Iida, Nagano, Japan Historical Air Quality Analysis
Dive into detailed Air Quality Insights with historical data, monthly patterns, and yearly trends at your fingertips!
June Air Quality Analysis
Iida, Nagano, Japan
AQI Trends: Highest and Lowest
Same Day Analysis (3rd June):
On this day, AQI across the 3 years varied significantly: 2026 ranks 2nd highest AQI at 24 of Good air quality, showing improvement over 2024 on the same day.
Download 2024 Annual Data
World Air Quality Report

Day & Night AQI Trend: 2nd Jun - 3rd Jun 2026
Iida, Nagano, Japan
4 AM2nd Jun 2026
6 PM
3 AM3rd Jun 2026
42AQI
26AQI
30AQI
16AQI
In the last 24 hours,
Iida's AQI reached its highest point of 42 at 11 AM during the Day, while the lowest point, 16, was recorded at 2 AM during the Night between 2nd Jun and 3rd Jun 2026.
Day & Night AQI Trend : May - Jun 2026
Iida, Nagano, Japan
8°C-2/18°C
10°C1/18°C
14°C5/24°C
13°C0/22°C
7°C-2/17°C
9°C-2/20°C
11°C1/21°C
14°C8/21°C
12°C5/19°C
12°C3/22°C
13°C3/24°C
15°C6/24°C
16°C5/27°C
16°C7/27°C
17°C8/27°C
16°C7/26°C
18°C13/19°C
18°C15/22°C
16°C14/18°C
15°C9/22°C
17°C8/26°C
17°C10/24°C
18°C9/25°C
20°C9/28°C
19°C7/27°C
15°C5/25°C
16°C8/25°C
17°C7/27°C
13°C9/21°C
15°C11/23°C
46AQI
36AQI
43AQI
36AQI
2026 Days Vs Air Quality
Iida, Nagano, Japan
85%
131
15%
23
Total number of days with different AQI categories in last 154 days in 2026 (211 days remaining)
Under WHO’s Safe Air Quality Limits: 85%
Health Risk Level:
Low
In 2026, 85% of 154 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
Iida, Nagano, Japan
AQI levels in 2026
Jan.
Feb.
Mar.
Apr.
May
Jun.
Jul.
Aug.
Sep.
Oct.
Nov.
Dec.
22AQI (US)
20AQI (US)
17AQI (US)
24AQI (US)
36AQI (US)
22AQI (US)
26AQI (US)
28AQI (US)
21AQI (US)
34AQI (US)
29AQI (US)
19AQI (US)
23AQI (US)
16AQI (US)
34AQI (US)
37AQI (US)
47AQI (US)
43AQI (US)
52AQI (US)
34AQI (US)
16AQI (US)
21AQI (US)
32AQI (US)
39AQI (US)
42AQI (US)
23AQI (US)
34AQI (US)
27AQI (US)
20AQI (US)
32AQI (US)
32AQI (US)
30AQI (US)
41AQI (US)
30AQI (US)
32AQI (US)
31AQI (US)
37AQI (US)
19AQI (US)
21AQI (US)
32AQI (US)
34AQI (US)
39AQI (US)
36AQI (US)
46AQI (US)
51AQI (US)
52AQI (US)
43AQI (US)
20AQI (US)
20AQI (US)
29AQI (US)
30AQI (US)
41AQI (US)
41AQI (US)
43AQI (US)
50AQI (US)
27AQI (US)
19AQI (US)
44AQI (US)
44AQI (US)
24AQI (US)
67AQI (US)
40AQI (US)
11AQI (US)
50AQI (US)
53AQI (US)
44AQI (US)
42AQI (US)
47AQI (US)
58AQI (US)
56AQI (US)
63AQI (US)
40AQI (US)
46AQI (US)
59AQI (US)
56AQI (US)
50AQI (US)
54AQI (US)
34AQI (US)
35AQI (US)
46AQI (US)
44AQI (US)
33AQI (US)
47AQI (US)
45AQI (US)
10AQI (US)
25AQI (US)
60AQI (US)
60AQI (US)
46AQI (US)
15AQI (US)
20AQI (US)
38AQI (US)
46AQI (US)
44AQI (US)
33AQI (US)
29AQI (US)
31AQI (US)
25AQI (US)
29AQI (US)
44AQI (US)
35AQI (US)
30AQI (US)
31AQI (US)
40AQI (US)
36AQI (US)
33AQI (US)
36AQI (US)
32AQI (US)
31AQI (US)
37AQI (US)
39AQI (US)
45AQI (US)
36AQI (US)
29AQI (US)
46AQI (US)
52AQI (US)
49AQI (US)
43AQI (US)
40AQI (US)
36AQI (US)
46AQI (US)
51AQI (US)
43AQI (US)
23AQI (US)
23AQI (US)
28AQI (US)
29AQI (US)
28AQI (US)
26AQI (US)
27AQI (US)
29AQI (US)
33AQI (US)
39AQI (US)
32AQI (US)
39AQI (US)
85AQI (US)
68AQI (US)
54AQI (US)
49AQI (US)
62AQI (US)
60AQI (US)
61AQI (US)
55AQI (US)
59AQI (US)
49AQI (US)
41AQI (US)
25AQI (US)
25AQI (US)
24AQI (US)
23AQI (US)
25AQI (US)
28AQI (US)
30AQI (US)
24AQI (US)
29AQI (US)
35AQI (US)
44AQI (US)
37AQI (US)
41AQI (US)
27AQI (US)
No. of days
202637AQI (US)
Highest AQI (US) recorded in
March44AQI (US)
Lowest AQI (US) recorded in
June27AQI (US)
202539AQI (US)
Highest AQI (US) recorded in
July46AQI (US)
Lowest AQI (US) recorded in
April25AQI (US)
202434AQI (US)
Highest AQI (US) recorded in
June42AQI (US)
Lowest AQI (US) recorded in
January16AQI (US)
202317AQI (US)
Highest AQI (US) recorded in
December18AQI (US)
Lowest AQI (US) recorded in
November16AQI (US)
202027AQI (US)
Highest AQI (US) recorded in
April30AQI (US)
Lowest AQI (US) recorded in
May8AQI (US)
Most & Least Polluted Years Over the Last 5 Years
Iida's annual 2026 AQI (US) (37) shows an average percentage change of 39.5% (worsened AQI (US)) compared to previous years: 2020 (27), 2023 (17), 2024 (34), 2025 (39).