Yokosuka, Kanagawa, Japan Historical Air Quality Analysis

Dive into detailed Air Quality Insights with historical data, monthly patterns, and yearly trends at your fingertips!

Good

050

Moderate

100

Poor

150

Unhealthy

200

Severe

300

Hazardous

301+

September Air Quality Analysis
Yokosuka, Kanagawa, Japan

2025

AQI

Days

Days	2025
Sep. 1	44
Sep. 2	37
Sep. 3	37
Sep. 4	39
Sep. 5	30
Sep. 6	28
Sep. 7	29
Sep. 8	36
Sep. 9	40
Sep. 10	36
Sep. 11	30
Sep. 12	31
Sep. 13	28
Sep. 14	36
Sep. 15	34
Sep. 16	34
Sep. 17	40
Sep. 18
Sep. 19
Sep. 20
Sep. 21
Sep. 22
Sep. 23
Sep. 24
Sep. 25
Sep. 26
Sep. 27
Sep. 28
Sep. 29
Sep. 30

AQI Trends: Highest and Lowest

Highest AQI recorded on

1st Sep 2025

44AQI

Lowest AQI recorded on

6th Sep 2025

28AQI

Same Day Analysis (17th September ):
On this day, AQI across the 1 years varied significantly: 2025 ranks 1st highest AQI at 40 of Good air quality on the same day.

Day & Night AQI Trend: 18th Sep - 19th Sep 2025
Yokosuka, Kanagawa, Japan

AQI

Day

Night

5 AM18th Sep 2025

6 PM

4 AM19th Sep 2025

Day time

Avg. Highest Time

12AMNaNth undefined

AQI

Avg. Lowest Time

12AMNaNth undefined

AQI

Night time

Avg. Highest Time

10AM18th Sep

72AQI

Avg. Lowest Time

9PM18th Sep

35AQI

In the last 24 hours,

Yokosuka's AQI reached its highest point of 72 at 10 AM during the Night, while the lowest point, 35, was recorded at 9 PM during the Night between 18th Sep and 19th Sep 2025.

Day & Night AQI Trend : Aug - Sep 2025
Yokosuka, Kanagawa, Japan

AugSep

20th - 21st21st - 22nd22nd - 23rd23rd - 24th24th - 25th25th - 26th26th - 27th27th - 28th28th - 29th29th - 30th30th - 31st31st - 01st01st - 02nd02nd - 03rd03rd - 04th04th - 05th05th - 06th06th - 07th07th - 08th08th - 09th09th - 10th10th - 11th11th - 12th12th - 13th13th - 14th14th - 15th15th - 16th16th - 17th17th - 18th18th - 19th19th

Day

Night

27°C26/28°C

27°C27/28°C

27°C27/29°C

27°C27/28°C

27°C26/28°C

27°C26/29°C

26°C26/27°C

28°C27/28°C

28°C27/29°C

27°C27/28°C

28°C27/28°C

26°C25/26°C

26°C22/27°C

26°C24/27°C

26°C26/27°C

27°C26/28°C

27°C27/28°C

27°C25/28°C

25°C24/27°C

26°C25/28°C

28°C27/28°C

27°C26/27°C

27°C26/28°C

--°C/°C

5 AM

11 AM

6 PM

11 PM

4 AM

--°C/°C

Day time

Avg. Highest Time

12 PM - 6 PM

46AQI

7 hours / Day

210 hours / Month

Avg. Lowest Time

9 AM

40AQI

1 hours / Day

30 hours / Month

In the last 30 days, during the daytime, the highest AQI was between 12 PM to 6 PM (Avg. 46), while the lowest AQI was between 9 AM to 9 AM (Avg. 40).

Night time

Avg. Highest Time

7 PM

44AQI

1 hours / Day

30 hours / Month

Avg. Lowest Time

10 PM - 11 PM

39AQI

2 hours / Day

60 hours / Month

In the last 30 days, during the daytime, the highest AQI was between 7 PM to 7 PM (Avg. 44), while the lowest AQI was between 10 PM to 11 PM (Avg. 39).

2025 Days Vs Air Quality
Yokosuka, Kanagawa, Japan

2025

87%

13%

Total number of days with different AQI categories in last 261 days in 2025 (104 days remaining)

Good

97 Days

Moderate

15 Days

Poor

0 Days

Unhealthy

0 Days

Severe

0 Days

Hazardous

0 Days

Under WHO’s Safe Air Quality Limits: 87%

Health Risk Level:

Low

In 2025, 87% of 261 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
Yokosuka, Kanagawa, Japan

AQI levels in 2025

AQI

PM2.5

PM10

SO2

NO2

Sun.Mon.Tue.Wed.Thu.Fri.Sat.

Jan.

Feb.

Mar.

Apr.

May

Jun.

Jul.

Aug.

Sep.

Oct.

Nov.

Dec.

17AQI

27AQI

42AQI

46AQI

35AQI

No. of days

Jan.Feb.Mar.Apr.MayJun.Jul.Aug.Sep.Oct.Nov.Dec.Total Days

202537AQI

Highest AQI recorded in

August

46AQI

Lowest AQI recorded in

May

17AQI

Most & Least Polluted Years Over the Last 1 Years

Most Polluted Year Recorded

2025(Avg.)

37AQI

Least Polluted Year Recorded

2025(Avg.)

37AQI

Yokosuka's annual 2025 AQI (37) shows an average percentage change of NaN% (improved AQI) compared to previous years: .


5 AM	38
6 AM	38
7 AM	38
8 AM	38
9 AM	64
10 AM	72
11 AM	72
12 PM	70
1 PM	60
2 PM	55
3 PM	60
4 PM	62
5 PM	61
6 PM	60
7 PM	56
8 PM	43
9 PM	35
10 PM	36
11 PM	38
12 AM	37
1 AM	39
2 AM	43
3 AM	43
4 AM	44

Yokosuka, Kanagawa, Japan Historical Air Quality Analysis

September Air Quality AnalysisYokosuka, Kanagawa, Japan

Day & Night AQI Trend: 18th Sep - 19th Sep 2025Yokosuka, Kanagawa, Japan

Day & Night AQI Trend : Aug - Sep 2025Yokosuka, Kanagawa, Japan

2025 Days Vs Air Quality Yokosuka, Kanagawa, Japan

Annual Air Quality InsightsYokosuka, Kanagawa, Japan

AQI levels in 2025

No. of days

September Air Quality Analysis
Yokosuka, Kanagawa, Japan

Day & Night AQI Trend: 18th Sep - 19th Sep 2025
Yokosuka, Kanagawa, Japan

Day & Night AQI Trend : Aug - Sep 2025
Yokosuka, Kanagawa, Japan

2025 Days Vs Air Quality
Yokosuka, Kanagawa, Japan

Annual Air Quality Insights
Yokosuka, Kanagawa, Japan