Chiyo, Fukuoka, Fukuoka, 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
Chiyo, Fukuoka, Fukuoka, Japan

2021

2022

2023

2024

2025

AQI

Days

Days	2025	2024	2023	2022	2021
Sep. 1	44	42	23		33
Sep. 2	47	40	37	27	28
Sep. 3		45	37	27	22
Sep. 4		40	33	23	29
Sep. 5		55	37	15	30
Sep. 6		68	38	31	32
Sep. 7		66	35	37	38
Sep. 8		57	32	39	32
Sep. 9		59	30		26
Sep. 10		28	41	36	29
Sep. 11		20	49	40	38
Sep. 12		37	43	34	51
Sep. 13		29	38	36	68
Sep. 14		19	19	36	28
Sep. 15		18	40	29	25
Sep. 16		21	46	30	36
Sep. 17		25	36	31	38
Sep. 18		29	40	29	38
Sep. 19		22	41	33	38
Sep. 20		21	41	30	40
Sep. 21		21	33	27	42
Sep. 22		27	27	41	45
Sep. 23		28	29	44	57
Sep. 24		29	31	36	33
Sep. 25		34	39	36	38
Sep. 26		43	33	57	44
Sep. 27		33	42	42	46
Sep. 28		36	40	29	38
Sep. 29		33	44	27	34
Sep. 30		41	52	32	30

AQI Trends: Highest and Lowest

Highest AQI recorded on

13th Sep 2021

68AQI

Lowest AQI recorded on

5th Sep 2022

15AQI

Same Day Analysis (2nd September ):
On this day, AQI across the 5 years varied significantly: 2025 ranks 1st highest AQI at 47 of Good air quality on the same day.

Day & Night AQI Trend: 2nd Sep - 3rd Sep 2025
Chiyo, Fukuoka, Fukuoka, Japan

AQI

Day

Night

5 AM2nd Sep 2025

7 PM

4 AM3rd Sep 2025

Day time

Avg. Highest Time

5AM2nd Sep

47AQI

Avg. Lowest Time

1PM2nd Sep

18AQI

Night time

Avg. Highest Time

3AM3rd Sep

48AQI

Avg. Lowest Time

8PM2nd Sep

35AQI

In the last 24 hours,

Chiyo's AQI reached its highest point of 48 at 3 AM during the Night, while the lowest point, 18, was recorded at 1 PM during the Day between 2nd Sep and 3rd Sep 2025.

Day & Night AQI Trend : Aug - Sep 2025
Chiyo, Fukuoka, Fukuoka, Japan

AugSep

04th - 05th05th - 06th06th - 07th07th - 08th08th - 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

Day

Night

29°C27/33°C

30°C26/33°C

30°C27/35°C

28°C26/31°C

27°C25/31°C

24°C24/24°C

26°C25/26°C

26°C25/29°C

27°C24/31°C

28°C25/32°C

28°C25/33°C

28°C26/31°C

28°C25/31°C

28°C25/32°C

28°C25/33°C

28°C24/33°C

28°C25/31°C

28°C25/32°C

28°C25/31°C

28°C25/32°C

28°C25/31°C

28°C25/32°C

29°C25/32°C

29°C26/33°C

28°C25/32°C

28°C24/33°C

28°C25/31°C

5 AM

12 PM

7 PM

12 AM

4 AM

--°C/°C

Day time

Avg. Highest Time

5 AM - 8 AM

46AQI

4 hours / Day

120 hours / Month

Avg. Lowest Time

9 AM - 10 AM

40AQI

2 hours / Day

60 hours / Month

In the last 30 days, during the daytime, the highest AQI was between 5 AM to 8 AM (Avg. 46), while the lowest AQI was between 9 AM to 10 AM (Avg. 40).

Night time

Avg. Highest Time

12 AM - 11 PM

45AQI

9 hours / Day

270 hours / Month

Avg. Lowest Time

12 AM - 11 PM

45AQI

9 hours / Day

270 hours / Month

In the last 30 days, during the daytime, the highest AQI was between 12 AM to 11 PM (Avg. 45), while the lowest AQI was between 12 AM to 11 PM (Avg. 45).

2025 Days Vs Air Quality
Chiyo, Fukuoka, Fukuoka, Japan

2025

73%

179

27%

Total number of days with different AQI categories in last 246 days in 2025 (119 days remaining)

Good

179 Days

Moderate

66 Days

Poor

0 Days

Unhealthy

0 Days

Severe

0 Days

Hazardous

0 Days

Under WHO’s Safe Air Quality Limits: 73%

Health Risk Level:

Low

In 2025, 73% of 246 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
Chiyo, Fukuoka, Fukuoka, 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.

48AQI

40AQI

50AQI

48AQI

47AQI

38AQI

47AQI

45AQI

46AQI

No. of days

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

202545AQI

179

Highest AQI recorded in

March

50AQI

Lowest AQI recorded in

June

38AQI

202440AQI

282

Highest AQI recorded in

April

61AQI

Lowest AQI recorded in

July

22AQI

202345AQI

239

122

Highest AQI recorded in

March

59AQI

Lowest AQI recorded in

August

29AQI

202243AQI

234

Highest AQI recorded in

May

54AQI

Lowest AQI recorded in

September

33AQI

202143AQI

260

102

Highest AQI recorded in

March

55AQI

Lowest AQI recorded in

August

27AQI

202045AQI

171

Highest AQI recorded in

August

54AQI

Lowest AQI recorded in

July

27AQI

Most & Least Polluted Years Over the Last 6 Years

Most Polluted Year Recorded

2025(Avg.)

45AQI

Least Polluted Year Recorded

2024(Avg.)

40AQI

Chiyo's annual 2025 AQI (45) shows an average percentage change of 5.3% (worsened AQI) compared to previous years: 2020 (45), 2021 (43), 2022 (43), 2023 (45), 2024 (40).


5 AM	47
6 AM	47
7 AM	47
8 AM	46
9 AM	40
10 AM	42
11 AM	26
12 PM	22
1 PM	18
2 PM	22
3 PM	22
4 PM	24
5 PM	36
6 PM	36
7 PM	36
8 PM	35
9 PM	42
10 PM	46
11 PM	42
12 AM	45
1 AM	42
2 AM	46
3 AM	48
4 AM	45

Chiyo, Fukuoka, Fukuoka, Japan Historical Air Quality Analysis

September Air Quality AnalysisChiyo, Fukuoka, Fukuoka, Japan

Day & Night AQI Trend: 2nd Sep - 3rd Sep 2025Chiyo, Fukuoka, Fukuoka, Japan

Day & Night AQI Trend : Aug - Sep 2025Chiyo, Fukuoka, Fukuoka, Japan

2025 Days Vs Air Quality Chiyo, Fukuoka, Fukuoka, Japan

Annual Air Quality InsightsChiyo, Fukuoka, Fukuoka, Japan

AQI levels in 2025

No. of days

September Air Quality Analysis
Chiyo, Fukuoka, Fukuoka, Japan

Day & Night AQI Trend: 2nd Sep - 3rd Sep 2025
Chiyo, Fukuoka, Fukuoka, Japan

Day & Night AQI Trend : Aug - Sep 2025
Chiyo, Fukuoka, Fukuoka, Japan

2025 Days Vs Air Quality
Chiyo, Fukuoka, Fukuoka, Japan

Annual Air Quality Insights
Chiyo, Fukuoka, Fukuoka, Japan