Asodamachi, Matsuyama, Ehime, 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
Asodamachi, Matsuyama, Ehime, Japan

2021

2022

2023

2024

2025

AQI

Days

Days	2025	2024	2023	2022	2021
Sep. 1	37	40	24		61
Sep. 2	32	44	43	34	56
Sep. 3	37	67	52	38	27
Sep. 4	26	61	60	33	31
Sep. 5	21	51	43	23	41
Sep. 6	27	48	30	33	43
Sep. 7	30	49	37	37	46
Sep. 8	29	63	41	46	34
Sep. 9	31	71	42		41
Sep. 10	31	45	48	44	57
Sep. 11	29	26	23	45	58
Sep. 12	28	32	30	56	60
Sep. 13	32	44	40	55	64
Sep. 14	28	37	32	58	37
Sep. 15	34	34	35	45	29
Sep. 16	39	31	54	37	44
Sep. 17		35	57	41	33
Sep. 18		36	29	35	23
Sep. 19		38	61	25	30
Sep. 20		27	80	31	41
Sep. 21		32	37	32	45
Sep. 22		25	29	45	42
Sep. 23		27	26	47	63
Sep. 24		32	37	47	45
Sep. 25		48	42	54	43
Sep. 26		54	39	62	53
Sep. 27		47	46	43	44
Sep. 28		45	42	36	45
Sep. 29		44	44	44	41
Sep. 30		40	53	46	34

AQI Trends: Highest and Lowest

Highest AQI recorded on

20th Sep 2023

80AQI

Lowest AQI recorded on

5th Sep 2025

21AQI

Same Day Analysis (16th September ):
On this day, AQI across the 5 years varied significantly: 2025 ranks 3rd highest AQI at 39 of Good air quality, showing improvement over 2023 and 2021 on the same day.

Day & Night AQI Trend: 17th Sep - 18th Sep 2025
Asodamachi, Matsuyama, Ehime, Japan

AQI

Day

Night

5 AM17th Sep 2025

6 PM

4 AM18th Sep 2025

Day time

Avg. Highest Time

12AMNaNth undefined

AQI

Avg. Lowest Time

12AMNaNth undefined

AQI

Night time

Avg. Highest Time

12PM17th Sep

67AQI

Avg. Lowest Time

12AM18th Sep

31AQI

In the last 24 hours,

Asodamachi's AQI reached its highest point of 67 at 12 PM during the Night, while the lowest point, undefined, was recorded at 4 AM during the Night between 17th Sep and 18th Sep 2025.

Day & Night AQI Trend : Aug - Sep 2025
Asodamachi, Matsuyama, Ehime, Japan

AugSep

19th - 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 - 18th18th

Day

Night

27°C25/30°C

27°C24/31°C

27°C23/31°C

27°C25/30°C

28°C26/30°C

27°C25/30°C

27°C24/30°C

27°C25/30°C

28°C25/31°C

27°C24/31°C

27°C25/31°C

25°C24/26°C

27°C25/30°C

27°C25/29°C

27°C25/30°C

26°C25/29°C

25°C23/27°C

25°C23/28°C

26°C24/30°C

27°C25/30°C

27°C23/30°C

27°C24/29°C

--°C/°C

5 AM

11 AM

6 PM

11 PM

4 AM

--°C/°C

Day time

Avg. Highest Time

1 PM - 2 PM

39AQI

2 hours / Day

60 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 1 PM to 2 PM (Avg. 39), while the lowest AQI was between 9 AM to 9 AM (Avg. 31).

Night time

Avg. Highest Time

1 AM - 11 PM

38AQI

9 hours / Day

270 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 11 PM (Avg. 38), while the lowest AQI was between 12 AM to 12 AM (Avg. 36).

2025 Days Vs Air Quality
Asodamachi, Matsuyama, Ehime, Japan

2025

72%

187

27%

0.7%

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

Good

187 Days

Moderate

70 Days

Poor

2 Days

Unhealthy

0 Days

Severe

0 Days

Hazardous

0 Days

Under WHO’s Safe Air Quality Limits: 72%

Health Risk Level:

Low

In 2025, 72% 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
Asodamachi, Matsuyama, Ehime, 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.

41AQI

42AQI

51AQI

47AQI

45AQI

49AQI

55AQI

44AQI

31AQI

No. of days

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

202546AQI

187

Highest AQI recorded in

July

55AQI

Lowest AQI recorded in

September

31AQI

202442AQI

284

Highest AQI recorded in

April

56AQI

Lowest AQI recorded in

December

32AQI

202346AQI

242

120

Highest AQI recorded in

April

57AQI

Lowest AQI recorded in

August

36AQI

202246AQI

198

105

Highest AQI recorded in

May

58AQI

Lowest AQI recorded in

October

39AQI

202144AQI

242

112

Highest AQI recorded in

June

54AQI

Lowest AQI recorded in

August

37AQI

202042AQI

182

Highest AQI recorded in

August

57AQI

Lowest AQI recorded in

July

34AQI

Most & Least Polluted Years Over the Last 6 Years

Most Polluted Year Recorded

2022(Avg.)

46AQI

Least Polluted Year Recorded

2024(Avg.)

42AQI

Asodamachi's annual 2025 AQI (46) shows an average percentage change of 4.3% (worsened AQI) compared to previous years: 2020 (42), 2021 (44), 2022 (46), 2023 (46), 2024 (42).


5 AM	35
6 AM	34
7 AM	35
8 AM	35
9 AM	46
10 AM	54
11 AM	58
12 PM	67
1 PM	65
2 PM	50
3 PM	38
4 PM	44
5 PM	41
6 PM	44
7 PM	33
8 PM	32
9 PM	32
10 PM	39
11 PM	41
12 AM	31
1 AM	33
2 AM
3 AM
4 AM

Asodamachi, Matsuyama, Ehime, Japan Historical Air Quality Analysis

September Air Quality AnalysisAsodamachi, Matsuyama, Ehime, Japan

Day & Night AQI Trend: 17th Sep - 18th Sep 2025Asodamachi, Matsuyama, Ehime, Japan

Day & Night AQI Trend : Aug - Sep 2025Asodamachi, Matsuyama, Ehime, Japan

2025 Days Vs Air Quality Asodamachi, Matsuyama, Ehime, Japan

Annual Air Quality InsightsAsodamachi, Matsuyama, Ehime, Japan

AQI levels in 2025

No. of days

September Air Quality Analysis
Asodamachi, Matsuyama, Ehime, Japan

Day & Night AQI Trend: 17th Sep - 18th Sep 2025
Asodamachi, Matsuyama, Ehime, Japan

Day & Night AQI Trend : Aug - Sep 2025
Asodamachi, Matsuyama, Ehime, Japan

2025 Days Vs Air Quality
Asodamachi, Matsuyama, Ehime, Japan

Annual Air Quality Insights
Asodamachi, Matsuyama, Ehime, Japan