showing improvement over 2024 on the same day.
Download 2024 Annual Data
World Air Quality Report

Day & Night AQI Trend: 25th Sep - 26th Sep 2025
Honcho, Kawaguchi, Saitama, Japan
5 AM25th Sep 2025
5 PM
4 AM26th Sep 2025
42AQI
31AQI
45AQI
33AQI
In the last 24 hours,
Honcho's AQI reached its highest point of 45 at 4 AM during the Night, while the lowest point, 31, was recorded at 9 AM during the Day between 25th Sep and 26th Sep 2025.
Day & Night AQI Trend : Aug - Sep 2025
Honcho, Kawaguchi, Saitama, Japan
32°C29/36°C
30°C27/33°C
30°C27/34°C
33°C28/38°C
33°C30/37°C
31°C28/35°C
32°C30/36°C
32°C30/36°C
28°C27/29°C
26°C24/26°C
28°C24/32°C
29°C26/33°C
31°C27/36°C
30°C28/33°C
29°C28/31°C
27°C24/30°C
25°C24/28°C
27°C24/31°C
30°C27/33°C
29°C27/32°C
30°C27/33°C
31°C28/35°C
30°C24/37°C
23°C22/23°C
25°C23/27°C
27°C22/32°C
24°C22/27°C
24°C21/27°C
24°C21/28°C
25°C23/29°C
--°C/°C
41AQI
38AQI
41AQI
37AQI
2025 Days Vs Air Quality
Honcho, Kawaguchi, Saitama, Japan
93%
249
7%
19
Total number of days with different AQI categories in last 269 days in 2025 (96 days remaining)
Under WHO’s Safe Air Quality Limits: 93%
Health Risk Level:
Very Low
In 2025, 93% of 269 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
Honcho, Kawaguchi, Saitama, Japan
AQI levels in 2025
Jan.
Feb.
Mar.
Apr.
May
Jun.
Jul.
Aug.
Sep.
Oct.
Nov.
Dec.
26AQI
22AQI
23AQI
25AQI
24AQI
30AQI
25AQI
26AQI
24AQI
25AQI
23AQI
27AQI
29AQI
27AQI
29AQI
24AQI
29AQI
26AQI
31AQI
33AQI
32AQI
33AQI
33AQI
35AQI
33AQI
32AQI
25AQI
30AQI
27AQI
28AQI
28AQI
29AQI
30AQI
26AQI
29AQI
29AQI
26AQI
26AQI
29AQI
28AQI
26AQI
30AQI
28AQI
32AQI
28AQI
30AQI
33AQI
34AQI
30AQI
30AQI
29AQI
29AQI
31AQI
31AQI
32AQI
32AQI
34AQI
36AQI
40AQI
44AQI
48AQI
35AQI
32AQI
24AQI
31AQI
31AQI
32AQI
34AQI
33AQI
32AQI
37AQI
35AQI
27AQI
24AQI
20AQI
16AQI
17AQI
14AQI
18AQI
27AQI
31AQI
32AQI
34AQI
53AQI
63AQI
56AQI
38AQI
31AQI
28AQI
23AQI
24AQI
21AQI
18AQI
18AQI
19AQI
12AQI
13AQI
14AQI
14AQI
16AQI
18AQI
18AQI
16AQI
18AQI
18AQI
16AQI
18AQI
22AQI
24AQI
20AQI
17AQI
14AQI
13AQI
14AQI
16AQI
16AQI
16AQI
15AQI
14AQI
15AQI
16AQI
17AQI
16AQI
18AQI
17AQI
14AQI
14AQI
15AQI
16AQI
13AQI
14AQI
15AQI
17AQI
16AQI
19AQI
18AQI
16AQI
20AQI
19AQI
28AQI
25AQI
22AQI
19AQI
17AQI
15AQI
17AQI
16AQI
15AQI
16AQI
15AQI
14AQI
14AQI
16AQI
16AQI
15AQI
17AQI
18AQI
19AQI
23AQI
18AQI
18AQI
17AQI
20AQI
19AQI
16AQI
16AQI
17AQI
23AQI
25AQI
26AQI
25AQI
20AQI
12AQI
12AQI
14AQI
15AQI
15AQI
18AQI
18AQI
21AQI
35AQI
40AQI
44AQI
46AQI
46AQI
52AQI
64AQI
78AQI
80AQI
83AQI
62AQI
51AQI
54AQI
54AQI
44AQI
44AQI
41AQI
42AQI
39AQI
35AQI
34AQI
37AQI
40AQI
43AQI
44AQI
41AQI
40AQI
36AQI
42AQI
39AQI
36AQI
36AQI
32AQI
39AQI
44AQI
57AQI
51AQI
50AQI
48AQI
47AQI
48AQI
40AQI
40AQI
36AQI
32AQI
35AQI
35AQI
36AQI
39AQI
44AQI
46AQI
46AQI
48AQI
49AQI
49AQI
56AQI
55AQI
53AQI
50AQI
47AQI
49AQI
54AQI
51AQI
44AQI
37AQI
36AQI
41AQI
36AQI
29AQI
29AQI
39AQI
42AQI
37AQI
32AQI
32AQI
28AQI
35AQI
39AQI
41AQI
47AQI
49AQI
37AQI
38AQI
32AQI
31AQI
30AQI
31AQI
33AQI
28AQI
30AQI
32AQI
17AQI
17AQI
19AQI
47AQI
45AQI
36AQI
No. of days
202530AQI
Highest AQI recorded in
July47AQI
Lowest AQI recorded in
April17AQI
202434AQI
Highest AQI recorded in
September49AQI
Lowest AQI recorded in
March6AQI
202316AQI
Highest AQI recorded in
December16AQI
Lowest AQI recorded in
November11AQI
202015AQI
Highest AQI recorded in
September15AQI
Lowest AQI recorded in
September15AQI
Most & Least Polluted Years Over the Last 4 Years
Honcho's annual 2025 AQI (30) shows an average percentage change of 61.1% (worsened AQI) compared to previous years: 2020 (15), 2023 (16), 2024 (34).