Honcho, Kokubunji, Tokyo, 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, Kokubunji, Tokyo, Japan
AQI Trends: Highest and Lowest
Same Day Analysis (27th September ):
On this day, AQI across the 3 years varied significantly: 2025 ranks 3rd highest AQI at 36 of Good air quality, showing improvement over 2024 and 2023 on the same day.
Download 2024 Annual Data
World Air Quality Report

Day & Night AQI Trend: 28th Sep - 29th Sep 2025
Honcho, Kokubunji, Tokyo, Japan
5 AM28th Sep 2025
5 PM
4 AM29th Sep 2025
AQI
AQI
40AQI
22AQI
In the last 24 hours,
Honcho's AQI reached its highest point of 40 at 3 AM during the Night, while the lowest point, undefined, was recorded at 4 AM during the Night between 28th Sep and 29th Sep 2025.
Day & Night AQI Trend : Aug - Sep 2025
Honcho, Kokubunji, Tokyo, Japan
32°C28/37°C
33°C30/37°C
32°C29/36°C
32°C29/37°C
31°C28/36°C
27°C26/27°C
25°C23/25°C
27°C24/32°C
29°C25/33°C
31°C27/35°C
30°C28/33°C
29°C28/32°C
27°C24/30°C
25°C23/27°C
27°C24/31°C
29°C26/33°C
29°C26/32°C
29°C27/33°C
31°C27/35°C
30°C24/37°C
22°C21/23°C
24°C23/25°C
26°C22/32°C
24°C22/27°C
23°C21/26°C
24°C21/27°C
25°C22/28°C
28°C24/32°C
25°C24/27°C
--°C/°C
--°C/°C
39AQI
31AQI
36AQI
34AQI
2025 Days Vs Air Quality
Honcho, Kokubunji, Tokyo, Japan
91%
247
9%
23
Total number of days with different AQI categories in last 271 days in 2025 (94 days remaining)
Under WHO’s Safe Air Quality Limits: 91%
Health Risk Level:
Very Low
In 2025, 91% of 271 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, Kokubunji, Tokyo, Japan
AQI levels in 2025
Jan.
Feb.
Mar.
Apr.
May
Jun.
Jul.
Aug.
Sep.
Oct.
Nov.
Dec.
28AQI
27AQI
23AQI
26AQI
29AQI
42AQI
28AQI
29AQI
24AQI
24AQI
25AQI
33AQI
29AQI
32AQI
32AQI
27AQI
28AQI
28AQI
38AQI
39AQI
35AQI
31AQI
38AQI
41AQI
34AQI
34AQI
28AQI
35AQI
26AQI
29AQI
27AQI
38AQI
39AQI
35AQI
33AQI
31AQI
27AQI
28AQI
29AQI
28AQI
27AQI
32AQI
32AQI
44AQI
28AQI
42AQI
34AQI
37AQI
30AQI
29AQI
29AQI
30AQI
30AQI
31AQI
32AQI
33AQI
33AQI
36AQI
45AQI
49AQI
49AQI
37AQI
35AQI
28AQI
32AQI
32AQI
37AQI
36AQI
34AQI
35AQI
43AQI
43AQI
32AQI
30AQI
20AQI
17AQI
20AQI
15AQI
20AQI
33AQI
40AQI
44AQI
46AQI
60AQI
71AQI
66AQI
42AQI
32AQI
36AQI
28AQI
26AQI
20AQI
20AQI
23AQI
25AQI
20AQI
23AQI
29AQI
25AQI
36AQI
35AQI
32AQI
25AQI
32AQI
24AQI
26AQI
39AQI
46AQI
53AQI
40AQI
39AQI
35AQI
20AQI
26AQI
30AQI
35AQI
36AQI
33AQI
25AQI
34AQI
29AQI
24AQI
22AQI
35AQI
27AQI
22AQI
20AQI
25AQI
24AQI
17AQI
23AQI
21AQI
29AQI
29AQI
30AQI
37AQI
21AQI
36AQI
38AQI
58AQI
51AQI
39AQI
42AQI
36AQI
25AQI
25AQI
24AQI
25AQI
31AQI
21AQI
16AQI
19AQI
25AQI
23AQI
22AQI
35AQI
38AQI
42AQI
49AQI
38AQI
28AQI
27AQI
32AQI
32AQI
26AQI
24AQI
29AQI
38AQI
31AQI
33AQI
33AQI
28AQI
22AQI
21AQI
19AQI
17AQI
17AQI
22AQI
21AQI
24AQI
32AQI
36AQI
42AQI
46AQI
46AQI
48AQI
55AQI
70AQI
74AQI
79AQI
64AQI
55AQI
57AQI
55AQI
48AQI
47AQI
46AQI
46AQI
43AQI
39AQI
37AQI
38AQI
39AQI
41AQI
41AQI
38AQI
37AQI
34AQI
39AQI
39AQI
33AQI
34AQI
33AQI
41AQI
44AQI
58AQI
52AQI
51AQI
46AQI
47AQI
47AQI
41AQI
39AQI
35AQI
33AQI
36AQI
34AQI
36AQI
40AQI
42AQI
46AQI
46AQI
47AQI
48AQI
48AQI
56AQI
55AQI
56AQI
50AQI
48AQI
51AQI
56AQI
52AQI
46AQI
38AQI
37AQI
34AQI
28AQI
28AQI
29AQI
38AQI
41AQI
37AQI
31AQI
32AQI
29AQI
36AQI
39AQI
37AQI
45AQI
44AQI
34AQI
33AQI
29AQI
30AQI
29AQI
29AQI
31AQI
43AQI
36AQI
31AQI
33AQI
37AQI
30AQI
29AQI
28AQI
47AQI
46AQI
35AQI
No. of days
202535AQI
Highest AQI recorded in
July47AQI
Lowest AQI recorded in
June28AQI
202436AQI
Highest AQI recorded in
April46AQI
Lowest AQI recorded in
December27AQI
202337AQI
Highest AQI recorded in
April48AQI
Lowest AQI recorded in
August28AQI
202019AQI
Highest AQI recorded in
September19AQI
Lowest AQI recorded in
September19AQI
Most & Least Polluted Years Over the Last 4 Years
Honcho's annual 2025 AQI (35) shows an average percentage change of 25.5% (worsened AQI) compared to previous years: 2020 (19), 2023 (37), 2024 (36).