Omura, Nagasaki, 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
Omura, Nagasaki, Japan

2021

2022

2023

2024

2025

AQI

Days

Days	2025	2024	2023	2022	2021
Sep. 1	38	39	21		24
Sep. 2	38	40	34	27	37
Sep. 3	41	60	51	21	35
Sep. 4	28	63	38	24	30
Sep. 5	28	74	30	18	40
Sep. 6	33	82	26	31	36
Sep. 7	35	76	36	35	41
Sep. 8	31	78	35	42	34
Sep. 9	27	63	35		32
Sep. 10	30	16	54	54	36
Sep. 11	33	18	63	70	34
Sep. 12	36	37	68	41	29
Sep. 13	30	54	46	19	28
Sep. 14	29	17	22	18	26
Sep. 15	28	18	44	18	25
Sep. 16		20	28	28	35
Sep. 17		35	33	34	34
Sep. 18		23	39	23	30
Sep. 19		21	31	26	29
Sep. 20		20	50	35	34
Sep. 21		21	25	29	39
Sep. 22		17	23	51	42
Sep. 23		23	26	59	61
Sep. 24		34	29	43	38
Sep. 25		41	39	52	51
Sep. 26		42	31	75	53
Sep. 27		36	35	38	50
Sep. 28		42	38	27	34
Sep. 29		43	40	27	31
Sep. 30		54	50	34	33

AQI Trends: Highest and Lowest

Highest AQI recorded on

6th Sep 2024

82AQI

Lowest AQI recorded on

10th Sep 2024

16AQI

Same Day Analysis (15th September ):
On this day, AQI across the 5 years varied significantly: 2025 ranks 2nd highest AQI at 28 of Good air quality, showing improvement over 2023 on the same day.

Day & Night AQI Trend: 16th Sep - 17th Sep 2025
Omura, Nagasaki, Japan

AQI

Day

Night

5 AM16th Sep 2025

6 PM

4 AM17th Sep 2025

Day time

Avg. Highest Time

7AM16th Sep

30AQI

Avg. Lowest Time

6PM16th Sep

17AQI

Night time

Avg. Highest Time

2AM17th Sep

32AQI

Avg. Lowest Time

7PM16th Sep

16AQI

In the last 24 hours,

Omura's AQI reached its highest point of 32 at 2 AM during the Night, while the lowest point, 16, was recorded at 7 PM during the Night between 16th Sep and 17th Sep 2025.

Day & Night AQI Trend : Aug - Sep 2025
Omura, Nagasaki, Japan

AugSep

18th - 19th19th - 20th20th - 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

Day

Night

27°C24/32°C

28°C25/32°C

27°C24/32°C

28°C24/32°C

28°C25/32°C

28°C25/31°C

28°C25/32°C

28°C24/32°C

28°C25/32°C

28°C25/33°C

28°C25/32°C

28°C25/31°C

27°C25/31°C

28°C24/33°C

27°C25/31°C

28°C24/32°C

28°C25/32°C

28°C24/31°C

26°C24/28°C

26°C23/31°C

27°C24/31°C

27°C25/29°C

27°C25/31°C

28°C25/31°C

28°C24/32°C

5 AM

11 AM

6 PM

11 PM

4 AM

--°C/°C

Day time

Avg. Highest Time

3 PM - 6 PM

39AQI

4 hours / Day

120 hours / Month

Avg. Lowest Time

9 AM

31AQI

1 hours / Day

30 hours / Month

In the last 30 days, during the daytime, the highest AQI was between 3 PM to 6 PM (Avg. 39), while the lowest AQI was between 9 AM to 9 AM (Avg. 31).

Night time

Avg. Highest Time

1 AM - 7 PM

39AQI

5 hours / Day

150 hours / Month

Avg. Lowest Time

12 AM

36AQI

1 hours / Day

30 hours / Month

In the last 30 days, during the daytime, the highest AQI was between 1 AM to 7 PM (Avg. 39), while the lowest AQI was between 12 AM to 12 AM (Avg. 36).

2025 Days Vs Air Quality
Omura, Nagasaki, Japan

2025

83%

215

17%

Total number of days with different AQI categories in last 260 days in 2025 (105 days remaining)

Good

215 Days

Moderate

43 Days

Poor

0 Days

Unhealthy

0 Days

Severe

0 Days

Hazardous

0 Days

Under WHO’s Safe Air Quality Limits: 83%

Health Risk Level:

Low

In 2025, 83% of 260 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
Omura, Nagasaki, 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.

45AQI

38AQI

45AQI

43AQI

44AQI

34AQI

44AQI

43AQI

32AQI

No. of days

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

202541AQI

215

Highest AQI recorded in

March

45AQI

Lowest AQI recorded in

September

32AQI

202438AQI

299

Highest AQI recorded in

April

49AQI

Lowest AQI recorded in

July

20AQI

202341AQI

276

Highest AQI recorded in

January

49AQI

Lowest AQI recorded in

August

32AQI

202241AQI

237

Highest AQI recorded in

August

57AQI

Lowest AQI recorded in

June

35AQI

202138AQI

298

Highest AQI recorded in

June

45AQI

Lowest AQI recorded in

August

33AQI

202039AQI

144

Highest AQI recorded in

August

50AQI

Lowest AQI recorded in

September

0AQI

Most & Least Polluted Years Over the Last 6 Years

Most Polluted Year Recorded

2025(Avg.)

41AQI

Least Polluted Year Recorded

2024(Avg.)

38AQI

Omura's annual 2025 AQI (41) shows an average percentage change of 5.1% (worsened AQI) compared to previous years: 2020 (39), 2021 (38), 2022 (41), 2023 (41), 2024 (38).


5 AM	30
6 AM	29
7 AM	30
8 AM	30
9 AM	22
10 AM	19
11 AM	20
12 PM	18
1 PM	18
2 PM	21
3 PM	20
4 PM	17
5 PM	17
6 PM	17
7 PM	16
8 PM	20
9 PM	23
10 PM	24
11 PM	24
12 AM	24
1 AM	29
2 AM	32
3 AM	32
4 AM	30

Omura, Nagasaki, Japan Historical Air Quality Analysis

September Air Quality AnalysisOmura, Nagasaki, Japan

Day & Night AQI Trend: 16th Sep - 17th Sep 2025Omura, Nagasaki, Japan

Day & Night AQI Trend : Aug - Sep 2025Omura, Nagasaki, Japan

2025 Days Vs Air Quality Omura, Nagasaki, Japan

Annual Air Quality InsightsOmura, Nagasaki, Japan

AQI levels in 2025

No. of days

September Air Quality Analysis
Omura, Nagasaki, Japan

Day & Night AQI Trend: 16th Sep - 17th Sep 2025
Omura, Nagasaki, Japan

Day & Night AQI Trend : Aug - Sep 2025
Omura, Nagasaki, Japan

2025 Days Vs Air Quality
Omura, Nagasaki, Japan

Annual Air Quality Insights
Omura, Nagasaki, Japan