Country Background
HistoryAQIPM2.5PM10COSO2NO2O3

Ontario, Oregon, United States 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

Ontario, Oregon, United States

2025
AQI
.
Days

AQI Trends: Highest and Lowest

Highest AQI recorded on
1st Aug 2025
38AQI
Lowest AQI recorded on
1st Aug 2025
38AQI

Same Day Analysis (1st August ):
On this day, AQI across the 1 years varied significantly: 2025 ranks 1st highest AQI at 38 of Good air quality on the same day.

Download 2024 Annual Data

World Air Quality Report

Globe

Day & Night AQI Trend: 1st Aug - 2nd Aug 2025

Ontario, Oregon, United States

AQI
Day
Night
.

6 AM1st Aug 2025

9 PM

5 AM2nd Aug 2025

Day time
Avg. Highest Time
2PM1st Aug

57AQI

Avg. Lowest Time
7AM1st Aug

43AQI

Night time
Avg. Highest Time
10PM1st Aug

46AQI

Avg. Lowest Time
2AM2nd Aug

41AQI

In the last 24 hours,

Ontario's AQI reached its highest point of 57 at 2 PM during the Day, while the lowest point, 41, was recorded at 2 AM during the Night between 1st Aug and 2nd Aug 2025.

Day & Night AQI Trend : Jul - Aug 2025

Ontario, Oregon, United States

JulAug
03rd - 04th04th - 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
3rd Jul 2025366 AMAQI
3rd Jul 2025387 AMAQI
3rd Jul 2025398 AMAQI
3rd Jul 2025379 AMAQI
3rd Jul 20253910 AMAQI
3rd Jul 20254111 AMAQI
3rd Jul 20254212 PMAQI
3rd Jul 2025441 PMAQI
3rd Jul 2025432 PMAQI
3rd Jul 2025443 PMAQI
3rd Jul 2025424 PMAQI
3rd Jul 2025415 PMAQI
3rd Jul 2025426 PMAQI
3rd Jul 2025407 PMAQI
3rd Jul 2025398 PMAQI
3rd Jul 2025389 PMAQI
3rd Jul 20253910 PMAQI
3rd Jul 20254111 PMAQI
4th Jul 20254112 AMAQI
4th Jul 2025401 AMAQI
4th Jul 2025392 AMAQI
4th Jul 2025373 AMAQI
4th Jul 2025374 AMAQI
4th Jul 2025405 AMAQI

25°C13/34°C

4th Jul 2025396 AMAQI
4th Jul 2025387 AMAQI
4th Jul 2025388 AMAQI
4th Jul 2025399 AMAQI
4th Jul 20253910 AMAQI
4th Jul 20254011 AMAQI
4th Jul 20254112 PMAQI
4th Jul 2025411 PMAQI
4th Jul 2025422 PMAQI
4th Jul 2025423 PMAQI
4th Jul 2025414 PMAQI
4th Jul 2025415 PMAQI
4th Jul 2025426 PMAQI
4th Jul 2025407 PMAQI
4th Jul 2025408 PMAQI
4th Jul 2025399 PMAQI
4th Jul 20253910 PMAQI
4th Jul 20254211 PMAQI
5th Jul 20255012 AMAQI
5th Jul 2025611 AMAQI
5th Jul 2025672 AMAQI
5th Jul 2025683 AMAQI
5th Jul 2025894 AMAQI
5th Jul 2025825 AMAQI

19°C13/25°C

5th Jul 2025706 AMAQI
5th Jul 2025727 AMAQI
5th Jul 2025868 AMAQI
5th Jul 2025869 AMAQI
5th Jul 20257810 AMAQI
5th Jul 20259011 AMAQI
5th Jul 202510112 PMAQI
5th Jul 2025941 PMAQI
5th Jul 2025752 PMAQI
5th Jul 2025773 PMAQI
5th Jul 2025754 PMAQI
5th Jul 2025695 PMAQI
5th Jul 2025636 PMAQI
5th Jul 2025617 PMAQI
5th Jul 2025608 PMAQI
5th Jul 2025559 PMAQI
5th Jul 20255310 PMAQI
5th Jul 20255411 PMAQI
6th Jul 20255512 AMAQI
6th Jul 2025591 AMAQI
6th Jul 2025612 AMAQI
6th Jul 2025593 AMAQI
6th Jul 2025544 AMAQI
6th Jul 2025545 AMAQI

20°C9/28°C

6th Jul 2025546 AMAQI
6th Jul 2025587 AMAQI
6th Jul 2025528 AMAQI
6th Jul 2025519 AMAQI
6th Jul 20255210 AMAQI
6th Jul 20255111 AMAQI
6th Jul 20255212 PMAQI
6th Jul 2025531 PMAQI
6th Jul 2025522 PMAQI
6th Jul 2025533 PMAQI
6th Jul 2025524 PMAQI
6th Jul 2025505 PMAQI
6th Jul 2025506 PMAQI
6th Jul 2025517 PMAQI
6th Jul 2025498 PMAQI
6th Jul 2025479 PMAQI
6th Jul 20254610 PMAQI
6th Jul 20254711 PMAQI
7th Jul 20254612 AMAQI
7th Jul 2025481 AMAQI
7th Jul 2025482 AMAQI
7th Jul 2025493 AMAQI
7th Jul 2025474 AMAQI
7th Jul 2025465 AMAQI

22°C10/32°C

7th Jul 2025446 AMAQI
7th Jul 2025437 AMAQI
7th Jul 2025448 AMAQI
7th Jul 2025439 AMAQI
7th Jul 20254310 AMAQI
7th Jul 20254611 AMAQI
7th Jul 20254712 PMAQI
7th Jul 2025481 PMAQI
7th Jul 2025482 PMAQI
7th Jul 2025483 PMAQI
7th Jul 2025484 PMAQI
7th Jul 2025485 PMAQI
7th Jul 2025486 PMAQI
7th Jul 2025477 PMAQI
7th Jul 2025468 PMAQI
7th Jul 2025469 PMAQI
7th Jul 20254710 PMAQI
7th Jul 20254711 PMAQI
8th Jul 20254612 AMAQI
8th Jul 2025471 AMAQI
8th Jul 2025522 AMAQI
8th Jul 2025473 AMAQI
8th Jul 2025464 AMAQI
8th Jul 2025455 AMAQI

25°C13/36°C

8th Jul 2025486 AMAQI
8th Jul 2025447 AMAQI
8th Jul 2025438 AMAQI
8th Jul 2025439 AMAQI
8th Jul 20254510 AMAQI
8th Jul 20254511 AMAQI
8th Jul 20254612 PMAQI
8th Jul 2025481 PMAQI
8th Jul 2025482 PMAQI
8th Jul 2025473 PMAQI
8th Jul 2025474 PMAQI
8th Jul 2025465 PMAQI
8th Jul 2025456 PMAQI
8th Jul 2025457 PMAQI
8th Jul 2025448 PMAQI
8th Jul 2025459 PMAQI
8th Jul 20254210 PMAQI
8th Jul 20254211 PMAQI
9th Jul 20254312 AMAQI
9th Jul 2025461 AMAQI
9th Jul 2025422 AMAQI
9th Jul 2025423 AMAQI
9th Jul 2025394 AMAQI
9th Jul 2025405 AMAQI

27°C13/39°C

9th Jul 2025396 AMAQI
9th Jul 2025427 AMAQI
9th Jul 2025418 AMAQI
9th Jul 2025419 AMAQI
9th Jul 20254310 AMAQI
9th Jul 20254311 AMAQI
9th Jul 20254512 PMAQI
9th Jul 2025491 PMAQI
9th Jul 2025482 PMAQI
9th Jul 2025453 PMAQI
9th Jul 2025434 PMAQI
9th Jul 2025435 PMAQI
9th Jul 2025426 PMAQI
9th Jul 2025427 PMAQI
9th Jul 2025398 PMAQI
9th Jul 2025389 PMAQI
9th Jul 20254110 PMAQI
9th Jul 20254011 PMAQI
10th Jul 20254012 AMAQI
10th Jul 2025421 AMAQI
10th Jul 2025392 AMAQI
10th Jul 2025373 AMAQI
10th Jul 2025384 AMAQI
10th Jul 2025425 AMAQI

27°C17/37°C

10th Jul 2025416 AMAQI
10th Jul 2025397 AMAQI
10th Jul 2025388 AMAQI
10th Jul 2025379 AMAQI
10th Jul 20254110 AMAQI
10th Jul 20254311 AMAQI
10th Jul 20254512 PMAQI
10th Jul 2025461 PMAQI
10th Jul 2025482 PMAQI
10th Jul 2025433 PMAQI
10th Jul 2025414 PMAQI
10th Jul 2025425 PMAQI
10th Jul 2025436 PMAQI
10th Jul 2025427 PMAQI
10th Jul 2025388 PMAQI
10th Jul 2025409 PMAQI
10th Jul 20254110 PMAQI
10th Jul 20254011 PMAQI
11th Jul 20254212 AMAQI
11th Jul 2025451 AMAQI
11th Jul 2025442 AMAQI
11th Jul 2025443 AMAQI
11th Jul 2025444 AMAQI
11th Jul 2025425 AMAQI

24°C15/32°C

11th Jul 2025426 AMAQI
11th Jul 2025437 AMAQI
11th Jul 2025438 AMAQI
11th Jul 2025439 AMAQI
11th Jul 20254310 AMAQI
11th Jul 20254411 AMAQI
11th Jul 20254512 PMAQI
11th Jul 2025461 PMAQI
11th Jul 2025462 PMAQI
11th Jul 2025473 PMAQI
11th Jul 2025464 PMAQI
11th Jul 2025465 PMAQI
11th Jul 2025466 PMAQI
11th Jul 2025457 PMAQI
11th Jul 2025458 PMAQI
11th Jul 2025459 PMAQI
11th Jul 20254510 PMAQI
11th Jul 20254711 PMAQI
12th Jul 20254612 AMAQI
12th Jul 2025471 AMAQI
12th Jul 2025472 AMAQI
12th Jul 2025463 AMAQI
12th Jul 2025464 AMAQI
12th Jul 2025465 AMAQI

25°C15/34°C

12th Jul 2025456 AMAQI
12th Jul 2025457 AMAQI
12th Jul 2025468 AMAQI
12th Jul 2025459 AMAQI
12th Jul 20254610 AMAQI
12th Jul 20254611 AMAQI
12th Jul 20254712 PMAQI
12th Jul 2025481 PMAQI
12th Jul 2025482 PMAQI
12th Jul 2025493 PMAQI
12th Jul 2025484 PMAQI
12th Jul 2025485 PMAQI
12th Jul 2025476 PMAQI
12th Jul 2025467 PMAQI
12th Jul 2025468 PMAQI
12th Jul 2025469 PMAQI
12th Jul 20254410 PMAQI
12th Jul 20254511 PMAQI
13th Jul 20254412 AMAQI
13th Jul 2025451 AMAQI
13th Jul 2025442 AMAQI
13th Jul 2025443 AMAQI
13th Jul 2025424 AMAQI
13th Jul 2025445 AMAQI

26°C14/36°C

13th Jul 2025436 AMAQI
13th Jul 2025437 AMAQI
13th Jul 2025478 AMAQI
13th Jul 2025469 AMAQI
13th Jul 20254610 AMAQI
13th Jul 20254611 AMAQI
13th Jul 20254612 PMAQI
13th Jul 2025471 PMAQI
13th Jul 2025462 PMAQI
13th Jul 2025473 PMAQI
13th Jul 2025464 PMAQI
13th Jul 2025455 PMAQI
13th Jul 2025446 PMAQI
13th Jul 2025457 PMAQI
13th Jul 2025448 PMAQI
13th Jul 2025439 PMAQI
13th Jul 20254210 PMAQI
13th Jul 20254011 PMAQI
14th Jul 20254212 AMAQI
14th Jul 2025421 AMAQI
14th Jul 2025402 AMAQI
14th Jul 2025363 AMAQI
14th Jul 2025354 AMAQI
14th Jul 2025365 AMAQI

27°C15/38°C

14th Jul 2025366 AMAQI
14th Jul 2025397 AMAQI
14th Jul 2025408 AMAQI
14th Jul 2025419 AMAQI
14th Jul 20254210 AMAQI
14th Jul 20254611 AMAQI
14th Jul 20254612 PMAQI
14th Jul 2025471 PMAQI
14th Jul 2025472 PMAQI
14th Jul 2025463 PMAQI
14th Jul 2025444 PMAQI
14th Jul 2025425 PMAQI
14th Jul 2025426 PMAQI
14th Jul 2025417 PMAQI
14th Jul 2025418 PMAQI
14th Jul 2025409 PMAQI
14th Jul 20253810 PMAQI
14th Jul 20253711 PMAQI
15th Jul 20253712 AMAQI
15th Jul 2025371 AMAQI
15th Jul 2025382 AMAQI
15th Jul 2025323 AMAQI
15th Jul 2025264 AMAQI
15th Jul 2025265 AMAQI

28°C17/39°C

15th Jul 2025256 AMAQI
15th Jul 2025277 AMAQI
15th Jul 2025308 AMAQI
15th Jul 2025329 AMAQI
15th Jul 20253610 AMAQI
15th Jul 20254011 AMAQI
15th Jul 20254312 PMAQI
15th Jul 2025401 PMAQI
15th Jul 2025402 PMAQI
15th Jul 2025403 PMAQI
15th Jul 2025374 PMAQI
15th Jul 2025375 PMAQI
15th Jul 2025376 PMAQI
15th Jul 2025357 PMAQI
15th Jul 2025368 PMAQI
15th Jul 2025359 PMAQI
15th Jul 20253410 PMAQI
15th Jul 20253311 PMAQI
16th Jul 20253212 AMAQI
16th Jul 2025321 AMAQI
16th Jul 2025312 AMAQI
16th Jul 2025303 AMAQI
16th Jul 2025274 AMAQI
16th Jul 2025285 AMAQI

25°C17/34°C

16th Jul 2025286 AMAQI
16th Jul 2025377 AMAQI
16th Jul 2025348 AMAQI
16th Jul 2025379 AMAQI
16th Jul 20253810 AMAQI
16th Jul 20253811 AMAQI
16th Jul 20254412 PMAQI
16th Jul 2025411 PMAQI
16th Jul 2025382 PMAQI
16th Jul 2025373 PMAQI
16th Jul 2025334 PMAQI
16th Jul 2025325 PMAQI
16th Jul 2025326 PMAQI
16th Jul 2025327 PMAQI
16th Jul 2025318 PMAQI
16th Jul 2025309 PMAQI
16th Jul 20253110 PMAQI
16th Jul 20252911 PMAQI
17th Jul 20252812 AMAQI
17th Jul 2025281 AMAQI
17th Jul 2025282 AMAQI
17th Jul 2025283 AMAQI
17th Jul 2025244 AMAQI
17th Jul 2025275 AMAQI

24°C13/33°C

17th Jul 2025296 AMAQI
17th Jul 2025307 AMAQI
17th Jul 2025328 AMAQI
17th Jul 2025319 AMAQI
17th Jul 20253010 AMAQI
17th Jul 20253311 AMAQI
17th Jul 20253312 PMAQI
17th Jul 2025341 PMAQI
17th Jul 2025432 PMAQI
17th Jul 2025333 PMAQI
17th Jul 2025364 PMAQI
17th Jul 2025365 PMAQI
17th Jul 2025336 PMAQI
17th Jul 2025317 PMAQI
17th Jul 2025318 PMAQI
17th Jul 2025399 PMAQI
17th Jul 20253410 PMAQI
17th Jul 20253211 PMAQI
18th Jul 20253312 AMAQI
18th Jul 2025321 AMAQI
18th Jul 2025312 AMAQI
18th Jul 2025323 AMAQI
18th Jul 2025304 AMAQI
18th Jul 2025305 AMAQI

25°C11/36°C

18th Jul 2025316 AMAQI
18th Jul 2025317 AMAQI
18th Jul 2025308 AMAQI
18th Jul 2025319 AMAQI
18th Jul 20252910 AMAQI
18th Jul 20253211 AMAQI
18th Jul 20253812 PMAQI
18th Jul 2025331 PMAQI
18th Jul 2025362 PMAQI
18th Jul 2025353 PMAQI
18th Jul 2025364 PMAQI
18th Jul 2025355 PMAQI
18th Jul 2025366 PMAQI
18th Jul 2025347 PMAQI
18th Jul 2025348 PMAQI
18th Jul 2025389 PMAQI
18th Jul 20253810 PMAQI
18th Jul 20253911 PMAQI
19th Jul 20253712 AMAQI
19th Jul 2025361 AMAQI
19th Jul 2025342 AMAQI
19th Jul 2025333 AMAQI
19th Jul 2025344 AMAQI
19th Jul 2025375 AMAQI

26°C15/37°C

19th Jul 2025356 AMAQI
19th Jul 2025357 AMAQI
19th Jul 2025368 AMAQI
19th Jul 2025369 AMAQI
19th Jul 20253710 AMAQI
19th Jul 20254111 AMAQI
19th Jul 20254212 PMAQI
19th Jul 2025391 PMAQI
19th Jul 2025402 PMAQI
19th Jul 2025383 PMAQI
19th Jul 2025384 PMAQI
19th Jul 2025375 PMAQI
19th Jul 2025366 PMAQI
19th Jul 2025367 PMAQI
19th Jul 2025388 PMAQI
19th Jul 2025389 PMAQI
19th Jul 20253610 PMAQI
19th Jul 20253311 PMAQI
20th Jul 20253512 AMAQI
20th Jul 2025351 AMAQI
20th Jul 2025352 AMAQI
20th Jul 2025333 AMAQI
20th Jul 2025334 AMAQI
20th Jul 2025355 AMAQI

24°C15/33°C

20th Jul 2025406 AMAQI
20th Jul 2025457 AMAQI
20th Jul 2025428 AMAQI
20th Jul 2025459 AMAQI
20th Jul 20254510 AMAQI
20th Jul 20254411 AMAQI
20th Jul 20254212 PMAQI
20th Jul 2025431 PMAQI
20th Jul 2025442 PMAQI
20th Jul 2025423 PMAQI
20th Jul 2025404 PMAQI
20th Jul 2025405 PMAQI
20th Jul 2025396 PMAQI
20th Jul 2025407 PMAQI
20th Jul 2025408 PMAQI
20th Jul 2025389 PMAQI
20th Jul 20253910 PMAQI
20th Jul 20253811 PMAQI
21st Jul 20253612 AMAQI
21st Jul 2025351 AMAQI
21st Jul 2025362 AMAQI
21st Jul 2025333 AMAQI
21st Jul 2025304 AMAQI
21st Jul 2025335 AMAQI

23°C14/31°C

21st Jul 2025346 AMAQI
21st Jul 2025377 AMAQI
21st Jul 2025378 AMAQI
21st Jul 2025379 AMAQI
21st Jul 20253810 AMAQI
21st Jul 20253611 AMAQI
21st Jul 20253612 PMAQI
21st Jul 2025361 PMAQI
21st Jul 2025362 PMAQI
21st Jul 2025383 PMAQI
21st Jul 2025374 PMAQI
21st Jul 2025385 PMAQI
21st Jul 2025366 PMAQI
21st Jul 2025377 PMAQI
21st Jul 2025358 PMAQI
21st Jul 2025349 PMAQI
21st Jul 20253510 PMAQI
21st Jul 20253411 PMAQI
22nd Jul 20253312 AMAQI
22nd Jul 2025321 AMAQI
22nd Jul 2025322 AMAQI
22nd Jul 2025293 AMAQI
22nd Jul 2025224 AMAQI
22nd Jul 2025255 AMAQI

19°C15/24°C

22nd Jul 2025276 AMAQI
22nd Jul 2025307 AMAQI
22nd Jul 2025328 AMAQI
22nd Jul 2025309 AMAQI
22nd Jul 20253210 AMAQI
22nd Jul 20253411 AMAQI
22nd Jul 20253512 PMAQI
22nd Jul 2025361 PMAQI
22nd Jul 2025342 PMAQI
22nd Jul 2025323 PMAQI
22nd Jul 2025334 PMAQI
22nd Jul 2025355 PMAQI
22nd Jul 2025346 PMAQI
22nd Jul 2025327 PMAQI
22nd Jul 2025328 PMAQI
22nd Jul 2025319 PMAQI
22nd Jul 20253110 PMAQI
22nd Jul 20253211 PMAQI
23rd Jul 20253012 AMAQI
23rd Jul 2025301 AMAQI
23rd Jul 2025282 AMAQI
23rd Jul 2025263 AMAQI
23rd Jul 2025214 AMAQI
23rd Jul 2025235 AMAQI

21°C10/30°C

23rd Jul 2025246 AMAQI
23rd Jul 2025267 AMAQI
23rd Jul 2025278 AMAQI
23rd Jul 2025319 AMAQI
23rd Jul 20253210 AMAQI
23rd Jul 20253211 AMAQI
23rd Jul 20253312 PMAQI
23rd Jul 2025341 PMAQI
23rd Jul 2025342 PMAQI
23rd Jul 2025313 PMAQI
23rd Jul 2025314 PMAQI
23rd Jul 2025325 PMAQI
23rd Jul 2025326 PMAQI
23rd Jul 2025297 PMAQI
23rd Jul 2025298 PMAQI
23rd Jul 2025299 PMAQI
23rd Jul 20252910 PMAQI
23rd Jul 20252911 PMAQI
24th Jul 20252812 AMAQI
24th Jul 2025261 AMAQI
24th Jul 2025292 AMAQI
24th Jul 2025313 AMAQI
24th Jul 2025324 AMAQI
24th Jul 2025325 AMAQI

23°C11/33°C

24th Jul 2025296 AMAQI
24th Jul 2025327 AMAQI
24th Jul 2025308 AMAQI
24th Jul 2025319 AMAQI
24th Jul 20253210 AMAQI
24th Jul 20253711 AMAQI
24th Jul 20254412 PMAQI
24th Jul 2025411 PMAQI
24th Jul 2025372 PMAQI
24th Jul 2025343 PMAQI
24th Jul 2025324 PMAQI
24th Jul 2025305 PMAQI
24th Jul 2025296 PMAQI
24th Jul 2025317 PMAQI
24th Jul 2025318 PMAQI
24th Jul 2025279 PMAQI
24th Jul 20252610 PMAQI
24th Jul 20252611 PMAQI
25th Jul 20252912 AMAQI
25th Jul 2025291 AMAQI
25th Jul 2025282 AMAQI
25th Jul 2025263 AMAQI
25th Jul 2025234 AMAQI
25th Jul 2025235 AMAQI

25°C12/36°C

25th Jul 2025256 AMAQI
25th Jul 2025247 AMAQI
25th Jul 2025248 AMAQI
25th Jul 2025259 AMAQI
25th Jul 20253010 AMAQI
25th Jul 20252911 AMAQI
25th Jul 20252512 PMAQI
25th Jul 2025281 PMAQI
25th Jul 2025272 PMAQI
25th Jul 2025273 PMAQI
25th Jul 2025254 PMAQI
25th Jul 2025265 PMAQI
25th Jul 2025266 PMAQI
25th Jul 2025257 PMAQI
25th Jul 2025268 PMAQI
25th Jul 2025269 PMAQI
25th Jul 20252610 PMAQI
25th Jul 20252511 PMAQI
26th Jul 20252412 AMAQI
26th Jul 2025231 AMAQI
26th Jul 2025232 AMAQI
26th Jul 2025223 AMAQI
26th Jul 2025214 AMAQI
26th Jul 2025205 AMAQI

26°C15/35°C

26th Jul 2025226 AMAQI
26th Jul 2025237 AMAQI
26th Jul 2025248 AMAQI
26th Jul 2025259 AMAQI
26th Jul 20253010 AMAQI
26th Jul 20252611 AMAQI
26th Jul 20252812 PMAQI
26th Jul 2025281 PMAQI
26th Jul 2025282 PMAQI
26th Jul 2025273 PMAQI
26th Jul 2025274 PMAQI
26th Jul 2025285 PMAQI
26th Jul 2025276 PMAQI
26th Jul 2025267 PMAQI
26th Jul 2025258 PMAQI
26th Jul 2025259 PMAQI
26th Jul 20252710 PMAQI
26th Jul 20252711 PMAQI
27th Jul 20252812 AMAQI
27th Jul 2025261 AMAQI
27th Jul 2025252 AMAQI
27th Jul 2025263 AMAQI
27th Jul 2025244 AMAQI
27th Jul 2025245 AMAQI

25°C14/35°C

27th Jul 2025266 AMAQI
27th Jul 2025277 AMAQI
27th Jul 2025308 AMAQI
27th Jul 2025299 AMAQI
27th Jul 20252710 AMAQI
27th Jul 20253111 AMAQI
27th Jul 20253312 PMAQI
27th Jul 2025321 PMAQI
27th Jul 2025312 PMAQI
27th Jul 2025303 PMAQI
27th Jul 2025294 PMAQI
27th Jul 2025285 PMAQI
27th Jul 2025286 PMAQI
27th Jul 2025307 PMAQI
27th Jul 2025298 PMAQI
27th Jul 2025299 PMAQI
27th Jul 20253010 PMAQI
27th Jul 20252811 PMAQI
28th Jul 20252912 AMAQI
28th Jul 2025281 AMAQI
28th Jul 2025272 AMAQI
28th Jul 2025293 AMAQI
28th Jul 2025304 AMAQI
28th Jul 2025275 AMAQI

24°C13/34°C

28th Jul 2025266 AMAQI
28th Jul 2025247 AMAQI
28th Jul 2025248 AMAQI
28th Jul 2025269 AMAQI
28th Jul 20252810 AMAQI
28th Jul 20253011 AMAQI
28th Jul 20253612 PMAQI
28th Jul 2025361 PMAQI
28th Jul 2025372 PMAQI
28th Jul 2025323 PMAQI
28th Jul 2025344 PMAQI
28th Jul 2025315 PMAQI
28th Jul 2025316 PMAQI
28th Jul 2025307 PMAQI
28th Jul 2025318 PMAQI
28th Jul 2025319 PMAQI
28th Jul 20253010 PMAQI
28th Jul 20253011 PMAQI
29th Jul 20252912 AMAQI
29th Jul 2025301 AMAQI
29th Jul 2025302 AMAQI
29th Jul 2025283 AMAQI
29th Jul 2025274 AMAQI
29th Jul 2025285 AMAQI

26°C15/36°C

29th Jul 2025286 AMAQI
29th Jul 2025357 AMAQI
29th Jul 2025298 AMAQI
29th Jul 2025339 AMAQI
29th Jul 20253610 AMAQI
29th Jul 20253811 AMAQI
29th Jul 20254212 PMAQI
29th Jul 2025411 PMAQI
29th Jul 2025442 PMAQI
29th Jul 2025373 PMAQI
29th Jul 2025364 PMAQI
29th Jul 2025345 PMAQI
29th Jul 2025346 PMAQI
29th Jul 2025327 PMAQI
29th Jul 2025358 PMAQI
29th Jul 2025359 PMAQI
29th Jul 20253610 PMAQI
29th Jul 20253411 PMAQI
30th Jul 20253812 AMAQI
30th Jul 2025361 AMAQI
30th Jul 2025342 AMAQI
30th Jul 2025343 AMAQI
30th Jul 2025354 AMAQI
30th Jul 2025365 AMAQI

27°C16/38°C

30th Jul 2025406 AMAQI
30th Jul 2025397 AMAQI
30th Jul 2025428 AMAQI
30th Jul 2025439 AMAQI
30th Jul 20254710 AMAQI
30th Jul 20255111 AMAQI
30th Jul 20255012 PMAQI
30th Jul 2025471 PMAQI
30th Jul 2025472 PMAQI
30th Jul 2025483 PMAQI
30th Jul 2025484 PMAQI
30th Jul 2025485 PMAQI
30th Jul 2025486 PMAQI
30th Jul 2025487 PMAQI
30th Jul 2025488 PMAQI
30th Jul 2025419 PMAQI
30th Jul 20254010 PMAQI
30th Jul 20254011 PMAQI
31st Jul 20254112 AMAQI
31st Jul 2025421 AMAQI
31st Jul 2025452 AMAQI
31st Jul 2025443 AMAQI
31st Jul 2025464 AMAQI
31st Jul 2025465 AMAQI

25°C14/37°C

31st Jul 2025476 AMAQI
31st Jul 2025497 AMAQI
31st Jul 2025518 AMAQI
31st Jul 2025529 AMAQI
31st Jul 20255510 AMAQI
31st Jul 20255611 AMAQI
31st Jul 20255612 PMAQI
31st Jul 2025541 PMAQI
31st Jul 2025552 PMAQI
31st Jul 2025543 PMAQI
31st Jul 2025504 PMAQI
31st Jul 2025475 PMAQI
31st Jul 2025466 PMAQI
31st Jul 2025477 PMAQI
31st Jul 2025448 PMAQI
31st Jul 2025429 PMAQI
31st Jul 20254410 PMAQI
31st Jul 20254611 PMAQI
1st Aug 20254712 AMAQI
1st Aug 2025471 AMAQI
1st Aug 2025462 AMAQI
1st Aug 2025433 AMAQI
1st Aug 2025444 AMAQI
1st Aug 2025455 AMAQI

27°C17/36°C

1st Aug 2025446 AMAQI
1st Aug 2025437 AMAQI
1st Aug 2025468 AMAQI
1st Aug 2025489 AMAQI
1st Aug 20255010 AMAQI
1st Aug 20255211 AMAQI
1st Aug 20255312 PMAQI
1st Aug 2025551 PMAQI
1st Aug 2025572 PMAQI
1st Aug 2025543 PMAQI
1st Aug 2025534 PMAQI
1st Aug 2025525 PMAQI
1st Aug 2025516 PMAQI
1st Aug 2025467 PMAQI
1st Aug 2025468 PMAQI
1st Aug 2025479 PMAQI
1st Aug 20254610 PMAQI
1st Aug 20254211 PMAQI
2nd Aug 20254412 AMAQI
2nd Aug 2025421 AMAQI
2nd Aug 2025412 AMAQI
2nd Aug 2025433 AMAQI
2nd Aug 2025444 AMAQI
2nd Aug 2025435 AMAQI

24°C16/33°C

2nd Aug 2025426 AMAQI
6 AM
2nd Aug 2025417 AMAQI
2nd Aug 2025438 AMAQI
2nd Aug 2025469 AMAQI
2nd Aug 20254910 AMAQI
2nd Aug 20255111 AMAQI
2nd Aug 20255112 PMAQI
2nd Aug 2025521 PMAQI
1 PM
2nd Aug 2025552 PMAQI
2nd Aug 2025533 PMAQI
2nd Aug 2025524 PMAQI
9 PM
1 AM
5 AM

--°C/°C

Day time
Avg. Highest Time
6 AM - 9 PM

40AQI

16 hours / Day
480 hours / Month
Avg. Lowest Time
6 AM - 9 AM

38AQI

4 hours / Day
120 hours / Month
In the last 30 days, during the daytime, the highest AQI was between 6 AM to 9 PM (Avg. 40), while the lowest AQI was between 6 AM to 9 AM (Avg. 38).
Night time
Avg. Highest Time
12 AM - 11 PM

38AQI

8 hours / Day
240 hours / Month
Avg. Lowest Time
12 AM - 11 PM

38AQI

8 hours / Day
240 hours / Month
In the last 30 days, during the daytime, the highest AQI was between 12 AM to 11 PM (Avg. 38), while the lowest AQI was between 12 AM to 11 PM (Avg. 38).

2025 Days Vs Air Quality

Ontario, Oregon, United States

2025

100%

129

Total number of days with different AQI categories in last 214 days in 2025 (151 days remaining)

Good
129 Days
Moderate
0 Days
Poor
0 Days
Unhealthy
0 Days
Severe
0 Days
Hazardous
0 Days

Under WHO’s Safe Air Quality Limits: 100%

Health Risk Level:

Very Low

In 2025, 100% of 214 days were within WHO’s safe air quality limits. The risk of health issues is Very Low, but health impacts are still unclear.

Annual Air Quality Insights

Ontario, Oregon, United States

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.

1st March 2025
26AQI
2nd March 2025
25AQI
3rd March 2025
23AQI
4th March 2025
21AQI
5th March 2025
27AQI
6th March 2025
26AQI
1st April 2025
24AQI
2nd April 2025
24AQI
3rd April 2025
22AQI
4th April 2025
22AQI
5th April 2025
32AQI
6th April 2025
36AQI
7th April 2025
27AQI
8th April 2025
21AQI
9th April 2025
27AQI
10th April 2025
32AQI
11th April 2025
28AQI
12th April 2025
23AQI
13th April 2025
24AQI
14th April 2025
33AQI
15th April 2025
37AQI
16th April 2025
30AQI
17th April 2025
21AQI
18th April 2025
20AQI
19th April 2025
26AQI
20th April 2025
25AQI
21st April 2025
18AQI
22nd April 2025
20AQI
23rd April 2025
22AQI
24th April 2025
29AQI
25th April 2025
36AQI
26th April 2025
26AQI
27th April 2025
29AQI
28th April 2025
26AQI
29th April 2025
24AQI
30th April 2025
23AQI
1st May 2025
29AQI
2nd May 2025
29AQI
3rd May 2025
28AQI
4th May 2025
18AQI
5th May 2025
20AQI
6th May 2025
21AQI
7th May 2025
27AQI
8th May 2025
25AQI
9th May 2025
31AQI
10th May 2025
34AQI
11th May 2025
27AQI
12th May 2025
21AQI
13th May 2025
18AQI
14th May 2025
18AQI
15th May 2025
21AQI
16th May 2025
20AQI
17th May 2025
22AQI
18th May 2025
18AQI
19th May 2025
22AQI
20th May 2025
20AQI
21st May 2025
18AQI
22nd May 2025
21AQI
23rd May 2025
21AQI
24th May 2025
25AQI
25th May 2025
30AQI
26th May 2025
26AQI
27th May 2025
22AQI
28th May 2025
26AQI
29th May 2025
30AQI
30th May 2025
21AQI
31st May 2025
30AQI
1st June 2025
26AQI
2nd June 2025
18AQI
3rd June 2025
19AQI
4th June 2025
21AQI
5th June 2025
23AQI
6th June 2025
28AQI
7th June 2025
31AQI
8th June 2025
28AQI
9th June 2025
30AQI
10th June 2025
32AQI
11th June 2025
33AQI
12th June 2025
33AQI
13th June 2025
31AQI
14th June 2025
25AQI
15th June 2025
25AQI
16th June 2025
28AQI
17th June 2025
27AQI
18th June 2025
28AQI
19th June 2025
24AQI
20th June 2025
26AQI
21st June 2025
24AQI
22nd June 2025
22AQI
23rd June 2025
26AQI
24th June 2025
33AQI
25th June 2025
33AQI
26th June 2025
26AQI
27th June 2025
23AQI
28th June 2025
21AQI
29th June 2025
23AQI
30th June 2025
24AQI
1st July 2025
30AQI
2nd July 2025
29AQI
3rd July 2025
27AQI
4th July 2025
25AQI
5th July 2025
39AQI
6th July 2025
30AQI
7th July 2025
25AQI
8th July 2025
29AQI
9th July 2025
28AQI
10th July 2025
23AQI
11th July 2025
24AQI
12th July 2025
26AQI
13th July 2025
28AQI
14th July 2025
26AQI
15th July 2025
24AQI
16th July 2025
27AQI
17th July 2025
37AQI
18th July 2025
40AQI
19th July 2025
36AQI
20th July 2025
33AQI
21st July 2025
23AQI
22nd July 2025
27AQI
23rd July 2025
29AQI
24th July 2025
32AQI
25th July 2025
28AQI
26th July 2025
23AQI
27th July 2025
23AQI
28th July 2025
24AQI
29th July 2025
23AQI
30th July 2025
30AQI
31st July 2025
35AQI
1st August 2025
38AQI

25AQI

26AQI

24AQI

26AQI

28AQI

38AQI

No. of days

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

202526AQI

6
30
31
30
31
1
129

Highest AQI recorded in

August

38AQI

Lowest AQI recorded in

May

24AQI

Most & Least Polluted Years Over the Last 1 Years

Most Polluted Year Recorded
2025(Avg.)
26AQI
Least Polluted Year Recorded
2025(Avg.)
26AQI

Ontario's annual 2025 AQI (26) shows an average percentage change of NaN% (improved AQI) compared to previous years: .