Shimadachi, Minamiozuma, Nagano, Japan Historical Air Quality Analysis
Dive into detailed Air Quality Insights with historical data, monthly patterns, and yearly trends at your fingertips!
February Air Quality Analysis
Shimadachi, Minamiozuma, Nagano, Japan
AQI Trends: Highest and Lowest
Same Day Analysis (15th February):
On this day, AQI across the 5 years varied significantly: 2026 ranks 1st highest AQI at 56 of Moderate air quality on the same day.
Download 2024 Annual Data
World Air Quality Report

Day & Night AQI Trend: 14th Feb - 15th Feb 2026
Shimadachi, Minamiozuma, Nagano, Japan
6 AM14th Feb 2026
5 PM
5 AM15th Feb 2026
81AQI
39AQI
102AQI
41AQI
In the last 24 hours,
Shimadachi's AQI reached its highest point of 102 at 5 AM during the Night, while the lowest point, 39, was recorded at 4 PM during the Day between 14th Feb and 15th Feb 2026.
Day & Night AQI Trend : Jan - Feb 2026
Shimadachi, Minamiozuma, Nagano, Japan
1°C-5/10°C
-1°C-4/4°C
1°C-5/11°C
-2°C-7/4°C
-5°C-7/-1°C
-6°C-9/-2°C
-5°C-12/1°C
-3°C-6/1°C
-5°C-7/-1°C
-5°C-10/0°C
-2°C-9/7°C
-3°C-5/1°C
-4°C-8/1°C
-4°C-9/0°C
-5°C-8/1°C
-2°C-7/4°C
-2°C-6/4°C
-3°C-7/2°C
-1°C-7/8°C
1°C-5/9°C
1°C-3/10°C
-3°C-4/-2°C
-8°C-16/-4°C
-8°C-15/1°C
-2°C-10/10°C
0°C-4/3°C
-5°C-10/2°C
-3°C-9/6°C
0°C-7/11°C
4°C-3/15°C
44AQI
30AQI
44AQI
32AQI
2026 Days Vs Air Quality
Shimadachi, Minamiozuma, Nagano, Japan
89%
41
11%
5
Total number of days with different AQI categories in last 47 days in 2026 (318 days remaining)
Under WHO’s Safe Air Quality Limits: 89%
Health Risk Level:
Low
In 2026, 89% of 47 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
Shimadachi, Minamiozuma, Nagano, Japan
AQI levels in 2026
Jan.
Feb.
Mar.
Apr.
May
Jun.
Jul.
Aug.
Sep.
Oct.
Nov.
Dec.
22AQI (US)
20AQI (US)
31AQI (US)
33AQI (US)
30AQI (US)
23AQI (US)
36AQI (US)
27AQI (US)
27AQI (US)
43AQI (US)
31AQI (US)
19AQI (US)
25AQI (US)
12AQI (US)
37AQI (US)
42AQI (US)
53AQI (US)
31AQI (US)
54AQI (US)
31AQI (US)
25AQI (US)
21AQI (US)
27AQI (US)
38AQI (US)
40AQI (US)
24AQI (US)
40AQI (US)
27AQI (US)
29AQI (US)
41AQI (US)
20AQI (US)
31AQI (US)
42AQI (US)
29AQI (US)
28AQI (US)
49AQI (US)
49AQI (US)
12AQI (US)
10AQI (US)
30AQI (US)
35AQI (US)
39AQI (US)
48AQI (US)
64AQI (US)
58AQI (US)
56AQI (US)
31AQI (US)
39AQI (US)
No. of days
202633AQI (US)
Highest AQI (US) recorded in
February39AQI (US)
Lowest AQI (US) recorded in
January31AQI (US)
202541AQI (US)
Highest AQI (US) recorded in
August47AQI (US)
Lowest AQI (US) recorded in
September35AQI (US)
202434AQI (US)
Highest AQI (US) recorded in
April46AQI (US)
Lowest AQI (US) recorded in
July27AQI (US)
202335AQI (US)
Highest AQI (US) recorded in
April44AQI (US)
Lowest AQI (US) recorded in
October26AQI (US)
202238AQI (US)
Highest AQI (US) recorded in
April46AQI (US)
Lowest AQI (US) recorded in
August20AQI (US)
202133AQI (US)
Highest AQI (US) recorded in
June41AQI (US)
Lowest AQI (US) recorded in
August27AQI (US)
202031AQI (US)
Highest AQI (US) recorded in
August47AQI (US)
Lowest AQI (US) recorded in
July22AQI (US)
Most & Least Polluted Years Over the Last 7 Years
Shimadachi's annual 2026 AQI (US) (33) shows an average percentage change of -4.4% (improved AQI (US)) compared to previous years: 2020 (31), 2021 (33), 2022 (38), 2023 (35), 2024 (34), 2025 (41).