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 (14th August):
On this day, AQI across the 2 years varied significantly: 2026 ranks 2nd highest AQI at 18 of Good air quality, showing improvement over 2025 on the same day.
Day & Night AQI Trend: 13th Aug - 14th Aug 2026
4 chome, Koganei, Tokyo, Japan
4 AM13th Aug 2026
6 PM
3 AM14th Aug 2026
36AQI
23AQI
27AQI
8AQI
In the last 24 hours,
4 chome's AQI reached its highest point of 36 at 5 AM during the Day, while the lowest point, 8, was recorded at 3 AM during the Night between 13th Aug and 14th Aug 2026.
Day & Night AQI Trend : Jul - Aug 2026
4 chome, Koganei, Tokyo, Japan
31°C28/36°C
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
38AQI
29AQI
36AQI
30AQI
2026 Days Vs Air Quality
4 chome, Koganei, Tokyo, Japan
87%
196
13%
30
Total number of days with different AQI categories in last 226 days in 2026 (139 days remaining)
Under WHO’s Safe Air Quality Limits: 87%
Health Risk Level:
Low
In 2026, 87% of 226 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)
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).