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HistoryAQIPM2.5PM10COSO2NO2O3

Shiromachi, Tsukawaki, Oita, 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

Shiromachi, Tsukawaki, Oita, Japan

2021
2022
2023
2024
2025
AQI
.
Days

AQI Trends: Highest and Lowest

Highest AQI recorded on
5th Sep 2024
75AQI
Lowest AQI recorded on
5th Sep 2022
19AQI

Same Day Analysis (29th September ):
On this day, AQI across the 5 years varied significantly: 2025 ranks the most lowest AQI at 28 of Good air quality, showing improvement over 2024, 2023, 2022 and 2021 on the same day.

Download 2024 Annual Data

World Air Quality Report

Globe

2025 Days Vs Air Quality

Shiromachi, Tsukawaki, Oita, Japan

2025

75%

204

25%

68

Total number of days with different AQI categories in last 274 days in 2025 (91 days remaining)

Good
204 Days
Moderate
68 Days
Poor
0 Days
Unhealthy
0 Days
Severe
0 Days
Hazardous
0 Days

Under WHO’s Safe Air Quality Limits: 75%

Health Risk Level:

Low

In 2025, 75% of 274 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

Shiromachi, Tsukawaki, Oita, Japan

AQI levels in 2025

AQI
PM2.5
PM10
CO
SO2
NO2
O3
Sun.Mon.Tue.Wed.Thu.Fri.Sat.

Jan.

Feb.

Mar.

Apr.

May

Jun.

Jul.

Aug.

Sep.

Oct.

Nov.

Dec.

-1th undefined 2025
-1th undefined 2025
-1th undefined 2025
1st January 2025
38AQI
2nd January 2025
45AQI
3rd January 2025
37AQI
4th January 2025
41AQI
5th January 2025
42AQI
6th January 2025
56AQI
7th January 2025
33AQI
8th January 2025
43AQI
9th January 2025
30AQI
10th January 2025
36AQI
11th January 2025
40AQI
12th January 2025
45AQI
13th January 2025
50AQI
14th January 2025
56AQI
15th January 2025
53AQI
16th January 2025
56AQI
17th January 2025
59AQI
18th January 2025
56AQI
19th January 2025
60AQI
20th January 2025
62AQI
21st January 2025
76AQI
22nd January 2025
79AQI
23rd January 2025
76AQI
24th January 2025
79AQI
25th January 2025
51AQI
26th January 2025
51AQI
27th January 2025
45AQI
28th January 2025
38AQI
29th January 2025
35AQI
30th January 2025
44AQI
31st January 2025
53AQI
1st February 2025
46AQI
2nd February 2025
39AQI
3rd February 2025
50AQI
4th February 2025
34AQI
5th February 2025
42AQI
6th February 2025
33AQI
7th February 2025
47AQI
8th February 2025
30AQI
9th February 2025
36AQI
10th February 2025
35AQI
11th February 2025
46AQI
12th February 2025
57AQI
13th February 2025
37AQI
14th February 2025
52AQI
15th February 2025
34AQI
16th February 2025
50AQI
17th February 2025
44AQI
18th February 2025
41AQI
19th February 2025
44AQI
20th February 2025
41AQI
21st February 2025
42AQI
22nd February 2025
48AQI
23rd February 2025
47AQI
24th February 2025
41AQI
25th February 2025
44AQI
26th February 2025
47AQI
27th February 2025
67AQI
28th February 2025
64AQI
1st March 2025
63AQI
2nd March 2025
53AQI
3rd March 2025
43AQI
4th March 2025
34AQI
5th March 2025
30AQI
6th March 2025
32AQI
7th March 2025
37AQI
8th March 2025
44AQI
9th March 2025
47AQI
10th March 2025
51AQI
11th March 2025
46AQI
12th March 2025
52AQI
13th March 2025
57AQI
14th March 2025
39AQI
15th March 2025
37AQI
16th March 2025
28AQI
17th March 2025
52AQI
18th March 2025
44AQI
19th March 2025
44AQI
20th March 2025
55AQI
21st March 2025
60AQI
22nd March 2025
66AQI
23rd March 2025
69AQI
24th March 2025
59AQI
25th March 2025
72AQI
26th March 2025
70AQI
27th March 2025
64AQI
28th March 2025
66AQI
29th March 2025
57AQI
30th March 2025
45AQI
31st March 2025
46AQI
1st April 2025
45AQI
2nd April 2025
38AQI
3rd April 2025
37AQI
4th April 2025
40AQI
5th April 2025
45AQI
6th April 2025
46AQI
7th April 2025
45AQI
8th April 2025
44AQI
9th April 2025
54AQI
10th April 2025
49AQI
11th April 2025
55AQI
12th April 2025
55AQI
13th April 2025
48AQI
14th April 2025
53AQI
15th April 2025
28AQI
16th April 2025
46AQI
17th April 2025
46AQI
18th April 2025
51AQI
19th April 2025
55AQI
20th April 2025
50AQI
21st April 2025
43AQI
22nd April 2025
40AQI
23rd April 2025
27AQI
24th April 2025
37AQI
25th April 2025
51AQI
26th April 2025
49AQI
27th April 2025
55AQI
28th April 2025
48AQI
29th April 2025
50AQI
30th April 2025
54AQI
1st May 2025
50AQI
2nd May 2025
41AQI
3rd May 2025
50AQI
4th May 2025
40AQI
5th May 2025
43AQI
6th May 2025
33AQI
7th May 2025
37AQI
8th May 2025
41AQI
9th May 2025
32AQI
10th May 2025
38AQI
11th May 2025
42AQI
12th May 2025
52AQI
13th May 2025
54AQI
14th May 2025
62AQI
15th May 2025
59AQI
16th May 2025
60AQI
17th May 2025
40AQI
18th May 2025
50AQI
19th May 2025
56AQI
20th May 2025
51AQI
21st May 2025
39AQI
22nd May 2025
37AQI
23rd May 2025
44AQI
24th May 2025
28AQI
25th May 2025
30AQI
26th May 2025
33AQI
27th May 2025
44AQI
28th May 2025
45AQI
29th May 2025
47AQI
30th May 2025
45AQI
31st May 2025
43AQI
1st June 2025
49AQI
2nd June 2025
53AQI
3rd June 2025
32AQI
4th June 2025
48AQI
5th June 2025
47AQI
6th June 2025
60AQI
7th June 2025
67AQI
8th June 2025
70AQI
9th June 2025
39AQI
10th June 2025
33AQI
11th June 2025
47AQI
12th June 2025
43AQI
13th June 2025
43AQI
14th June 2025
30AQI
15th June 2025
28AQI
16th June 2025
29AQI
17th June 2025
35AQI
18th June 2025
39AQI
19th June 2025
44AQI
20th June 2025
50AQI
21st June 2025
39AQI
22nd June 2025
29AQI
23rd June 2025
26AQI
24th June 2025
29AQI
25th June 2025
34AQI
26th June 2025
35AQI
27th June 2025
37AQI
28th June 2025
40AQI
29th June 2025
48AQI
30th June 2025
58AQI
1st July 2025
73AQI
2nd July 2025
97AQI
3rd July 2025
92AQI
4th July 2025
96AQI
5th July 2025
77AQI
6th July 2025
59AQI
7th July 2025
58AQI
8th July 2025
63AQI
9th July 2025
73AQI
10th July 2025
63AQI
11th July 2025
46AQI
12th July 2025
47AQI
13th July 2025
41AQI
14th July 2025
39AQI
15th July 2025
48AQI
16th July 2025
60AQI
17th July 2025
59AQI
18th July 2025
37AQI
19th July 2025
36AQI
20th July 2025
32AQI
21st July 2025
33AQI
22nd July 2025
39AQI
23rd July 2025
35AQI
24th July 2025
28AQI
25th July 2025
25AQI
26th July 2025
23AQI
27th July 2025
22AQI
28th July 2025
24AQI
29th July 2025
26AQI
30th July 2025
25AQI
31st July 2025
29AQI
1st August 2025
44AQI
2nd August 2025
47AQI
3rd August 2025
49AQI
4th August 2025
47AQI
5th August 2025
45AQI
6th August 2025
44AQI
7th August 2025
45AQI
8th August 2025
43AQI
9th August 2025
40AQI
10th August 2025
37AQI
11th August 2025
30AQI
12th August 2025
35AQI
13th August 2025
37AQI
14th August 2025
43AQI
15th August 2025
46AQI
16th August 2025
44AQI
17th August 2025
42AQI
18th August 2025
46AQI
19th August 2025
49AQI
20th August 2025
40AQI
21st August 2025
37AQI
22nd August 2025
44AQI
23rd August 2025
43AQI
24th August 2025
42AQI
25th August 2025
43AQI
26th August 2025
39AQI
27th August 2025
41AQI
28th August 2025
45AQI
29th August 2025
48AQI
30th August 2025
49AQI
31st August 2025
46AQI
1st September 2025
39AQI
2nd September 2025
42AQI
3rd September 2025
38AQI
4th September 2025
25AQI
5th September 2025
23AQI
6th September 2025
30AQI
7th September 2025
36AQI
8th September 2025
29AQI
9th September 2025
30AQI
10th September 2025
28AQI
11th September 2025
32AQI
12th September 2025
30AQI
13th September 2025
31AQI
14th September 2025
30AQI
15th September 2025
30AQI
16th September 2025
35AQI
17th September 2025
30AQI
18th September 2025
26AQI
19th September 2025
27AQI
20th September 2025
32AQI
21st September 2025
25AQI
22nd September 2025
27AQI
23rd September 2025
29AQI
24th September 2025
23AQI
25th September 2025
39AQI
26th September 2025
43AQI
27th September 2025
28AQI
28th September 2025
35AQI
29th September 2025
28AQI
30th September 2025
1st October 2025
2nd October 2025
3rd October 2025
4th October 2025
5th October 2025
6th October 2025
7th October 2025
8th October 2025
9th October 2025
10th October 2025
11th October 2025
12th October 2025
13th October 2025
14th October 2025
15th October 2025
16th October 2025
17th October 2025
18th October 2025
19th October 2025
20th October 2025
21st October 2025
22nd October 2025
23rd October 2025
24th October 2025
25th October 2025
26th October 2025
27th October 2025
28th October 2025
29th October 2025
30th October 2025
31st October 2025
1st November 2025
2nd November 2025
3rd November 2025
4th November 2025
5th November 2025
6th November 2025
7th November 2025
8th November 2025
9th November 2025
10th November 2025
11th November 2025
12th November 2025
13th November 2025
14th November 2025
15th November 2025
16th November 2025
17th November 2025
18th November 2025
19th November 2025
20th November 2025
21st November 2025
22nd November 2025
23rd November 2025
24th November 2025
25th November 2025
26th November 2025
27th November 2025
28th November 2025
29th November 2025
30th November 2025
1st December 2025
2nd December 2025
3rd December 2025
4th December 2025
5th December 2025
6th December 2025
7th December 2025
8th December 2025
9th December 2025
10th December 2025
11th December 2025
12th December 2025
13th December 2025
14th December 2025
15th December 2025
16th December 2025
17th December 2025
18th December 2025
19th December 2025
20th December 2025
21st December 2025
22nd December 2025
23rd December 2025
24th December 2025
25th December 2025
26th December 2025
27th December 2025
28th December 2025
29th December 2025
30th December 2025
31st December 2025

50AQI

44AQI

50AQI

46AQI

44AQI

42AQI

49AQI

43AQI

31AQI

No. of days

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

202545AQI

16
15
24
4
15
16
21
9
24
7
25
5
19
12
31
29
204
68

Highest AQI recorded in

January

50AQI

Lowest AQI recorded in

September

31AQI

202443AQI

29
2
24
5
24
7
15
15
16
15
19
11
30
1
24
6
22
8
29
2
21
9
29
2
282
83

Highest AQI recorded in

April

53AQI

Lowest AQI recorded in

July

37AQI

202344AQI

23
7
1
19
9
15
16
12
18
17
14
19
11
26
4
31
29
1
23
8
21
8
26
5
261
101
1

Highest AQI recorded in

April

53AQI

Lowest AQI recorded in

August

32AQI

202248AQI

16
15
16
5
17
14
18
12
11
20
22
8
20
3
1
26
2
18
13
21
9
21
10
206
112

Highest AQI recorded in

May

57AQI

Lowest AQI recorded in

September

39AQI

202146AQI

15
16
13
15
14
15
16
5
18
13
16
14
28
3
29
2
25
5
20
11
19
11
19
12
232
122

Highest AQI recorded in

February

54AQI

Lowest AQI recorded in

August

32AQI

202049AQI

3
9
1
3
18
8
10
16
14
30
1
17
10
3
15
4
20
11
18
12
16
15
146
104
4

Highest AQI recorded in

March

68AQI

Lowest AQI recorded in

July

32AQI

Most & Least Polluted Years Over the Last 6 Years

Most Polluted Year Recorded
2020(Avg.)
49AQI
Least Polluted Year Recorded
2024(Avg.)
43AQI

Shiromachi's annual 2025 AQI (45) shows an average percentage change of -3.08% (improved AQI) compared to previous years: 2020 (49), 2021 (46), 2022 (48), 2023 (44), 2024 (43).