Ogawacho, 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
Ogawacho, Kokubunji, Tokyo, Japan
AQI Trends: Highest and Lowest
Same Day Analysis (28th September ):
On this day, AQI across the 5 years varied significantly: 2025 ranks 3rd highest AQI at 35 of Good air quality, showing improvement over 2023 and 2022 on the same day.
Download 2024 Annual Data
World Air Quality Report

Day & Night AQI Trend: 28th Sep - 29th Sep 2025
Ogawacho, Kokubunji, Tokyo, Japan
5 AM28th Sep 2025
5 PM
4 AM29th Sep 2025
49AQI
25AQI
31AQI
17AQI
In the last 24 hours,
Ogawacho's AQI reached its highest point of 49 at 11 AM during the Day, while the lowest point, 17, was recorded at 3 AM during the Night between 28th Sep and 29th Sep 2025.
Day & Night AQI Trend : Aug - Sep 2025
Ogawacho, 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
25°C23/28°C
--°C/°C
40AQI
35AQI
36AQI
36AQI
2025 Days Vs Air Quality
Ogawacho, Kokubunji, Tokyo, Japan
92%
248
8%
23
Total number of days with different AQI categories in last 272 days in 2025 (93 days remaining)
Under WHO’s Safe Air Quality Limits: 92%
Health Risk Level:
Very Low
In 2025, 92% of 272 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
Ogawacho, Kokubunji, Tokyo, Japan
AQI levels in 2025
Jan.
Feb.
Mar.
Apr.
May
Jun.
Jul.
Aug.
Sep.
Oct.
Nov.
Dec.
27AQI
26AQI
24AQI
26AQI
23AQI
29AQI
25AQI
28AQI
25AQI
25AQI
23AQI
26AQI
27AQI
26AQI
27AQI
23AQI
27AQI
25AQI
30AQI
27AQI
31AQI
30AQI
30AQI
36AQI
32AQI
33AQI
23AQI
30AQI
26AQI
27AQI
28AQI
29AQI
33AQI
28AQI
31AQI
29AQI
27AQI
28AQI
29AQI
29AQI
28AQI
30AQI
28AQI
33AQI
28AQI
28AQI
32AQI
34AQI
30AQI
30AQI
30AQI
32AQI
30AQI
32AQI
32AQI
34AQI
34AQI
38AQI
40AQI
46AQI
44AQI
34AQI
31AQI
27AQI
31AQI
32AQI
32AQI
36AQI
34AQI
34AQI
33AQI
37AQI
25AQI
21AQI
18AQI
16AQI
16AQI
13AQI
16AQI
22AQI
25AQI
29AQI
30AQI
51AQI
61AQI
58AQI
38AQI
30AQI
35AQI
28AQI
23AQI
20AQI
18AQI
18AQI
18AQI
14AQI
14AQI
17AQI
15AQI
20AQI
21AQI
20AQI
18AQI
21AQI
19AQI
17AQI
21AQI
26AQI
30AQI
25AQI
23AQI
22AQI
15AQI
15AQI
16AQI
18AQI
19AQI
19AQI
14AQI
19AQI
18AQI
16AQI
15AQI
19AQI
16AQI
17AQI
14AQI
16AQI
16AQI
13AQI
15AQI
15AQI
17AQI
18AQI
19AQI
20AQI
17AQI
22AQI
22AQI
37AQI
39AQI
29AQI
27AQI
23AQI
18AQI
18AQI
17AQI
20AQI
24AQI
17AQI
14AQI
15AQI
16AQI
16AQI
16AQI
19AQI
20AQI
22AQI
26AQI
23AQI
21AQI
20AQI
22AQI
22AQI
19AQI
20AQI
20AQI
28AQI
24AQI
26AQI
24AQI
19AQI
13AQI
13AQI
14AQI
15AQI
15AQI
20AQI
17AQI
19AQI
39AQI
42AQI
47AQI
47AQI
49AQI
52AQI
61AQI
78AQI
81AQI
83AQI
60AQI
49AQI
54AQI
52AQI
41AQI
40AQI
40AQI
40AQI
36AQI
33AQI
36AQI
38AQI
41AQI
46AQI
46AQI
43AQI
42AQI
38AQI
44AQI
44AQI
35AQI
37AQI
35AQI
42AQI
46AQI
61AQI
52AQI
51AQI
47AQI
48AQI
51AQI
37AQI
37AQI
35AQI
33AQI
36AQI
36AQI
39AQI
40AQI
42AQI
45AQI
48AQI
49AQI
49AQI
49AQI
56AQI
57AQI
56AQI
52AQI
48AQI
52AQI
55AQI
54AQI
44AQI
38AQI
37AQI
36AQI
30AQI
29AQI
30AQI
39AQI
41AQI
37AQI
31AQI
32AQI
28AQI
38AQI
39AQI
39AQI
49AQI
47AQI
36AQI
34AQI
27AQI
29AQI
30AQI
31AQI
34AQI
57AQI
35AQI
35AQI
27AQI
31AQI
32AQI
19AQI
20AQI
20AQI
48AQI
46AQI
36AQI
No. of days
202531AQI
Highest AQI recorded in
July48AQI
Lowest AQI recorded in
April19AQI
202432AQI
Highest AQI recorded in
July50AQI
Lowest AQI recorded in
December25AQI
202331AQI
Highest AQI recorded in
April41AQI
Lowest AQI recorded in
August20AQI
202231AQI
Highest AQI recorded in
August51AQI
Lowest AQI recorded in
December24AQI
202124AQI
Highest AQI recorded in
June41AQI
Lowest AQI recorded in
February11AQI
202016AQI
Highest AQI recorded in
August26AQI
Lowest AQI recorded in
April11AQI
Most & Least Polluted Years Over the Last 6 Years
Ogawacho's annual 2025 AQI (31) shows an average percentage change of 24.6% (worsened AQI) compared to previous years: 2020 (16), 2021 (24), 2022 (31), 2023 (31), 2024 (32).