Tomihisamachi, 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
Tomihisamachi, Matsuyama, Ehime, Japan

2021

2022

2023

2024

2025

AQI

Days

Days	2025	2024	2023	2022	2021
Sep. 1	38	35	23		68
Sep. 2	33	39	35	29	67
Sep. 3	38	62	48	35	24
Sep. 4	27	56	53	24	31
Sep. 5	22	44	37	18	44
Sep. 6	27	43	28	25	47
Sep. 7	30	40	30	36	55
Sep. 8	30	55	26	37	44
Sep. 9	30	65	35		42
Sep. 10	32	43	42	24	63
Sep. 11	30	26	20	36	66
Sep. 12	28	26	25	50	68
Sep. 13	33	38	35	54	71
Sep. 14	29	40	27	50	47
Sep. 15	34	34	25	43	31
Sep. 16	35	24	46	35	52
Sep. 17		27	44	35	35
Sep. 18		31	25	23	26
Sep. 19		30	49	23	29
Sep. 20		22	70	29	48
Sep. 21		25	18	26	50
Sep. 22		25	26	39	50
Sep. 23		28	25	41	69
Sep. 24		27	31	45	46
Sep. 25		37	29	49	51
Sep. 26		48	29	56	63
Sep. 27		45	37	44	54
Sep. 28		42	37	37	53
Sep. 29		36	34	36	52
Sep. 30		35	44	42	39

AQI Trends: Highest and Lowest

Highest AQI recorded on

13th Sep 2021

71AQI

Lowest AQI recorded on

5th Sep 2022

18AQI

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
Tomihisamachi, Matsuyama, Ehime, Japan

AQI

Day

Night

5 AM16th Sep 2025

6 PM

4 AM17th Sep 2025

Day time

Avg. Highest Time

12PM16th Sep

54AQI

Avg. Lowest Time

8AM16th Sep

32AQI

Night time

Avg. Highest Time

7PM16th Sep

52AQI

Avg. Lowest Time

2AM17th Sep

32AQI

In the last 24 hours,

Tomihisamachi's AQI reached its highest point of 54 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
Tomihisamachi, 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 - 2 PM

40AQI

2 hours / Day

60 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 2 PM (Avg. 40), while the lowest AQI was between 9 AM to 9 AM (Avg. 32).

Night time

Avg. Highest Time

7 PM

41AQI

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. 41), while the lowest AQI was between 12 AM to 12 AM (Avg. 36).

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

2025

73%

190

26%

0.3%

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

Good

190 Days

Moderate

68 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
Tomihisamachi, 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.

39AQI

38AQI

48AQI

46AQI

45AQI

49AQI

54AQI

44AQI

31AQI

No. of days

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

202545AQI

190

Highest AQI recorded in

July

54AQI

Lowest AQI recorded in

September

31AQI

202437AQI

321

Highest AQI recorded in

April

47AQI

Lowest AQI recorded in

December

31AQI

202338AQI

305

Highest AQI recorded in

April

48AQI

Lowest AQI recorded in

August

28AQI

202243AQI

236

Highest AQI recorded in

March

55AQI

Lowest AQI recorded in

December

33AQI

202149AQI

203

151

Highest AQI recorded in

June

61AQI

Lowest AQI recorded in

August

42AQI

202049AQI

150

100

Highest AQI recorded in

August

66AQI

Lowest AQI recorded in

July

42AQI

Most & Least Polluted Years Over the Last 6 Years

Most Polluted Year Recorded

2020(Avg.)

49AQI

Least Polluted Year Recorded

2024(Avg.)

37AQI

Tomihisamachi's annual 2025 AQI (45) shows an average percentage change of 4.7% (worsened AQI) compared to previous years: 2020 (49), 2021 (49), 2022 (43), 2023 (38), 2024 (37).


5 AM	32
6 AM	32
7 AM	32
8 AM	32
9 AM	34
10 AM	37
11 AM	46
12 PM	54
1 PM	51
2 PM	43
3 PM	46
4 PM	51
5 PM	45
6 PM	48
7 PM	52
8 PM	50
9 PM	47
10 PM	48
11 PM	42
12 AM	46
1 AM	38
2 AM	32
3 AM	33
4 AM	34

Tomihisamachi, Matsuyama, Ehime, Japan Historical Air Quality Analysis

September Air Quality AnalysisTomihisamachi, Matsuyama, Ehime, Japan

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

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

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

Annual Air Quality InsightsTomihisamachi, Matsuyama, Ehime, Japan

AQI levels in 2025

No. of days

September Air Quality Analysis
Tomihisamachi, Matsuyama, Ehime, Japan

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

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

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

Annual Air Quality Insights
Tomihisamachi, Matsuyama, Ehime, Japan