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 (3rd August ):
On this day, AQI across the 1 years varied significantly: 2025 ranks 1st highest AQI at 37 of Good air quality on the same day.
Download 2024 Annual Data
World Air Quality Report

Day & Night AQI Trend: 3rd Aug - 4th Aug 2025
4 chome, Koganei, Tokyo, Japan
4 AM3rd Aug 2025
6 PM
3 AM4th Aug 2025
AQI
AQI
59AQI
37AQI
In the last 24 hours,
4 chome's AQI reached its highest point of 59 at 12 PM during the Night, while the lowest point, undefined, was recorded at 3 AM during the Night between 3rd Aug and 4th Aug 2025.
Day & Night AQI Trend : Jul - Aug 2025
4 chome, Koganei, Tokyo, Japan
30°C27/33°C
31°C28/36°C
31°C28/35°C
30°C28/34°C
30°C27/34°C
29°C24/35°C
24°C23/27°C
25°C22/29°C
27°C24/31°C
27°C25/30°C
28°C26/30°C
28°C26/31°C
29°C26/32°C
28°C25/32°C
29°C26/32°C
30°C27/34°C
31°C28/35°C
31°C28/35°C
31°C28/35°C
31°C28/36°C
32°C29/36°C
32°C29/36°C
31°C29/35°C
32°C29/36°C
31°C27/37°C
31°C27/36°C
29°C26/34°C
28°C26/32°C
31°C27/36°C
--°C/°C
--°C/°C
53AQI
43AQI
46AQI
41AQI
2025 Days Vs Air Quality
4 chome, Koganei, Tokyo, Japan
88%
59
12%
8
Total number of days with different AQI categories in last 215 days in 2025 (150 days remaining)
Under WHO’s Safe Air Quality Limits: 88%
Health Risk Level:
Low
In 2025, 88% of 215 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 2025
Jan.
Feb.
Mar.
Apr.
May
Jun.
Jul.
Aug.
Sep.
Oct.
Nov.
Dec.
32AQI
19AQI
15AQI
19AQI
25AQI
21AQI
23AQI
34AQI
38AQI
41AQI
48AQI
35AQI
32AQI
27AQI
33AQI
32AQI
27AQI
25AQI
29AQI
38AQI
32AQI
33AQI
34AQI
27AQI
19AQI
19AQI
17AQI
16AQI
16AQI
22AQI
22AQI
26AQI
34AQI
38AQI
45AQI
41AQI
44AQI
47AQI
54AQI
69AQI
75AQI
78AQI
63AQI
55AQI
56AQI
55AQI
47AQI
47AQI
46AQI
46AQI
42AQI
38AQI
37AQI
38AQI
37AQI
40AQI
41AQI
38AQI
37AQI
34AQI
37AQI
39AQI
32AQI
34AQI
33AQI
39AQI
37AQI
22AQI
28AQI
46AQI
36AQI
No. of days
202537AQI
Highest AQI recorded in
July46AQI
Lowest AQI recorded in
May22AQI
Most & Least Polluted Years Over the Last 1 Years
4 chome's annual 2025 AQI (37) shows an average percentage change of NaN% (improved AQI) compared to previous years: .