Koizuka, Kumagaya, Saitama, 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
Koizuka, Kumagaya, Saitama, Japan
AQI Trends: Highest and Lowest
Same Day Analysis (16th August):
On this day, AQI across the 5 years varied significantly: 2026 ranks 3rd highest AQI at 26 of Good air quality, showing improvement over 2025 and 2023 on the same day.
Day & Night AQI Trend: 15th Aug - 16th Aug 2026
Koizuka, Kumagaya, Saitama, Japan
4 AM15th Aug 2026
6 PM
3 AM16th Aug 2026
29AQI
23AQI
25AQI
23AQI
In the last 24 hours,
Koizuka's AQI reached its highest point of 29 at 11 AM during the Day, while the lowest point, 23, was recorded at 2 AM during the Night between 15th Aug and 16th Aug 2026.
Day & Night AQI Trend : Jul - Aug 2026
Koizuka, Kumagaya, Saitama, Japan
27°C25/28°C
29°C25/34°C
32°C27/38°C
33°C29/39°C
33°C28/39°C
32°C28/38°C
29°C26/34°C
29°C25/36°C
28°C26/33°C
27°C24/32°C
26°C23/29°C
29°C23/36°C
31°C26/37°C
31°C26/36°C
32°C27/37°C
30°C24/37°C
24°C23/26°C
25°C22/31°C
27°C22/32°C
29°C26/34°C
30°C26/36°C
30°C27/36°C
29°C27/33°C
27°C24/32°C
24°C21/28°C
22°C21/24°C
25°C22/29°C
25°C23/28°C
26°C24/30°C
26°C23/29°C
33AQI
29AQI
34AQI
31AQI
2026 Days Vs Air Quality
Koizuka, Kumagaya, Saitama, Japan
86%
196
14%
32
Total number of days with different AQI categories in last 228 days in 2026 (137 days remaining)
Under WHO’s Safe Air Quality Limits: 86%
Health Risk Level:
Low
In 2026, 86% of 228 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
Koizuka, Kumagaya, Saitama, Japan
AQI levels in 2026
Jan.
Feb.
Mar.
Apr.
May
Jun.
Jul.
Aug.
Sep.
Oct.
Nov.
Dec.
19AQI (US)
17AQI (US)
17AQI (US)
23AQI (US)
27AQI (US)
17AQI (US)
28AQI (US)
31AQI (US)
18AQI (US)
31AQI (US)
35AQI (US)
14AQI (US)
26AQI (US)
16AQI (US)
31AQI (US)
43AQI (US)
41AQI (US)
27AQI (US)
45AQI (US)
32AQI (US)
11AQI (US)
25AQI (US)
35AQI (US)
36AQI (US)
43AQI (US)
25AQI (US)
35AQI (US)
27AQI (US)
25AQI (US)
35AQI (US)
37AQI (US)
33AQI (US)
41AQI (US)
28AQI (US)
41AQI (US)
51AQI (US)
40AQI (US)
14AQI (US)
14AQI (US)
32AQI (US)
35AQI (US)
45AQI (US)
28AQI (US)
42AQI (US)
59AQI (US)
64AQI (US)
38AQI (US)
19AQI (US)
32AQI (US)
30AQI (US)
34AQI (US)
48AQI (US)
43AQI (US)
44AQI (US)
44AQI (US)
43AQI (US)
9AQI (US)
28AQI (US)
43AQI (US)
35AQI (US)
74AQI (US)
45AQI (US)
61AQI (US)
60AQI (US)
54AQI (US)
48AQI (US)
45AQI (US)
53AQI (US)
59AQI (US)
61AQI (US)
68AQI (US)
40AQI (US)
35AQI (US)
13AQI (US)
28AQI (US)
56AQI (US)
59AQI (US)
39AQI (US)
33AQI (US)
52AQI (US)
56AQI (US)
57AQI (US)
53AQI (US)
64AQI (US)
28AQI (US)
20AQI (US)
44AQI (US)
59AQI (US)
56AQI (US)
37AQI (US)
19AQI (US)
23AQI (US)
47AQI (US)
58AQI (US)
32AQI (US)
23AQI (US)
45AQI (US)
25AQI (US)
35AQI (US)
50AQI (US)
40AQI (US)
30AQI (US)
31AQI (US)
41AQI (US)
41AQI (US)
33AQI (US)
33AQI (US)
33AQI (US)
34AQI (US)
36AQI (US)
40AQI (US)
47AQI (US)
35AQI (US)
32AQI (US)
46AQI (US)
52AQI (US)
49AQI (US)
42AQI (US)
40AQI (US)
40AQI (US)
49AQI (US)
51AQI (US)
46AQI (US)
30AQI (US)
21AQI (US)
30AQI (US)
31AQI (US)
28AQI (US)
26AQI (US)
27AQI (US)
29AQI (US)
37AQI (US)
39AQI (US)
34AQI (US)
46AQI (US)
86AQI (US)
68AQI (US)
54AQI (US)
49AQI (US)
62AQI (US)
60AQI (US)
61AQI (US)
55AQI (US)
58AQI (US)
49AQI (US)
40AQI (US)
25AQI (US)
25AQI (US)
25AQI (US)
27AQI (US)
32AQI (US)
34AQI (US)
31AQI (US)
16AQI (US)
19AQI (US)
22AQI (US)
20AQI (US)
21AQI (US)
20AQI (US)
23AQI (US)
23AQI (US)
25AQI (US)
24AQI (US)
27AQI (US)
34AQI (US)
20AQI (US)
20AQI (US)
24AQI (US)
25AQI (US)
28AQI (US)
22AQI (US)
19AQI (US)
19AQI (US)
21AQI (US)
22AQI (US)
26AQI (US)
29AQI (US)
27AQI (US)
28AQI (US)
26AQI (US)
24AQI (US)
25AQI (US)
21AQI (US)
16AQI (US)
41AQI (US)
24AQI (US)
28AQI (US)
26AQI (US)
25AQI (US)
25AQI (US)
26AQI (US)
30AQI (US)
32AQI (US)
34AQI (US)
42AQI (US)
36AQI (US)
45AQI (US)
40AQI (US)
27AQI (US)
27AQI (US)
26AQI (US)
49AQI (US)
62AQI (US)
50AQI (US)
34AQI (US)
30AQI (US)
27AQI (US)
26AQI (US)
30AQI (US)
30AQI (US)
26AQI (US)
36AQI (US)
37AQI (US)
37AQI (US)
25AQI (US)
24AQI (US)
27AQI (US)
23AQI (US)
34AQI (US)
28AQI (US)
28AQI (US)
29AQI (US)
30AQI (US)
32AQI (US)
34AQI (US)
21AQI (US)
25AQI (US)
26AQI (US)
28AQI (US)
37AQI (US)
48AQI (US)
38AQI (US)
42AQI (US)
24AQI (US)
32AQI (US)
29AQI (US)
No. of days
202635AQI (US)
Highest AQI (US) recorded in
March48AQI (US)
Lowest AQI (US) recorded in
June24AQI (US)
202541AQI (US)
Highest AQI (US) recorded in
October51AQI (US)
Lowest AQI (US) recorded in
September35AQI (US)
202440AQI (US)
Highest AQI (US) recorded in
April53AQI (US)
Lowest AQI (US) recorded in
August32AQI (US)
202342AQI (US)
Highest AQI (US) recorded in
April51AQI (US)
Lowest AQI (US) recorded in
August28AQI (US)
202240AQI (US)
Highest AQI (US) recorded in
August51AQI (US)
Lowest AQI (US) recorded in
December31AQI (US)
202139AQI (US)
Highest AQI (US) recorded in
March46AQI (US)
Lowest AQI (US) recorded in
August33AQI (US)
202037AQI (US)
Highest AQI (US) recorded in
November46AQI (US)
Lowest AQI (US) recorded in
September27AQI (US)
Most & Least Polluted Years Over the Last 7 Years
Koizuka's annual 2026 AQI (US) (35) shows an average percentage change of -11.9% (improved AQI (US)) compared to previous years: 2020 (37), 2021 (39), 2022 (40), 2023 (42), 2024 (40), 2025 (41).