Country Background
HistoryAQIPM₂.₅PM₁₀COSO₂NO₂O₃

Omachi, Nagano, 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+

August Air Quality Analysis

Omachi, Nagano, Japan

2022
2023
2024
2025
2026
AQI
.
Days

AQI Trends: Highest and Lowest

Highest AQI recorded on
26th Aug 2025
56AQI
Lowest AQI recorded on
24th Aug 2023
14AQI

Same Day Analysis (2nd August):
On this day, AQI across the 5 years varied significantly: 2026 ranks 2nd highest AQI at 36 of Good air quality, showing improvement over 2025 on the same day.

Day & Night AQI Trend: 1st Aug - 2nd Aug 2026

Omachi, Nagano, Japan

AQI
Day
Night
.

4 AM1st Aug 2026

7 PM

3 AM2nd Aug 2026

Day time
Avg. Highest Time
4AM1st Aug

40AQI

Avg. Lowest Time
5PM1st Aug

29AQI

Night time
Avg. Highest Time
2AM2nd Aug

33AQI

Avg. Lowest Time
3AM2nd Aug

29AQI

In the last 24 hours,

Omachi's AQI reached its highest point of 40 at 4 AM during the Day, while the lowest point, 29, was recorded at 3 AM during the Night between 1st Aug and 2nd Aug 2026.

Day & Night AQI Trend : Jul - Aug 2026

Omachi, Nagano, Japan

JulAug
04th - 05th05th - 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 - 31st31st - 01st01st - 02nd02nd
Day
Night
4th Jul 2026244 AMAQI
4th Jul 2026255 AMAQI
4th Jul 2026276 AMAQI
4th Jul 2026287 AMAQI
4th Jul 2026288 AMAQI
4th Jul 2026269 AMAQI
4th Jul 20262410 AMAQI
4th Jul 20262611 AMAQI
4th Jul 20262512 PMAQI
4th Jul 2026241 PMAQI
4th Jul 2026242 PMAQI
4th Jul 2026263 PMAQI
4th Jul 2026264 PMAQI
4th Jul 2026265 PMAQI
4th Jul 2026246 PMAQI
4th Jul 2026247 PMAQI
4th Jul 2026278 PMAQI
4th Jul 2026259 PMAQI
4th Jul 20262610 PMAQI
4th Jul 20262511 PMAQI
5th Jul 20262612 AMAQI
5th Jul 2026261 AMAQI
5th Jul 2026242 AMAQI
5th Jul 2026243 AMAQI

16°C10/24°C

5th Jul 2026244 AMAQI
5th Jul 2026245 AMAQI
5th Jul 2026246 AMAQI
5th Jul 2026227 AMAQI
5th Jul 2026238 AMAQI
5th Jul 2026219 AMAQI
5th Jul 20261910 AMAQI
5th Jul 20262111 AMAQI
5th Jul 20261812 PMAQI
5th Jul 2026181 PMAQI
5th Jul 2026202 PMAQI
5th Jul 2026243 PMAQI
5th Jul 2026254 PMAQI
5th Jul 2026245 PMAQI
5th Jul 2026206 PMAQI
5th Jul 202697 PMAQI
5th Jul 2026148 PMAQI
5th Jul 2026139 PMAQI
5th Jul 20261410 PMAQI
5th Jul 20261411 PMAQI
6th Jul 20261012 AMAQI
6th Jul 2026241 AMAQI
6th Jul 2026262 AMAQI
6th Jul 2026203 AMAQI

18°C12/22°C

6th Jul 2026234 AMAQI
6th Jul 2026135 AMAQI
6th Jul 2026186 AMAQI
6th Jul 2026207 AMAQI
6th Jul 2026218 AMAQI
6th Jul 2026189 AMAQI
6th Jul 20262310 AMAQI
6th Jul 20263011 AMAQI
6th Jul 20261712 PMAQI
6th Jul 2026161 PMAQI
6th Jul 2026162 PMAQI
6th Jul 2026143 PMAQI
6th Jul 2026134 PMAQI
6th Jul 2026155 PMAQI
6th Jul 2026156 PMAQI
6th Jul 2026137 PMAQI
6th Jul 2026128 PMAQI
6th Jul 2026159 PMAQI
6th Jul 20261010 PMAQI
6th Jul 20261111 PMAQI
7th Jul 20262812 AMAQI
7th Jul 2026101 AMAQI
7th Jul 202692 AMAQI
7th Jul 2026203 AMAQI

18°C15/20°C

7th Jul 2026254 AMAQI
7th Jul 2026195 AMAQI
7th Jul 2026116 AMAQI
7th Jul 2026267 AMAQI
7th Jul 2026108 AMAQI
7th Jul 2026239 AMAQI
7th Jul 20261710 AMAQI
7th Jul 20262111 AMAQI
7th Jul 20261412 PMAQI
7th Jul 2026201 PMAQI
7th Jul 2026232 PMAQI
7th Jul 2026263 PMAQI
7th Jul 2026254 PMAQI
7th Jul 2026235 PMAQI
7th Jul 2026266 PMAQI
7th Jul 2026277 PMAQI
7th Jul 2026278 PMAQI
7th Jul 2026279 PMAQI
7th Jul 20262810 PMAQI
7th Jul 20262611 PMAQI
8th Jul 20263012 AMAQI
8th Jul 2026301 AMAQI
8th Jul 2026282 AMAQI
8th Jul 2026273 AMAQI

18°C13/24°C

8th Jul 2026284 AMAQI
8th Jul 2026265 AMAQI
8th Jul 2026296 AMAQI
8th Jul 2026267 AMAQI
8th Jul 2026288 AMAQI
8th Jul 2026269 AMAQI
8th Jul 20262810 AMAQI
8th Jul 20262411 AMAQI
8th Jul 20262412 PMAQI
8th Jul 2026221 PMAQI
8th Jul 2026272 PMAQI
8th Jul 2026263 PMAQI
8th Jul 2026294 PMAQI
8th Jul 2026245 PMAQI
8th Jul 2026246 PMAQI
8th Jul 2026207 PMAQI
8th Jul 2026208 PMAQI
8th Jul 2026239 PMAQI
8th Jul 20262610 PMAQI
8th Jul 20262611 PMAQI
9th Jul 20263012 AMAQI
9th Jul 2026291 AMAQI
9th Jul 2026282 AMAQI
9th Jul 2026283 AMAQI

19°C11/26°C

9th Jul 2026264 AMAQI
9th Jul 2026285 AMAQI
9th Jul 2026246 AMAQI
9th Jul 2026287 AMAQI
9th Jul 2026258 AMAQI
9th Jul 2026249 AMAQI
9th Jul 20262410 AMAQI
9th Jul 20262511 AMAQI
9th Jul 20262512 PMAQI
9th Jul 2026201 PMAQI
9th Jul 2026222 PMAQI
9th Jul 2026283 PMAQI
9th Jul 2026264 PMAQI
9th Jul 2026265 PMAQI
9th Jul 2026266 PMAQI
9th Jul 2026297 PMAQI
9th Jul 2026288 PMAQI
9th Jul 2026259 PMAQI
9th Jul 20262810 PMAQI
9th Jul 20262411 PMAQI
10th Jul 20262612 AMAQI
10th Jul 2026281 AMAQI
10th Jul 2026262 AMAQI
10th Jul 2026283 AMAQI

20°C13/28°C

10th Jul 2026264 AMAQI
10th Jul 2026295 AMAQI
10th Jul 2026276 AMAQI
10th Jul 2026267 AMAQI
10th Jul 2026288 AMAQI
10th Jul 2026309 AMAQI
10th Jul 20262810 AMAQI
10th Jul 20262911 AMAQI
10th Jul 20262912 PMAQI
10th Jul 2026241 PMAQI
10th Jul 2026272 PMAQI
10th Jul 2026313 PMAQI
10th Jul 2026304 PMAQI
10th Jul 2026305 PMAQI
10th Jul 2026306 PMAQI
10th Jul 2026317 PMAQI
10th Jul 2026308 PMAQI
10th Jul 2026329 PMAQI
10th Jul 20262910 PMAQI
10th Jul 20263411 PMAQI
11th Jul 20263412 AMAQI
11th Jul 2026331 AMAQI
11th Jul 2026302 AMAQI
11th Jul 2026283 AMAQI

21°C14/30°C

11th Jul 2026284 AMAQI
11th Jul 2026325 AMAQI
11th Jul 2026306 AMAQI
11th Jul 2026327 AMAQI
11th Jul 2026328 AMAQI
11th Jul 2026329 AMAQI
11th Jul 20263410 AMAQI
11th Jul 20262811 AMAQI
11th Jul 20262812 PMAQI
11th Jul 2026241 PMAQI
11th Jul 2026252 PMAQI
11th Jul 2026753 PMAQI
11th Jul 2026744 PMAQI
11th Jul 2026715 PMAQI
11th Jul 2026676 PMAQI
11th Jul 2026787 PMAQI
11th Jul 2026748 PMAQI
11th Jul 2026719 PMAQI
11th Jul 20266410 PMAQI
11th Jul 20264011 PMAQI
12th Jul 20263112 AMAQI
12th Jul 2026421 AMAQI
12th Jul 2026382 AMAQI
12th Jul 2026383 AMAQI

20°C15/26°C

12th Jul 2026334 AMAQI
12th Jul 2026215 AMAQI
12th Jul 2026296 AMAQI
12th Jul 2026407 AMAQI
12th Jul 2026338 AMAQI
12th Jul 2026209 AMAQI
12th Jul 20262010 AMAQI
12th Jul 20262311 AMAQI
12th Jul 20262212 PMAQI
12th Jul 2026271 PMAQI
12th Jul 2026312 PMAQI
12th Jul 2026293 PMAQI
12th Jul 2026274 PMAQI
12th Jul 2026295 PMAQI
12th Jul 2026266 PMAQI
12th Jul 2026287 PMAQI
12th Jul 2026318 PMAQI
12th Jul 2026309 PMAQI
12th Jul 20262810 PMAQI
12th Jul 20262911 PMAQI
13th Jul 20262812 AMAQI
13th Jul 2026261 AMAQI
13th Jul 2026272 AMAQI
13th Jul 2026283 AMAQI

18°C14/27°C

13th Jul 2026264 AMAQI
13th Jul 2026285 AMAQI
13th Jul 2026256 AMAQI
13th Jul 2026247 AMAQI
13th Jul 2026288 AMAQI
13th Jul 2026289 AMAQI
13th Jul 20262710 AMAQI
13th Jul 20262311 AMAQI
13th Jul 20262612 PMAQI
13th Jul 2026201 PMAQI
13th Jul 2026192 PMAQI
13th Jul 2026213 PMAQI
13th Jul 2026224 PMAQI
13th Jul 2026305 PMAQI
13th Jul 2026306 PMAQI
13th Jul 2026307 PMAQI
13th Jul 2026308 PMAQI
13th Jul 2026289 PMAQI
13th Jul 20263110 PMAQI
13th Jul 20263411 PMAQI
14th Jul 20263612 AMAQI
14th Jul 2026321 AMAQI
14th Jul 2026302 AMAQI
14th Jul 2026293 AMAQI

18°C14/23°C

14th Jul 2026264 AMAQI
14th Jul 2026295 AMAQI
14th Jul 2026286 AMAQI
14th Jul 2026277 AMAQI
14th Jul 2026288 AMAQI
14th Jul 2026309 AMAQI
14th Jul 20262910 AMAQI
14th Jul 20262611 AMAQI
14th Jul 20262212 PMAQI
14th Jul 2026201 PMAQI
14th Jul 2026222 PMAQI
14th Jul 2026203 PMAQI
14th Jul 2026224 PMAQI
14th Jul 2026295 PMAQI
14th Jul 2026306 PMAQI
14th Jul 2026307 PMAQI
14th Jul 2026308 PMAQI
14th Jul 2026289 PMAQI
14th Jul 20262910 PMAQI
14th Jul 20263011 PMAQI
15th Jul 20263412 AMAQI
15th Jul 2026311 AMAQI
15th Jul 2026302 AMAQI
15th Jul 2026323 AMAQI

21°C14/30°C

15th Jul 2026194 AMAQI
15th Jul 2026285 AMAQI
15th Jul 2026226 AMAQI
15th Jul 2026307 AMAQI
15th Jul 2026108 AMAQI
15th Jul 2026279 AMAQI
15th Jul 20262810 AMAQI
15th Jul 20262411 AMAQI
15th Jul 20262412 PMAQI
15th Jul 2026191 PMAQI
15th Jul 2026222 PMAQI
15th Jul 2026233 PMAQI
15th Jul 2026254 PMAQI
15th Jul 2026285 PMAQI
15th Jul 2026276 PMAQI
15th Jul 2026277 PMAQI
15th Jul 2026288 PMAQI
15th Jul 2026279 PMAQI
15th Jul 20263010 PMAQI
15th Jul 20262711 PMAQI
16th Jul 20262812 AMAQI
16th Jul 2026281 AMAQI
16th Jul 2026302 AMAQI
16th Jul 2026303 AMAQI

22°C14/32°C

16th Jul 2026304 AMAQI
16th Jul 2026305 AMAQI
16th Jul 2026306 AMAQI
16th Jul 2026287 AMAQI
16th Jul 2026308 AMAQI
16th Jul 2026329 AMAQI
16th Jul 20263410 AMAQI
16th Jul 20262811 AMAQI
16th Jul 20263012 PMAQI
16th Jul 2026261 PMAQI
16th Jul 2026242 PMAQI
16th Jul 2026223 PMAQI
16th Jul 2026244 PMAQI
16th Jul 2026575 PMAQI
16th Jul 2026586 PMAQI
16th Jul 2026527 PMAQI
16th Jul 2026428 PMAQI
16th Jul 2026529 PMAQI
16th Jul 20265510 PMAQI
16th Jul 20265311 PMAQI
17th Jul 20262712 AMAQI
17th Jul 2026291 AMAQI
17th Jul 2026282 AMAQI
17th Jul 2026303 AMAQI

21°C16/27°C

17th Jul 2026274 AMAQI
17th Jul 2026265 AMAQI
17th Jul 2026266 AMAQI
17th Jul 2026287 AMAQI
17th Jul 2026258 AMAQI
17th Jul 2026259 AMAQI
17th Jul 20263010 AMAQI
17th Jul 20262811 AMAQI
17th Jul 20262712 PMAQI
17th Jul 2026301 PMAQI
17th Jul 2026242 PMAQI
17th Jul 2026263 PMAQI
17th Jul 2026514 PMAQI
17th Jul 2026525 PMAQI
17th Jul 2026536 PMAQI
17th Jul 2026527 PMAQI
17th Jul 2026528 PMAQI
17th Jul 2026519 PMAQI
17th Jul 20264910 PMAQI
17th Jul 20265211 PMAQI
18th Jul 20265012 AMAQI
18th Jul 2026481 AMAQI
18th Jul 2026462 AMAQI
18th Jul 2026443 AMAQI

21°C16/27°C

18th Jul 2026444 AMAQI
18th Jul 2026425 AMAQI
18th Jul 2026426 AMAQI
18th Jul 2026427 AMAQI
18th Jul 2026468 AMAQI
18th Jul 2026429 AMAQI
18th Jul 20264210 AMAQI
18th Jul 20264011 AMAQI
18th Jul 20264212 PMAQI
18th Jul 2026461 PMAQI
18th Jul 2026482 PMAQI
18th Jul 2026503 PMAQI
18th Jul 2026444 PMAQI
18th Jul 2026405 PMAQI
18th Jul 2026366 PMAQI
18th Jul 2026367 PMAQI
18th Jul 2026338 PMAQI
18th Jul 2026319 PMAQI
18th Jul 20262410 PMAQI
18th Jul 20261011 PMAQI
19th Jul 2026812 AMAQI
19th Jul 2026101 AMAQI
19th Jul 2026162 AMAQI
19th Jul 2026183 AMAQI

20°C15/26°C

19th Jul 2026134 AMAQI
19th Jul 2026155 AMAQI
19th Jul 2026236 AMAQI
19th Jul 2026197 AMAQI
19th Jul 2026128 AMAQI
19th Jul 202699 AMAQI
19th Jul 20261110 AMAQI
19th Jul 20262511 AMAQI
19th Jul 20263612 PMAQI
19th Jul 2026531 PMAQI
19th Jul 2026522 PMAQI
19th Jul 2026553 PMAQI
19th Jul 2026494 PMAQI
19th Jul 2026475 PMAQI
19th Jul 2026546 PMAQI
19th Jul 2026587 PMAQI
19th Jul 2026508 PMAQI
19th Jul 2026449 PMAQI
19th Jul 20264010 PMAQI
19th Jul 20264011 PMAQI
20th Jul 20264012 AMAQI
20th Jul 2026341 AMAQI
20th Jul 2026402 AMAQI
20th Jul 2026573 AMAQI

21°C15/28°C

20th Jul 2026534 AMAQI
20th Jul 2026485 AMAQI
20th Jul 2026466 AMAQI
20th Jul 2026467 AMAQI
20th Jul 2026468 AMAQI
20th Jul 2026489 AMAQI
20th Jul 20264610 AMAQI
20th Jul 20265311 AMAQI
20th Jul 20265212 PMAQI
20th Jul 2026531 PMAQI
20th Jul 2026542 PMAQI
20th Jul 2026533 PMAQI
20th Jul 2026584 PMAQI
20th Jul 2026585 PMAQI
20th Jul 2026686 PMAQI
20th Jul 2026667 PMAQI
20th Jul 2026608 PMAQI
20th Jul 2026769 PMAQI
20th Jul 20266910 PMAQI
20th Jul 20266211 PMAQI
21st Jul 20265512 AMAQI
21st Jul 2026541 AMAQI
21st Jul 2026602 AMAQI
21st Jul 2026683 AMAQI

22°C16/28°C

21st Jul 2026644 AMAQI
21st Jul 2026565 AMAQI
21st Jul 2026656 AMAQI
21st Jul 2026667 AMAQI
21st Jul 2026678 AMAQI
21st Jul 2026639 AMAQI
21st Jul 20266010 AMAQI
21st Jul 20266411 AMAQI
21st Jul 2026651 PMAQI
21st Jul 2026602 PMAQI
21st Jul 2026623 PMAQI
21st Jul 2026644 PMAQI
21st Jul 2026645 PMAQI
21st Jul 2026646 PMAQI
21st Jul 2026997 PMAQI
21st Jul 2026678 PMAQI
21st Jul 2026669 PMAQI
21st Jul 20266910 PMAQI
21st Jul 20266911 PMAQI
22nd Jul 20266912 AMAQI
22nd Jul 2026691 AMAQI
22nd Jul 2026682 AMAQI
22nd Jul 2026693 AMAQI

22°C15/29°C

22nd Jul 2026674 AMAQI
22nd Jul 2026685 AMAQI
22nd Jul 2026676 AMAQI
22nd Jul 2026647 AMAQI
22nd Jul 2026698 AMAQI
22nd Jul 2026699 AMAQI
22nd Jul 20267210 AMAQI
22nd Jul 20267611 AMAQI
22nd Jul 20267212 PMAQI
22nd Jul 2026681 PMAQI
22nd Jul 2026742 PMAQI
22nd Jul 2026743 PMAQI
22nd Jul 2026754 PMAQI
22nd Jul 2026735 PMAQI
22nd Jul 2026846 PMAQI
22nd Jul 2026757 PMAQI
22nd Jul 2026868 PMAQI
22nd Jul 2026569 PMAQI
22nd Jul 20265010 PMAQI
22nd Jul 20264311 PMAQI
23rd Jul 20264012 AMAQI
23rd Jul 2026401 AMAQI
23rd Jul 2026422 AMAQI
23rd Jul 2026383 AMAQI

22°C15/31°C

23rd Jul 2026314 AMAQI
23rd Jul 2026295 AMAQI
23rd Jul 2026316 AMAQI
23rd Jul 2026247 AMAQI
23rd Jul 2026228 AMAQI
23rd Jul 2026229 AMAQI
23rd Jul 20262110 AMAQI
23rd Jul 20262211 AMAQI
23rd Jul 20263412 PMAQI
23rd Jul 2026361 PMAQI
23rd Jul 2026362 PMAQI
23rd Jul 2026553 PMAQI
23rd Jul 2026554 PMAQI
23rd Jul 2026485 PMAQI
23rd Jul 2026536 PMAQI
23rd Jul 2026527 PMAQI
23rd Jul 2026448 PMAQI
23rd Jul 2026429 PMAQI
23rd Jul 20263610 PMAQI
23rd Jul 20262811 PMAQI
24th Jul 20262812 AMAQI
24th Jul 2026271 AMAQI
24th Jul 2026202 AMAQI
24th Jul 2026163 AMAQI

22°C14/30°C

24th Jul 2026204 AMAQI
24th Jul 2026205 AMAQI
24th Jul 2026176 AMAQI
24th Jul 2026157 AMAQI
24th Jul 2026168 AMAQI
24th Jul 2026169 AMAQI
24th Jul 20261810 AMAQI
24th Jul 20264011 AMAQI
24th Jul 20264812 PMAQI
24th Jul 2026481 PMAQI
24th Jul 2026362 PMAQI
24th Jul 2026293 PMAQI
24th Jul 2026384 PMAQI
24th Jul 2026485 PMAQI
24th Jul 2026486 PMAQI
24th Jul 2026487 PMAQI
24th Jul 2026298 PMAQI
24th Jul 2026279 PMAQI
24th Jul 20262910 PMAQI
24th Jul 20263111 PMAQI
25th Jul 20263312 AMAQI
25th Jul 2026271 AMAQI
25th Jul 2026292 AMAQI
25th Jul 2026273 AMAQI

21°C14/29°C

25th Jul 2026274 AMAQI
25th Jul 2026275 AMAQI
25th Jul 2026276 AMAQI
25th Jul 2026297 AMAQI
25th Jul 2026258 AMAQI
25th Jul 2026259 AMAQI
25th Jul 20262710 AMAQI
25th Jul 20263111 AMAQI
25th Jul 20263112 PMAQI
25th Jul 2026291 PMAQI
25th Jul 2026312 PMAQI
25th Jul 2026333 PMAQI
25th Jul 2026384 PMAQI
25th Jul 2026365 PMAQI
25th Jul 2026336 PMAQI
25th Jul 2026367 PMAQI
25th Jul 2026318 PMAQI
25th Jul 2026369 PMAQI
25th Jul 20263310 PMAQI
25th Jul 20263311 PMAQI
26th Jul 20263312 AMAQI
26th Jul 2026331 AMAQI
26th Jul 2026312 AMAQI
26th Jul 2026313 AMAQI

21°C14/28°C

26th Jul 2026334 AMAQI
26th Jul 2026315 AMAQI
26th Jul 2026316 AMAQI
26th Jul 2026297 AMAQI
26th Jul 2026278 AMAQI
26th Jul 2026299 AMAQI
26th Jul 20263110 AMAQI
26th Jul 20263111 AMAQI
26th Jul 20262512 PMAQI
26th Jul 2026231 PMAQI
26th Jul 2026212 PMAQI
26th Jul 2026253 PMAQI
26th Jul 2026214 PMAQI
26th Jul 2026235 PMAQI
26th Jul 2026216 PMAQI
26th Jul 2026277 PMAQI
26th Jul 2026328 PMAQI
26th Jul 2026259 PMAQI
26th Jul 20262710 PMAQI
26th Jul 20262311 PMAQI
27th Jul 20262912 AMAQI
27th Jul 2026251 AMAQI
27th Jul 2026292 AMAQI
27th Jul 2026293 AMAQI

18°C13/23°C

27th Jul 2026314 AMAQI
27th Jul 2026295 AMAQI
27th Jul 2026316 AMAQI
27th Jul 2026317 AMAQI
27th Jul 2026318 AMAQI
27th Jul 2026299 AMAQI
27th Jul 20262110 AMAQI
27th Jul 20263311 AMAQI
27th Jul 20262112 PMAQI
27th Jul 2026251 PMAQI
27th Jul 2026382 PMAQI
27th Jul 2026333 PMAQI
27th Jul 2026384 PMAQI
27th Jul 2026335 PMAQI
27th Jul 2026256 PMAQI
27th Jul 2026257 PMAQI
27th Jul 2026278 PMAQI
27th Jul 2026329 PMAQI
27th Jul 20264210 PMAQI
27th Jul 20262111 PMAQI
28th Jul 20263812 AMAQI
28th Jul 2026381 AMAQI
28th Jul 2026252 AMAQI
28th Jul 2026253 AMAQI

19°C13/26°C

28th Jul 2026214 AMAQI
28th Jul 2026255 AMAQI
28th Jul 2026216 AMAQI
28th Jul 2026257 AMAQI
28th Jul 2026338 AMAQI
28th Jul 2026299 AMAQI
28th Jul 20262510 AMAQI
28th Jul 20262511 AMAQI
28th Jul 20262512 PMAQI
28th Jul 2026271 PMAQI
28th Jul 2026252 PMAQI
28th Jul 2026233 PMAQI
28th Jul 2026234 PMAQI
28th Jul 2026235 PMAQI
28th Jul 2026236 PMAQI
28th Jul 2026217 PMAQI
28th Jul 2026218 PMAQI
28th Jul 2026239 PMAQI
28th Jul 20263810 PMAQI
28th Jul 20265511 PMAQI
29th Jul 20263412 AMAQI
29th Jul 2026421 AMAQI
29th Jul 2026332 AMAQI
29th Jul 2026333 AMAQI

18°C13/24°C

29th Jul 2026274 AMAQI
29th Jul 2026295 AMAQI
29th Jul 2026296 AMAQI
29th Jul 2026297 AMAQI
29th Jul 2026278 AMAQI
29th Jul 202689 AMAQI
29th Jul 2026810 AMAQI
29th Jul 2026611 AMAQI
29th Jul 2026612 PMAQI
29th Jul 2026101 PMAQI
29th Jul 202682 PMAQI
29th Jul 2026173 PMAQI
29th Jul 2026334 PMAQI
29th Jul 2026195 PMAQI
29th Jul 2026236 PMAQI
29th Jul 2026387 PMAQI
29th Jul 2026408 PMAQI
29th Jul 2026299 PMAQI
29th Jul 20262510 PMAQI
29th Jul 20263811 PMAQI
30th Jul 20263612 AMAQI
30th Jul 2026331 AMAQI
30th Jul 2026382 AMAQI
30th Jul 2026403 AMAQI

18°C12/26°C

30th Jul 2026504 AMAQI
30th Jul 2026445 AMAQI
30th Jul 2026426 AMAQI
30th Jul 2026367 AMAQI
30th Jul 2026328 AMAQI
30th Jul 2026319 AMAQI
30th Jul 20263110 AMAQI
30th Jul 20262911 AMAQI
30th Jul 20263112 PMAQI
30th Jul 2026311 PMAQI
30th Jul 2026382 PMAQI
30th Jul 2026383 PMAQI
30th Jul 2026364 PMAQI
30th Jul 2026335 PMAQI
30th Jul 2026336 PMAQI
30th Jul 2026407 PMAQI
30th Jul 2026428 PMAQI
30th Jul 2026569 PMAQI
30th Jul 20263810 PMAQI
30th Jul 20264011 PMAQI
31st Jul 20264212 AMAQI
31st Jul 2026541 AMAQI
31st Jul 2026312 AMAQI
31st Jul 2026443 AMAQI

20°C14/26°C

31st Jul 2026424 AMAQI
31st Jul 2026445 AMAQI
31st Jul 2026466 AMAQI
31st Jul 2026477 AMAQI
31st Jul 2026548 AMAQI
31st Jul 2026499 AMAQI
31st Jul 20264210 AMAQI
31st Jul 20265411 AMAQI
31st Jul 20265012 PMAQI
31st Jul 2026251 PMAQI
31st Jul 2026292 PMAQI
31st Jul 2026383 PMAQI
31st Jul 2026424 PMAQI
31st Jul 2026405 PMAQI
31st Jul 2026406 PMAQI
31st Jul 2026427 PMAQI
31st Jul 2026448 PMAQI
31st Jul 2026449 PMAQI
31st Jul 20264210 PMAQI
31st Jul 20264411 PMAQI
1st Aug 20264812 AMAQI
1st Aug 2026441 AMAQI
1st Aug 2026422 AMAQI
1st Aug 2026423 AMAQI

20°C14/28°C

1st Aug 2026404 AMAQI
1st Aug 2026405 AMAQI
1st Aug 2026386 AMAQI
1st Aug 2026387 AMAQI
1st Aug 2026338 AMAQI
1st Aug 2026339 AMAQI
1st Aug 20263610 AMAQI
1st Aug 20263311 AMAQI
1st Aug 20263412 PMAQI
1st Aug 2026311 PMAQI
1st Aug 2026332 PMAQI
1st Aug 2026313 PMAQI
1st Aug 2026294 PMAQI
1st Aug 2026295 PMAQI
1st Aug 2026316 PMAQI
1st Aug 2026297 PMAQI
1st Aug 2026298 PMAQI
1st Aug 2026299 PMAQI
1st Aug 20262910 PMAQI
1st Aug 20263111 PMAQI
2nd Aug 20262912 AMAQI
2nd Aug 2026311 AMAQI
2nd Aug 2026332 AMAQI
2nd Aug 2026293 AMAQI

21°C14/28°C

2nd Aug 2026314 AMAQI
4 AM
2nd Aug 2026295 AMAQI
2nd Aug 2026296 AMAQI
2nd Aug 2026297 AMAQI
2nd Aug 2026318 AMAQI
2nd Aug 2026279 AMAQI
2nd Aug 20263110 AMAQI
2nd Aug 20263111 AMAQI
11 AM
2nd Aug 20263812 PMAQI
2nd Aug 2026381 PMAQI
2nd Aug 2026402 PMAQI
2nd Aug 2026423 PMAQI
2nd Aug 2026404 PMAQI
2nd Aug 2026405 PMAQI
2nd Aug 2026406 PMAQI
2nd Aug 2026447 PMAQI
7 PM
2nd Aug 2026448 PMAQI
2nd Aug 2026429 PMAQI
2nd Aug 20264410 PMAQI
2nd Aug 20264611 PMAQI
11 PM
3 AM

21°C15/28°C

Day time
Avg. Highest Time
7 PM

40AQI

1 hours / Day
30 hours / Month
Avg. Lowest Time
9 AM - 10 AM

30AQI

2 hours / Day
60 hours / Month
In the last 30 days, during the daytime, the highest AQI was between 7 PM to 7 PM (Avg. 40), while the lowest AQI was between 9 AM to 10 AM (Avg. 30).
Night time
Avg. Highest Time
8 PM - 11 PM

36AQI

4 hours / Day
120 hours / Month
Avg. Lowest Time
2 AM

32AQI

1 hours / Day
30 hours / Month
In the last 30 days, during the daytime, the highest AQI was between 8 PM to 11 PM (Avg. 36), while the lowest AQI was between 2 AM to 2 AM (Avg. 32).

2026 Days Vs Air Quality

Omachi, Nagano, Japan

2026

89%

191

11%

23

Total number of days with different AQI categories in last 214 days in 2026 (151 days remaining)

Good
191 Days
Moderate
23 Days
Poor
0 Days
Unhealthy
0 Days
Severe
0 Days
Hazardous
0 Days

Under WHO’s Safe Air Quality Limits: 89%

Health Risk Level:

Low

In 2026, 89% of 214 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

Omachi, Nagano, 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
16AQI (US)
3rd January 2026
20AQI (US)
4th January 2026
25AQI (US)
5th January 2026
32AQI (US)
6th January 2026
22AQI (US)
7th January 2026
23AQI (US)
8th January 2026
30AQI (US)
9th January 2026
24AQI (US)
10th January 2026
26AQI (US)
11th January 2026
21AQI (US)
12th January 2026
21AQI (US)
13th January 2026
31AQI (US)
14th January 2026
16AQI (US)
15th January 2026
37AQI (US)
16th January 2026
48AQI (US)
17th January 2026
45AQI (US)
18th January 2026
24AQI (US)
19th January 2026
46AQI (US)
20th January 2026
28AQI (US)
21st January 2026
15AQI (US)
22nd January 2026
21AQI (US)
23rd January 2026
35AQI (US)
24th January 2026
37AQI (US)
25th January 2026
41AQI (US)
26th January 2026
21AQI (US)
27th January 2026
34AQI (US)
28th January 2026
27AQI (US)
29th January 2026
26AQI (US)
30th January 2026
36AQI (US)
31st January 2026
42AQI (US)
1st February 2026
32AQI (US)
2nd February 2026
36AQI (US)
3rd February 2026
29AQI (US)
4th February 2026
37AQI (US)
5th February 2026
41AQI (US)
6th February 2026
36AQI (US)
7th February 2026
22AQI (US)
8th February 2026
12AQI (US)
9th February 2026
33AQI (US)
10th February 2026
38AQI (US)
11th February 2026
46AQI (US)
12th February 2026
38AQI (US)
13th February 2026
41AQI (US)
14th February 2026
58AQI (US)
15th February 2026
57AQI (US)
16th February 2026
42AQI (US)
17th February 2026
19AQI (US)
18th February 2026
29AQI (US)
19th February 2026
13AQI (US)
20th February 2026
25AQI (US)
21st February 2026
45AQI (US)
22nd February 2026
35AQI (US)
23rd February 2026
41AQI (US)
24th February 2026
40AQI (US)
25th February 2026
33AQI (US)
26th February 2026
24AQI (US)
27th February 2026
29AQI (US)
28th February 2026
14AQI (US)
1st March 2026
30AQI (US)
2nd March 2026
62AQI (US)
3rd March 2026
36AQI (US)
4th March 2026
41AQI (US)
5th March 2026
51AQI (US)
6th March 2026
42AQI (US)
7th March 2026
36AQI (US)
8th March 2026
43AQI (US)
9th March 2026
42AQI (US)
10th March 2026
48AQI (US)
11th March 2026
48AQI (US)
12th March 2026
54AQI (US)
13th March 2026
34AQI (US)
14th March 2026
40AQI (US)
15th March 2026
44AQI (US)
16th March 2026
50AQI (US)
17th March 2026
47AQI (US)
18th March 2026
50AQI (US)
19th March 2026
30AQI (US)
20th March 2026
29AQI (US)
21st March 2026
48AQI (US)
22nd March 2026
45AQI (US)
23rd March 2026
51AQI (US)
24th March 2026
72AQI (US)
25th March 2026
60AQI (US)
26th March 2026
18AQI (US)
27th March 2026
19AQI (US)
28th March 2026
52AQI (US)
29th March 2026
69AQI (US)
30th March 2026
66AQI (US)
31st March 2026
24AQI (US)
1st April 2026
13AQI (US)
2nd April 2026
15AQI (US)
3rd April 2026
35AQI (US)
4th April 2026
38AQI (US)
5th April 2026
25AQI (US)
6th April 2026
24AQI (US)
7th April 2026
30AQI (US)
8th April 2026
29AQI (US)
9th April 2026
27AQI (US)
10th April 2026
27AQI (US)
11th April 2026
30AQI (US)
12th April 2026
29AQI (US)
13th April 2026
29AQI (US)
14th April 2026
39AQI (US)
15th April 2026
52AQI (US)
16th April 2026
28AQI (US)
17th April 2026
28AQI (US)
18th April 2026
38AQI (US)
19th April 2026
35AQI (US)
20th April 2026
32AQI (US)
21st April 2026
40AQI (US)
22nd April 2026
29AQI (US)
23rd April 2026
21AQI (US)
24th April 2026
24AQI (US)
25th April 2026
34AQI (US)
26th April 2026
41AQI (US)
27th April 2026
37AQI (US)
28th April 2026
34AQI (US)
29th April 2026
29AQI (US)
30th April 2026
30AQI (US)
1st May 2026
33AQI (US)
2nd May 2026
44AQI (US)
3rd May 2026
45AQI (US)
4th May 2026
17AQI (US)
5th May 2026
28AQI (US)
6th May 2026
30AQI (US)
7th May 2026
33AQI (US)
8th May 2026
27AQI (US)
9th May 2026
26AQI (US)
10th May 2026
34AQI (US)
11th May 2026
33AQI (US)
12th May 2026
40AQI (US)
13th May 2026
42AQI (US)
14th May 2026
32AQI (US)
15th May 2026
32AQI (US)
16th May 2026
83AQI (US)
17th May 2026
67AQI (US)
18th May 2026
54AQI (US)
19th May 2026
49AQI (US)
20th May 2026
60AQI (US)
21st May 2026
60AQI (US)
22nd May 2026
63AQI (US)
23rd May 2026
55AQI (US)
24th May 2026
60AQI (US)
25th May 2026
50AQI (US)
26th May 2026
40AQI (US)
27th May 2026
29AQI (US)
28th May 2026
27AQI (US)
29th May 2026
18AQI (US)
30th May 2026
22AQI (US)
31st May 2026
25AQI (US)
1st June 2026
27AQI (US)
2nd June 2026
31AQI (US)
3rd June 2026
12AQI (US)
4th June 2026
16AQI (US)
5th June 2026
21AQI (US)
6th June 2026
20AQI (US)
7th June 2026
20AQI (US)
8th June 2026
17AQI (US)
9th June 2026
20AQI (US)
10th June 2026
21AQI (US)
11th June 2026
24AQI (US)
12th June 2026
24AQI (US)
13th June 2026
24AQI (US)
14th June 2026
23AQI (US)
15th June 2026
20AQI (US)
16th June 2026
25AQI (US)
17th June 2026
24AQI (US)
18th June 2026
26AQI (US)
19th June 2026
27AQI (US)
20th June 2026
22AQI (US)
21st June 2026
15AQI (US)
22nd June 2026
15AQI (US)
23rd June 2026
20AQI (US)
24th June 2026
21AQI (US)
25th June 2026
24AQI (US)
26th June 2026
25AQI (US)
27th June 2026
24AQI (US)
28th June 2026
24AQI (US)
29th June 2026
24AQI (US)
30th June 2026
24AQI (US)
1st July 2026
25AQI (US)
2nd July 2026
20AQI (US)
3rd July 2026
17AQI (US)
4th July 2026
26AQI (US)
5th July 2026
20AQI (US)
6th July 2026
17AQI (US)
7th July 2026
21AQI (US)
8th July 2026
26AQI (US)
9th July 2026
26AQI (US)
10th July 2026
29AQI (US)
11th July 2026
44AQI (US)
12th July 2026
29AQI (US)
13th July 2026
27AQI (US)
14th July 2026
28AQI (US)
15th July 2026
26AQI (US)
16th July 2026
36AQI (US)
17th July 2026
35AQI (US)
18th July 2026
40AQI (US)
19th July 2026
32AQI (US)
20th July 2026
54AQI (US)
21st July 2026
65AQI (US)
22nd July 2026
69AQI (US)
23rd July 2026
37AQI (US)
24th July 2026
30AQI (US)
25th July 2026
31AQI (US)
26th July 2026
28AQI (US)
27th July 2026
30AQI (US)
28th July 2026
27AQI (US)
29th July 2026
25AQI (US)
30th July 2026
37AQI (US)
31st July 2026
43AQI (US)
1st August 2026
35AQI (US)
2nd August 2026
36AQI (US)
3rd August 2026
4th August 2026
5th August 2026
6th August 2026
7th August 2026
8th August 2026
9th August 2026
10th August 2026
11th August 2026
12th August 2026
13th August 2026
14th August 2026
15th August 2026
16th August 2026
17th August 2026
18th August 2026
19th August 2026
20th August 2026
21st August 2026
22nd August 2026
23rd August 2026
24th August 2026
25th August 2026
26th August 2026
27th August 2026
28th August 2026
29th August 2026
30th August 2026
31st August 2026
1st September 2026
2nd September 2026
3rd September 2026
4th September 2026
5th September 2026
6th September 2026
7th September 2026
8th September 2026
9th September 2026
10th September 2026
11th September 2026
12th September 2026
13th September 2026
14th September 2026
15th September 2026
16th September 2026
17th September 2026
18th September 2026
19th September 2026
20th September 2026
21st September 2026
22nd September 2026
23rd September 2026
24th September 2026
25th September 2026
26th September 2026
27th September 2026
28th September 2026
29th September 2026
30th September 2026
1st October 2026
2nd October 2026
3rd October 2026
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

29AQI (US)

34AQI (US)

45AQI (US)

31AQI (US)

41AQI (US)

22AQI (US)

32AQI (US)

36AQI (US)

No. of days

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

202633AQI (US)

31
26
2
22
9
29
1
23
8
30
28
3
2
191
23

Highest AQI (US) recorded in

March

45AQI (US)

Lowest AQI (US) recorded in

June

22AQI (US)

202541AQI (US)

31
28
26
5
27
3
25
6
23
7
21
10
22
9
30
17
14
23
7
24
7
297
68

Highest AQI (US) recorded in

July

48AQI (US)

Lowest AQI (US) recorded in

January

32AQI (US)

202435AQI (US)

30
27
22
4
10
2
20
28
2
31
31
23
6
31
29
1
31
313
15

Highest AQI (US) recorded in

March

44AQI (US)

Lowest AQI (US) recorded in

December

27AQI (US)

202341AQI (US)

29
2
25
3
25
6
23
7
22
9
21
7
16
15
31
30
30
26
3
31
309
52

Highest AQI (US) recorded in

July

49AQI (US)

Lowest AQI (US) recorded in

September

31AQI (US)

202239AQI (US)

14
11
20
11
22
8
24
1
28
31
30
27
197
30

Highest AQI (US) recorded in

May

50AQI (US)

Lowest AQI (US) recorded in

August

17AQI (US)

202133AQI (US)

30
1
27
1
26
3
18
1
19
12
13
17
27
4
31
28
31
29
21
300
39

Highest AQI (US) recorded in

June

54AQI (US)

Lowest AQI (US) recorded in

January

16AQI (US)

202021AQI (US)

12
1
20
1
18
21
4
31
11
10
1
19
29
30
31
222
16
1

Highest AQI (US) recorded in

August

49AQI (US)

Lowest AQI (US) recorded in

May

7AQI (US)

Most & Least Polluted Years Over the Last 7 Years

Most Polluted Year Recorded
2025(Avg.)
41AQI (US)
Least Polluted Year Recorded
2020(Avg.)
21AQI (US)

Omachi's annual 2026 AQI (US) (33) shows an average percentage change of -0.4% (improved AQI (US)) compared to previous years: 2020 (21), 2021 (33), 2022 (39), 2023 (41), 2024 (35), 2025 (41).