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
Matsuyama, Ehime, Japan

2021

2022

2023

2024

2025

AQI

Days

Days	2025	2024	2023	2022	2021
Sep. 1	38	40	27		61
Sep. 2	33	47	40	35	58
Sep. 3	38	67	49	39	26
Sep. 4	27	58	54	34	29
Sep. 5	22	49	41	24	42
Sep. 6	27	48	36	31	42
Sep. 7	30	44	36	39	44
Sep. 8	30	56	35	42	41
Sep. 9	30	67	41	49	38
Sep. 10	32	46	45	40	55
Sep. 11	30	31	28	43	57
Sep. 12	28	34	31	54	60
Sep. 13	33	42	43	54	64
Sep. 14	29	41	33	56	38
Sep. 15	34	33	33	42	30
Sep. 16		32	51	41	44
Sep. 17		37	48	38	31
Sep. 18		40	33	34	26
Sep. 19		37	54	24	28
Sep. 20		30	81	33	41
Sep. 21		33	33	33	44
Sep. 22		30	30	43	43
Sep. 23		31	29	47	62
Sep. 24		32	37	49	44
Sep. 25		45	36	50	43
Sep. 26		50	37	57	55
Sep. 27		48	44	43	45
Sep. 28		42	45	38	46
Sep. 29		42	42	41	46
Sep. 30		39	49	45	37

AQI Trends: Highest and Lowest

Highest AQI recorded on

20th Sep 2023

81AQI

Lowest AQI recorded on

5th Sep 2025

22AQI

Same Day Analysis (15th September ):
On this day, AQI across the 5 years varied significantly: 2025 ranks 2nd highest AQI at 34 of Good air quality, showing improvement over 2022 on the same day.

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

AQI

Day

Night

5 AM16th Sep 2025

6 PM

4 AM17th Sep 2025

Day time

Avg. Highest Time

1PM16th Sep

54AQI

Avg. Lowest Time

8AM16th Sep

32AQI

Night time

Avg. Highest Time

7PM16th Sep

53AQI

Avg. Lowest Time

2AM17th Sep

32AQI

In the last 24 hours,

Matsuyama's AQI reached its highest point of 54 at 1 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
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

1 PM - 6 PM

39AQI

6 hours / Day

180 hours / Month

Avg. Lowest Time

9 AM

32AQI

1 hours / Day

30 hours / Month

In the last 30 days, during the daytime, the highest AQI was between 1 PM to 6 PM (Avg. 39), while the lowest AQI was between 9 AM to 9 AM (Avg. 32).

Night time

Avg. Highest Time

7 PM - 10 PM

39AQI

4 hours / Day

120 hours / Month

Avg. Lowest Time

11 PM

36AQI

1 hours / Day

30 hours / Month

In the last 30 days, during the daytime, the highest AQI was between 7 PM to 10 PM (Avg. 39), while the lowest AQI was between 11 PM to 11 PM (Avg. 36).

2025 Days Vs Air Quality
Matsuyama, Ehime, Japan

2025

73%

188

27%

0.3%

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

Good

188 Days

Moderate

69 Days

Poor

1 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 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
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

51AQI

47AQI

45AQI

49AQI

55AQI

44AQI

31AQI

No. of days

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

202546AQI

188

Highest AQI recorded in

July

55AQI

Lowest AQI recorded in

September

31AQI

202442AQI

297

Highest AQI recorded in

April

54AQI

Lowest AQI recorded in

December

33AQI

202344AQI

269

Highest AQI recorded in

April

54AQI

Lowest AQI recorded in

August

35AQI

202245AQI

230

Highest AQI recorded in

May

56AQI

Lowest AQI recorded in

December

37AQI

202144AQI

245

114

Highest AQI recorded in

June

57AQI

Lowest AQI recorded in

April

38AQI

202044AQI

173

Highest AQI recorded in

August

59AQI

Lowest AQI recorded in

December

37AQI

Most & Least Polluted Years Over the Last 6 Years

Most Polluted Year Recorded

2025(Avg.)

46AQI

Least Polluted Year Recorded

2024(Avg.)

42AQI

Matsuyama's annual 2025 AQI (46) shows an average percentage change of 4.1% (worsened AQI) compared to previous years: 2020 (44), 2021 (44), 2022 (45), 2023 (44), 2024 (42).


5 AM	32
6 AM	32
7 AM	32
8 AM	32
9 AM	33
10 AM	34
11 AM	43
12 PM	53
1 PM	54
2 PM	43
3 PM	46
4 PM	47
5 PM	45
6 PM	50
7 PM	53
8 PM	51
9 PM	46
10 PM	43
11 PM	41
12 AM	46
1 AM	40
2 AM	32
3 AM	33
4 AM	34

Matsuyama, Ehime, Japan Historical Air Quality Analysis

September Air Quality AnalysisMatsuyama, Ehime, Japan

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

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

2025 Days Vs Air Quality Matsuyama, Ehime, Japan

Annual Air Quality InsightsMatsuyama, Ehime, Japan

AQI levels in 2025

No. of days

September Air Quality Analysis
Matsuyama, Ehime, Japan

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

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

2025 Days Vs Air Quality
Matsuyama, Ehime, Japan

Annual Air Quality Insights
Matsuyama, Ehime, Japan