Itoigawa, Niigata, Japan Historical Air Quality Analysis
Dive into detailed Air Quality Insights with historical data, monthly patterns, and yearly trends at your fingertips!
March Air Quality Analysis
Itoigawa, Niigata, Japan
AQI Trends: Highest and Lowest
Same Day Analysis (12th March):
On this day, AQI across the 5 years varied significantly: 2026 ranks 2nd highest AQI at 63 of Moderate air quality, showing improvement over 2022 on the same day.
Download 2024 Annual Data
World Air Quality Report

Day & Night AQI Trend: 11th Mar - 12th Mar 2026
Itoigawa, Niigata, Japan
6 AM11th Mar 2026
5 PM
5 AM12th Mar 2026
86AQI
31AQI
82AQI
12AQI
In the last 24 hours,
Itoigawa's AQI reached its highest point of 86 at 1 PM during the Day, while the lowest point, 12, was recorded at 9 PM during the Night between 11th Mar and 12th Mar 2026.
Day & Night AQI Trend : Feb - Mar 2026
Itoigawa, Niigata, Japan
4°C1/5°C
2°C-1/5°C
4°C1/8°C
6°C1/11°C
8°C4/13°C
4°C2/4°C
2°C1/4°C
3°C0/9°C
0°C-2/3°C
1°C-3/5°C
5°C1/11°C
8°C4/15°C
8°C6/8°C
7°C3/11°C
7°C6/9°C
9°C6/12°C
10°C7/12°C
8°C6/9°C
6°C5/8°C
6°C3/8°C
8°C6/10°C
5°C4/7°C
4°C2/6°C
6°C1/13°C
5°C3/6°C
3°C1/5°C
3°C0/5°C
3°C0/4°C
1°C-2/4°C
2°C-2/5°C
60AQI
37AQI
53AQI
35AQI
2026 Days Vs Air Quality
Itoigawa, Niigata, Japan
89%
63
11%
8
Total number of days with different AQI categories in last 72 days in 2026 (293 days remaining)
Under WHO’s Safe Air Quality Limits: 89%
Health Risk Level:
Low
In 2026, 89% of 72 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
Itoigawa, Niigata, Japan
AQI levels in 2026
Jan.
Feb.
Mar.
Apr.
May
Jun.
Jul.
Aug.
Sep.
Oct.
Nov.
Dec.
22AQI (US)
31AQI (US)
34AQI (US)
31AQI (US)
34AQI (US)
25AQI (US)
23AQI (US)
26AQI (US)
28AQI (US)
29AQI (US)
27AQI (US)
28AQI (US)
31AQI (US)
27AQI (US)
46AQI (US)
50AQI (US)
45AQI (US)
34AQI (US)
49AQI (US)
32AQI (US)
19AQI (US)
25AQI (US)
34AQI (US)
35AQI (US)
42AQI (US)
27AQI (US)
36AQI (US)
32AQI (US)
27AQI (US)
39AQI (US)
43AQI (US)
34AQI (US)
42AQI (US)
32AQI (US)
38AQI (US)
41AQI (US)
38AQI (US)
20AQI (US)
10AQI (US)
33AQI (US)
41AQI (US)
48AQI (US)
41AQI (US)
47AQI (US)
61AQI (US)
55AQI (US)
43AQI (US)
17AQI (US)
32AQI (US)
29AQI (US)
35AQI (US)
42AQI (US)
36AQI (US)
42AQI (US)
34AQI (US)
37AQI (US)
27AQI (US)
43AQI (US)
36AQI (US)
39AQI (US)
66AQI (US)
43AQI (US)
47AQI (US)
62AQI (US)
56AQI (US)
45AQI (US)
44AQI (US)
46AQI (US)
55AQI (US)
56AQI (US)
63AQI (US)
33AQI (US)
37AQI (US)
52AQI (US)
No. of days
202638AQI (US)
Highest AQI (US) recorded in
March52AQI (US)
Lowest AQI (US) recorded in
January33AQI (US)
202541AQI (US)
Highest AQI (US) recorded in
October50AQI (US)
Lowest AQI (US) recorded in
September29AQI (US)
202437AQI (US)
Highest AQI (US) recorded in
April51AQI (US)
Lowest AQI (US) recorded in
December27AQI (US)
202338AQI (US)
Highest AQI (US) recorded in
April48AQI (US)
Lowest AQI (US) recorded in
January30AQI (US)
202237AQI (US)
Highest AQI (US) recorded in
May47AQI (US)
Lowest AQI (US) recorded in
December27AQI (US)
202134AQI (US)
Highest AQI (US) recorded in
June49AQI (US)
Lowest AQI (US) recorded in
January24AQI (US)
202030AQI (US)
Highest AQI (US) recorded in
August55AQI (US)
Lowest AQI (US) recorded in
December19AQI (US)
Most & Least Polluted Years Over the Last 7 Years
Itoigawa's annual 2026 AQI (US) (38) shows an average percentage change of 4.7% (worsened AQI (US)) compared to previous years: 2020 (30), 2021 (34), 2022 (37), 2023 (38), 2024 (37), 2025 (41).