Katsuura, 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
Katsuura, Chiba, Japan
AQI Trends: Highest and Lowest
Same Day Analysis (10th March):
On this day, AQI across the 3 years varied significantly: 2026 ranks 1st highest AQI at 58 of Moderate air quality on the same day.
Download 2024 Annual Data
World Air Quality Report

Day & Night AQI Trend: 9th Mar - 10th Mar 2026
Katsuura, Chiba, Japan
6 AM9th Mar 2026
5 PM
5 AM10th Mar 2026
66AQI
32AQI
76AQI
30AQI
In the last 24 hours,
Katsuura's AQI reached its highest point of 76 at 1 AM during the Night, while the lowest point, 30, was recorded at 10 PM during the Night between 9th Mar and 10th Mar 2026.
Day & Night AQI Trend : Feb - Mar 2026
Katsuura, Chiba, Japan
4°C0/7°C
9°C6/12°C
12°C9/15°C
7°C6/8°C
8°C7/9°C
11°C8/14°C
15°C13/16°C
11°C8/13°C
7°C6/8°C
9°C6/11°C
6°C3/8°C
8°C5/10°C
10°C8/14°C
13°C9/15°C
16°C14/18°C
14°C12/15°C
14°C10/17°C
10°C9/11°C
11°C10/13°C
13°C11/16°C
12°C9/14°C
13°C12/13°C
12°C11/12°C
9°C6/12°C
10°C8/13°C
12°C10/15°C
13°C8/16°C
7°C4/10°C
8°C7/10°C
7°C6/8°C
58AQI
37AQI
45AQI
38AQI
2026 Days Vs Air Quality
Katsuura, Chiba, Japan
87%
60
13%
9
Total number of days with different AQI categories in last 70 days in 2026 (295 days remaining)
Under WHO’s Safe Air Quality Limits: 87%
Health Risk Level:
Low
In 2026, 87% of 70 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
Katsuura, Chiba, Japan
AQI levels in 2026
Jan.
Feb.
Mar.
Apr.
May
Jun.
Jul.
Aug.
Sep.
Oct.
Nov.
Dec.
20AQI (US)
20AQI (US)
21AQI (US)
27AQI (US)
39AQI (US)
31AQI (US)
33AQI (US)
41AQI (US)
14AQI (US)
32AQI (US)
27AQI (US)
18AQI (US)
34AQI (US)
17AQI (US)
35AQI (US)
44AQI (US)
40AQI (US)
31AQI (US)
33AQI (US)
36AQI (US)
16AQI (US)
26AQI (US)
43AQI (US)
34AQI (US)
42AQI (US)
29AQI (US)
46AQI (US)
25AQI (US)
19AQI (US)
34AQI (US)
34AQI (US)
39AQI (US)
49AQI (US)
31AQI (US)
36AQI (US)
57AQI (US)
48AQI (US)
17AQI (US)
15AQI (US)
39AQI (US)
39AQI (US)
35AQI (US)
26AQI (US)
40AQI (US)
63AQI (US)
43AQI (US)
51AQI (US)
25AQI (US)
34AQI (US)
18AQI (US)
27AQI (US)
55AQI (US)
37AQI (US)
34AQI (US)
34AQI (US)
23AQI (US)
13AQI (US)
44AQI (US)
46AQI (US)
48AQI (US)
79AQI (US)
46AQI (US)
60AQI (US)
55AQI (US)
51AQI (US)
46AQI (US)
43AQI (US)
50AQI (US)
58AQI (US)
30AQI (US)
36AQI (US)
54AQI (US)
No. of days
202636AQI (US)
Highest AQI (US) recorded in
March54AQI (US)
Lowest AQI (US) recorded in
January30AQI (US)
202539AQI (US)
Highest AQI (US) recorded in
October48AQI (US)
Lowest AQI (US) recorded in
May30AQI (US)
202433AQI (US)
Highest AQI (US) recorded in
July43AQI (US)
Lowest AQI (US) recorded in
March18AQI (US)
202338AQI (US)
Highest AQI (US) recorded in
December40AQI (US)
Lowest AQI (US) recorded in
November25AQI (US)
202130AQI (US)
Highest AQI (US) recorded in
May38AQI (US)
Lowest AQI (US) recorded in
February26AQI (US)
202026AQI (US)
Highest AQI (US) recorded in
August32AQI (US)
Lowest AQI (US) recorded in
September22AQI (US)
Most & Least Polluted Years Over the Last 6 Years
Katsuura's annual 2026 AQI (US) (36) shows an average percentage change of 11.1% (worsened AQI (US)) compared to previous years: 2020 (26), 2021 (30), 2023 (38), 2024 (33), 2025 (39).