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HistoryAQIPM₂.₅PM₁₀COSO₂NO₂O₃

Grass Valley, California, 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

Grass Valley, California, United States

2022
2023
2024
2025
2026
AQI
.
Days

AQI Trends: Highest and Lowest

Highest AQI recorded on
8th Aug 2024
80AQI
Lowest AQI recorded on
18th Aug 2025
20AQI

Same Day Analysis (12th August):
On this day, AQI across the 5 years varied significantly: 2026 ranks 2nd highest AQI at 48 of Good air quality, showing improvement over 2025 on the same day.

Day & Night AQI Trend: 12th Aug - 13th Aug 2026

Grass Valley, California, United States

AQI
Day
Night
.

6 AM12th Aug 2026

8 PM

5 AM13th Aug 2026

Day time
Avg. Highest Time
12PM12th Aug

52AQI

Avg. Lowest Time
6AM12th Aug

41AQI

Night time
Avg. Highest Time
3AM13th Aug

53AQI

Avg. Lowest Time
5AM13th Aug

48AQI

In the last 24 hours,

Grass Valley's AQI reached its highest point of 53 at 3 AM during the Night, while the lowest point, 41, was recorded at 6 AM during the Day between 12th Aug and 13th Aug 2026.

Day & Night AQI Trend : Jul - Aug 2026

Grass Valley, California, United States

JulAug
15th - 16th16th - 17th17th - 18th18th - 19th19th - 20th20th - 21st21st - 22nd22nd - 23rd23rd - 24th24th - 25th25th - 26th26th - 27th27th - 28th28th - 29th29th - 30th30th - 31st31st - 01st01st - 02nd02nd - 03rd03rd - 04th04th - 05th05th - 06th06th - 07th07th - 08th08th - 09th09th - 10th10th - 11th11th - 12th12th - 13th13th
Day
Night
15th Jul 2026146 AMAQI
15th Jul 2026127 AMAQI
15th Jul 2026138 AMAQI
15th Jul 2026149 AMAQI
15th Jul 20261610 AMAQI
15th Jul 20261711 AMAQI
15th Jul 20261612 PMAQI
15th Jul 2026161 PMAQI
15th Jul 2026142 PMAQI
15th Jul 2026143 PMAQI
15th Jul 2026174 PMAQI
15th Jul 2026165 PMAQI
15th Jul 2026156 PMAQI
15th Jul 2026167 PMAQI
15th Jul 2026188 PMAQI
15th Jul 2026199 PMAQI
15th Jul 20261610 PMAQI
15th Jul 20261811 PMAQI
16th Jul 20261712 AMAQI
16th Jul 2026171 AMAQI
16th Jul 2026182 AMAQI
16th Jul 2026183 AMAQI
16th Jul 2026164 AMAQI
16th Jul 2026145 AMAQI

28°C23/34°C

16th Jul 2026146 AMAQI
16th Jul 2026217 AMAQI
16th Jul 2026158 AMAQI
16th Jul 2026189 AMAQI
16th Jul 20261610 AMAQI
16th Jul 20261711 AMAQI
16th Jul 20262012 PMAQI
16th Jul 2026201 PMAQI
16th Jul 2026182 PMAQI
16th Jul 2026163 PMAQI
16th Jul 2026164 PMAQI
16th Jul 2026225 PMAQI
16th Jul 2026146 PMAQI
16th Jul 2026157 PMAQI
16th Jul 2026158 PMAQI
16th Jul 2026189 PMAQI
16th Jul 20262210 PMAQI
16th Jul 20262311 PMAQI
17th Jul 20261912 AMAQI
17th Jul 2026181 AMAQI
17th Jul 2026312 AMAQI
17th Jul 2026283 AMAQI
17th Jul 2026264 AMAQI
17th Jul 2026245 AMAQI

26°C20/33°C

17th Jul 2026206 AMAQI
17th Jul 2026247 AMAQI
17th Jul 2026308 AMAQI
17th Jul 2026249 AMAQI
17th Jul 20263110 AMAQI
17th Jul 20262911 AMAQI
17th Jul 20264212 PMAQI
17th Jul 2026421 PMAQI
17th Jul 2026402 PMAQI
17th Jul 2026363 PMAQI
17th Jul 2026324 PMAQI
17th Jul 2026325 PMAQI
17th Jul 2026426 PMAQI
17th Jul 2026287 PMAQI
17th Jul 2026508 PMAQI
17th Jul 2026509 PMAQI
17th Jul 20264410 PMAQI
17th Jul 20264511 PMAQI
18th Jul 20264112 AMAQI
18th Jul 2026451 AMAQI
18th Jul 2026482 AMAQI
18th Jul 2026393 AMAQI
18th Jul 2026474 AMAQI
18th Jul 2026305 AMAQI

26°C19/33°C

18th Jul 2026486 AMAQI
18th Jul 2026507 AMAQI
18th Jul 2026408 AMAQI
18th Jul 2026459 AMAQI
18th Jul 20264110 AMAQI
18th Jul 20264511 AMAQI
18th Jul 20264712 PMAQI
18th Jul 2026481 PMAQI
18th Jul 2026462 PMAQI
18th Jul 2026373 PMAQI
18th Jul 2026384 PMAQI
18th Jul 2026405 PMAQI
18th Jul 2026326 PMAQI
18th Jul 2026367 PMAQI
18th Jul 2026438 PMAQI
18th Jul 2026439 PMAQI
18th Jul 20264410 PMAQI
18th Jul 20265311 PMAQI
19th Jul 20265412 AMAQI
19th Jul 2026481 AMAQI
19th Jul 2026402 AMAQI
19th Jul 2026423 AMAQI
19th Jul 2026344 AMAQI
19th Jul 2026345 AMAQI

25°C20/32°C

19th Jul 2026456 AMAQI
19th Jul 2026447 AMAQI
19th Jul 2026368 AMAQI
19th Jul 2026409 AMAQI
19th Jul 20265010 AMAQI
19th Jul 20264211 AMAQI
19th Jul 20264512 PMAQI
19th Jul 2026481 PMAQI
19th Jul 2026442 PMAQI
19th Jul 2026453 PMAQI
19th Jul 2026464 PMAQI
19th Jul 2026415 PMAQI
19th Jul 2026396 PMAQI
19th Jul 2026327 PMAQI
19th Jul 2026438 PMAQI
19th Jul 2026459 PMAQI
19th Jul 20264710 PMAQI
19th Jul 20264611 PMAQI
20th Jul 20264112 AMAQI
20th Jul 2026461 AMAQI
20th Jul 2026522 AMAQI
20th Jul 2026423 AMAQI
20th Jul 2026444 AMAQI
20th Jul 2026395 AMAQI

26°C19/32°C

20th Jul 2026406 AMAQI
20th Jul 2026477 AMAQI
20th Jul 2026538 AMAQI
20th Jul 2026429 AMAQI
20th Jul 20264210 AMAQI
20th Jul 20264811 AMAQI
20th Jul 20264412 PMAQI
20th Jul 2026431 PMAQI
20th Jul 2026482 PMAQI
20th Jul 2026443 PMAQI
20th Jul 2026434 PMAQI
20th Jul 2026415 PMAQI
20th Jul 2026486 PMAQI
20th Jul 2026387 PMAQI
20th Jul 2026428 PMAQI
20th Jul 2026449 PMAQI
20th Jul 20264710 PMAQI
20th Jul 20264311 PMAQI
21st Jul 20263112 AMAQI
21st Jul 2026461 AMAQI
21st Jul 2026432 AMAQI
21st Jul 2026473 AMAQI
21st Jul 2026304 AMAQI
21st Jul 2026395 AMAQI

27°C21/33°C

21st Jul 2026426 AMAQI
21st Jul 2026347 AMAQI
21st Jul 2026458 AMAQI
21st Jul 2026499 AMAQI
21st Jul 20263610 AMAQI
21st Jul 20263811 AMAQI
21st Jul 20264612 PMAQI
21st Jul 2026511 PMAQI
21st Jul 2026322 PMAQI
21st Jul 2026443 PMAQI
21st Jul 2026404 PMAQI
21st Jul 2026375 PMAQI
21st Jul 2026436 PMAQI
21st Jul 2026477 PMAQI
21st Jul 2026508 PMAQI
21st Jul 2026349 PMAQI
21st Jul 20265310 PMAQI
21st Jul 20264611 PMAQI
22nd Jul 20264212 AMAQI
22nd Jul 2026401 AMAQI
22nd Jul 2026322 AMAQI
22nd Jul 2026373 AMAQI
22nd Jul 2026384 AMAQI
22nd Jul 2026325 AMAQI

28°C22/34°C

22nd Jul 2026386 AMAQI
22nd Jul 2026467 AMAQI
22nd Jul 2026518 AMAQI
22nd Jul 2026439 AMAQI
22nd Jul 20264510 AMAQI
22nd Jul 20263611 AMAQI
22nd Jul 20262212 PMAQI
22nd Jul 2026441 PMAQI
22nd Jul 2026342 PMAQI
22nd Jul 2026343 PMAQI
22nd Jul 2026344 PMAQI
22nd Jul 2026415 PMAQI
22nd Jul 2026486 PMAQI
22nd Jul 2026347 PMAQI
22nd Jul 2026348 PMAQI
22nd Jul 2026369 PMAQI
22nd Jul 20263610 PMAQI
22nd Jul 20264611 PMAQI
23rd Jul 20262712 AMAQI
23rd Jul 2026361 AMAQI
23rd Jul 2026332 AMAQI
23rd Jul 2026363 AMAQI
23rd Jul 2026374 AMAQI
23rd Jul 2026255 AMAQI

24°C19/29°C

23rd Jul 2026366 AMAQI
23rd Jul 2026387 AMAQI
23rd Jul 2026648 AMAQI
23rd Jul 2026369 AMAQI
23rd Jul 20263610 AMAQI
23rd Jul 20262211 AMAQI
23rd Jul 20262112 PMAQI
23rd Jul 2026431 PMAQI
23rd Jul 2026312 PMAQI
23rd Jul 2026383 PMAQI
23rd Jul 2026454 PMAQI
23rd Jul 2026455 PMAQI
23rd Jul 2026566 PMAQI
23rd Jul 2026437 PMAQI
23rd Jul 2026448 PMAQI
23rd Jul 2026309 PMAQI
23rd Jul 20263710 PMAQI
23rd Jul 20264811 PMAQI
24th Jul 20264412 AMAQI
24th Jul 2026491 AMAQI
24th Jul 2026432 AMAQI
24th Jul 2026423 AMAQI
24th Jul 2026374 AMAQI
24th Jul 2026425 AMAQI

24°C18/31°C

24th Jul 2026416 AMAQI
24th Jul 2026407 AMAQI
24th Jul 2026648 AMAQI
24th Jul 2026489 AMAQI
24th Jul 20264610 AMAQI
24th Jul 20264911 AMAQI
24th Jul 20264612 PMAQI
24th Jul 2026321 PMAQI
24th Jul 2026382 PMAQI
24th Jul 2026413 PMAQI
24th Jul 2026324 PMAQI
24th Jul 2026465 PMAQI
24th Jul 2026596 PMAQI
24th Jul 2026407 PMAQI
24th Jul 2026418 PMAQI
24th Jul 2026529 PMAQI
24th Jul 20264910 PMAQI
24th Jul 20264811 PMAQI
25th Jul 20264112 AMAQI
25th Jul 2026591 AMAQI
25th Jul 2026442 AMAQI
25th Jul 2026503 AMAQI
25th Jul 2026474 AMAQI
25th Jul 2026465 AMAQI

26°C20/33°C

25th Jul 2026436 AMAQI
25th Jul 2026477 AMAQI
25th Jul 2026388 AMAQI
25th Jul 2026549 AMAQI
25th Jul 20264410 AMAQI
25th Jul 20266611 AMAQI
25th Jul 20264612 PMAQI
25th Jul 2026501 PMAQI
25th Jul 2026432 PMAQI
25th Jul 2026433 PMAQI
25th Jul 2026364 PMAQI
25th Jul 2026445 PMAQI
25th Jul 2026266 PMAQI
25th Jul 2026437 PMAQI
25th Jul 2026368 PMAQI
25th Jul 2026479 PMAQI
25th Jul 20263210 PMAQI
25th Jul 20264211 PMAQI
26th Jul 20263612 AMAQI
26th Jul 2026501 AMAQI
26th Jul 2026372 AMAQI
26th Jul 2026363 AMAQI
26th Jul 2026364 AMAQI
26th Jul 2026405 AMAQI

26°C19/32°C

26th Jul 2026306 AMAQI
26th Jul 2026427 AMAQI
26th Jul 2026418 AMAQI
26th Jul 2026239 AMAQI
26th Jul 20264010 AMAQI
26th Jul 20264811 AMAQI
26th Jul 20263812 PMAQI
26th Jul 2026411 PMAQI
26th Jul 2026402 PMAQI
26th Jul 2026433 PMAQI
26th Jul 2026304 PMAQI
26th Jul 2026345 PMAQI
26th Jul 2026406 PMAQI
26th Jul 2026247 PMAQI
26th Jul 2026368 PMAQI
26th Jul 2026489 PMAQI
26th Jul 20264610 PMAQI
26th Jul 20264411 PMAQI
27th Jul 20264912 AMAQI
27th Jul 2026431 AMAQI
27th Jul 2026322 AMAQI
27th Jul 2026403 AMAQI
27th Jul 2026434 AMAQI
27th Jul 2026425 AMAQI

25°C20/32°C

27th Jul 2026356 AMAQI
27th Jul 2026367 AMAQI
27th Jul 2026488 AMAQI
27th Jul 2026369 AMAQI
27th Jul 20265110 AMAQI
27th Jul 20264611 AMAQI
27th Jul 20264112 PMAQI
27th Jul 2026531 PMAQI
27th Jul 2026392 PMAQI
27th Jul 2026493 PMAQI
27th Jul 2026284 PMAQI
27th Jul 2026405 PMAQI
27th Jul 2026476 PMAQI
27th Jul 2026267 PMAQI
27th Jul 2026408 PMAQI
27th Jul 2026439 PMAQI
27th Jul 20264210 PMAQI
27th Jul 20264611 PMAQI
28th Jul 20263712 AMAQI
28th Jul 2026451 AMAQI
28th Jul 2026382 AMAQI
28th Jul 2026443 AMAQI
28th Jul 2026444 AMAQI
28th Jul 2026405 AMAQI

25°C19/32°C

28th Jul 2026366 AMAQI
28th Jul 2026357 AMAQI
28th Jul 2026328 AMAQI
28th Jul 2026429 AMAQI
28th Jul 20264010 AMAQI
28th Jul 20264011 AMAQI
28th Jul 20264712 PMAQI
28th Jul 2026411 PMAQI
28th Jul 2026372 PMAQI
28th Jul 2026493 PMAQI
28th Jul 2026394 PMAQI
28th Jul 2026295 PMAQI
28th Jul 2026406 PMAQI
28th Jul 2026427 PMAQI
28th Jul 2026418 PMAQI
28th Jul 2026449 PMAQI
28th Jul 20264410 PMAQI
28th Jul 20264811 PMAQI
29th Jul 20264012 AMAQI
29th Jul 2026471 AMAQI
29th Jul 2026402 AMAQI
29th Jul 2026443 AMAQI
29th Jul 2026424 AMAQI
29th Jul 2026395 AMAQI

25°C19/32°C

29th Jul 2026396 AMAQI
29th Jul 2026467 AMAQI
29th Jul 2026458 AMAQI
29th Jul 2026509 AMAQI
29th Jul 20264210 AMAQI
29th Jul 20263911 AMAQI
29th Jul 20264512 PMAQI
29th Jul 2026471 PMAQI
29th Jul 2026462 PMAQI
29th Jul 2026393 PMAQI
29th Jul 2026434 PMAQI
29th Jul 2026405 PMAQI
29th Jul 2026366 PMAQI
29th Jul 2026377 PMAQI
29th Jul 2026428 PMAQI
29th Jul 2026489 PMAQI
29th Jul 20264810 PMAQI
29th Jul 20264511 PMAQI
30th Jul 20264712 AMAQI
30th Jul 2026401 AMAQI
30th Jul 2026482 AMAQI
30th Jul 2026483 AMAQI
30th Jul 2026394 AMAQI
30th Jul 2026415 AMAQI

26°C20/33°C

30th Jul 2026436 AMAQI
30th Jul 2026407 AMAQI
30th Jul 2026438 AMAQI
30th Jul 2026449 AMAQI
30th Jul 20264410 AMAQI
30th Jul 20265111 AMAQI
30th Jul 20264912 PMAQI
30th Jul 2026521 PMAQI
30th Jul 2026502 PMAQI
30th Jul 2026503 PMAQI
30th Jul 2026404 PMAQI
30th Jul 2026395 PMAQI
30th Jul 2026486 PMAQI
30th Jul 2026547 PMAQI
30th Jul 2026448 PMAQI
30th Jul 2026569 PMAQI
30th Jul 20264910 PMAQI
30th Jul 20265111 PMAQI
31st Jul 20264812 AMAQI
31st Jul 2026481 AMAQI
31st Jul 2026442 AMAQI
31st Jul 2026453 AMAQI
31st Jul 2026484 AMAQI
31st Jul 2026565 AMAQI

27°C20/34°C

31st Jul 2026476 AMAQI
31st Jul 2026577 AMAQI
31st Jul 2026538 AMAQI
31st Jul 2026569 AMAQI
31st Jul 20265910 AMAQI
31st Jul 20265611 AMAQI
31st Jul 20265612 PMAQI
31st Jul 2026581 PMAQI
31st Jul 2026522 PMAQI
31st Jul 2026543 PMAQI
31st Jul 2026544 PMAQI
31st Jul 2026575 PMAQI
31st Jul 2026566 PMAQI
31st Jul 2026507 PMAQI
31st Jul 2026568 PMAQI
31st Jul 2026589 PMAQI
31st Jul 20265510 PMAQI
31st Jul 20266211 PMAQI
1st Aug 20265712 AMAQI
1st Aug 2026581 AMAQI
1st Aug 2026562 AMAQI
1st Aug 2026543 AMAQI
1st Aug 2026524 AMAQI
1st Aug 2026465 AMAQI

28°C21/35°C

1st Aug 2026466 AMAQI
1st Aug 2026447 AMAQI
1st Aug 2026458 AMAQI
1st Aug 2026529 AMAQI
1st Aug 20265010 AMAQI
1st Aug 20265011 AMAQI
1st Aug 20264612 PMAQI
1st Aug 2026511 PMAQI
1st Aug 2026462 PMAQI
1st Aug 2026463 PMAQI
1st Aug 2026434 PMAQI
1st Aug 2026475 PMAQI
1st Aug 2026416 PMAQI
1st Aug 2026447 PMAQI
1st Aug 2026458 PMAQI
1st Aug 2026439 PMAQI
1st Aug 20264110 PMAQI
1st Aug 20264711 PMAQI
2nd Aug 20264612 AMAQI
2nd Aug 2026451 AMAQI
2nd Aug 2026442 AMAQI
2nd Aug 2026523 AMAQI
2nd Aug 2026444 AMAQI
2nd Aug 2026465 AMAQI

28°C22/35°C

2nd Aug 2026476 AMAQI
2nd Aug 2026427 AMAQI
2nd Aug 2026428 AMAQI
2nd Aug 2026469 AMAQI
2nd Aug 20264710 AMAQI
2nd Aug 20264811 AMAQI
2nd Aug 20264612 PMAQI
2nd Aug 2026481 PMAQI
2nd Aug 2026462 PMAQI
2nd Aug 2026483 PMAQI
2nd Aug 2026504 PMAQI
2nd Aug 2026485 PMAQI
2nd Aug 2026346 PMAQI
2nd Aug 2026447 PMAQI
2nd Aug 2026418 PMAQI
2nd Aug 2026479 PMAQI
2nd Aug 20264410 PMAQI
2nd Aug 20264511 PMAQI
3rd Aug 20264012 AMAQI
3rd Aug 2026411 AMAQI
3rd Aug 2026462 AMAQI
3rd Aug 2026383 AMAQI
3rd Aug 2026324 AMAQI
3rd Aug 2026445 AMAQI

29°C22/35°C

3rd Aug 2026416 AMAQI
3rd Aug 2026437 AMAQI
3rd Aug 2026448 AMAQI
3rd Aug 2026469 AMAQI
3rd Aug 20264610 AMAQI
3rd Aug 20264311 AMAQI
3rd Aug 20264812 PMAQI
3rd Aug 2026481 PMAQI
3rd Aug 2026462 PMAQI
3rd Aug 2026453 PMAQI
3rd Aug 2026494 PMAQI
3rd Aug 2026425 PMAQI
3rd Aug 2026436 PMAQI
3rd Aug 2026447 PMAQI
3rd Aug 2026508 PMAQI
3rd Aug 2026479 PMAQI
3rd Aug 20264810 PMAQI
3rd Aug 20265211 PMAQI
4th Aug 20264612 AMAQI
4th Aug 2026471 AMAQI
4th Aug 2026502 AMAQI
4th Aug 2026453 AMAQI
4th Aug 2026424 AMAQI
4th Aug 2026445 AMAQI

29°C22/36°C

4th Aug 2026506 AMAQI
4th Aug 2026507 AMAQI
4th Aug 2026478 AMAQI
4th Aug 2026509 AMAQI
4th Aug 20264410 AMAQI
4th Aug 20264911 AMAQI
4th Aug 20264812 PMAQI
4th Aug 2026501 PMAQI
4th Aug 2026522 PMAQI
4th Aug 2026503 PMAQI
4th Aug 2026464 PMAQI
4th Aug 2026485 PMAQI
4th Aug 2026526 PMAQI
4th Aug 2026587 PMAQI
4th Aug 2026548 PMAQI
4th Aug 2026569 PMAQI
4th Aug 20265510 PMAQI
4th Aug 20265611 PMAQI
5th Aug 20265612 AMAQI
5th Aug 2026601 AMAQI
5th Aug 2026602 AMAQI
5th Aug 2026603 AMAQI
5th Aug 2026584 AMAQI
5th Aug 2026615 AMAQI

29°C23/36°C

5th Aug 2026626 AMAQI
5th Aug 2026627 AMAQI
5th Aug 2026588 AMAQI
5th Aug 2026619 AMAQI
5th Aug 20265910 AMAQI
5th Aug 20266811 AMAQI
5th Aug 20267012 PMAQI
5th Aug 2026731 PMAQI
5th Aug 2026672 PMAQI
5th Aug 2026723 PMAQI
5th Aug 2026644 PMAQI
5th Aug 2026665 PMAQI
5th Aug 2026606 PMAQI
5th Aug 2026587 PMAQI
5th Aug 2026588 PMAQI
5th Aug 2026599 PMAQI
5th Aug 20266110 PMAQI
5th Aug 20266611 PMAQI
6th Aug 20266012 AMAQI
6th Aug 2026691 AMAQI
6th Aug 2026622 AMAQI
6th Aug 2026603 AMAQI
6th Aug 2026564 AMAQI
6th Aug 2026545 AMAQI

28°C22/35°C

6th Aug 2026476 AMAQI
6th Aug 2026467 AMAQI
6th Aug 2026478 AMAQI
6th Aug 2026539 AMAQI
6th Aug 20265410 AMAQI
6th Aug 20265811 AMAQI
6th Aug 20265812 PMAQI
6th Aug 2026601 PMAQI
6th Aug 2026622 PMAQI
6th Aug 2026613 PMAQI
6th Aug 2026614 PMAQI
6th Aug 2026575 PMAQI
6th Aug 2026566 PMAQI
6th Aug 2026527 PMAQI
6th Aug 2026548 PMAQI
6th Aug 2026589 PMAQI
6th Aug 20266510 PMAQI
6th Aug 20266811 PMAQI
7th Aug 20266612 AMAQI
7th Aug 2026641 AMAQI
7th Aug 2026642 AMAQI
7th Aug 2026643 AMAQI
7th Aug 2026584 AMAQI
7th Aug 2026565 AMAQI

29°C23/37°C

7th Aug 2026546 AMAQI
7th Aug 2026567 AMAQI
7th Aug 2026568 AMAQI
7th Aug 2026549 AMAQI
7th Aug 20265510 AMAQI
7th Aug 20265311 AMAQI
7th Aug 20264812 PMAQI
7th Aug 2026521 PMAQI
7th Aug 2026412 PMAQI
7th Aug 2026423 PMAQI
7th Aug 2026484 PMAQI
7th Aug 2026475 PMAQI
7th Aug 2026506 PMAQI
7th Aug 2026467 PMAQI
7th Aug 2026508 PMAQI
7th Aug 2026449 PMAQI
7th Aug 20264510 PMAQI
7th Aug 20264911 PMAQI
8th Aug 20264212 AMAQI
8th Aug 2026381 AMAQI
8th Aug 2026442 AMAQI
8th Aug 2026453 AMAQI
8th Aug 2026454 AMAQI
8th Aug 2026445 AMAQI

30°C25/38°C

8th Aug 2026476 AMAQI
8th Aug 2026457 AMAQI
8th Aug 2026388 AMAQI
8th Aug 2026469 AMAQI
8th Aug 20264510 AMAQI
8th Aug 20264211 AMAQI
8th Aug 20264712 PMAQI
8th Aug 2026411 PMAQI
8th Aug 2026432 PMAQI
8th Aug 2026443 PMAQI
8th Aug 2026444 PMAQI
8th Aug 2026435 PMAQI
8th Aug 2026456 PMAQI
8th Aug 2026457 PMAQI
8th Aug 2026428 PMAQI
8th Aug 2026429 PMAQI
8th Aug 20264910 PMAQI
8th Aug 20264311 PMAQI
9th Aug 20264112 AMAQI
9th Aug 2026401 AMAQI
9th Aug 2026412 AMAQI
9th Aug 2026453 AMAQI
9th Aug 2026484 AMAQI
9th Aug 2026405 AMAQI

30°C25/36°C

9th Aug 2026416 AMAQI
9th Aug 2026427 AMAQI
9th Aug 2026448 AMAQI
9th Aug 2026469 AMAQI
9th Aug 20264610 AMAQI
9th Aug 20264311 AMAQI
9th Aug 20264112 PMAQI
9th Aug 2026451 PMAQI
9th Aug 2026482 PMAQI
9th Aug 2026443 PMAQI
9th Aug 2026464 PMAQI
9th Aug 2026485 PMAQI
9th Aug 2026486 PMAQI
9th Aug 2026417 PMAQI
9th Aug 2026498 PMAQI
9th Aug 2026419 PMAQI
9th Aug 20263310 PMAQI
9th Aug 20265211 PMAQI
10th Aug 20265312 AMAQI
10th Aug 2026481 AMAQI
10th Aug 2026472 AMAQI
10th Aug 2026503 AMAQI
10th Aug 2026514 AMAQI
10th Aug 2026485 AMAQI

30°C24/37°C

10th Aug 2026536 AMAQI
10th Aug 2026367 AMAQI
10th Aug 2026428 AMAQI
10th Aug 2026529 AMAQI
10th Aug 20265210 AMAQI
10th Aug 20265011 AMAQI
10th Aug 20265012 PMAQI
10th Aug 2026471 PMAQI
10th Aug 2026462 PMAQI
10th Aug 2026503 PMAQI
10th Aug 2026504 PMAQI
10th Aug 2026485 PMAQI
10th Aug 2026496 PMAQI
10th Aug 2026487 PMAQI
10th Aug 2026488 PMAQI
10th Aug 2026489 PMAQI
10th Aug 20264610 PMAQI
10th Aug 20264411 PMAQI
11th Aug 20264312 AMAQI
11th Aug 2026441 AMAQI
11th Aug 2026462 AMAQI
11th Aug 2026453 AMAQI
11th Aug 2026474 AMAQI
11th Aug 2026415 AMAQI

29°C24/35°C

11th Aug 2026446 AMAQI
11th Aug 2026447 AMAQI
11th Aug 2026468 AMAQI
11th Aug 2026469 AMAQI
11th Aug 20264410 AMAQI
11th Aug 20264411 AMAQI
11th Aug 20264612 PMAQI
11th Aug 2026461 PMAQI
11th Aug 2026462 PMAQI
11th Aug 2026423 PMAQI
11th Aug 2026444 PMAQI
11th Aug 2026455 PMAQI
11th Aug 2026456 PMAQI
11th Aug 2026487 PMAQI
11th Aug 2026488 PMAQI
11th Aug 2026509 PMAQI
11th Aug 20265210 PMAQI
11th Aug 20265111 PMAQI
12th Aug 20265112 AMAQI
12th Aug 2026491 AMAQI
12th Aug 2026482 AMAQI
12th Aug 2026463 AMAQI
12th Aug 2026464 AMAQI
12th Aug 2026465 AMAQI

27°C21/34°C

12th Aug 2026416 AMAQI
12th Aug 2026447 AMAQI
12th Aug 2026458 AMAQI
12th Aug 2026509 AMAQI
12th Aug 20265010 AMAQI
12th Aug 20265011 AMAQI
12th Aug 20265212 PMAQI
12th Aug 2026481 PMAQI
12th Aug 2026462 PMAQI
12th Aug 2026483 PMAQI
12th Aug 2026464 PMAQI
12th Aug 2026435 PMAQI
12th Aug 2026456 PMAQI
12th Aug 2026507 PMAQI
12th Aug 2026508 PMAQI
12th Aug 2026489 PMAQI
12th Aug 20265210 PMAQI
12th Aug 20264811 PMAQI
13th Aug 20264812 AMAQI
13th Aug 2026521 AMAQI
13th Aug 2026522 AMAQI
13th Aug 2026533 AMAQI
13th Aug 2026484 AMAQI
13th Aug 2026485 AMAQI

25°C19/32°C

13th Aug 2026496 AMAQI
6 AM
13th Aug 2026457 AMAQI
13th Aug 2026468 AMAQI
13th Aug 2026529 AMAQI
13th Aug 20265010 AMAQI
13th Aug 20265411 AMAQI
13th Aug 20265112 PMAQI
13th Aug 2026561 PMAQI
1 PM
13th Aug 2026562 PMAQI
13th Aug 2026513 PMAQI
13th Aug 2026504 PMAQI
13th Aug 2026445 PMAQI
13th Aug 2026416 PMAQI
13th Aug 2026497 PMAQI
13th Aug 2026508 PMAQI
8 PM
13th Aug 2026539 PMAQI
13th Aug 20265010 PMAQI
13th Aug 20265311 PMAQI
1 AM
5 AM

22°C17/28°C

Day time
Avg. Highest Time
1 PM

46AQI

1 hours / Day
30 hours / Month
Avg. Lowest Time
6 AM - 7 AM

42AQI

2 hours / Day
60 hours / Month
In the last 30 days, during the daytime, the highest AQI was between 1 PM to 1 PM (Avg. 46), while the lowest AQI was between 6 AM to 7 AM (Avg. 42).
Night time
Avg. Highest Time
11 PM

48AQI

1 hours / Day
30 hours / Month
Avg. Lowest Time
4 AM - 5 AM

42AQI

2 hours / Day
60 hours / Month
In the last 30 days, during the daytime, the highest AQI was between 11 PM to 11 PM (Avg. 48), while the lowest AQI was between 4 AM to 5 AM (Avg. 42).

2026 Days Vs Air Quality

Grass Valley, California, United States

2026

98%

217

2%

4

Total number of days with different AQI categories in last 225 days in 2026 (140 days remaining)

Good
217 Days
Moderate
4 Days
Poor
0 Days
Unhealthy
0 Days
Severe
0 Days
Hazardous
0 Days

Under WHO’s Safe Air Quality Limits: 98%

Health Risk Level:

Very Low

In 2026, 98% of 225 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

Grass Valley, California, United States

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
28AQI (US)
2nd January 2026
18AQI (US)
3rd January 2026
16AQI (US)
4th January 2026
18AQI (US)
5th January 2026
20AQI (US)
6th January 2026
27AQI (US)
7th January 2026
30AQI (US)
8th January 2026
19AQI (US)
9th January 2026
24AQI (US)
10th January 2026
34AQI (US)
11th January 2026
39AQI (US)
12th January 2026
42AQI (US)
13th January 2026
36AQI (US)
14th January 2026
42AQI (US)
15th January 2026
42AQI (US)
16th January 2026
39AQI (US)
17th January 2026
39AQI (US)
18th January 2026
41AQI (US)
19th January 2026
38AQI (US)
20th January 2026
39AQI (US)
21st January 2026
32AQI (US)
22nd January 2026
33AQI (US)
23rd January 2026
36AQI (US)
24th January 2026
28AQI (US)
25th January 2026
25AQI (US)
26th January 2026
28AQI (US)
27th January 2026
24AQI (US)
28th January 2026
34AQI (US)
29th January 2026
35AQI (US)
30th January 2026
44AQI (US)
31st January 2026
32AQI (US)
1st February 2026
36AQI (US)
2nd February 2026
30AQI (US)
3rd February 2026
28AQI (US)
4th February 2026
26AQI (US)
5th February 2026
30AQI (US)
6th February 2026
30AQI (US)
7th February 2026
28AQI (US)
8th February 2026
28AQI (US)
9th February 2026
38AQI (US)
10th February 2026
24AQI (US)
11th February 2026
40AQI (US)
12th February 2026
44AQI (US)
13th February 2026
34AQI (US)
14th February 2026
30AQI (US)
15th February 2026
28AQI (US)
16th February 2026
39AQI (US)
17th February 2026
48AQI (US)
18th February 2026
44AQI (US)
19th February 2026
45AQI (US)
20th February 2026
32AQI (US)
21st February 2026
26AQI (US)
22nd February 2026
30AQI (US)
23rd February 2026
30AQI (US)
24th February 2026
34AQI (US)
25th February 2026
38AQI (US)
26th February 2026
22AQI (US)
27th February 2026
24AQI (US)
28th February 2026
20AQI (US)
1st March 2026
24AQI (US)
2nd March 2026
41AQI (US)
3rd March 2026
22AQI (US)
4th March 2026
28AQI (US)
5th March 2026
32AQI (US)
6th March 2026
23AQI (US)
7th March 2026
28AQI (US)
8th March 2026
22AQI (US)
9th March 2026
18AQI (US)
10th March 2026
20AQI (US)
11th March 2026
24AQI (US)
12th March 2026
20AQI (US)
13th March 2026
22AQI (US)
14th March 2026
18AQI (US)
15th March 2026
16AQI (US)
16th March 2026
18AQI (US)
17th March 2026
24AQI (US)
18th March 2026
22AQI (US)
19th March 2026
22AQI (US)
20th March 2026
26AQI (US)
21st March 2026
24AQI (US)
22nd March 2026
18AQI (US)
23rd March 2026
18AQI (US)
24th March 2026
18AQI (US)
25th March 2026
19AQI (US)
26th March 2026
24AQI (US)
27th March 2026
20AQI (US)
28th March 2026
20AQI (US)
29th March 2026
19AQI (US)
30th March 2026
23AQI (US)
31st March 2026
22AQI (US)
1st April 2026
28AQI (US)
2nd April 2026
24AQI (US)
3rd April 2026
22AQI (US)
4th April 2026
16AQI (US)
5th April 2026
20AQI (US)
6th April 2026
22AQI (US)
7th April 2026
22AQI (US)
8th April 2026
28AQI (US)
9th April 2026
24AQI (US)
10th April 2026
27AQI (US)
11th April 2026
34AQI (US)
12th April 2026
30AQI (US)
13th April 2026
32AQI (US)
14th April 2026
30AQI (US)
15th April 2026
25AQI (US)
16th April 2026
20AQI (US)
17th April 2026
18th April 2026
16AQI (US)
19th April 2026
16AQI (US)
20th April 2026
18AQI (US)
21st April 2026
26AQI (US)
22nd April 2026
23rd April 2026
24AQI (US)
24th April 2026
20AQI (US)
25th April 2026
15AQI (US)
26th April 2026
14AQI (US)
27th April 2026
14AQI (US)
28th April 2026
14AQI (US)
29th April 2026
16AQI (US)
30th April 2026
18AQI (US)
1st May 2026
20AQI (US)
2nd May 2026
18AQI (US)
3rd May 2026
16AQI (US)
4th May 2026
24AQI (US)
5th May 2026
32AQI (US)
6th May 2026
24AQI (US)
7th May 2026
16AQI (US)
8th May 2026
20AQI (US)
9th May 2026
10th May 2026
22AQI (US)
11th May 2026
20AQI (US)
12th May 2026
24AQI (US)
13th May 2026
22AQI (US)
14th May 2026
22AQI (US)
15th May 2026
24AQI (US)
16th May 2026
30AQI (US)
17th May 2026
34AQI (US)
18th May 2026
30AQI (US)
19th May 2026
26AQI (US)
20th May 2026
26AQI (US)
21st May 2026
28AQI (US)
22nd May 2026
27AQI (US)
23rd May 2026
22AQI (US)
24th May 2026
26AQI (US)
25th May 2026
22AQI (US)
26th May 2026
18AQI (US)
27th May 2026
24AQI (US)
28th May 2026
22AQI (US)
29th May 2026
20AQI (US)
30th May 2026
12AQI (US)
31st May 2026
14AQI (US)
1st June 2026
18AQI (US)
2nd June 2026
14AQI (US)
3rd June 2026
16AQI (US)
4th June 2026
14AQI (US)
5th June 2026
16AQI (US)
6th June 2026
18AQI (US)
7th June 2026
15AQI (US)
8th June 2026
14AQI (US)
9th June 2026
22AQI (US)
10th June 2026
16AQI (US)
11th June 2026
17AQI (US)
12th June 2026
17AQI (US)
13th June 2026
14AQI (US)
14th June 2026
14AQI (US)
15th June 2026
15AQI (US)
16th June 2026
18AQI (US)
17th June 2026
18AQI (US)
18th June 2026
18AQI (US)
19th June 2026
18AQI (US)
20th June 2026
19AQI (US)
21st June 2026
17AQI (US)
22nd June 2026
14AQI (US)
23rd June 2026
16AQI (US)
24th June 2026
15AQI (US)
25th June 2026
16AQI (US)
26th June 2026
15AQI (US)
27th June 2026
25AQI (US)
28th June 2026
16AQI (US)
29th June 2026
20AQI (US)
30th June 2026
14AQI (US)
1st July 2026
20AQI (US)
2nd July 2026
24AQI (US)
3rd July 2026
20AQI (US)
4th July 2026
16AQI (US)
5th July 2026
23AQI (US)
6th July 2026
18AQI (US)
7th July 2026
20AQI (US)
8th July 2026
16AQI (US)
9th July 2026
17AQI (US)
10th July 2026
20AQI (US)
11th July 2026
17AQI (US)
12th July 2026
14AQI (US)
13th July 2026
18AQI (US)
14th July 2026
18AQI (US)
15th July 2026
16AQI (US)
16th July 2026
18AQI (US)
17th July 2026
33AQI (US)
18th July 2026
43AQI (US)
19th July 2026
43AQI (US)
20th July 2026
44AQI (US)
21st July 2026
42AQI (US)
22nd July 2026
38AQI (US)
23rd July 2026
38AQI (US)
24th July 2026
44AQI (US)
25th July 2026
44AQI (US)
26th July 2026
38AQI (US)
27th July 2026
42AQI (US)
28th July 2026
40AQI (US)
29th July 2026
42AQI (US)
30th July 2026
46AQI (US)
31st July 2026
54AQI (US)
1st August 2026
48AQI (US)
2nd August 2026
46AQI (US)
3rd August 2026
44AQI (US)
4th August 2026
50AQI (US)
5th August 2026
62AQI (US)
6th August 2026
58AQI (US)
7th August 2026
52AQI (US)
8th August 2026
44AQI (US)
9th August 2026
44AQI (US)
10th August 2026
48AQI (US)
11th August 2026
46AQI (US)
12th August 2026
48AQI (US)
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

32AQI (US)

32AQI (US)

22AQI (US)

22AQI (US)

23AQI (US)

17AQI (US)

30AQI (US)

49AQI (US)

No. of days

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

202627AQI (US)

31
28
31
28
30
30
30
1
9
3
217
4

Highest AQI (US) recorded in

August

49AQI (US)

Lowest AQI (US) recorded in

June

17AQI (US)

202534AQI (US)

29
2
28
31
30
31
30
27
4
30
1
30
23
8
26
4
24
7
339
26

Highest AQI (US) recorded in

October

44AQI (US)

Lowest AQI (US) recorded in

May

25AQI (US)

202433AQI (US)

31
29
31
30
31
29
30
1
23
8
29
1
31
29
1
31
354
11

Highest AQI (US) recorded in

August

45AQI (US)

Lowest AQI (US) recorded in

January

22AQI (US)

202338AQI (US)

31
24
4
30
1
30
29
2
27
3
22
9
27
4
26
4
28
2
29
31
334
29

Highest AQI (US) recorded in

July

47AQI (US)

Lowest AQI (US) recorded in

December

27AQI (US)

202236AQI (US)

29
1
22
31
17
31
29
1
17
4
1
2
18
7
3
1
29
2
29
1
31
284
18
3
1

Highest AQI (US) recorded in

September

56AQI (US)

Lowest AQI (US) recorded in

March

28AQI (US)

202139AQI (US)

30
28
31
29
1
31
29
1
24
7
9
6
11
4
1
15
15
29
2
29
1
29
313
33
11
4
1

Highest AQI (US) recorded in

August

100AQI (US)

Lowest AQI (US) recorded in

January

26AQI (US)

202049AQI (US)

1
12
19
30
31
16
3
7
5
7
7
12
2
1
21
6
2
30
31
198
16
21
5
2
1

Highest AQI (US) recorded in

September

107AQI (US)

Lowest AQI (US) recorded in

March

26AQI (US)

Most & Least Polluted Years Over the Last 7 Years

Most Polluted Year Recorded
2020(Avg.)
49AQI (US)
Least Polluted Year Recorded
2026(Avg.)
27AQI (US)

Grass Valley's annual 2026 AQI (US) (27) shows an average percentage change of -28.06% (improved AQI (US)) compared to previous years: 2020 (49), 2021 (39), 2022 (36), 2023 (38), 2024 (33), 2025 (34).