Uchiko, 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
Uchiko, Ehime, Japan

2021

2022

2023

2024

2025

AQI

Days

Days	2025	2024	2023	2022	2021
Sep. 1	39	25	22		67
Sep. 2	38	44	23	12	56
Sep. 3	37	50	22	12	36
Sep. 4	26	49	38	11	41
Sep. 5	22	47	27	11	36
Sep. 6	28	41	22	23	40
Sep. 7	31		26	28	35
Sep. 8	31		37	32	29
Sep. 9	34	44	30		46
Sep. 10	38	16	20	16	55
Sep. 11	31	18	18	25	52
Sep. 12	28	19	20	26	31
Sep. 13	32	23	15	15	31
Sep. 14	32	15	12	17	36
Sep. 15	35	12	20	18	18
Sep. 16		14	44	28	25
Sep. 17		19	38	19	29
Sep. 18		19	22	22	26
Sep. 19		24	48	27	44
Sep. 20		19	64	32	38
Sep. 21		21	26	37	49
Sep. 22		20	21	22	40
Sep. 23		25	22	22	61
Sep. 24		23	25	52	52
Sep. 25		29	20	48
Sep. 26		38	31	48
Sep. 27		22	39	35	29
Sep. 28		19	42	30	24
Sep. 29		21	48	40	23
Sep. 30		18	62	31	64

AQI Trends: Highest and Lowest

Highest AQI recorded on

1st Sep 2021

67AQI

Lowest AQI recorded on

4th Sep 2022

11AQI

Same Day Analysis (15th September ):
On this day, AQI across the 5 years varied significantly: 2025 ranks 1st highest AQI at 35 of Good air quality on the same day.

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

AQI

Day

Night

5 AM16th Sep 2025

6 PM

4 AM17th Sep 2025

Day time

Avg. Highest Time

12AMNaNth undefined

AQI

Avg. Lowest Time

12AMNaNth undefined

AQI

Night time

Avg. Highest Time

7PM16th Sep

55AQI

Avg. Lowest Time

12PM16th Sep

30AQI

In the last 24 hours,

Uchiko's AQI reached its highest point of 55 at 7 PM during the Night, while the lowest point, 30, was recorded at 12 PM during the Night between 16th Sep and 17th Sep 2025.

Day & Night AQI Trend : Aug - Sep 2025
Uchiko, 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

26°C22/30°C

26°C23/31°C

26°C22/31°C

26°C21/32°C

26°C22/30°C

26°C23/29°C

27°C24/31°C

26°C22/30°C

27°C23/30°C

27°C23/31°C

27°C24/31°C

27°C23/31°C

27°C23/32°C

27°C22/31°C

26°C22/31°C

23°C22/26°C

26°C23/30°C

26°C22/30°C

27°C24/31°C

26°C23/30°C

26°C23/31°C

25°C22/29°C

23°C20/27°C

25°C21/29°C

26°C23/31°C

26°C23/30°C

26°C23/31°C

--°C/°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 - 10 AM

33AQI

2 hours / Day

60 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 10 AM (Avg. 33).

Night time

Avg. Highest Time

7 PM - 8 PM

42AQI

2 hours / Day

60 hours / Month

Avg. Lowest Time

11 PM

38AQI

1 hours / Day

30 hours / Month

In the last 30 days, during the daytime, the highest AQI was between 7 PM to 8 PM (Avg. 42), while the lowest AQI was between 11 PM to 11 PM (Avg. 38).

2025 Days Vs Air Quality
Uchiko, Ehime, Japan

2025

79%

205

21%

Total number of days with different AQI categories in last 259 days in 2025 (106 days remaining)

Good

205 Days

Moderate

53 Days

Poor

0 Days

Unhealthy

0 Days

Severe

0 Days

Hazardous

0 Days

Under WHO’s Safe Air Quality Limits: 79%

Health Risk Level:

Low

In 2025, 79% of 259 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
Uchiko, 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.

37AQI

36AQI

46AQI

43AQI

42AQI

45AQI

50AQI

45AQI

32AQI

No. of days

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

202542AQI

205

Highest AQI recorded in

July

50AQI

Lowest AQI recorded in

September

32AQI

202429AQI

333

Highest AQI recorded in

August

37AQI

Lowest AQI recorded in

October

21AQI

202338AQI

289

Highest AQI recorded in

April

54AQI

Lowest AQI recorded in

August

22AQI

202239AQI

237

Highest AQI recorded in

May

52AQI

Lowest AQI recorded in

August

10AQI

202137AQI

268

Highest AQI recorded in

May

44AQI

Lowest AQI recorded in

August

28AQI

202033AQI

211

Highest AQI recorded in

August

44AQI

Lowest AQI recorded in

July

24AQI

Most & Least Polluted Years Over the Last 6 Years

Most Polluted Year Recorded

2025(Avg.)

42AQI

Least Polluted Year Recorded

2024(Avg.)

29AQI

Uchiko's annual 2025 AQI (42) shows an average percentage change of 21.8% (worsened AQI) compared to previous years: 2020 (33), 2021 (37), 2022 (39), 2023 (38), 2024 (29).


5 AM	33
6 AM	35
7 AM	34
8 AM	33
9 AM	38
10 AM	32
11 AM	32
12 PM	30
1 PM	32
2 PM	48
3 PM	42
4 PM	40
5 PM	53
6 PM	54
7 PM	55
8 PM	52
9 PM	48
10 PM	50
11 PM	46
12 AM	49
1 AM	38
2 AM	34
3 AM	33
4 AM	34

Uchiko, Ehime, Japan Historical Air Quality Analysis

September Air Quality AnalysisUchiko, Ehime, Japan

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

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

2025 Days Vs Air Quality Uchiko, Ehime, Japan

Annual Air Quality InsightsUchiko, Ehime, Japan

AQI levels in 2025

No. of days

September Air Quality Analysis
Uchiko, Ehime, Japan

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

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

2025 Days Vs Air Quality
Uchiko, Ehime, Japan

Annual Air Quality Insights
Uchiko, Ehime, Japan