4 chome, Koganei, Tokyo, 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
4 chome, Koganei, Tokyo, Japan
AQI Trends: Highest and Lowest
Same Day Analysis (15th August):
On this day, AQI across the 2 years varied significantly: 2026 ranks 2nd highest AQI at 23 of Good air quality, showing improvement over 2025 on the same day.
Day & Night AQI Trend: 14th Aug - 15th Aug 2026
4 chome, Koganei, Tokyo, Japan
4 AM14th Aug 2026
6 PM
3 AM15th Aug 2026
25AQI
8AQI
25AQI
8AQI
In the last 24 hours,
4 chome's AQI reached its highest point of 25 at 4 PM during the Day, while the lowest point, 8, was recorded at 3 AM during the Night between 14th Aug and 15th Aug 2026.
Day & Night AQI Trend : Jul - Aug 2026
4 chome, Koganei, Tokyo, Japan
29°C27/31°C
28°C26/32°C
29°C25/32°C
32°C28/37°C
33°C30/38°C
33°C29/37°C
33°C29/38°C
30°C28/34°C
30°C26/36°C
28°C26/32°C
27°C24/31°C
27°C24/31°C
29°C24/35°C
32°C28/36°C
31°C28/36°C
32°C28/36°C
31°C25/36°C
25°C24/26°C
26°C22/31°C
27°C23/31°C
29°C26/34°C
30°C27/34°C
29°C26/34°C
29°C26/33°C
27°C25/31°C
25°C22/29°C
23°C22/25°C
26°C23/30°C
27°C24/30°C
27°C24/31°C
36AQI
29AQI
34AQI
30AQI
2026 Days Vs Air Quality
4 chome, Koganei, Tokyo, Japan
87%
197
13%
30
Total number of days with different AQI categories in last 227 days in 2026 (138 days remaining)
Under WHO’s Safe Air Quality Limits: 87%
Health Risk Level:
Low
In 2026, 87% of 227 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
4 chome, Koganei, Tokyo, Japan
AQI levels in 2026
Jan.
Feb.
Mar.
Apr.
May
Jun.
Jul.
Aug.
Sep.
Oct.
Nov.
Dec.
25AQI (US)
18AQI (US)
15AQI (US)
21AQI (US)
33AQI (US)
14AQI (US)
21AQI (US)
29AQI (US)
17AQI (US)
30AQI (US)
27AQI (US)
16AQI (US)
32AQI (US)
18AQI (US)
26AQI (US)
48AQI (US)
47AQI (US)
36AQI (US)
43AQI (US)
42AQI (US)
12AQI (US)
21AQI (US)
37AQI (US)
37AQI (US)
45AQI (US)
29AQI (US)
38AQI (US)
10AQI (US)
16AQI (US)
34AQI (US)
34AQI (US)
39AQI (US)
45AQI (US)
32AQI (US)
39AQI (US)
46AQI (US)
50AQI (US)
13AQI (US)
14AQI (US)
33AQI (US)
37AQI (US)
53AQI (US)
29AQI (US)
45AQI (US)
62AQI (US)
50AQI (US)
43AQI (US)
17AQI (US)
33AQI (US)
30AQI (US)
22AQI (US)
47AQI (US)
46AQI (US)
34AQI (US)
31AQI (US)
36AQI (US)
11AQI (US)
35AQI (US)
31AQI (US)
15AQI (US)
80AQI (US)
44AQI (US)
60AQI (US)
57AQI (US)
52AQI (US)
40AQI (US)
17AQI (US)
25AQI (US)
14AQI (US)
27AQI (US)
70AQI (US)
43AQI (US)
46AQI (US)
60AQI (US)
57AQI (US)
53AQI (US)
57AQI (US)
32AQI (US)
30AQI (US)
52AQI (US)
49AQI (US)
53AQI (US)
54AQI (US)
60AQI (US)
30AQI (US)
21AQI (US)
49AQI (US)
53AQI (US)
56AQI (US)
23AQI (US)
23AQI (US)
36AQI (US)
43AQI (US)
43AQI (US)
37AQI (US)
28AQI (US)
36AQI (US)
22AQI (US)
31AQI (US)
46AQI (US)
44AQI (US)
27AQI (US)
35AQI (US)
43AQI (US)
41AQI (US)
35AQI (US)
40AQI (US)
33AQI (US)
39AQI (US)
37AQI (US)
39AQI (US)
46AQI (US)
37AQI (US)
32AQI (US)
45AQI (US)
52AQI (US)
48AQI (US)
42AQI (US)
39AQI (US)
37AQI (US)
48AQI (US)
50AQI (US)
45AQI (US)
29AQI (US)
24AQI (US)
32AQI (US)
32AQI (US)
26AQI (US)
25AQI (US)
28AQI (US)
31AQI (US)
37AQI (US)
47AQI (US)
34AQI (US)
38AQI (US)
85AQI (US)
68AQI (US)
53AQI (US)
49AQI (US)
62AQI (US)
58AQI (US)
59AQI (US)
53AQI (US)
58AQI (US)
47AQI (US)
39AQI (US)
24AQI (US)
25AQI (US)
25AQI (US)
23AQI (US)
27AQI (US)
30AQI (US)
32AQI (US)
22AQI (US)
23AQI (US)
22AQI (US)
21AQI (US)
22AQI (US)
20AQI (US)
22AQI (US)
22AQI (US)
23AQI (US)
24AQI (US)
35AQI (US)
32AQI (US)
14AQI (US)
26AQI (US)
23AQI (US)
24AQI (US)
28AQI (US)
22AQI (US)
18AQI (US)
19AQI (US)
22AQI (US)
21AQI (US)
26AQI (US)
29AQI (US)
26AQI (US)
28AQI (US)
27AQI (US)
25AQI (US)
25AQI (US)
22AQI (US)
22AQI (US)
36AQI (US)
13AQI (US)
22AQI (US)
25AQI (US)
24AQI (US)
20AQI (US)
21AQI (US)
22AQI (US)
27AQI (US)
29AQI (US)
30AQI (US)
31AQI (US)
47AQI (US)
43AQI (US)
22AQI (US)
26AQI (US)
28AQI (US)
46AQI (US)
63AQI (US)
54AQI (US)
48AQI (US)
39AQI (US)
24AQI (US)
23AQI (US)
23AQI (US)
28AQI (US)
32AQI (US)
54AQI (US)
61AQI (US)
39AQI (US)
13AQI (US)
24AQI (US)
23AQI (US)
25AQI (US)
27AQI (US)
24AQI (US)
26AQI (US)
25AQI (US)
30AQI (US)
23AQI (US)
25AQI (US)
18AQI (US)
23AQI (US)
28AQI (US)
36AQI (US)
44AQI (US)
38AQI (US)
41AQI (US)
24AQI (US)
31AQI (US)
27AQI (US)
No. of days
202634AQI (US)
Highest AQI (US) recorded in
March44AQI (US)
Lowest AQI (US) recorded in
June24AQI (US)
202540AQI (US)
Highest AQI (US) recorded in
July46AQI (US)
Lowest AQI (US) recorded in
May22AQI (US)
Most & Least Polluted Years Over the Last 2 Years
4 chome's annual 2026 AQI (US) (34) shows an average percentage change of -15% (improved AQI (US)) compared to previous years: 2025 (40).