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HistoryAQIPM₂.₅PM₁₀COSO₂NO₂O₃

Joetsu, Niigata, 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+

October Air Quality Analysis

Joetsu, Niigata, Japan

2022
2023
2024
2025
2026
AQI
.
Days

AQI Trends: Highest and Lowest

Highest AQI recorded on
18th Oct 2025
61AQI
Lowest AQI recorded on
26th Oct 2022
19AQI

Same Day Analysis (3rd October):
On this day, AQI across the 5 years varied significantly: 2026 ranks the most lowest AQI at 26 of Good air quality, showing improvement over 2025, 2024, 2023 and 2022 on the same day.

Day & Night AQI Trend: 3rd Oct - 4th Oct 2026

Joetsu, Niigata, Japan

AQI
Day
Night
.

5 AM3rd Oct 2026

5 PM

4 AM4th Oct 2026

Day time
Avg. Highest Time
5PM3rd Oct

44AQI

Avg. Lowest Time
2PM3rd Oct

21AQI

Night time
Avg. Highest Time
6PM3rd Oct

40AQI

Avg. Lowest Time
2AM4th Oct

21AQI

In the last 24 hours,

Joetsu's AQI reached its highest point of 44 at 5 PM during the Day, while the lowest point, 21, was recorded at 2 AM during the Night between 3rd Oct and 4th Oct 2026.

Day & Night AQI Trend : Sep - Oct 2026

Joetsu, Niigata, Japan

SepOct
05th - 06th06th - 07th07th - 08th08th - 09th09th - 10th10th - 11th11th - 12th12th - 13th13th - 14th14th - 15th15th - 16th16th - 17th17th - 18th18th - 19th19th - 20th20th - 21st21st - 22nd22nd - 23rd23rd - 24th24th - 25th25th - 26th26th - 27th27th - 28th28th - 29th29th - 30th30th - 01st01st - 02nd02nd - 03rd03rd - 04th04th
Day
Night
5th Sep 2026215 AMAQI
5th Sep 2026236 AMAQI
5th Sep 2026257 AMAQI
5th Sep 2026238 AMAQI
5th Sep 2026259 AMAQI
5th Sep 20262510 AMAQI
5th Sep 20262911 AMAQI
5th Sep 20262512 PMAQI
5th Sep 2026251 PMAQI
5th Sep 2026272 PMAQI
5th Sep 2026213 PMAQI
5th Sep 2026254 PMAQI
5th Sep 2026215 PMAQI
5th Sep 2026256 PMAQI
5th Sep 2026257 PMAQI
5th Sep 2026338 PMAQI
5th Sep 2026339 PMAQI
5th Sep 20263310 PMAQI
5th Sep 20263811 PMAQI
6th Sep 20263612 AMAQI
6th Sep 2026421 AMAQI
6th Sep 2026382 AMAQI
6th Sep 2026403 AMAQI
6th Sep 2026424 AMAQI

18°C16/23°C

6th Sep 2026485 AMAQI
6th Sep 2026486 AMAQI
6th Sep 2026407 AMAQI
6th Sep 2026388 AMAQI
6th Sep 2026389 AMAQI
6th Sep 20263810 AMAQI
6th Sep 20263811 AMAQI
6th Sep 20263112 PMAQI
6th Sep 2026291 PMAQI
6th Sep 2026292 PMAQI
6th Sep 2026273 PMAQI
6th Sep 2026214 PMAQI
6th Sep 2026235 PMAQI
6th Sep 2026216 PMAQI
6th Sep 2026197 PMAQI
6th Sep 2026148 PMAQI
6th Sep 2026179 PMAQI
6th Sep 20261410 PMAQI
6th Sep 20261911 PMAQI
7th Sep 20261412 AMAQI
7th Sep 2026171 AMAQI
7th Sep 2026172 AMAQI
7th Sep 2026173 AMAQI
7th Sep 2026174 AMAQI

20°C17/25°C

7th Sep 2026125 AMAQI
7th Sep 2026146 AMAQI
7th Sep 2026127 AMAQI
7th Sep 2026168 AMAQI
7th Sep 2026239 AMAQI
7th Sep 20261910 AMAQI
7th Sep 20261411 AMAQI
7th Sep 20261412 PMAQI
7th Sep 2026141 PMAQI
7th Sep 2026142 PMAQI
7th Sep 2026143 PMAQI
7th Sep 2026124 PMAQI
7th Sep 2026125 PMAQI
7th Sep 2026216 PMAQI
7th Sep 2026197 PMAQI
7th Sep 2026128 PMAQI
7th Sep 2026149 PMAQI
7th Sep 20261710 PMAQI
7th Sep 20261911 PMAQI
8th Sep 20261912 AMAQI
8th Sep 2026231 AMAQI
8th Sep 2026252 AMAQI
8th Sep 2026213 AMAQI
8th Sep 2026234 AMAQI

21°C18/25°C

8th Sep 2026255 AMAQI
8th Sep 2026236 AMAQI
8th Sep 2026237 AMAQI
8th Sep 2026238 AMAQI
8th Sep 2026259 AMAQI
8th Sep 20262510 AMAQI
8th Sep 20262511 AMAQI
8th Sep 20262312 PMAQI
8th Sep 2026251 PMAQI
8th Sep 2026292 PMAQI
8th Sep 2026253 PMAQI
8th Sep 2026254 PMAQI
8th Sep 2026235 PMAQI
8th Sep 2026236 PMAQI
8th Sep 2026277 PMAQI
8th Sep 2026258 PMAQI
8th Sep 2026239 PMAQI
8th Sep 20262710 PMAQI
8th Sep 20262911 PMAQI
9th Sep 20262712 AMAQI
9th Sep 2026271 AMAQI
9th Sep 2026252 AMAQI
9th Sep 2026253 AMAQI
9th Sep 2026294 AMAQI

21°C20/24°C

9th Sep 2026255 AMAQI
9th Sep 2026256 AMAQI
9th Sep 2026257 AMAQI
9th Sep 2026278 AMAQI
9th Sep 2026259 AMAQI
9th Sep 20262510 AMAQI
9th Sep 20262111 AMAQI
9th Sep 20262312 PMAQI
9th Sep 2026231 PMAQI
9th Sep 2026232 PMAQI
9th Sep 2026233 PMAQI
9th Sep 2026234 PMAQI
9th Sep 2026255 PMAQI
9th Sep 2026256 PMAQI
9th Sep 2026257 PMAQI
9th Sep 2026258 PMAQI
9th Sep 2026239 PMAQI
9th Sep 20262310 PMAQI
9th Sep 20262511 PMAQI
10th Sep 20262312 AMAQI
10th Sep 2026251 AMAQI
10th Sep 2026232 AMAQI
10th Sep 2026253 AMAQI
10th Sep 2026274 AMAQI

18°C16/21°C

10th Sep 2026275 AMAQI
10th Sep 2026256 AMAQI
10th Sep 2026257 AMAQI
10th Sep 2026238 AMAQI
10th Sep 2026259 AMAQI
10th Sep 20262110 AMAQI
10th Sep 20262711 AMAQI
10th Sep 20262712 PMAQI
10th Sep 2026251 PMAQI
10th Sep 2026252 PMAQI
10th Sep 2026253 PMAQI
10th Sep 2026254 PMAQI
10th Sep 2026275 PMAQI
10th Sep 2026216 PMAQI
10th Sep 2026237 PMAQI
10th Sep 2026218 PMAQI
10th Sep 2026219 PMAQI
10th Sep 20262310 PMAQI
10th Sep 20262111 PMAQI
11th Sep 20262112 AMAQI
11th Sep 2026251 AMAQI
11th Sep 2026252 AMAQI
11th Sep 2026253 AMAQI
11th Sep 2026254 AMAQI

17°C15/22°C

11th Sep 2026295 AMAQI
11th Sep 2026296 AMAQI
11th Sep 2026257 AMAQI
11th Sep 2026258 AMAQI
11th Sep 2026259 AMAQI
11th Sep 20262510 AMAQI
11th Sep 20262511 AMAQI
11th Sep 20262112 PMAQI
11th Sep 2026211 PMAQI
11th Sep 2026212 PMAQI
11th Sep 2026213 PMAQI
11th Sep 2026234 PMAQI
11th Sep 2026215 PMAQI
11th Sep 2026236 PMAQI
11th Sep 2026237 PMAQI
11th Sep 2026258 PMAQI
11th Sep 2026259 PMAQI
11th Sep 20262510 PMAQI
11th Sep 20262511 PMAQI
12th Sep 20262512 AMAQI
12th Sep 2026291 AMAQI
12th Sep 2026272 AMAQI
12th Sep 2026293 AMAQI
12th Sep 2026234 AMAQI

17°C16/19°C

12th Sep 2026275 AMAQI
12th Sep 2026296 AMAQI
12th Sep 2026257 AMAQI
12th Sep 2026218 AMAQI
12th Sep 2026219 AMAQI
12th Sep 20262310 AMAQI
12th Sep 20262311 AMAQI
12th Sep 20262312 PMAQI
12th Sep 2026251 PMAQI
12th Sep 2026292 PMAQI
12th Sep 2026253 PMAQI
12th Sep 2026254 PMAQI
12th Sep 2026275 PMAQI
12th Sep 2026236 PMAQI
12th Sep 2026237 PMAQI
12th Sep 2026218 PMAQI
12th Sep 2026219 PMAQI
12th Sep 20262310 PMAQI
12th Sep 20262111 PMAQI
13th Sep 20262312 AMAQI
13th Sep 2026211 AMAQI
13th Sep 2026212 AMAQI
13th Sep 2026213 AMAQI
13th Sep 2026214 AMAQI

20°C18/24°C

13th Sep 2026216 AMAQI
13th Sep 2026217 AMAQI
13th Sep 2026218 AMAQI
13th Sep 2026219 AMAQI
13th Sep 20262110 AMAQI
13th Sep 20262111 AMAQI
13th Sep 20262112 PMAQI
13th Sep 2026211 PMAQI
13th Sep 2026232 PMAQI
13th Sep 2026293 PMAQI
13th Sep 2026294 PMAQI
13th Sep 2026315 PMAQI
13th Sep 2026256 PMAQI
13th Sep 2026277 PMAQI
13th Sep 2026298 PMAQI
13th Sep 2026279 PMAQI
13th Sep 20262910 PMAQI
13th Sep 20262711 PMAQI
14th Sep 20262512 AMAQI
14th Sep 2026251 AMAQI
14th Sep 2026252 AMAQI
14th Sep 2026253 AMAQI
14th Sep 2026274 AMAQI

22°C19/27°C

14th Sep 2026215 AMAQI
14th Sep 2026236 AMAQI
14th Sep 2026217 AMAQI
14th Sep 2026218 AMAQI
14th Sep 2026219 AMAQI
14th Sep 20262110 AMAQI
14th Sep 20262111 AMAQI
14th Sep 20262112 PMAQI
14th Sep 2026331 PMAQI
14th Sep 2026332 PMAQI
14th Sep 2026403 PMAQI
14th Sep 2026294 PMAQI
14th Sep 2026295 PMAQI
14th Sep 2026336 PMAQI
14th Sep 2026337 PMAQI
14th Sep 2026258 PMAQI
14th Sep 2026319 PMAQI
14th Sep 20263310 PMAQI
14th Sep 20262511 PMAQI
15th Sep 20262112 AMAQI
15th Sep 2026251 AMAQI
15th Sep 2026312 AMAQI
15th Sep 2026253 AMAQI
15th Sep 2026254 AMAQI

21°C18/26°C

15th Sep 2026255 AMAQI
15th Sep 2026296 AMAQI
15th Sep 2026257 AMAQI
15th Sep 2026338 AMAQI
15th Sep 2026299 AMAQI
15th Sep 20262910 AMAQI
15th Sep 20262911 AMAQI
15th Sep 20262912 PMAQI
15th Sep 2026271 PMAQI
15th Sep 2026272 PMAQI
15th Sep 2026233 PMAQI
15th Sep 2026254 PMAQI
15th Sep 2026215 PMAQI
15th Sep 2026406 PMAQI
15th Sep 2026237 PMAQI
15th Sep 2026238 PMAQI
15th Sep 2026259 PMAQI
15th Sep 20261710 PMAQI
15th Sep 20262311 PMAQI
16th Sep 20262112 AMAQI
16th Sep 2026171 AMAQI
16th Sep 2026212 AMAQI
16th Sep 2026213 AMAQI
16th Sep 2026194 AMAQI

18°C17/20°C

16th Sep 2026215 AMAQI
16th Sep 2026216 AMAQI
16th Sep 2026217 AMAQI
16th Sep 2026218 AMAQI
16th Sep 2026199 AMAQI
16th Sep 20261910 AMAQI
16th Sep 20262111 AMAQI
16th Sep 20262112 PMAQI
16th Sep 2026231 PMAQI
16th Sep 2026212 PMAQI
16th Sep 2026253 PMAQI
16th Sep 2026214 PMAQI
16th Sep 2026255 PMAQI
16th Sep 2026276 PMAQI
16th Sep 2026257 PMAQI
16th Sep 2026218 PMAQI
16th Sep 2026279 PMAQI
16th Sep 20262510 PMAQI
16th Sep 20262311 PMAQI
17th Sep 20262512 AMAQI
17th Sep 2026251 AMAQI
17th Sep 2026252 AMAQI
17th Sep 2026253 AMAQI
17th Sep 2026254 AMAQI

17°C15/18°C

17th Sep 2026255 AMAQI
17th Sep 2026256 AMAQI
17th Sep 2026297 AMAQI
17th Sep 2026258 AMAQI
17th Sep 2026299 AMAQI
17th Sep 20263310 AMAQI
17th Sep 20262711 AMAQI
17th Sep 20262312 PMAQI
17th Sep 2026211 PMAQI
17th Sep 2026252 PMAQI
17th Sep 2026213 PMAQI
17th Sep 2026214 PMAQI
17th Sep 2026235 PMAQI
17th Sep 2026216 PMAQI
17th Sep 2026277 PMAQI
17th Sep 2026258 PMAQI
17th Sep 2026219 PMAQI
17th Sep 20262510 PMAQI
17th Sep 20262511 PMAQI
18th Sep 20262512 AMAQI
18th Sep 2026211 AMAQI
18th Sep 2026212 AMAQI
18th Sep 2026293 AMAQI
18th Sep 2026214 AMAQI

18°C16/22°C

18th Sep 2026215 AMAQI
18th Sep 2026216 AMAQI
18th Sep 2026217 AMAQI
18th Sep 2026258 AMAQI
18th Sep 2026219 AMAQI
18th Sep 20262310 AMAQI
18th Sep 20262911 AMAQI
18th Sep 20262112 PMAQI
18th Sep 2026251 PMAQI
18th Sep 2026252 PMAQI
18th Sep 2026253 PMAQI
18th Sep 2026214 PMAQI
18th Sep 2026215 PMAQI
18th Sep 2026296 PMAQI
18th Sep 2026217 PMAQI
18th Sep 2026238 PMAQI
18th Sep 2026239 PMAQI
18th Sep 20262110 PMAQI
18th Sep 20262111 PMAQI
19th Sep 20262112 AMAQI
19th Sep 2026231 AMAQI
19th Sep 2026212 AMAQI
19th Sep 2026213 AMAQI
19th Sep 2026254 AMAQI

20°C16/26°C

19th Sep 2026215 AMAQI
19th Sep 2026216 AMAQI
19th Sep 2026217 AMAQI
19th Sep 2026218 AMAQI
19th Sep 2026219 AMAQI
19th Sep 20262110 AMAQI
19th Sep 20262111 AMAQI
19th Sep 20263312 PMAQI
19th Sep 2026231 PMAQI
19th Sep 2026212 PMAQI
19th Sep 2026233 PMAQI
19th Sep 2026234 PMAQI
19th Sep 2026215 PMAQI
19th Sep 2026216 PMAQI
19th Sep 2026217 PMAQI
19th Sep 2026218 PMAQI
19th Sep 2026239 PMAQI
19th Sep 20262910 PMAQI
19th Sep 20262311 PMAQI
20th Sep 20262912 AMAQI
20th Sep 2026291 AMAQI
20th Sep 2026252 AMAQI
20th Sep 2026253 AMAQI
20th Sep 2026294 AMAQI

21°C17/27°C

20th Sep 2026295 AMAQI
20th Sep 2026296 AMAQI
20th Sep 2026317 AMAQI
20th Sep 2026338 AMAQI
20th Sep 2026299 AMAQI
20th Sep 20262910 AMAQI
20th Sep 20262511 AMAQI
20th Sep 20262512 PMAQI
20th Sep 2026211 PMAQI
20th Sep 2026252 PMAQI
20th Sep 2026253 PMAQI
20th Sep 2026254 PMAQI
20th Sep 2026255 PMAQI
20th Sep 2026256 PMAQI
20th Sep 2026257 PMAQI
20th Sep 2026298 PMAQI
20th Sep 2026239 PMAQI
20th Sep 20262510 PMAQI
20th Sep 20262511 PMAQI
21st Sep 20262512 AMAQI
21st Sep 2026251 AMAQI
21st Sep 2026252 AMAQI
21st Sep 2026253 AMAQI
21st Sep 2026234 AMAQI

21°C19/24°C

21st Sep 2026255 AMAQI
21st Sep 2026236 AMAQI
21st Sep 2026257 AMAQI
21st Sep 2026278 AMAQI
21st Sep 2026259 AMAQI
21st Sep 20262510 AMAQI
21st Sep 20262911 AMAQI
21st Sep 20262512 PMAQI
21st Sep 2026291 PMAQI
21st Sep 2026252 PMAQI
21st Sep 2026293 PMAQI
21st Sep 2026254 PMAQI
21st Sep 2026215 PMAQI
21st Sep 2026256 PMAQI
21st Sep 2026237 PMAQI
21st Sep 2026258 PMAQI
21st Sep 2026219 PMAQI
21st Sep 20262510 PMAQI
21st Sep 20262511 PMAQI
22nd Sep 20262512 AMAQI
22nd Sep 2026271 AMAQI
22nd Sep 2026482 AMAQI
22nd Sep 2026593 AMAQI
22nd Sep 2026544 AMAQI

20°C20/21°C

22nd Sep 2026535 AMAQI
22nd Sep 2026276 AMAQI
22nd Sep 2026277 AMAQI
22nd Sep 2026298 AMAQI
22nd Sep 2026299 AMAQI
22nd Sep 20266210 AMAQI
22nd Sep 20262111 AMAQI
22nd Sep 20262712 PMAQI
22nd Sep 2026231 PMAQI
22nd Sep 2026212 PMAQI
22nd Sep 2026273 PMAQI
22nd Sep 2026294 PMAQI
22nd Sep 2026275 PMAQI
22nd Sep 2026276 PMAQI
22nd Sep 2026257 PMAQI
22nd Sep 2026258 PMAQI
22nd Sep 2026259 PMAQI
22nd Sep 20262510 PMAQI
22nd Sep 20262511 PMAQI
23rd Sep 20262712 AMAQI
23rd Sep 2026271 AMAQI
23rd Sep 2026272 AMAQI
23rd Sep 2026273 AMAQI
23rd Sep 2026254 AMAQI

18°C15/21°C

23rd Sep 2026255 AMAQI
23rd Sep 2026256 AMAQI
23rd Sep 2026257 AMAQI
23rd Sep 2026258 AMAQI
23rd Sep 2026239 AMAQI
23rd Sep 20262310 AMAQI
23rd Sep 20262111 AMAQI
23rd Sep 20262312 PMAQI
23rd Sep 2026211 PMAQI
23rd Sep 2026232 PMAQI
23rd Sep 2026253 PMAQI
23rd Sep 2026234 PMAQI
23rd Sep 2026255 PMAQI
23rd Sep 2026236 PMAQI
23rd Sep 2026237 PMAQI
23rd Sep 2026218 PMAQI
23rd Sep 2026219 PMAQI
23rd Sep 20262310 PMAQI
23rd Sep 20262111 PMAQI
24th Sep 20262112 AMAQI
24th Sep 2026211 AMAQI
24th Sep 2026212 AMAQI
24th Sep 2026213 AMAQI
24th Sep 2026214 AMAQI

19°C14/25°C

24th Sep 2026215 AMAQI
24th Sep 2026216 AMAQI
24th Sep 2026217 AMAQI
24th Sep 2026218 AMAQI
24th Sep 2026219 AMAQI
24th Sep 20262110 AMAQI
24th Sep 20262511 AMAQI
24th Sep 20262112 PMAQI
24th Sep 2026211 PMAQI
24th Sep 2026212 PMAQI
24th Sep 2026213 PMAQI
24th Sep 2026254 PMAQI
24th Sep 2026235 PMAQI
24th Sep 2026236 PMAQI
24th Sep 2026237 PMAQI
24th Sep 2026218 PMAQI
24th Sep 2026219 PMAQI
24th Sep 20262310 PMAQI
24th Sep 20262111 PMAQI
25th Sep 20262112 AMAQI
25th Sep 2026211 AMAQI
25th Sep 2026212 AMAQI
25th Sep 2026213 AMAQI
25th Sep 2026214 AMAQI

18°C16/19°C

25th Sep 2026275 AMAQI
25th Sep 2026216 AMAQI
25th Sep 2026307 AMAQI
25th Sep 2026218 AMAQI
25th Sep 2026219 AMAQI
25th Sep 20262510 AMAQI
25th Sep 20262911 AMAQI
25th Sep 20262512 PMAQI
25th Sep 2026211 PMAQI
25th Sep 2026292 PMAQI
25th Sep 2026253 PMAQI
25th Sep 2026234 PMAQI
25th Sep 2026255 PMAQI
25th Sep 2026236 PMAQI
25th Sep 2026217 PMAQI
25th Sep 2026338 PMAQI
25th Sep 2026219 PMAQI
25th Sep 20262110 PMAQI
25th Sep 20262111 PMAQI
26th Sep 20262112 AMAQI
26th Sep 2026211 AMAQI
26th Sep 2026252 AMAQI
26th Sep 2026213 AMAQI
26th Sep 2026214 AMAQI

18°C15/22°C

26th Sep 2026215 AMAQI
26th Sep 2026216 AMAQI
26th Sep 2026217 AMAQI
26th Sep 2026238 AMAQI
26th Sep 2026219 AMAQI
26th Sep 20262110 AMAQI
26th Sep 20263011 AMAQI
26th Sep 20262112 PMAQI
26th Sep 2026211 PMAQI
26th Sep 2026212 PMAQI
26th Sep 2026253 PMAQI
26th Sep 2026274 PMAQI
26th Sep 2026295 PMAQI
26th Sep 2026216 PMAQI
26th Sep 2026217 PMAQI
26th Sep 2026218 PMAQI
26th Sep 2026219 PMAQI
26th Sep 20262310 PMAQI
26th Sep 20262111 PMAQI
27th Sep 20262112 AMAQI
27th Sep 2026211 AMAQI
27th Sep 2026212 AMAQI
27th Sep 2026253 AMAQI
27th Sep 2026214 AMAQI

15°C13/16°C

27th Sep 2026255 AMAQI
27th Sep 2026276 AMAQI
27th Sep 2026257 AMAQI
27th Sep 2026238 AMAQI
27th Sep 2026299 AMAQI
27th Sep 20262310 AMAQI
27th Sep 20262311 AMAQI
27th Sep 20262112 PMAQI
27th Sep 2026231 PMAQI
27th Sep 2026252 PMAQI
27th Sep 2026213 PMAQI
27th Sep 2026254 PMAQI
27th Sep 2026235 PMAQI
27th Sep 2026256 PMAQI
27th Sep 2026217 PMAQI
27th Sep 2026218 PMAQI
27th Sep 2026219 PMAQI
27th Sep 20262310 PMAQI
27th Sep 20262311 PMAQI
28th Sep 20262512 AMAQI
28th Sep 2026211 AMAQI
28th Sep 2026232 AMAQI
28th Sep 2026233 AMAQI
28th Sep 2026254 AMAQI

18°C16/22°C

28th Sep 2026255 AMAQI
28th Sep 2026236 AMAQI
28th Sep 2026237 AMAQI
28th Sep 2026258 AMAQI
28th Sep 2026219 AMAQI
28th Sep 20262310 AMAQI
28th Sep 20262111 AMAQI
28th Sep 20262112 PMAQI
28th Sep 2026211 PMAQI
28th Sep 2026272 PMAQI
28th Sep 2026293 PMAQI
28th Sep 2026254 PMAQI
28th Sep 2026275 PMAQI
28th Sep 2026276 PMAQI
28th Sep 2026297 PMAQI
28th Sep 2026278 PMAQI
28th Sep 2026279 PMAQI
28th Sep 20262910 PMAQI
28th Sep 20262711 PMAQI
29th Sep 20262712 AMAQI
29th Sep 2026271 AMAQI
29th Sep 2026252 AMAQI
29th Sep 2026293 AMAQI
29th Sep 2026294 AMAQI

18°C17/20°C

29th Sep 2026295 AMAQI
29th Sep 2026256 AMAQI
29th Sep 2026337 AMAQI
29th Sep 2026278 AMAQI
29th Sep 2026259 AMAQI
29th Sep 20262510 AMAQI
29th Sep 20262511 AMAQI
29th Sep 20262512 PMAQI
29th Sep 2026271 PMAQI
29th Sep 2026232 PMAQI
29th Sep 2026233 PMAQI
29th Sep 2026234 PMAQI
29th Sep 2026255 PMAQI
29th Sep 2026256 PMAQI
29th Sep 2026297 PMAQI
29th Sep 2026298 PMAQI
29th Sep 2026299 PMAQI
29th Sep 20262510 PMAQI
29th Sep 20262511 PMAQI
30th Sep 20262512 AMAQI
30th Sep 2026251 AMAQI
30th Sep 2026272 AMAQI
30th Sep 2026273 AMAQI
30th Sep 2026274 AMAQI

15°C13/17°C

30th Sep 2026255 AMAQI
30th Sep 2026256 AMAQI
30th Sep 2026257 AMAQI
30th Sep 2026258 AMAQI
30th Sep 2026239 AMAQI
30th Sep 20262510 AMAQI
30th Sep 20262511 AMAQI
30th Sep 20262512 PMAQI
30th Sep 2026251 PMAQI
30th Sep 2026252 PMAQI
30th Sep 2026213 PMAQI
30th Sep 2026214 PMAQI
30th Sep 2026255 PMAQI
30th Sep 2026256 PMAQI
30th Sep 2026257 PMAQI
30th Sep 2026278 PMAQI
30th Sep 2026239 PMAQI
30th Sep 20262110 PMAQI
30th Sep 20262111 PMAQI
1st Oct 20262112 AMAQI
1st Oct 2026211 AMAQI
1st Oct 2026212 AMAQI
1st Oct 2026233 AMAQI
1st Oct 2026254 AMAQI

16°C12/22°C

1st Oct 2026235 AMAQI
1st Oct 2026236 AMAQI
1st Oct 2026257 AMAQI
1st Oct 2026238 AMAQI
1st Oct 2026239 AMAQI
1st Oct 20262310 AMAQI
1st Oct 20262111 AMAQI
1st Oct 20262312 PMAQI
1st Oct 2026231 PMAQI
1st Oct 2026232 PMAQI
1st Oct 2026233 PMAQI
1st Oct 2026234 PMAQI
1st Oct 2026235 PMAQI
1st Oct 2026216 PMAQI
1st Oct 2026257 PMAQI
1st Oct 2026258 PMAQI
1st Oct 2026279 PMAQI
1st Oct 20262510 PMAQI
1st Oct 20262511 PMAQI
2nd Oct 20262312 AMAQI
2nd Oct 2026311 AMAQI
2nd Oct 2026292 AMAQI
2nd Oct 2026253 AMAQI
2nd Oct 2026254 AMAQI

17°C15/21°C

2nd Oct 2026235 AMAQI
2nd Oct 2026256 AMAQI
2nd Oct 2026237 AMAQI
2nd Oct 2026218 AMAQI
2nd Oct 2026219 AMAQI
2nd Oct 20262110 AMAQI
2nd Oct 20262711 AMAQI
2nd Oct 20262512 PMAQI
2nd Oct 2026301 PMAQI
2nd Oct 2026402 PMAQI
2nd Oct 2026253 PMAQI
2nd Oct 2026294 PMAQI
2nd Oct 2026275 PMAQI
2nd Oct 2026276 PMAQI
2nd Oct 2026297 PMAQI
2nd Oct 2026278 PMAQI
2nd Oct 2026259 PMAQI
2nd Oct 20262510 PMAQI
2nd Oct 20262311 PMAQI
3rd Oct 20262512 AMAQI
3rd Oct 2026251 AMAQI
3rd Oct 2026252 AMAQI
3rd Oct 2026273 AMAQI
3rd Oct 2026254 AMAQI

14°C12/17°C

3rd Oct 2026255 AMAQI
3rd Oct 2026256 AMAQI
3rd Oct 2026257 AMAQI
3rd Oct 2026258 AMAQI
3rd Oct 2026259 AMAQI
3rd Oct 20262510 AMAQI
3rd Oct 20262311 AMAQI
3rd Oct 20262312 PMAQI
3rd Oct 2026211 PMAQI
3rd Oct 2026212 PMAQI
3rd Oct 2026253 PMAQI
3rd Oct 2026234 PMAQI
3rd Oct 2026445 PMAQI
3rd Oct 2026406 PMAQI
3rd Oct 2026257 PMAQI
3rd Oct 2026238 PMAQI
3rd Oct 2026279 PMAQI
3rd Oct 20262510 PMAQI
3rd Oct 20262511 PMAQI
4th Oct 20262312 AMAQI
4th Oct 2026231 AMAQI
4th Oct 2026212 AMAQI
4th Oct 2026253 AMAQI
4th Oct 2026234 AMAQI

14°C9/20°C

4th Oct 2026255 AMAQI
5 AM
4th Oct 2026296 AMAQI
4th Oct 2026257 AMAQI
4th Oct 2026238 AMAQI
4th Oct 2026259 AMAQI
4th Oct 20262510 AMAQI
4th Oct 20262311 AMAQI
11 AM
4th Oct 20262712 PMAQI
4th Oct 2026271 PMAQI
4th Oct 2026272 PMAQI
4th Oct 2026313 PMAQI
4th Oct 2026254 PMAQI
4th Oct 2026335 PMAQI
5 PM
4th Oct 2026316 PMAQI
4th Oct 2026317 PMAQI
4th Oct 2026298 PMAQI
4th Oct 2026259 PMAQI
4th Oct 20262910 PMAQI
4th Oct 20263311 PMAQI
11 PM
4 AM

15°C9/22°C

Day time
Avg. Highest Time
5 AM

26AQI

1 hours / Day
30 hours / Month
Avg. Lowest Time
8 AM - 9 AM

24AQI

2 hours / Day
60 hours / Month
In the last 30 days, during the daytime, the highest AQI was between 5 AM to 5 AM (Avg. 26), while the lowest AQI was between 8 AM to 9 AM (Avg. 24).
Night time
Avg. Highest Time
3 AM

26AQI

1 hours / Day
30 hours / Month
Avg. Lowest Time
12 AM - 1 AM

24AQI

2 hours / Day
60 hours / Month
In the last 30 days, during the daytime, the highest AQI was between 3 AM to 3 AM (Avg. 26), while the lowest AQI was between 12 AM to 1 AM (Avg. 24).

2026 Days Vs Air Quality

Joetsu, Niigata, Japan

2026

87%

239

13%

37

Total number of days with different AQI categories in last 277 days in 2026 (88 days remaining)

Good
239 Days
Moderate
37 Days
Poor
0 Days
Unhealthy
0 Days
Severe
0 Days
Hazardous
0 Days

Under WHO’s Safe Air Quality Limits: 87%

Health Risk Level:

Low

In 2026, 87% of 277 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

Joetsu, Niigata, Japan

AQI levels in 2026

AQI (US)
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 2026
-1th undefined 2026
-1th undefined 2026
-1th undefined 2026
1st January 2026
19AQI (US)
2nd January 2026
23AQI (US)
3rd January 2026
27AQI (US)
4th January 2026
34AQI (US)
5th January 2026
28AQI (US)
6th January 2026
26AQI (US)
7th January 2026
26AQI (US)
8th January 2026
29AQI (US)
9th January 2026
28AQI (US)
10th January 2026
31AQI (US)
11th January 2026
27AQI (US)
12th January 2026
28AQI (US)
13th January 2026
29AQI (US)
14th January 2026
21AQI (US)
15th January 2026
32AQI (US)
16th January 2026
52AQI (US)
17th January 2026
45AQI (US)
18th January 2026
33AQI (US)
19th January 2026
47AQI (US)
20th January 2026
30AQI (US)
21st January 2026
21AQI (US)
22nd January 2026
23AQI (US)
23rd January 2026
34AQI (US)
24th January 2026
33AQI (US)
25th January 2026
43AQI (US)
26th January 2026
27AQI (US)
27th January 2026
35AQI (US)
28th January 2026
31AQI (US)
29th January 2026
27AQI (US)
30th January 2026
38AQI (US)
31st January 2026
41AQI (US)
1st February 2026
32AQI (US)
2nd February 2026
35AQI (US)
3rd February 2026
31AQI (US)
4th February 2026
35AQI (US)
5th February 2026
41AQI (US)
6th February 2026
42AQI (US)
7th February 2026
23AQI (US)
8th February 2026
13AQI (US)
9th February 2026
35AQI (US)
10th February 2026
41AQI (US)
11th February 2026
48AQI (US)
12th February 2026
40AQI (US)
13th February 2026
45AQI (US)
14th February 2026
61AQI (US)
15th February 2026
55AQI (US)
16th February 2026
50AQI (US)
17th February 2026
19AQI (US)
18th February 2026
31AQI (US)
19th February 2026
31AQI (US)
20th February 2026
33AQI (US)
21st February 2026
44AQI (US)
22nd February 2026
43AQI (US)
23rd February 2026
54AQI (US)
24th February 2026
44AQI (US)
25th February 2026
24AQI (US)
26th February 2026
11AQI (US)
27th February 2026
43AQI (US)
28th February 2026
37AQI (US)
1st March 2026
38AQI (US)
2nd March 2026
71AQI (US)
3rd March 2026
41AQI (US)
4th March 2026
14AQI (US)
5th March 2026
62AQI (US)
6th March 2026
54AQI (US)
7th March 2026
46AQI (US)
8th March 2026
45AQI (US)
9th March 2026
50AQI (US)
10th March 2026
56AQI (US)
11th March 2026
56AQI (US)
12th March 2026
63AQI (US)
13th March 2026
34AQI (US)
14th March 2026
48AQI (US)
15th March 2026
59AQI (US)
16th March 2026
56AQI (US)
17th March 2026
56AQI (US)
18th March 2026
43AQI (US)
19th March 2026
34AQI (US)
20th March 2026
39AQI (US)
21st March 2026
59AQI (US)
22nd March 2026
47AQI (US)
23rd March 2026
51AQI (US)
24th March 2026
72AQI (US)
25th March 2026
51AQI (US)
26th March 2026
22AQI (US)
27th March 2026
22AQI (US)
28th March 2026
54AQI (US)
29th March 2026
59AQI (US)
30th March 2026
63AQI (US)
31st March 2026
42AQI (US)
1st April 2026
44AQI (US)
2nd April 2026
19AQI (US)
3rd April 2026
40AQI (US)
4th April 2026
46AQI (US)
5th April 2026
33AQI (US)
6th April 2026
26AQI (US)
7th April 2026
31AQI (US)
8th April 2026
29AQI (US)
9th April 2026
30AQI (US)
10th April 2026
43AQI (US)
11th April 2026
41AQI (US)
12th April 2026
30AQI (US)
13th April 2026
30AQI (US)
14th April 2026
38AQI (US)
15th April 2026
51AQI (US)
16th April 2026
29AQI (US)
17th April 2026
30AQI (US)
18th April 2026
36AQI (US)
19th April 2026
33AQI (US)
20th April 2026
36AQI (US)
21st April 2026
44AQI (US)
22nd April 2026
27AQI (US)
23rd April 2026
21AQI (US)
24th April 2026
32AQI (US)
25th April 2026
45AQI (US)
26th April 2026
51AQI (US)
27th April 2026
50AQI (US)
28th April 2026
41AQI (US)
29th April 2026
40AQI (US)
30th April 2026
39AQI (US)
1st May 2026
47AQI (US)
2nd May 2026
54AQI (US)
3rd May 2026
45AQI (US)
4th May 2026
25AQI (US)
5th May 2026
29AQI (US)
6th May 2026
29AQI (US)
7th May 2026
31AQI (US)
8th May 2026
26AQI (US)
9th May 2026
26AQI (US)
10th May 2026
28AQI (US)
11th May 2026
31AQI (US)
12th May 2026
36AQI (US)
13th May 2026
39AQI (US)
14th May 2026
33AQI (US)
15th May 2026
34AQI (US)
16th May 2026
82AQI (US)
17th May 2026
67AQI (US)
18th May 2026
53AQI (US)
19th May 2026
48AQI (US)
20th May 2026
61AQI (US)
21st May 2026
61AQI (US)
22nd May 2026
61AQI (US)
23rd May 2026
55AQI (US)
24th May 2026
59AQI (US)
25th May 2026
50AQI (US)
26th May 2026
41AQI (US)
27th May 2026
52AQI (US)
28th May 2026
28AQI (US)
29th May 2026
19AQI (US)
30th May 2026
24AQI (US)
31st May 2026
29AQI (US)
1st June 2026
45AQI (US)
2nd June 2026
46AQI (US)
3rd June 2026
21AQI (US)
4th June 2026
17AQI (US)
5th June 2026
21AQI (US)
6th June 2026
24AQI (US)
7th June 2026
22AQI (US)
8th June 2026
21AQI (US)
9th June 2026
22AQI (US)
10th June 2026
21AQI (US)
11th June 2026
24AQI (US)
12th June 2026
24AQI (US)
13th June 2026
26AQI (US)
14th June 2026
23AQI (US)
15th June 2026
22AQI (US)
16th June 2026
26AQI (US)
17th June 2026
25AQI (US)
18th June 2026
26AQI (US)
19th June 2026
29AQI (US)
20th June 2026
22AQI (US)
21st June 2026
19AQI (US)
22nd June 2026
18AQI (US)
23rd June 2026
20AQI (US)
24th June 2026
20AQI (US)
25th June 2026
26AQI (US)
26th June 2026
29AQI (US)
27th June 2026
26AQI (US)
28th June 2026
27AQI (US)
29th June 2026
25AQI (US)
30th June 2026
23AQI (US)
1st July 2026
23AQI (US)
2nd July 2026
21AQI (US)
3rd July 2026
22AQI (US)
4th July 2026
25AQI (US)
5th July 2026
22AQI (US)
6th July 2026
19AQI (US)
7th July 2026
16AQI (US)
8th July 2026
24AQI (US)
9th July 2026
24AQI (US)
10th July 2026
27AQI (US)
11th July 2026
29AQI (US)
12th July 2026
27AQI (US)
13th July 2026
27AQI (US)
14th July 2026
27AQI (US)
15th July 2026
25AQI (US)
16th July 2026
27AQI (US)
17th July 2026
32AQI (US)
18th July 2026
41AQI (US)
19th July 2026
35AQI (US)
20th July 2026
54AQI (US)
21st July 2026
63AQI (US)
22nd July 2026
63AQI (US)
23rd July 2026
57AQI (US)
24th July 2026
41AQI (US)
25th July 2026
39AQI (US)
26th July 2026
24AQI (US)
27th July 2026
24AQI (US)
28th July 2026
24AQI (US)
29th July 2026
28AQI (US)
30th July 2026
33AQI (US)
31st July 2026
40AQI (US)
1st August 2026
41AQI (US)
2nd August 2026
44AQI (US)
3rd August 2026
39AQI (US)
4th August 2026
31AQI (US)
5th August 2026
33AQI (US)
6th August 2026
43AQI (US)
7th August 2026
51AQI (US)
8th August 2026
46AQI (US)
9th August 2026
26AQI (US)
10th August 2026
25AQI (US)
11th August 2026
24AQI (US)
12th August 2026
21AQI (US)
13th August 2026
21AQI (US)
14th August 2026
21AQI (US)
15th August 2026
27AQI (US)
16th August 2026
24AQI (US)
17th August 2026
25AQI (US)
18th August 2026
27AQI (US)
19th August 2026
25AQI (US)
20th August 2026
24AQI (US)
21st August 2026
25AQI (US)
22nd August 2026
24AQI (US)
23rd August 2026
33AQI (US)
24th August 2026
37AQI (US)
25th August 2026
40AQI (US)
26th August 2026
39AQI (US)
27th August 2026
25AQI (US)
28th August 2026
22AQI (US)
29th August 2026
24AQI (US)
30th August 2026
21AQI (US)
31st August 2026
26AQI (US)
1st September 2026
26AQI (US)
2nd September 2026
24AQI (US)
3rd September 2026
27AQI (US)
4th September 2026
24AQI (US)
5th September 2026
26AQI (US)
6th September 2026
31AQI (US)
7th September 2026
16AQI (US)
8th September 2026
24AQI (US)
9th September 2026
25AQI (US)
10th September 2026
24AQI (US)
11th September 2026
24AQI (US)
12th September 2026
24AQI (US)
13th September 2026
24AQI (US)
14th September 2026
27AQI (US)
15th September 2026
26AQI (US)
16th September 2026
22AQI (US)
17th September 2026
25AQI (US)
18th September 2026
23AQI (US)
19th September 2026
22AQI (US)
20th September 2026
27AQI (US)
21st September 2026
25AQI (US)
22nd September 2026
32AQI (US)
23rd September 2026
24AQI (US)
24th September 2026
22AQI (US)
25th September 2026
24AQI (US)
26th September 2026
22AQI (US)
27th September 2026
23AQI (US)
28th September 2026
25AQI (US)
29th September 2026
26AQI (US)
30th September 2026
24AQI (US)
1st October 2026
23AQI (US)
2nd October 2026
26AQI (US)
3rd October 2026
26AQI (US)
4th October 2026
5th October 2026
6th October 2026
7th October 2026
8th October 2026
9th October 2026
10th October 2026
11th October 2026
12th October 2026
13th October 2026
14th October 2026
15th October 2026
16th October 2026
17th October 2026
18th October 2026
19th October 2026
20th October 2026
21st October 2026
22nd October 2026
23rd October 2026
24th October 2026
25th October 2026
26th October 2026
27th October 2026
28th October 2026
29th October 2026
30th October 2026
31st October 2026
1st November 2026
2nd November 2026
3rd November 2026
4th November 2026
5th November 2026
6th November 2026
7th November 2026
8th November 2026
9th November 2026
10th November 2026
11th November 2026
12th November 2026
13th November 2026
14th November 2026
15th November 2026
16th November 2026
17th November 2026
18th November 2026
19th November 2026
20th November 2026
21st November 2026
22nd November 2026
23rd November 2026
24th November 2026
25th November 2026
26th November 2026
27th November 2026
28th November 2026
29th November 2026
30th November 2026
1st December 2026
2nd December 2026
3rd December 2026
4th December 2026
5th December 2026
6th December 2026
7th December 2026
8th December 2026
9th December 2026
10th December 2026
11th December 2026
12th December 2026
13th December 2026
14th December 2026
15th December 2026
16th December 2026
17th December 2026
18th December 2026
19th December 2026
20th December 2026
21st December 2026
22nd December 2026
23rd December 2026
24th December 2026
25th December 2026
26th December 2026
27th December 2026
28th December 2026
29th December 2026
30th December 2026
31st December 2026

31AQI (US)

37AQI (US)

49AQI (US)

36AQI (US)

42AQI (US)

25AQI (US)

32AQI (US)

30AQI (US)

25AQI (US)

25AQI (US)

No. of days

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

202634AQI (US)

30
1
25
3
15
16
28
2
21
10
30
27
4
30
1
30
3
239
37

Highest AQI (US) recorded in

March

49AQI (US)

Lowest AQI (US) recorded in

October

25AQI (US)

202541AQI (US)

31
26
2
21
10
28
2
25
6
19
11
22
9
23
8
30
14
17
17
13
25
6
281
84

Highest AQI (US) recorded in

October

50AQI (US)

Lowest AQI (US) recorded in

September

30AQI (US)

202439AQI (US)

29
29
25
6
16
14
25
6
12
18
26
5
27
4
30
30
1
28
2
31
308
56

Highest AQI (US) recorded in

April

52AQI (US)

Lowest AQI (US) recorded in

December

27AQI (US)

202341AQI (US)

31
27
1
17
14
17
13
19
12
23
7
21
10
28
3
28
2
31
24
4
31
297
66

Highest AQI (US) recorded in

April

50AQI (US)

Lowest AQI (US) recorded in

December

32AQI (US)

202239AQI (US)

29
2
20
1
24
7
19
11
17
14
19
11
20
4
1
25
3
30
1
28
2
31
263
56

Highest AQI (US) recorded in

May

50AQI (US)

Lowest AQI (US) recorded in

December

30AQI (US)

202137AQI (US)

28
2
23
5
25
4
16
5
24
5
2
20
10
27
4
23
8
30
30
1
30
23
299
44
2

Highest AQI (US) recorded in

June

48AQI (US)

Lowest AQI (US) recorded in

December

27AQI (US)

202034AQI (US)

12
1
21
15
3
23
7
28
1
13
16
2
18
1
29
2
26
4
31
216
35
2

Highest AQI (US) recorded in

August

54AQI (US)

Lowest AQI (US) recorded in

December

21AQI (US)

Most & Least Polluted Years Over the Last 7 Years

Most Polluted Year Recorded
2025(Avg.)
41AQI (US)
Least Polluted Year Recorded
2020(Avg.)
34AQI (US)

Joetsu's annual 2026 AQI (US) (34) shows an average percentage change of -11.3% (improved AQI (US)) compared to previous years: 2020 (34), 2021 (37), 2022 (39), 2023 (41), 2024 (39), 2025 (41).