Kohokudai, Abiko, 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
Kohokudai, Abiko, Chiba, Japan
AQI Trends: Highest and Lowest
Same Day Analysis (6th February):
On this day, AQI across the 5 years varied significantly: 2026 ranks 1st highest AQI at 60 of Moderate air quality on the same day.
Download 2024 Annual Data
World Air Quality Report

Day & Night AQI Trend: 5th Feb - 6th Feb 2026
Kohokudai, Abiko, Chiba, Japan
6 AM5th Feb 2026
4 PM
5 AM6th Feb 2026
79AQI
42AQI
82AQI
54AQI
In the last 24 hours,
Kohokudai's AQI reached its highest point of 82 at 1 AM during the Night, while the lowest point, 42, was recorded at 2 PM during the Day between 5th Feb and 6th Feb 2026.
Day & Night AQI Trend : Jan - Feb 2026
Kohokudai, Abiko, Chiba, Japan
6°C3/10°C
5°C2/8°C
10°C5/14°C
10°C4/12°C
5°C2/7°C
9°C4/14°C
8°C6/10°C
8°C4/10°C
11°C7/15°C
10°C8/14°C
8°C6/9°C
7°C6/8°C
7°C3/11°C
4°C2/6°C
3°C1/5°C
4°C1/7°C
6°C2/10°C
4°C1/6°C
4°C1/7°C
5°C2/8°C
6°C3/8°C
4°C2/7°C
4°C2/7°C
5°C2/7°C
6°C3/9°C
6°C4/10°C
6°C3/9°C
7°C4/10°C
9°C5/12°C
10°C6/14°C
43AQI
26AQI
39AQI
29AQI
2026 Days Vs Air Quality
Kohokudai, Abiko, Chiba, Japan
95%
35
5%
2
Total number of days with different AQI categories in last 38 days in 2026 (327 days remaining)
Under WHO’s Safe Air Quality Limits: 95%
Health Risk Level:
Very Low
In 2026, 95% of 38 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
Kohokudai, Abiko, Chiba, Japan
AQI levels in 2026
Jan.
Feb.
Mar.
Apr.
May
Jun.
Jul.
Aug.
Sep.
Oct.
Nov.
Dec.
12AQI (US)
23AQI (US)
18AQI (US)
24AQI (US)
44AQI (US)
15AQI (US)
34AQI (US)
36AQI (US)
14AQI (US)
30AQI (US)
30AQI (US)
20AQI (US)
40AQI (US)
12AQI (US)
28AQI (US)
46AQI (US)
50AQI (US)
28AQI (US)
43AQI (US)
40AQI (US)
12AQI (US)
23AQI (US)
37AQI (US)
37AQI (US)
15AQI (US)
17AQI (US)
40AQI (US)
31AQI (US)
17AQI (US)
25AQI (US)
39AQI (US)
41AQI (US)
44AQI (US)
30AQI (US)
42AQI (US)
62AQI (US)
60AQI (US)
28AQI (US)
47AQI (US)
No. of days
202631AQI (US)
Highest AQI (US) recorded in
February47AQI (US)
Lowest AQI (US) recorded in
January28AQI (US)
202540AQI (US)
Highest AQI (US) recorded in
December49AQI (US)
Lowest AQI (US) recorded in
May33AQI (US)
202437AQI (US)
Highest AQI (US) recorded in
July46AQI (US)
Lowest AQI (US) recorded in
August28AQI (US)
202338AQI (US)
Highest AQI (US) recorded in
December46AQI (US)
Lowest AQI (US) recorded in
August24AQI (US)
202241AQI (US)
Highest AQI (US) recorded in
February52AQI (US)
Lowest AQI (US) recorded in
August25AQI (US)
202144AQI (US)
Highest AQI (US) recorded in
December53AQI (US)
Lowest AQI (US) recorded in
August36AQI (US)
202041AQI (US)
Highest AQI (US) recorded in
November52AQI (US)
Lowest AQI (US) recorded in
September28AQI (US)
Most & Least Polluted Years Over the Last 7 Years
Kohokudai's annual 2026 AQI (US) (31) shows an average percentage change of -21.9% (improved AQI (US)) compared to previous years: 2020 (41), 2021 (44), 2022 (41), 2023 (38), 2024 (37), 2025 (40).