Nagano, Gyoda, 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
Nagano, Gyoda, Saitama, Japan
AQI Trends: Highest and Lowest
Same Day Analysis (15th August):
On this day, AQI across the 5 years varied significantly: 2026 ranks 4th highest AQI at 23 of Good air quality, showing improvement over 2025, 2024 and 2023 on the same day.
Day & Night AQI Trend: 14th Aug - 15th Aug 2026
Nagano, Gyoda, Saitama, Japan
4 AM14th Aug 2026
6 PM
3 AM15th Aug 2026
23AQI
8AQI
27AQI
21AQI
In the last 24 hours,
Nagano's AQI reached its highest point of 27 at 10 PM during the Night, while the lowest point, 8, was recorded at 10 AM during the Day between 14th Aug and 15th Aug 2026.
Day & Night AQI Trend : Jul - Aug 2026
Nagano, Gyoda, Saitama, Japan
29°C26/31°C
27°C25/30°C
30°C26/34°C
33°C28/38°C
34°C29/39°C
34°C29/40°C
33°C28/39°C
29°C27/35°C
29°C25/36°C
28°C26/33°C
27°C24/32°C
26°C24/30°C
29°C23/37°C
31°C27/37°C
31°C27/36°C
32°C27/38°C
31°C24/37°C
24°C23/26°C
26°C22/31°C
27°C22/33°C
30°C26/34°C
31°C27/36°C
31°C27/36°C
29°C25/33°C
27°C24/32°C
24°C22/28°C
23°C22/25°C
25°C23/29°C
26°C23/29°C
26°C24/31°C
34AQI
27AQI
33AQI
29AQI
2026 Days Vs Air Quality
Nagano, Gyoda, Saitama, Japan
85%
193
15%
34
Total number of days with different AQI categories in last 227 days in 2026 (138 days remaining)
Under WHO’s Safe Air Quality Limits: 85%
Health Risk Level:
Low
In 2026, 85% 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
Nagano, Gyoda, Saitama, Japan
AQI levels in 2026
Jan.
Feb.
Mar.
Apr.
May
Jun.
Jul.
Aug.
Sep.
Oct.
Nov.
Dec.
18AQI (US)
17AQI (US)
23AQI (US)
29AQI (US)
35AQI (US)
20AQI (US)
33AQI (US)
32AQI (US)
17AQI (US)
41AQI (US)
40AQI (US)
16AQI (US)
32AQI (US)
15AQI (US)
30AQI (US)
46AQI (US)
44AQI (US)
30AQI (US)
53AQI (US)
35AQI (US)
16AQI (US)
24AQI (US)
30AQI (US)
29AQI (US)
44AQI (US)
27AQI (US)
39AQI (US)
18AQI (US)
20AQI (US)
37AQI (US)
39AQI (US)
36AQI (US)
43AQI (US)
29AQI (US)
44AQI (US)
54AQI (US)
47AQI (US)
14AQI (US)
17AQI (US)
34AQI (US)
38AQI (US)
50AQI (US)
22AQI (US)
40AQI (US)
62AQI (US)
68AQI (US)
44AQI (US)
21AQI (US)
33AQI (US)
31AQI (US)
32AQI (US)
43AQI (US)
43AQI (US)
42AQI (US)
45AQI (US)
41AQI (US)
9AQI (US)
27AQI (US)
42AQI (US)
37AQI (US)
67AQI (US)
44AQI (US)
57AQI (US)
58AQI (US)
54AQI (US)
48AQI (US)
43AQI (US)
54AQI (US)
58AQI (US)
61AQI (US)
67AQI (US)
40AQI (US)
35AQI (US)
13AQI (US)
29AQI (US)
56AQI (US)
62AQI (US)
40AQI (US)
34AQI (US)
54AQI (US)
56AQI (US)
57AQI (US)
53AQI (US)
64AQI (US)
27AQI (US)
21AQI (US)
48AQI (US)
59AQI (US)
57AQI (US)
34AQI (US)
18AQI (US)
21AQI (US)
47AQI (US)
53AQI (US)
32AQI (US)
25AQI (US)
45AQI (US)
24AQI (US)
36AQI (US)
50AQI (US)
40AQI (US)
31AQI (US)
33AQI (US)
41AQI (US)
41AQI (US)
35AQI (US)
35AQI (US)
33AQI (US)
34AQI (US)
35AQI (US)
40AQI (US)
47AQI (US)
36AQI (US)
32AQI (US)
46AQI (US)
51AQI (US)
49AQI (US)
42AQI (US)
40AQI (US)
40AQI (US)
48AQI (US)
52AQI (US)
45AQI (US)
29AQI (US)
22AQI (US)
30AQI (US)
31AQI (US)
28AQI (US)
25AQI (US)
30AQI (US)
30AQI (US)
37AQI (US)
39AQI (US)
34AQI (US)
36AQI (US)
85AQI (US)
68AQI (US)
53AQI (US)
48AQI (US)
61AQI (US)
60AQI (US)
61AQI (US)
54AQI (US)
58AQI (US)
48AQI (US)
40AQI (US)
25AQI (US)
25AQI (US)
24AQI (US)
30AQI (US)
35AQI (US)
34AQI (US)
30AQI (US)
23AQI (US)
23AQI (US)
21AQI (US)
20AQI (US)
21AQI (US)
20AQI (US)
23AQI (US)
22AQI (US)
24AQI (US)
24AQI (US)
27AQI (US)
38AQI (US)
19AQI (US)
21AQI (US)
24AQI (US)
25AQI (US)
28AQI (US)
22AQI (US)
20AQI (US)
19AQI (US)
22AQI (US)
22AQI (US)
26AQI (US)
29AQI (US)
26AQI (US)
27AQI (US)
27AQI (US)
25AQI (US)
25AQI (US)
21AQI (US)
16AQI (US)
40AQI (US)
27AQI (US)
31AQI (US)
26AQI (US)
25AQI (US)
24AQI (US)
25AQI (US)
28AQI (US)
28AQI (US)
30AQI (US)
42AQI (US)
37AQI (US)
47AQI (US)
43AQI (US)
25AQI (US)
19AQI (US)
28AQI (US)
50AQI (US)
63AQI (US)
51AQI (US)
39AQI (US)
30AQI (US)
26AQI (US)
25AQI (US)
32AQI (US)
30AQI (US)
27AQI (US)
42AQI (US)
45AQI (US)
39AQI (US)
21AQI (US)
26AQI (US)
30AQI (US)
24AQI (US)
24AQI (US)
23AQI (US)
24AQI (US)
24AQI (US)
26AQI (US)
24AQI (US)
22AQI (US)
16AQI (US)
23AQI (US)
30AQI (US)
38AQI (US)
48AQI (US)
38AQI (US)
42AQI (US)
24AQI (US)
32AQI (US)
26AQI (US)
No. of days
202635AQI (US)
Highest AQI (US) recorded in
March48AQI (US)
Lowest AQI (US) recorded in
June24AQI (US)
202544AQI (US)
Highest AQI (US) recorded in
October57AQI (US)
Lowest AQI (US) recorded in
February36AQI (US)
202444AQI (US)
Highest AQI (US) recorded in
April56AQI (US)
Lowest AQI (US) recorded in
December36AQI (US)
202346AQI (US)
Highest AQI (US) recorded in
April54AQI (US)
Lowest AQI (US) recorded in
August36AQI (US)
202245AQI (US)
Highest AQI (US) recorded in
August54AQI (US)
Lowest AQI (US) recorded in
December37AQI (US)
202144AQI (US)
Highest AQI (US) recorded in
March50AQI (US)
Lowest AQI (US) recorded in
August36AQI (US)
202041AQI (US)
Highest AQI (US) recorded in
November51AQI (US)
Lowest AQI (US) recorded in
September33AQI (US)
Most & Least Polluted Years Over the Last 7 Years
Nagano's annual 2026 AQI (US) (35) shows an average percentage change of -20.3% (improved AQI (US)) compared to previous years: 2020 (41), 2021 (44), 2022 (45), 2023 (46), 2024 (44), 2025 (44).