Yachiyo, Chiba, 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
Yachiyo, Chiba, 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 67 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
Yachiyo, Chiba, Japan
6 AM11th Mar 2026
5 PM
5 AM12th Mar 2026
82AQI
36AQI
84AQI
13AQI
In the last 24 hours,
Yachiyo's AQI reached its highest point of 84 at 3 AM during the Night, while the lowest point, 13, was recorded at 10 PM during the Night between 11th Mar and 12th Mar 2026.
Day & Night AQI Trend : Feb - Mar 2026
Yachiyo, Chiba, Japan
7°C5/8°C
7°C5/9°C
7°C5/9°C
10°C6/14°C
13°C9/15°C
10°C4/11°C
6°C3/9°C
8°C6/10°C
6°C3/9°C
8°C5/10°C
10°C7/14°C
13°C9/15°C
15°C13/18°C
12°C10/14°C
11°C7/14°C
9°C6/13°C
11°C9/13°C
13°C11/17°C
12°C9/15°C
11°C11/12°C
9°C7/10°C
8°C4/13°C
10°C7/14°C
10°C8/13°C
13°C8/16°C
8°C6/11°C
8°C6/10°C
6°C4/9°C
7°C4/10°C
8°C5/11°C
60AQI
36AQI
47AQI
35AQI
2026 Days Vs Air Quality
Yachiyo, Chiba, Japan
83%
59
17%
12
Total number of days with different AQI categories in last 72 days in 2026 (293 days remaining)
Under WHO’s Safe Air Quality Limits: 83%
Health Risk Level:
Low
In 2026, 83% 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
Yachiyo, Chiba, Japan
AQI levels in 2026
Jan.
Feb.
Mar.
Apr.
May
Jun.
Jul.
Aug.
Sep.
Oct.
Nov.
Dec.
16AQI (US)
25AQI (US)
18AQI (US)
25AQI (US)
50AQI (US)
19AQI (US)
33AQI (US)
42AQI (US)
18AQI (US)
36AQI (US)
33AQI (US)
23AQI (US)
41AQI (US)
14AQI (US)
34AQI (US)
49AQI (US)
52AQI (US)
34AQI (US)
46AQI (US)
50AQI (US)
20AQI (US)
31AQI (US)
40AQI (US)
38AQI (US)
24AQI (US)
20AQI (US)
37AQI (US)
34AQI (US)
17AQI (US)
23AQI (US)
36AQI (US)
36AQI (US)
39AQI (US)
27AQI (US)
40AQI (US)
62AQI (US)
64AQI (US)
13AQI (US)
10AQI (US)
33AQI (US)
37AQI (US)
50AQI (US)
31AQI (US)
44AQI (US)
55AQI (US)
57AQI (US)
52AQI (US)
16AQI (US)
31AQI (US)
25AQI (US)
28AQI (US)
42AQI (US)
47AQI (US)
30AQI (US)
34AQI (US)
28AQI (US)
20AQI (US)
43AQI (US)
44AQI (US)
33AQI (US)
73AQI (US)
43AQI (US)
56AQI (US)
55AQI (US)
49AQI (US)
45AQI (US)
41AQI (US)
49AQI (US)
58AQI (US)
57AQI (US)
67AQI (US)
32AQI (US)
37AQI (US)
52AQI (US)
No. of days
202637AQI (US)
Highest AQI (US) recorded in
March52AQI (US)
Lowest AQI (US) recorded in
January32AQI (US)
202541AQI (US)
Highest AQI (US) recorded in
October49AQI (US)
Lowest AQI (US) recorded in
May32AQI (US)
202438AQI (US)
Highest AQI (US) recorded in
July49AQI (US)
Lowest AQI (US) recorded in
August30AQI (US)
202339AQI (US)
Highest AQI (US) recorded in
April46AQI (US)
Lowest AQI (US) recorded in
August27AQI (US)
202239AQI (US)
Highest AQI (US) recorded in
March45AQI (US)
Lowest AQI (US) recorded in
August25AQI (US)
202138AQI (US)
Highest AQI (US) recorded in
December47AQI (US)
Lowest AQI (US) recorded in
July32AQI (US)
202038AQI (US)
Highest AQI (US) recorded in
December47AQI (US)
Lowest AQI (US) recorded in
September29AQI (US)
Most & Least Polluted Years Over the Last 7 Years
Yachiyo's annual 2026 AQI (US) (37) shows an average percentage change of -4.2% (improved AQI (US)) compared to previous years: 2020 (38), 2021 (38), 2022 (39), 2023 (39), 2024 (38), 2025 (41).