Tsuiheiji, Ichihara, Chiba, 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
Tsuiheiji, Ichihara, Chiba, Japan
AQI Trends: Highest and Lowest
Same Day Analysis (10th February):
On this day, AQI across the 5 years varied significantly: 2026 ranks 4th highest AQI at 35 of Good air quality, showing improvement over 2024, 2023 and 2022 on the same day.
Download 2024 Annual Data
World Air Quality Report

Day & Night AQI Trend: 9th Feb - 10th Feb 2026
Tsuiheiji, Ichihara, Chiba, Japan
6 AM9th Feb 2026
5 PM
5 AM10th Feb 2026
78AQI
24AQI
60AQI
14AQI
In the last 24 hours,
Tsuiheiji's AQI reached its highest point of 78 at 10 AM during the Day, while the lowest point, 14, was recorded at 10 PM during the Night between 9th Feb and 10th Feb 2026.
Day & Night AQI Trend : Jan - Feb 2026
Tsuiheiji, Ichihara, Chiba, Japan
5°C3/7°C
11°C7/14°C
8°C7/10°C
9°C6/12°C
13°C10/15°C
11°C9/13°C
9°C8/9°C
8°C6/10°C
8°C4/11°C
3°C2/5°C
4°C2/5°C
4°C2/7°C
7°C4/10°C
5°C3/7°C
5°C2/7°C
6°C3/8°C
6°C4/8°C
4°C2/7°C
5°C3/7°C
5°C3/7°C
7°C5/8°C
7°C5/9°C
7°C4/9°C
8°C6/9°C
9°C7/11°C
10°C8/13°C
4°C2/6°C
2°C0/2°C
3°C0/7°C
7°C4/12°C
43AQI
30AQI
39AQI
27AQI
2026 Days Vs Air Quality
Tsuiheiji, Ichihara, Chiba, Japan
93%
38
7%
3
Total number of days with different AQI categories in last 42 days in 2026 (323 days remaining)
Under WHO’s Safe Air Quality Limits: 93%
Health Risk Level:
Very Low
In 2026, 93% of 42 days were within WHO’s safe air quality limits. The risk of health issues is Very Low, but health impacts are still unclear.
Annual Air Quality Insights
Tsuiheiji, Ichihara, Chiba, Japan
AQI levels in 2026
Jan.
Feb.
Mar.
Apr.
May
Jun.
Jul.
Aug.
Sep.
Oct.
Nov.
Dec.
24AQI (US)
22AQI (US)
17AQI (US)
29AQI (US)
37AQI (US)
18AQI (US)
33AQI (US)
43AQI (US)
18AQI (US)
40AQI (US)
33AQI (US)
21AQI (US)
31AQI (US)
17AQI (US)
28AQI (US)
45AQI (US)
51AQI (US)
28AQI (US)
38AQI (US)
34AQI (US)
13AQI (US)
24AQI (US)
37AQI (US)
32AQI (US)
43AQI (US)
26AQI (US)
43AQI (US)
30AQI (US)
18AQI (US)
37AQI (US)
40AQI (US)
40AQI (US)
36AQI (US)
17AQI (US)
39AQI (US)
63AQI (US)
56AQI (US)
13AQI (US)
14AQI (US)
35AQI (US)
35AQI (US)
31AQI (US)
35AQI (US)
No. of days
202632AQI (US)
Highest AQI (US) recorded in
February35AQI (US)
Lowest AQI (US) recorded in
January31AQI (US)
202540AQI (US)
Highest AQI (US) recorded in
October50AQI (US)
Lowest AQI (US) recorded in
June32AQI (US)
202438AQI (US)
Highest AQI (US) recorded in
July52AQI (US)
Lowest AQI (US) recorded in
October31AQI (US)
202340AQI (US)
Highest AQI (US) recorded in
April47AQI (US)
Lowest AQI (US) recorded in
August26AQI (US)
202250AQI (US)
Highest AQI (US) recorded in
March103AQI (US)
Lowest AQI (US) recorded in
August17AQI (US)
202139AQI (US)
Highest AQI (US) recorded in
May44AQI (US)
Lowest AQI (US) recorded in
April35AQI (US)
202035AQI (US)
Highest AQI (US) recorded in
August41AQI (US)
Lowest AQI (US) recorded in
April28AQI (US)
Most & Least Polluted Years Over the Last 7 Years
Tsuiheiji's annual 2026 AQI (US) (32) shows an average percentage change of -20.9% (improved AQI (US)) compared to previous years: 2020 (35), 2021 (39), 2022 (50), 2023 (40), 2024 (38), 2025 (40).