Taisanjicho, 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
Taisanjicho, Matsuyama, Ehime, Japan

2021

2022

2023

2024

2025

AQI

Days

Days	2025	2024	2023	2022	2021
Sep. 1	37	45	33		59
Sep. 2	33	57	47	35	59
Sep. 3	39	71	49	44	32
Sep. 4	27	52	45	34	24
Sep. 5	25	51	44	30	37
Sep. 6	26	51	41	34	42
Sep. 7	30	41	39	41	34
Sep. 8	30	52	35	40	42
Sep. 9	29	64	42	48	32
Sep. 10	32	49	49	46	45
Sep. 11	30	36	39	42	53
Sep. 12	28	44	41	55	57
Sep. 13	33	41	51	61	61
Sep. 14	29	43	39	64	36
Sep. 15	34	33	28	49	30
Sep. 16	35	34	53	48	40
Sep. 17		52	45	37	29
Sep. 18		46	44	36	27
Sep. 19		47	62	24	29
Sep. 20		39	85	33	39
Sep. 21		45	33	34	37
Sep. 22		40	38	44	42
Sep. 23		37	36	54	62
Sep. 24		36	41	53	46
Sep. 25		48	35	45	40
Sep. 26		46	39	54	53
Sep. 27		52	37	47	39
Sep. 28		41	54	40	46
Sep. 29		43	43	46	46
Sep. 30		46	52	44	41

AQI Trends: Highest and Lowest

Highest AQI recorded on

20th Sep 2023

85AQI

Lowest AQI recorded on

4th Sep 2021

24AQI

Same Day Analysis (16th September ):
On this day, AQI across the 5 years varied significantly: 2025 ranks 4th highest AQI at 35 of Good air quality, showing improvement over 2023, 2022 and 2021 on the same day.

Day & Night AQI Trend: 16th Sep - 17th Sep 2025
Taisanjicho, Matsuyama, Ehime, Japan

AQI

Day

Night

5 AM16th Sep 2025

6 PM

4 AM17th Sep 2025

Day time

Avg. Highest Time

12PM16th Sep

55AQI

Avg. Lowest Time

8AM16th Sep

32AQI

Night time

Avg. Highest Time

7PM16th Sep

49AQI

Avg. Lowest Time

2AM17th Sep

32AQI

In the last 24 hours,

Taisanjicho's AQI reached its highest point of 55 at 12 PM during the Day, while the lowest point, 32, was recorded at 2 AM during the Night between 16th Sep and 17th Sep 2025.

Day & Night AQI Trend : Aug - Sep 2025
Taisanjicho, Matsuyama, Ehime, 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°C25/29°C

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

5 AM

11 AM

6 PM

11 PM

4 AM

--°C/°C

Day time

Avg. Highest Time

12 PM - 2 PM

39AQI

3 hours / Day

90 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 12 PM to 2 PM (Avg. 39), while the lowest AQI was between 9 AM to 9 AM (Avg. 31).

Night time

Avg. Highest Time

7 PM

40AQI

1 hours / Day

30 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 7 PM to 7 PM (Avg. 40), while the lowest AQI was between 12 AM to 12 AM (Avg. 36).

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

2025

72%

187

27%

0.3%

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

Good

187 Days

Moderate

71 Days

Poor

1 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
Taisanjicho, 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

52AQI

47AQI

46AQI

49AQI

56AQI

43AQI

31AQI

No. of days

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

202546AQI

187

Highest AQI recorded in

July

56AQI

Lowest AQI recorded in

September

31AQI

202445AQI

276

Highest AQI recorded in

April

57AQI

Lowest AQI recorded in

December

34AQI

202346AQI

252

111

Highest AQI recorded in

April

55AQI

Lowest AQI recorded in

August

39AQI

202246AQI

218

Highest AQI recorded in

May

58AQI

Lowest AQI recorded in

December

37AQI

202143AQI

254

104

Highest AQI recorded in

June

57AQI

Lowest AQI recorded in

January

36AQI

202044AQI

177

Highest AQI recorded in

August

60AQI

Lowest AQI recorded in

December

34AQI

Most & Least Polluted Years Over the Last 6 Years

Most Polluted Year Recorded

2023(Avg.)

46AQI

Least Polluted Year Recorded

2021(Avg.)

43AQI

Taisanjicho's annual 2025 AQI (46) shows an average percentage change of 3.06% (worsened AQI) compared to previous years: 2020 (44), 2021 (43), 2022 (46), 2023 (46), 2024 (45).


5 AM	32
6 AM	32
7 AM	32
8 AM	32
9 AM	35
10 AM	35
11 AM	46
12 PM	55
1 PM	54
2 PM	47
3 PM	49
4 PM	47
5 PM	41
6 PM	51
7 PM	49
8 PM	48
9 PM	45
10 PM	42
11 PM	41
12 AM	46
1 AM	36
2 AM	32
3 AM	33
4 AM	34

Taisanjicho, Matsuyama, Ehime, Japan Historical Air Quality Analysis

September Air Quality AnalysisTaisanjicho, Matsuyama, Ehime, Japan

Day & Night AQI Trend: 16th Sep - 17th Sep 2025Taisanjicho, Matsuyama, Ehime, Japan

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

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

Annual Air Quality InsightsTaisanjicho, Matsuyama, Ehime, Japan

AQI levels in 2025

No. of days

September Air Quality Analysis
Taisanjicho, Matsuyama, Ehime, Japan

Day & Night AQI Trend: 16th Sep - 17th Sep 2025
Taisanjicho, Matsuyama, Ehime, Japan

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

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

Annual Air Quality Insights
Taisanjicho, Matsuyama, Ehime, Japan