Nagao, 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
Nagao, Fukuoka, Fukuoka, Japan

2021

2022

2023

2024

2025

AQI

Days

Days	2025	2024	2023	2022	2021
Sep. 1	42	32	24		39
Sep. 2	41	38	31	25	32
Sep. 3	45	46	38	29	23
Sep. 4	31	41	27	33	28
Sep. 5	31	60	17	23	31
Sep. 6	32	82	38	31	35
Sep. 7	34	74	39	37	39
Sep. 8	32	68	31	40	33
Sep. 9		67	30		32
Sep. 10		33	46	38	31
Sep. 11		30	52	52	36
Sep. 12		45	52	41	43
Sep. 13		38	42	46	62
Sep. 14		23	17	39	19
Sep. 15		22	32	36	22
Sep. 16		28	51	38	35
Sep. 17		38	36	36	25
Sep. 18		31	42	32	33
Sep. 19		32	40	34	32
Sep. 20		27	49	46	46
Sep. 21		35	34	32	39
Sep. 22		26	24	42	50
Sep. 23		30	29	47	58
Sep. 24		29	32	40	34
Sep. 25		37	38	41	38
Sep. 26		48	36	62	44
Sep. 27		33	45	41	40
Sep. 28		38	39	29	36
Sep. 29		37	45	27	32
Sep. 30		43	54	29	38

AQI Trends: Highest and Lowest

Highest AQI recorded on

6th Sep 2024

82AQI

Lowest AQI recorded on

5th Sep 2023

17AQI

Same Day Analysis (8th September ):
On this day, AQI across the 5 years varied significantly: 2025 ranks 4th highest AQI at 32 of Good air quality, showing improvement over 2024, 2022 and 2021 on the same day.

Day & Night AQI Trend: 8th Sep - 9th Sep 2025
Nagao, Fukuoka, Fukuoka, Japan

AQI

Day

Night

5 AM8th Sep 2025

6 PM

4 AM9th Sep 2025

Day time

Avg. Highest Time

4PM8th Sep

52AQI

Avg. Lowest Time

10AM8th Sep

30AQI

Night time

Avg. Highest Time

12AM9th Sep

40AQI

Avg. Lowest Time

2AM9th Sep

31AQI

In the last 24 hours,

Nagao's AQI reached its highest point of 52 at 4 PM during the Day, while the lowest point, 30, was recorded at 10 AM during the Day between 8th Sep and 9th Sep 2025.

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

AugSep

10th - 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 - 08th08th - 09th09th

Day

Night

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

28°C25/32°C

27°C26/31°C

27°C25/30°C

28°C25/32°C

29°C25/33°C

28°C25/32°C

5 AM

11 AM

6 PM

11 PM

4 AM

--°C/°C

Day time

Avg. Highest Time

11 AM - 4 PM

44AQI

6 hours / Day

180 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 11 AM to 4 PM (Avg. 44), while the lowest AQI was between 9 AM to 10 AM (Avg. 40).

Night time

Avg. Highest Time

12 AM - 7 PM

43AQI

6 hours / Day

180 hours / Month

Avg. Lowest Time

8 PM - 11 PM

41AQI

4 hours / Day

120 hours / Month

In the last 30 days, during the daytime, the highest AQI was between 12 AM to 7 PM (Avg. 43), while the lowest AQI was between 8 PM to 11 PM (Avg. 41).

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

2025

73%

182

27%

Total number of days with different AQI categories in last 252 days in 2025 (113 days remaining)

Good

182 Days

Moderate

69 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 252 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
Nagao, 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.

49AQI

44AQI

50AQI

48AQI

46AQI

37AQI

47AQI

45AQI

36AQI

No. of days

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

202546AQI

182

Highest AQI recorded in

March

50AQI

Lowest AQI recorded in

September

36AQI

202440AQI

298

Highest AQI recorded in

April

52AQI

Lowest AQI recorded in

July

26AQI

202344AQI

247

115

Highest AQI recorded in

April

55AQI

Lowest AQI recorded in

August

36AQI

202244AQI

236

Highest AQI recorded in

May

53AQI

Lowest AQI recorded in

August

32AQI

202141AQI

269

Highest AQI recorded in

March

50AQI

Lowest AQI recorded in

August

28AQI

202041AQI

189

Highest AQI recorded in

August

58AQI

Lowest AQI recorded in

July

25AQI

Most & Least Polluted Years Over the Last 6 Years

Most Polluted Year Recorded

2025(Avg.)

46AQI

Least Polluted Year Recorded

2024(Avg.)

40AQI

Nagao's annual 2025 AQI (46) shows an average percentage change of 8.5% (worsened AQI) compared to previous years: 2020 (41), 2021 (41), 2022 (44), 2023 (44), 2024 (40).


5 AM	30
6 AM	30
7 AM	30
8 AM	31
9 AM	36
10 AM	30
11 AM	40
12 PM	36
1 PM	43
2 PM	45
3 PM	44
4 PM	52
5 PM	46
6 PM	42
7 PM	37
8 PM	31
9 PM	37
10 PM	39
11 PM	34
12 AM	40
1 AM	33
2 AM	31
3 AM	32
4 AM	32

Nagao, Fukuoka, Fukuoka, Japan Historical Air Quality Analysis

September Air Quality AnalysisNagao, Fukuoka, Fukuoka, Japan

Day & Night AQI Trend: 8th Sep - 9th Sep 2025Nagao, Fukuoka, Fukuoka, Japan

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

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

Annual Air Quality InsightsNagao, Fukuoka, Fukuoka, Japan

AQI levels in 2025

No. of days

September Air Quality Analysis
Nagao, Fukuoka, Fukuoka, Japan

Day & Night AQI Trend: 8th Sep - 9th Sep 2025
Nagao, Fukuoka, Fukuoka, Japan

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

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

Annual Air Quality Insights
Nagao, Fukuoka, Fukuoka, Japan