Suwa, Niiza, 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
Suwa, Niiza, Saitama, Japan
AQI Trends: Highest and Lowest
Same Day Analysis (17th August):
On this day, AQI across the 4 years varied significantly: 2026 ranks 3rd highest AQI at 24 of Good air quality, showing improvement over 2025 and 2023 on the same day.
Day & Night AQI Trend: 17th Aug - 18th Aug 2026
Suwa, Niiza, Saitama, Japan
4 AM17th Aug 2026
6 PM
3 AM18th Aug 2026
36AQI
21AQI
27AQI
21AQI
In the last 24 hours,
Suwa's AQI reached its highest point of 36 at 11 AM during the Day, while the lowest point, 21, was recorded at 3 AM during the Night between 17th Aug and 18th Aug 2026.
Day & Night AQI Trend : Jul - Aug 2026
Suwa, Niiza, Saitama, Japan
32°C28/37°C
33°C30/38°C
33°C29/38°C
33°C29/39°C
30°C28/35°C
30°C25/36°C
29°C26/33°C
27°C24/31°C
27°C24/32°C
30°C25/36°C
32°C28/37°C
32°C28/37°C
32°C28/37°C
31°C25/36°C
25°C24/27°C
26°C22/31°C
27°C23/32°C
30°C26/34°C
30°C27/35°C
30°C27/35°C
30°C27/34°C
27°C25/31°C
24°C22/29°C
24°C22/25°C
26°C23/30°C
27°C24/29°C
27°C24/31°C
27°C24/30°C
13°C8/18°C
28°C25/32°C
44AQI
30AQI
39AQI
32AQI
2026 Days Vs Air Quality
Suwa, Niiza, Saitama, Japan
84%
193
16%
36
Total number of days with different AQI categories in last 230 days in 2026 (135 days remaining)
Under WHO’s Safe Air Quality Limits: 84%
Health Risk Level:
Low
In 2026, 84% of 230 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
Suwa, Niiza, Saitama, Japan
AQI levels in 2026
Jan.
Feb.
Mar.
Apr.
May
Jun.
Jul.
Aug.
Sep.
Oct.
Nov.
Dec.
25AQI (US)
22AQI (US)
24AQI (US)
30AQI (US)
48AQI (US)
16AQI (US)
31AQI (US)
40AQI (US)
21AQI (US)
38AQI (US)
43AQI (US)
20AQI (US)
37AQI (US)
15AQI (US)
36AQI (US)
51AQI (US)
50AQI (US)
21AQI (US)
48AQI (US)
39AQI (US)
15AQI (US)
23AQI (US)
39AQI (US)
41AQI (US)
46AQI (US)
28AQI (US)
41AQI (US)
13AQI (US)
19AQI (US)
36AQI (US)
36AQI (US)
39AQI (US)
43AQI (US)
27AQI (US)
37AQI (US)
59AQI (US)
53AQI (US)
15AQI (US)
18AQI (US)
34AQI (US)
38AQI (US)
50AQI (US)
27AQI (US)
43AQI (US)
46AQI (US)
65AQI (US)
44AQI (US)
21AQI (US)
34AQI (US)
31AQI (US)
34AQI (US)
43AQI (US)
44AQI (US)
43AQI (US)
44AQI (US)
36AQI (US)
10AQI (US)
29AQI (US)
47AQI (US)
37AQI (US)
82AQI (US)
46AQI (US)
59AQI (US)
57AQI (US)
53AQI (US)
48AQI (US)
43AQI (US)
51AQI (US)
58AQI (US)
59AQI (US)
70AQI (US)
42AQI (US)
47AQI (US)
57AQI (US)
58AQI (US)
54AQI (US)
57AQI (US)
32AQI (US)
32AQI (US)
55AQI (US)
49AQI (US)
51AQI (US)
57AQI (US)
62AQI (US)
32AQI (US)
24AQI (US)
49AQI (US)
58AQI (US)
51AQI (US)
23AQI (US)
24AQI (US)
35AQI (US)
44AQI (US)
45AQI (US)
37AQI (US)
29AQI (US)
40AQI (US)
27AQI (US)
35AQI (US)
46AQI (US)
44AQI (US)
33AQI (US)
37AQI (US)
41AQI (US)
41AQI (US)
28AQI (US)
37AQI (US)
32AQI (US)
38AQI (US)
38AQI (US)
40AQI (US)
47AQI (US)
35AQI (US)
33AQI (US)
45AQI (US)
51AQI (US)
49AQI (US)
42AQI (US)
39AQI (US)
39AQI (US)
48AQI (US)
50AQI (US)
51AQI (US)
30AQI (US)
23AQI (US)
30AQI (US)
32AQI (US)
25AQI (US)
26AQI (US)
30AQI (US)
29AQI (US)
34AQI (US)
45AQI (US)
33AQI (US)
36AQI (US)
86AQI (US)
69AQI (US)
53AQI (US)
49AQI (US)
61AQI (US)
59AQI (US)
59AQI (US)
53AQI (US)
58AQI (US)
46AQI (US)
39AQI (US)
24AQI (US)
24AQI (US)
28AQI (US)
27AQI (US)
36AQI (US)
31AQI (US)
30AQI (US)
26AQI (US)
23AQI (US)
22AQI (US)
22AQI (US)
22AQI (US)
21AQI (US)
22AQI (US)
22AQI (US)
24AQI (US)
24AQI (US)
36AQI (US)
38AQI (US)
17AQI (US)
24AQI (US)
24AQI (US)
25AQI (US)
29AQI (US)
23AQI (US)
19AQI (US)
19AQI (US)
22AQI (US)
22AQI (US)
26AQI (US)
29AQI (US)
26AQI (US)
28AQI (US)
27AQI (US)
25AQI (US)
27AQI (US)
22AQI (US)
17AQI (US)
37AQI (US)
23AQI (US)
28AQI (US)
26AQI (US)
25AQI (US)
22AQI (US)
25AQI (US)
28AQI (US)
28AQI (US)
30AQI (US)
30AQI (US)
31AQI (US)
61AQI (US)
45AQI (US)
30AQI (US)
29AQI (US)
39AQI (US)
49AQI (US)
59AQI (US)
57AQI (US)
42AQI (US)
37AQI (US)
29AQI (US)
25AQI (US)
33AQI (US)
39AQI (US)
37AQI (US)
50AQI (US)
56AQI (US)
47AQI (US)
19AQI (US)
37AQI (US)
30AQI (US)
22AQI (US)
33AQI (US)
46AQI (US)
34AQI (US)
30AQI (US)
37AQI (US)
27AQI (US)
26AQI (US)
23AQI (US)
33AQI (US)
25AQI (US)
24AQI (US)
32AQI (US)
38AQI (US)
50AQI (US)
38AQI (US)
42AQI (US)
25AQI (US)
34AQI (US)
32AQI (US)
No. of days
202637AQI (US)
Highest AQI (US) recorded in
March50AQI (US)
Lowest AQI (US) recorded in
June25AQI (US)
202541AQI (US)
Highest AQI (US) recorded in
October51AQI (US)
Lowest AQI (US) recorded in
June31AQI (US)
202344AQI (US)
Highest AQI (US) recorded in
April52AQI (US)
Lowest AQI (US) recorded in
August31AQI (US)
202241AQI (US)
Highest AQI (US) recorded in
March48AQI (US)
Lowest AQI (US) recorded in
August28AQI (US)
202140AQI (US)
Highest AQI (US) recorded in
March47AQI (US)
Lowest AQI (US) recorded in
July32AQI (US)
202039AQI (US)
Highest AQI (US) recorded in
August46AQI (US)
Lowest AQI (US) recorded in
September29AQI (US)
Most & Least Polluted Years Over the Last 6 Years
Suwa's annual 2026 AQI (US) (37) shows an average percentage change of -9.6% (improved AQI (US)) compared to previous years: 2020 (39), 2021 (40), 2022 (41), 2023 (44), 2025 (41).