Daiku, Okayama, Okayama, 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
Daiku, Okayama, Okayama, Japan

2024

2025

AQI

Days

Days	2025	2024
Sep. 1	46	30
Sep. 2	39	38
Sep. 3	42	42
Sep. 4	30	39
Sep. 5	25
Sep. 6	26	100
Sep. 7		81
Sep. 8		70
Sep. 9		55
Sep. 10		35
Sep. 11		33
Sep. 12		41
Sep. 13		37
Sep. 14		28
Sep. 15		28
Sep. 16		35
Sep. 17		34
Sep. 18		45
Sep. 19		57
Sep. 20		50
Sep. 21		42
Sep. 22		32
Sep. 23		30
Sep. 24		35
Sep. 25		52
Sep. 26		58
Sep. 27		51
Sep. 28		36
Sep. 29		39
Sep. 30		43

AQI Trends: Highest and Lowest

Highest AQI recorded on

6th Sep 2024

100AQI

Lowest AQI recorded on

5th Sep 2025

25AQI

Same Day Analysis (6th September ):
On this day, AQI across the 2 years varied significantly: 2025 ranks 2nd highest AQI at 26 of Good air quality, showing improvement over 2024 on the same day.

Day & Night AQI Trend: 6th Sep - 7th Sep 2025
Daiku, Okayama, Okayama, Japan

AQI

Day

Night

5 AM6th Sep 2025

6 PM

4 AM7th Sep 2025

Day time

Avg. Highest Time

12AMNaNth undefined

AQI

Avg. Lowest Time

12AMNaNth undefined

AQI

Night time

Avg. Highest Time

5PM6th Sep

55AQI

Avg. Lowest Time

9AM6th Sep

20AQI

In the last 24 hours,

Daiku's AQI reached its highest point of 55 at 5 PM during the Night, while the lowest point, 20, was recorded at 9 AM during the Night between 6th Sep and 7th Sep 2025.

Day & Night AQI Trend : Aug - Sep 2025
Daiku, Okayama, Okayama, Japan

AugSep

08th - 09th09th - 10th10th - 11th11th - 12th12th - 13th13th - 14th14th - 15th15th - 16th16th - 17th17th - 18th18th - 19th19th - 20th20th - 21st21st - 22nd22nd - 23rd23rd - 24th24th - 25th25th - 26th26th - 27th27th - 28th28th - 29th29th - 30th30th - 31st31st - 01st01st - 02nd02nd - 03rd03rd - 04th04th - 05th05th - 06th06th - 07th07th

Day

Night

28°C24/32°C

25°C23/27°C

24°C24/25°C

25°C25/26°C

25°C24/26°C

28°C25/31°C

29°C26/33°C

28°C26/32°C

28°C25/32°C

29°C26/33°C

29°C25/33°C

29°C26/33°C

29°C25/33°C

29°C26/32°C

29°C26/33°C

29°C26/32°C

28°C25/31°C

29°C26/33°C

30°C26/34°C

30°C26/33°C

29°C26/33°C

28°C25/32°C

26°C25/27°C

27°C25/32°C

--°C/°C

5 AM

11 AM

6 PM

11 PM

4 AM

--°C/°C

Day time

Avg. Highest Time

1 PM - 5 PM

52AQI

5 hours / Day

150 hours / Month

Avg. Lowest Time

9 AM

42AQI

1 hours / Day

30 hours / Month

In the last 30 days, during the daytime, the highest AQI was between 1 PM to 5 PM (Avg. 52), while the lowest AQI was between 9 AM to 9 AM (Avg. 42).

Night time

Avg. Highest Time

2 AM - 7 PM

47AQI

4 hours / Day

120 hours / Month

Avg. Lowest Time

12 AM - 1 AM

44AQI

2 hours / Day

60 hours / Month

In the last 30 days, during the daytime, the highest AQI was between 2 AM to 7 PM (Avg. 47), while the lowest AQI was between 12 AM to 1 AM (Avg. 44).

2025 Days Vs Air Quality
Daiku, Okayama, Okayama, Japan

2025

62%

155

37%

Total number of days with different AQI categories in last 249 days in 2025 (116 days remaining)

Good

155 Days

Moderate

91 Days

Poor

3 Days

Unhealthy

0 Days

Severe

0 Days

Hazardous

0 Days

Under WHO’s Safe Air Quality Limits: 62%

Health Risk Level:

Moderate

In 2025, 62% of 249 days were within WHO’s safe air quality limits, and 38% exceeded them. The risk of health issues is Moderate, particularly for individuals with respiratory or heart conditions.

Annual Air Quality Insights
Daiku, Okayama, Okayama, 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.

44AQI

42AQI

53AQI

51AQI

49AQI

52AQI

54AQI

50AQI

35AQI

No. of days

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

202549AQI

155

Highest AQI recorded in

July

54AQI

Lowest AQI recorded in

September

35AQI

202442AQI

211

Highest AQI recorded in

January

51AQI

Lowest AQI recorded in

December

35AQI

202349AQI

Highest AQI recorded in

December

49AQI

Lowest AQI recorded in

November

48AQI

202035AQI

Highest AQI recorded in

September

35AQI

Lowest AQI recorded in

September

35AQI

Most & Least Polluted Years Over the Last 4 Years

Most Polluted Year Recorded

2023(Avg.)

49AQI

Least Polluted Year Recorded

2020(Avg.)

35AQI

Daiku's annual 2025 AQI (49) shows an average percentage change of 18.9% (worsened AQI) compared to previous years: 2020 (35), 2023 (49), 2024 (42).


5 AM	30
6 AM	30
7 AM	31
8 AM	30
9 AM	20
10 AM	32
11 AM	30
12 PM	32
1 PM	36
2 PM	46
3 PM	49
4 PM	40
5 PM	55
6 PM	43
7 PM	48
8 PM	38
9 PM	31
10 PM	32
11 PM	34
12 AM	34
1 AM	30
2 AM	26
3 AM	27
4 AM	30

Daiku, Okayama, Okayama, Japan Historical Air Quality Analysis

September Air Quality AnalysisDaiku, Okayama, Okayama, Japan

Day & Night AQI Trend: 6th Sep - 7th Sep 2025Daiku, Okayama, Okayama, Japan

Day & Night AQI Trend : Aug - Sep 2025Daiku, Okayama, Okayama, Japan

2025 Days Vs Air Quality Daiku, Okayama, Okayama, Japan

Annual Air Quality InsightsDaiku, Okayama, Okayama, Japan

AQI levels in 2025

No. of days

September Air Quality Analysis
Daiku, Okayama, Okayama, Japan

Day & Night AQI Trend: 6th Sep - 7th Sep 2025
Daiku, Okayama, Okayama, Japan

Day & Night AQI Trend : Aug - Sep 2025
Daiku, Okayama, Okayama, Japan

2025 Days Vs Air Quality
Daiku, Okayama, Okayama, Japan

Annual Air Quality Insights
Daiku, Okayama, Okayama, Japan