4 chome, Yokosuka, Kanagawa, 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
4 chome, Yokosuka, Kanagawa, Japan
AQI Trends: Highest and Lowest
Same Day Analysis (18th February):
On this day, AQI across the 1 years varied significantly: 2026 ranks 1st highest AQI at 28 of Good air quality on the same day.
Download 2024 Annual Data
World Air Quality Report

Day & Night AQI Trend: 17th Feb - 18th Feb 2026
4 chome, Yokosuka, Kanagawa, Japan
6 AM17th Feb 2026
5 PM
5 AM18th Feb 2026
21AQI
9AQI
29AQI
8AQI
In the last 24 hours,
4 chome's AQI reached its highest point of 29 at 5 AM during the Night, while the lowest point, 8, was recorded at 9 PM during the Night between 17th Feb and 18th Feb 2026.
Day & Night AQI Trend : Jan - Feb 2026
4 chome, Yokosuka, Kanagawa, Japan
9°C5/11°C
4°C3/6°C
5°C3/6°C
5°C4/8°C
8°C6/10°C
6°C4/7°C
5°C4/8°C
7°C4/8°C
7°C6/9°C
6°C4/8°C
5°C4/7°C
6°C4/8°C
7°C6/10°C
8°C7/10°C
8°C6/9°C
9°C7/10°C
10°C9/12°C
11°C10/14°C
4°C2/6°C
3°C2/3°C
5°C2/7°C
9°C6/12°C
11°C9/14°C
8°C7/8°C
9°C8/10°C
11°C9/13°C
14°C12/16°C
11°C7/12°C
6°C5/8°C
9°C7/11°C
47AQI
25AQI
41AQI
24AQI
2026 Days Vs Air Quality
4 chome, Yokosuka, Kanagawa, Japan
96%
47
4%
2
Total number of days with different AQI categories in last 50 days in 2026 (315 days remaining)
Under WHO’s Safe Air Quality Limits: 96%
Health Risk Level:
Very Low
In 2026, 96% of 50 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
4 chome, Yokosuka, Kanagawa, Japan
AQI levels in 2026
Jan.
Feb.
Mar.
Apr.
May
Jun.
Jul.
Aug.
Sep.
Oct.
Nov.
Dec.
21AQI (US)
14AQI (US)
13AQI (US)
14AQI (US)
26AQI (US)
19AQI (US)
23AQI (US)
22AQI (US)
13AQI (US)
20AQI (US)
22AQI (US)
14AQI (US)
20AQI (US)
22AQI (US)
23AQI (US)
41AQI (US)
52AQI (US)
27AQI (US)
36AQI (US)
28AQI (US)
14AQI (US)
20AQI (US)
32AQI (US)
31AQI (US)
35AQI (US)
19AQI (US)
34AQI (US)
26AQI (US)
23AQI (US)
32AQI (US)
31AQI (US)
29AQI (US)
42AQI (US)
28AQI (US)
29AQI (US)
51AQI (US)
44AQI (US)
11AQI (US)
12AQI (US)
30AQI (US)
34AQI (US)
40AQI (US)
34AQI (US)
43AQI (US)
46AQI (US)
34AQI (US)
38AQI (US)
15AQI (US)
28AQI (US)
25AQI (US)
33AQI (US)
No. of days
202628AQI (US)
Highest AQI (US) recorded in
February33AQI (US)
Lowest AQI (US) recorded in
January25AQI (US)
202537AQI (US)
Highest AQI (US) recorded in
August46AQI (US)
Lowest AQI (US) recorded in
May17AQI (US)
Most & Least Polluted Years Over the Last 2 Years
4 chome's annual 2026 AQI (US) (28) shows an average percentage change of -24.9% (improved AQI (US)) compared to previous years: 2025 (37).