Tachiarai, 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
Tachiarai, Fukuoka, Japan

2021

2022

2023

2024

2025

AQI

Days

Days	2025	2024	2023	2022	2021
Sep. 1	39	40	25		37
Sep. 2	41	51	32	31	30
Sep. 3	41	67	34	31	27
Sep. 4	25	51	36	30	27
Sep. 5	26	66	30	25	35
Sep. 6	32	76	28	30	35
Sep. 7	37	79	38	38	45
Sep. 8	32	74	35	46	43
Sep. 9	32	66	35		34
Sep. 10	30	25	44	46	41
Sep. 11	35	35	43	51	45
Sep. 12	35	43	42	41	51
Sep. 13	32	33	29	35	63
Sep. 14	30	19	26	42	26
Sep. 15	30	16	44	32	26
Sep. 16	31	21	46	39	35
Sep. 17	30	31	39	39	25
Sep. 18	24	27	45	33	29
Sep. 19	27	30	43	29	34
Sep. 20		23	52	43	44
Sep. 21		27	31	35	42
Sep. 22		23	26	52	47
Sep. 23		26	31	57	56
Sep. 24		27	36	42	42
Sep. 25		32	32	55	44
Sep. 26		44	29	70	51
Sep. 27		45	40	44	45
Sep. 28		41	35	35	37
Sep. 29		39	45	31	35
Sep. 30		47	54	42	35

AQI Trends: Highest and Lowest

Highest AQI recorded on

7th Sep 2024

79AQI

Lowest AQI recorded on

15th Sep 2024

16AQI

Same Day Analysis (19th September ):
On this day, AQI across the 5 years varied significantly: 2025 ranks the most lowest AQI at 27 of Good air quality, showing improvement over 2024, 2023, 2022 and 2021 on the same day.

Day & Night AQI Trend: 20th Sep - 21st Sep 2025
Tachiarai, Fukuoka, Japan

AQI

Day

Night

5 AM20th Sep 2025

6 PM

4 AM21st Sep 2025

Day time

Avg. Highest Time

12AMNaNth undefined

AQI

Avg. Lowest Time

12AMNaNth undefined

AQI

Night time

Avg. Highest Time

10AM20th Sep

49AQI

Avg. Lowest Time

7PM20th Sep

17AQI

In the last 24 hours,

Tachiarai's AQI reached its highest point of 49 at 10 AM during the Night, while the lowest point, undefined, was recorded at 4 AM during the Night between 20th Sep and 21st Sep 2025.

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

AugSep

22nd - 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 - 20th20th - 21st21st

Day

Night

26°C22/31°C

26°C23/31°C

27°C23/33°C

26°C23/30°C

27°C23/32°C

26°C23/30°C

27°C23/32°C

27°C23/34°C

27°C23/33°C

26°C23/31°C

27°C23/32°C

26°C23/31°C

27°C23/33°C

25°C23/28°C

26°C23/30°C

27°C23/33°C

27°C23/32°C

24°C22/27°C

25°C22/30°C

26°C21/32°C

25°C23/29°C

26°C24/30°C

26°C23/32°C

26°C23/30°C

24°C22/28°C

24°C20/29°C

--°C/°C

5 AM

11 AM

6 PM

11 PM

4 AM

--°C/°C

Day time

Avg. Highest Time

5 AM - 8 AM

38AQI

4 hours / Day

120 hours / Month

Avg. Lowest Time

9 AM

33AQI

1 hours / Day

30 hours / Month

In the last 30 days, during the daytime, the highest AQI was between 5 AM to 8 AM (Avg. 38), while the lowest AQI was between 9 AM to 9 AM (Avg. 33).

Night time

Avg. Highest Time

2 AM - 4 AM

38AQI

3 hours / Day

90 hours / Month

Avg. Lowest Time

7 PM - 11 PM

35AQI

5 hours / Day

150 hours / Month

In the last 30 days, during the daytime, the highest AQI was between 2 AM to 4 AM (Avg. 38), while the lowest AQI was between 7 PM to 11 PM (Avg. 35).

2025 Days Vs Air Quality
Tachiarai, Fukuoka, Japan

2025

77%

201

23%

Total number of days with different AQI categories in last 263 days in 2025 (102 days remaining)

Good

201 Days

Moderate

61 Days

Poor

0 Days

Unhealthy

0 Days

Severe

0 Days

Hazardous

0 Days

Under WHO’s Safe Air Quality Limits: 77%

Health Risk Level:

Low

In 2025, 77% of 263 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
Tachiarai, 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

39AQI

47AQI

46AQI

44AQI

39AQI

47AQI

43AQI

32AQI

No. of days

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

202543AQI

201

Highest AQI recorded in

January

48AQI

Lowest AQI recorded in

September

32AQI

202441AQI

283

Highest AQI recorded in

April

51AQI

Lowest AQI recorded in

July

26AQI

202345AQI

249

114

Highest AQI recorded in

June

51AQI

Lowest AQI recorded in

August

33AQI

202245AQI

220

Highest AQI recorded in

May

55AQI

Lowest AQI recorded in

July

39AQI

202143AQI

261

103

Highest AQI recorded in

June

51AQI

Lowest AQI recorded in

August

32AQI

202046AQI

172

Highest AQI recorded in

August

57AQI

Lowest AQI recorded in

July

31AQI

Most & Least Polluted Years Over the Last 6 Years

Most Polluted Year Recorded

2020(Avg.)

46AQI

Least Polluted Year Recorded

2024(Avg.)

41AQI

Tachiarai's annual 2025 AQI (43) shows an average percentage change of -1.9% (improved AQI) compared to previous years: 2020 (46), 2021 (43), 2022 (45), 2023 (45), 2024 (41).


5 AM	27
6 AM	27
7 AM	26
8 AM	27
9 AM	45
10 AM	49
11 AM	46
12 PM	33
1 PM	24
2 PM	22
3 PM	22
4 PM	18
5 PM	19
6 PM	18
7 PM	17
8 PM	20
9 PM	23
10 PM	22
11 PM	22
12 AM	22
1 AM	23
2 AM
3 AM
4 AM

Tachiarai, Fukuoka, Japan Historical Air Quality Analysis

September Air Quality AnalysisTachiarai, Fukuoka, Japan

Day & Night AQI Trend: 20th Sep - 21st Sep 2025Tachiarai, Fukuoka, Japan

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

2025 Days Vs Air Quality Tachiarai, Fukuoka, Japan

Annual Air Quality InsightsTachiarai, Fukuoka, Japan

AQI levels in 2025

No. of days

September Air Quality Analysis
Tachiarai, Fukuoka, Japan

Day & Night AQI Trend: 20th Sep - 21st Sep 2025
Tachiarai, Fukuoka, Japan

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

2025 Days Vs Air Quality
Tachiarai, Fukuoka, Japan

Annual Air Quality Insights
Tachiarai, Fukuoka, Japan