Oiwacho, Toyohashi, Aichi, 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
Oiwacho, Toyohashi, Aichi, Japan
AQI Trends: Highest and Lowest
Same Day Analysis (13th 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: 12th Feb - 13th Feb 2026
Oiwacho, Toyohashi, Aichi, Japan
6 AM12th Feb 2026
5 PM
5 AM13th Feb 2026
57AQI
38AQI
60AQI
49AQI
In the last 24 hours,
Oiwacho's AQI reached its highest point of 60 at 2 AM during the Night, while the lowest point, 38, was recorded at 3 PM during the Day between 12th Feb and 13th Feb 2026.
Day & Night AQI Trend : Jan - Feb 2026
Oiwacho, Toyohashi, Aichi, Japan
7°C3/10°C
10°C7/14°C
10°C6/14°C
9°C5/13°C
10°C5/14°C
8°C1/12°C
3°C0/6°C
3°C1/4°C
3°C0/6°C
5°C3/8°C
3°C1/6°C
3°C0/6°C
5°C2/10°C
5°C3/8°C
4°C2/7°C
3°C1/6°C
3°C1/7°C
5°C1/9°C
5°C2/9°C
5°C3/9°C
6°C2/10°C
8°C5/12°C
9°C6/13°C
6°C3/8°C
3°C0/5°C
3°C-1/8°C
6°C1/9°C
7°C6/9°C
7°C4/11°C
8°C4/12°C
46AQI
31AQI
44AQI
33AQI
2026 Days Vs Air Quality
Oiwacho, Toyohashi, Aichi, Japan
84%
37
16%
7
Total number of days with different AQI categories in last 45 days in 2026 (320 days remaining)
Under WHO’s Safe Air Quality Limits: 84%
Health Risk Level:
Low
In 2026, 84% of 45 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
Oiwacho, Toyohashi, Aichi, Japan
AQI levels in 2026
Jan.
Feb.
Mar.
Apr.
May
Jun.
Jul.
Aug.
Sep.
Oct.
Nov.
Dec.
19AQI (US)
14AQI (US)
15AQI (US)
23AQI (US)
47AQI (US)
14AQI (US)
25AQI (US)
38AQI (US)
12AQI (US)
26AQI (US)
28AQI (US)
23AQI (US)
38AQI (US)
25AQI (US)
35AQI (US)
58AQI (US)
54AQI (US)
52AQI (US)
56AQI (US)
29AQI (US)
13AQI (US)
22AQI (US)
37AQI (US)
50AQI (US)
18AQI (US)
12AQI (US)
37AQI (US)
30AQI (US)
25AQI (US)
36AQI (US)
33AQI (US)
34AQI (US)
43AQI (US)
32AQI (US)
36AQI (US)
57AQI (US)
56AQI (US)
15AQI (US)
16AQI (US)
34AQI (US)
37AQI (US)
46AQI (US)
46AQI (US)
56AQI (US)
30AQI (US)
39AQI (US)
No. of days
202633AQI (US)
Highest AQI (US) recorded in
February39AQI (US)
Lowest AQI (US) recorded in
January30AQI (US)
202535AQI (US)
Highest AQI (US) recorded in
August48AQI (US)
Lowest AQI (US) recorded in
June25AQI (US)
202431AQI (US)
Highest AQI (US) recorded in
April38AQI (US)
Lowest AQI (US) recorded in
February24AQI (US)
202329AQI (US)
Highest AQI (US) recorded in
April37AQI (US)
Lowest AQI (US) recorded in
August21AQI (US)
202230AQI (US)
Highest AQI (US) recorded in
May39AQI (US)
Lowest AQI (US) recorded in
October24AQI (US)
202124AQI (US)
Highest AQI (US) recorded in
June39AQI (US)
Lowest AQI (US) recorded in
January10AQI (US)
202014AQI (US)
Highest AQI (US) recorded in
July22AQI (US)
Lowest AQI (US) recorded in
September8AQI (US)
Most & Least Polluted Years Over the Last 7 Years
Oiwacho's annual 2026 AQI (US) (33) shows an average percentage change of 31.9% (worsened AQI (US)) compared to previous years: 2020 (14), 2021 (24), 2022 (30), 2023 (29), 2024 (31), 2025 (35).