Guerneville, Windsor, 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+
October Air Quality Analysis
Guerneville, Windsor, California, United States
2024
2025
AQI
.
Days
AQI Trends: Highest and Lowest
Highest AQI recorded on
4th Oct 2025
61AQILowest AQI recorded on
16th Oct 2024
16AQISame Day Analysis (30th October ):
On this day, AQI across the 2 years varied significantly: 2025 ranks 1st highest AQI at 35 of Good air quality on the same day.
Download 2024 Annual Data
World Air Quality Report
Day & Night AQI Trend: 30th Oct - 31st Oct 2025
Guerneville, Windsor, California, United States
AQI
Day
Night
.
7 AM30th Oct 2025
6 PM
6 AM31st Oct 2025
Day time
Avg. Highest Time
9AM30th Oct
46AQI
Avg. Lowest Time
5PM30th Oct
28AQI
Night time
Avg. Highest Time
9PM30th Oct
50AQI
Avg. Lowest Time
2AM31st Oct
27AQI
In the last 24 hours,
Guerneville's AQI reached its highest point of 50 at 9 PM during the Night, while the lowest point, 27, was recorded at 2 AM during the Night between 30th Oct and 31st Oct 2025.
Day & Night AQI Trend : Oct 2025
Guerneville, Windsor, California, United States
Oct
01st - 02nd02nd - 03rd03rd - 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
Day
Night
1st Oct 2025127 AMAQI
1st Oct 2025138 AMAQI
1st Oct 2025189 AMAQI
1st Oct 20252010 AMAQI
1st Oct 20252111 AMAQI
1st Oct 20252012 PMAQI
1st Oct 2025191 PMAQI
1st Oct 2025182 PMAQI
1st Oct 2025193 PMAQI
1st Oct 2025194 PMAQI
1st Oct 2025205 PMAQI
1st Oct 2025186 PMAQI
1st Oct 2025247 PMAQI
1st Oct 2025408 PMAQI
1st Oct 2025309 PMAQI
1st Oct 20251910 PMAQI
1st Oct 20251811 PMAQI
2nd Oct 20251912 AMAQI
2nd Oct 2025361 AMAQI
2nd Oct 2025422 AMAQI
2nd Oct 2025253 AMAQI
2nd Oct 2025204 AMAQI
2nd Oct 2025195 AMAQI
2nd Oct 2025206 AMAQI
17°C16/20°C
2nd Oct 2025197 AMAQI
2nd Oct 2025218 AMAQI
2nd Oct 2025229 AMAQI
2nd Oct 20252210 AMAQI
2nd Oct 20252411 AMAQI
2nd Oct 20253012 PMAQI
2nd Oct 2025491 PMAQI
2nd Oct 2025302 PMAQI
2nd Oct 2025303 PMAQI
2nd Oct 2025554 PMAQI
2nd Oct 2025465 PMAQI
2nd Oct 2025386 PMAQI
2nd Oct 2025457 PMAQI
2nd Oct 2025518 PMAQI
2nd Oct 2025449 PMAQI
2nd Oct 20253810 PMAQI
2nd Oct 20254211 PMAQI
3rd Oct 20255212 AMAQI
3rd Oct 2025371 AMAQI
3rd Oct 2025362 AMAQI
3rd Oct 2025373 AMAQI
3rd Oct 2025274 AMAQI
3rd Oct 2025245 AMAQI
3rd Oct 2025236 AMAQI
17°C13/23°C
3rd Oct 2025257 AMAQI
3rd Oct 2025238 AMAQI
3rd Oct 2025249 AMAQI
3rd Oct 20253210 AMAQI
3rd Oct 20254211 AMAQI
3rd Oct 20253112 PMAQI
3rd Oct 2025301 PMAQI
3rd Oct 2025382 PMAQI
3rd Oct 2025363 PMAQI
3rd Oct 2025224 PMAQI
3rd Oct 2025365 PMAQI
3rd Oct 2025626 PMAQI
3rd Oct 2025437 PMAQI
3rd Oct 2025318 PMAQI
3rd Oct 2025539 PMAQI
3rd Oct 20255510 PMAQI
3rd Oct 20255011 PMAQI
4th Oct 20255312 AMAQI
4th Oct 2025441 AMAQI
4th Oct 2025512 AMAQI
4th Oct 2025553 AMAQI
4th Oct 2025544 AMAQI
4th Oct 2025505 AMAQI
4th Oct 2025506 AMAQI
18°C12/24°C
4th Oct 2025437 AMAQI
4th Oct 2025428 AMAQI
4th Oct 2025249 AMAQI
4th Oct 20252810 AMAQI
4th Oct 20254811 AMAQI
4th Oct 20255812 PMAQI
4th Oct 2025651 PMAQI
4th Oct 2025602 PMAQI
4th Oct 2025613 PMAQI
4th Oct 2025604 PMAQI
4th Oct 2025855 PMAQI
4th Oct 20251076 PMAQI
4th Oct 20251027 PMAQI
4th Oct 2025968 PMAQI
4th Oct 2025829 PMAQI
4th Oct 20254610 PMAQI
4th Oct 20255811 PMAQI
5th Oct 20255312 AMAQI
5th Oct 2025411 AMAQI
5th Oct 2025302 AMAQI
5th Oct 2025493 AMAQI
5th Oct 2025464 AMAQI
5th Oct 2025515 AMAQI
5th Oct 2025426 AMAQI
19°C11/30°C
5th Oct 2025417 AMAQI
5th Oct 2025468 AMAQI
5th Oct 2025399 AMAQI
5th Oct 20254010 AMAQI
5th Oct 20254111 AMAQI
5th Oct 20252812 PMAQI
5th Oct 2025411 PMAQI
5th Oct 2025402 PMAQI
5th Oct 2025563 PMAQI
5th Oct 2025644 PMAQI
5th Oct 2025565 PMAQI
5th Oct 2025486 PMAQI
5th Oct 2025487 PMAQI
5th Oct 2025648 PMAQI
5th Oct 2025729 PMAQI
5th Oct 20258510 PMAQI
5th Oct 20256511 PMAQI
6th Oct 20255612 AMAQI
6th Oct 2025511 AMAQI
6th Oct 2025522 AMAQI
6th Oct 2025533 AMAQI
6th Oct 2025554 AMAQI
6th Oct 2025525 AMAQI
6th Oct 2025566 AMAQI
19°C10/31°C
6th Oct 2025487 AMAQI
6th Oct 2025418 AMAQI
6th Oct 2025359 AMAQI
6th Oct 20252210 AMAQI
7th Oct 2025274 AMAQI
7th Oct 2025265 AMAQI
7th Oct 2025496 AMAQI
22°C12/35°C
7th Oct 2025487 AMAQI
7th Oct 2025508 AMAQI
7th Oct 2025519 AMAQI
7th Oct 20253110 AMAQI
7th Oct 20253111 AMAQI
7th Oct 20254312 PMAQI
7th Oct 2025461 PMAQI
7th Oct 2025512 PMAQI
7th Oct 2025563 PMAQI
7th Oct 2025684 PMAQI
7th Oct 2025655 PMAQI
7th Oct 2025376 PMAQI
7th Oct 2025307 PMAQI
7th Oct 2025628 PMAQI
7th Oct 2025649 PMAQI
7th Oct 20255610 PMAQI
7th Oct 20255111 PMAQI
8th Oct 20254812 AMAQI
8th Oct 2025491 AMAQI
8th Oct 2025532 AMAQI
8th Oct 2025553 AMAQI
8th Oct 2025504 AMAQI
8th Oct 2025445 AMAQI
8th Oct 2025416 AMAQI
23°C13/35°C
8th Oct 2025397 AMAQI
8th Oct 2025408 AMAQI
8th Oct 2025329 AMAQI
8th Oct 20253910 AMAQI
8th Oct 20254611 AMAQI
8th Oct 20255512 PMAQI
8th Oct 2025491 PMAQI
8th Oct 2025502 PMAQI
8th Oct 2025493 PMAQI
8th Oct 2025564 PMAQI
8th Oct 2025545 PMAQI
8th Oct 2025456 PMAQI
8th Oct 2025427 PMAQI
8th Oct 2025448 PMAQI
8th Oct 2025489 PMAQI
8th Oct 20254410 PMAQI
8th Oct 20253811 PMAQI
9th Oct 20254012 AMAQI
9th Oct 2025391 AMAQI
9th Oct 2025402 AMAQI
9th Oct 2025473 AMAQI
9th Oct 2025504 AMAQI
9th Oct 2025485 AMAQI
9th Oct 2025446 AMAQI
16°C12/21°C
9th Oct 2025477 AMAQI
9th Oct 2025358 AMAQI
9th Oct 2025249 AMAQI
9th Oct 20252610 AMAQI
9th Oct 20253011 AMAQI
9th Oct 20255312 PMAQI
9th Oct 2025671 PMAQI
9th Oct 2025632 PMAQI
9th Oct 2025623 PMAQI
9th Oct 2025454 PMAQI
9th Oct 2025485 PMAQI
9th Oct 2025456 PMAQI
9th Oct 2025437 PMAQI
9th Oct 2025388 PMAQI
9th Oct 2025459 PMAQI
9th Oct 20255110 PMAQI
9th Oct 20255511 PMAQI
10th Oct 20255512 AMAQI
10th Oct 2025561 AMAQI
10th Oct 2025222 AMAQI
10th Oct 2025223 AMAQI
10th Oct 2025224 AMAQI
10th Oct 2025355 AMAQI
10th Oct 2025356 AMAQI
17°C14/21°C
10th Oct 2025227 AMAQI
10th Oct 2025278 AMAQI
10th Oct 2025429 AMAQI
10th Oct 20254910 AMAQI
10th Oct 20254911 AMAQI
10th Oct 20253512 PMAQI
10th Oct 2025281 PMAQI
10th Oct 2025422 PMAQI
10th Oct 2025453 PMAQI
10th Oct 2025624 PMAQI
10th Oct 2025565 PMAQI
10th Oct 2025246 PMAQI
10th Oct 2025167 PMAQI
10th Oct 2025258 PMAQI
10th Oct 2025249 PMAQI
10th Oct 20252110 PMAQI
10th Oct 20252211 PMAQI
11th Oct 20253812 AMAQI
11th Oct 2025371 AMAQI
11th Oct 2025352 AMAQI
11th Oct 2025233 AMAQI
11th Oct 2025224 AMAQI
11th Oct 2025295 AMAQI
11th Oct 2025176 AMAQI
15°C9/23°C
11th Oct 2025247 AMAQI
11th Oct 2025268 AMAQI
11th Oct 2025289 AMAQI
11th Oct 20252510 AMAQI
11th Oct 20252711 AMAQI
11th Oct 20252612 PMAQI
11th Oct 2025231 PMAQI
11th Oct 2025232 PMAQI
11th Oct 2025243 PMAQI
11th Oct 2025244 PMAQI
11th Oct 2025245 PMAQI
11th Oct 2025276 PMAQI
11th Oct 2025257 PMAQI
11th Oct 2025348 PMAQI
11th Oct 2025379 PMAQI
11th Oct 20255110 PMAQI
11th Oct 20254411 PMAQI
12th Oct 20254612 AMAQI
12th Oct 2025471 AMAQI
12th Oct 2025512 AMAQI
12th Oct 2025563 AMAQI
12th Oct 2025544 AMAQI
12th Oct 2025415 AMAQI
12th Oct 2025186 AMAQI
16°C9/26°C
12th Oct 2025247 AMAQI
12th Oct 2025348 AMAQI
12th Oct 2025429 AMAQI
12th Oct 20253810 AMAQI
12th Oct 20254211 AMAQI
12th Oct 20252812 PMAQI
12th Oct 2025251 PMAQI
12th Oct 2025232 PMAQI
12th Oct 2025253 PMAQI
12th Oct 2025254 PMAQI
12th Oct 2025255 PMAQI
12th Oct 2025266 PMAQI
12th Oct 2025267 PMAQI
12th Oct 2025348 PMAQI
12th Oct 2025559 PMAQI
12th Oct 20255710 PMAQI
12th Oct 20255611 PMAQI
13th Oct 20255312 AMAQI
13th Oct 2025511 AMAQI
13th Oct 2025442 AMAQI
13th Oct 2025463 AMAQI
13th Oct 2025514 AMAQI
13th Oct 2025535 AMAQI
13th Oct 2025476 AMAQI
17°C8/28°C
13th Oct 2025497 AMAQI
13th Oct 2025468 AMAQI
13th Oct 2025399 AMAQI
13th Oct 20253710 AMAQI
13th Oct 20253711 AMAQI
13th Oct 20253912 PMAQI
13th Oct 2025431 PMAQI
13th Oct 2025322 PMAQI
13th Oct 2025333 PMAQI
13th Oct 2025514 PMAQI
13th Oct 2025535 PMAQI
13th Oct 2025546 PMAQI
13th Oct 2025597 PMAQI
13th Oct 2025488 PMAQI
13th Oct 2025499 PMAQI
13th Oct 20255710 PMAQI
13th Oct 20257211 PMAQI
14th Oct 20253812 AMAQI
14th Oct 2025471 AMAQI
14th Oct 2025512 AMAQI
14th Oct 2025513 AMAQI
14th Oct 2025264 AMAQI
14th Oct 2025265 AMAQI
14th Oct 2025256 AMAQI
12°C10/15°C
14th Oct 2025307 AMAQI
14th Oct 2025288 AMAQI
14th Oct 2025239 AMAQI
14th Oct 20252710 AMAQI
14th Oct 20252911 AMAQI
14th Oct 20253012 PMAQI
14th Oct 2025321 PMAQI
14th Oct 2025282 PMAQI
14th Oct 2025333 PMAQI
14th Oct 2025304 PMAQI
14th Oct 2025295 PMAQI
14th Oct 2025286 PMAQI
14th Oct 2025267 PMAQI
14th Oct 2025278 PMAQI
14th Oct 2025299 PMAQI
14th Oct 20253010 PMAQI
14th Oct 20252511 PMAQI
15th Oct 20252912 AMAQI
15th Oct 2025341 AMAQI
15th Oct 2025462 AMAQI
15th Oct 2025373 AMAQI
15th Oct 2025394 AMAQI
15th Oct 2025465 AMAQI
15th Oct 2025446 AMAQI
12°C9/16°C
15th Oct 2025327 AMAQI
15th Oct 2025248 AMAQI
15th Oct 2025249 AMAQI
15th Oct 20252210 AMAQI
15th Oct 20252311 AMAQI
15th Oct 20253012 PMAQI
15th Oct 2025231 PMAQI
15th Oct 2025252 PMAQI
15th Oct 2025333 PMAQI
15th Oct 2025314 PMAQI
15th Oct 2025285 PMAQI
15th Oct 2025266 PMAQI
15th Oct 2025227 PMAQI
15th Oct 2025268 PMAQI
15th Oct 2025369 PMAQI
15th Oct 20253810 PMAQI
15th Oct 20253711 PMAQI
16th Oct 20254412 AMAQI
16th Oct 2025481 AMAQI
16th Oct 2025502 AMAQI
16th Oct 2025393 AMAQI
16th Oct 2025454 AMAQI
16th Oct 2025485 AMAQI
16th Oct 2025506 AMAQI
15°C12/18°C
16th Oct 2025467 AMAQI
16th Oct 2025328 AMAQI
16th Oct 2025339 AMAQI
16th Oct 20253010 AMAQI
16th Oct 20253711 AMAQI
16th Oct 20254412 PMAQI
16th Oct 2025421 PMAQI
16th Oct 2025492 PMAQI
16th Oct 2025533 PMAQI
16th Oct 2025404 PMAQI
16th Oct 2025495 PMAQI
16th Oct 2025486 PMAQI
16th Oct 2025377 PMAQI
16th Oct 2025458 PMAQI
16th Oct 2025499 PMAQI
16th Oct 20255610 PMAQI
16th Oct 20256211 PMAQI
17th Oct 20254912 AMAQI
17th Oct 2025411 AMAQI
17th Oct 2025422 AMAQI
17th Oct 2025403 AMAQI
17th Oct 2025384 AMAQI
17th Oct 2025415 AMAQI
17th Oct 2025446 AMAQI
15°C8/25°C
17th Oct 2025517 AMAQI
17th Oct 2025458 AMAQI
17th Oct 2025459 AMAQI
17th Oct 20254810 AMAQI
17th Oct 20253911 AMAQI
17th Oct 20253412 PMAQI
17th Oct 2025491 PMAQI
17th Oct 2025432 PMAQI
17th Oct 2025493 PMAQI
17th Oct 2025534 PMAQI
17th Oct 2025525 PMAQI
17th Oct 2025506 PMAQI
17th Oct 2025497 PMAQI
17th Oct 2025468 PMAQI
17th Oct 2025539 PMAQI
17th Oct 20256310 PMAQI
17th Oct 20255211 PMAQI
18th Oct 20254612 AMAQI
18th Oct 2025481 AMAQI
18th Oct 2025552 AMAQI
18th Oct 2025643 AMAQI
18th Oct 2025644 AMAQI
18th Oct 2025635 AMAQI
18th Oct 2025576 AMAQI
16°C8/28°C
18th Oct 2025527 AMAQI
18th Oct 2025438 AMAQI
18th Oct 2025479 AMAQI
18th Oct 20254910 AMAQI
18th Oct 20254711 AMAQI
18th Oct 20254612 PMAQI
18th Oct 2025651 PMAQI
18th Oct 2025592 PMAQI
18th Oct 2025553 PMAQI
18th Oct 2025524 PMAQI
18th Oct 2025545 PMAQI
18th Oct 2025536 PMAQI
18th Oct 2025507 PMAQI
18th Oct 2025548 PMAQI
18th Oct 2025529 PMAQI
18th Oct 20254710 PMAQI
18th Oct 20255411 PMAQI
19th Oct 20255412 AMAQI
19th Oct 2025561 AMAQI
19th Oct 2025562 AMAQI
19th Oct 2025593 AMAQI
19th Oct 2025574 AMAQI
19th Oct 2025595 AMAQI
19th Oct 2025576 AMAQI
19°C10/29°C
19th Oct 2025547 AMAQI
19th Oct 2025468 AMAQI
19th Oct 2025419 AMAQI
19th Oct 20253810 AMAQI
19th Oct 20253011 AMAQI
19th Oct 20256212 PMAQI
19th Oct 2025831 PMAQI
19th Oct 2025622 PMAQI
19th Oct 2025733 PMAQI
19th Oct 2025774 PMAQI
19th Oct 2025725 PMAQI
19th Oct 2025736 PMAQI
19th Oct 2025827 PMAQI
19th Oct 2025698 PMAQI
19th Oct 2025809 PMAQI
19th Oct 20256410 PMAQI
19th Oct 20255411 PMAQI
20th Oct 20253612 AMAQI
20th Oct 2025221 AMAQI
20th Oct 2025222 AMAQI
20th Oct 2025223 AMAQI
20th Oct 2025224 AMAQI
20th Oct 2025225 AMAQI
20th Oct 2025236 AMAQI
17°C9/28°C
20th Oct 2025237 AMAQI
20th Oct 2025238 AMAQI
20th Oct 2025239 AMAQI
20th Oct 20254310 AMAQI
20th Oct 20255911 AMAQI
20th Oct 20254912 PMAQI
20th Oct 2025241 PMAQI
20th Oct 2025252 PMAQI
20th Oct 2025343 PMAQI
20th Oct 2025244 PMAQI
20th Oct 2025255 PMAQI
20th Oct 2025256 PMAQI
20th Oct 2025287 PMAQI
20th Oct 2025398 PMAQI
20th Oct 2025579 PMAQI
20th Oct 20254410 PMAQI
20th Oct 20254311 PMAQI
21st Oct 20255612 AMAQI
21st Oct 2025511 AMAQI
21st Oct 2025402 AMAQI
21st Oct 2025483 AMAQI
21st Oct 2025654 AMAQI
21st Oct 2025655 AMAQI
21st Oct 2025676 AMAQI
19°C10/31°C
21st Oct 2025307 AMAQI
21st Oct 2025278 AMAQI
21st Oct 2025289 AMAQI
21st Oct 20252910 AMAQI
21st Oct 20253411 AMAQI
21st Oct 20253212 PMAQI
21st Oct 2025241 PMAQI
21st Oct 2025202 PMAQI
21st Oct 2025343 PMAQI
21st Oct 2025514 PMAQI
21st Oct 2025365 PMAQI
21st Oct 2025276 PMAQI
21st Oct 2025437 PMAQI
21st Oct 2025478 PMAQI
21st Oct 2025369 PMAQI
21st Oct 20253710 PMAQI
21st Oct 20254011 PMAQI
22nd Oct 20254012 AMAQI
22nd Oct 2025371 AMAQI
22nd Oct 2025342 AMAQI
22nd Oct 2025303 AMAQI
22nd Oct 2025284 AMAQI
22nd Oct 2025285 AMAQI
22nd Oct 2025306 AMAQI
18°C10/30°C
22nd Oct 2025277 AMAQI
22nd Oct 2025248 AMAQI
22nd Oct 2025279 AMAQI
22nd Oct 20252610 AMAQI
22nd Oct 20252611 AMAQI
22nd Oct 20252712 PMAQI
22nd Oct 2025281 PMAQI
22nd Oct 2025282 PMAQI
22nd Oct 2025353 PMAQI
22nd Oct 2025464 PMAQI
22nd Oct 2025455 PMAQI
22nd Oct 2025426 PMAQI
22nd Oct 2025477 PMAQI
22nd Oct 2025528 PMAQI
22nd Oct 2025449 PMAQI
22nd Oct 20253610 PMAQI
22nd Oct 20253311 PMAQI
23rd Oct 20252912 AMAQI
23rd Oct 2025301 AMAQI
23rd Oct 2025302 AMAQI
23rd Oct 2025303 AMAQI
23rd Oct 2025324 AMAQI
23rd Oct 2025265 AMAQI
23rd Oct 2025296 AMAQI
17°C12/24°C
23rd Oct 2025297 AMAQI
23rd Oct 2025298 AMAQI
23rd Oct 2025379 AMAQI
23rd Oct 20252710 AMAQI
23rd Oct 20252111 AMAQI
23rd Oct 20252712 PMAQI
23rd Oct 2025321 PMAQI
23rd Oct 2025302 PMAQI
23rd Oct 2025353 PMAQI
23rd Oct 2025414 PMAQI
23rd Oct 2025365 PMAQI
23rd Oct 2025376 PMAQI
23rd Oct 2025407 PMAQI
23rd Oct 2025428 PMAQI
23rd Oct 2025409 PMAQI
23rd Oct 20253910 PMAQI
23rd Oct 20254011 PMAQI
24th Oct 20253212 AMAQI
24th Oct 2025301 AMAQI
24th Oct 2025332 AMAQI
24th Oct 2025383 AMAQI
24th Oct 2025284 AMAQI
24th Oct 2025255 AMAQI
24th Oct 2025246 AMAQI
15°C8/27°C
24th Oct 2025307 AMAQI
24th Oct 2025348 AMAQI
24th Oct 2025429 AMAQI
24th Oct 20254810 AMAQI
24th Oct 20253311 AMAQI
24th Oct 20253012 PMAQI
24th Oct 2025291 PMAQI
24th Oct 2025342 PMAQI
24th Oct 2025383 PMAQI
24th Oct 2025344 PMAQI
24th Oct 2025325 PMAQI
24th Oct 2025426 PMAQI
24th Oct 2025487 PMAQI
24th Oct 2025408 PMAQI
24th Oct 2025489 PMAQI
24th Oct 20253210 PMAQI
24th Oct 20251711 PMAQI
25th Oct 20251612 AMAQI
25th Oct 2025141 AMAQI
25th Oct 2025132 AMAQI
25th Oct 2025203 AMAQI
25th Oct 2025204 AMAQI
25th Oct 2025185 AMAQI
25th Oct 2025206 AMAQI
13°C7/23°C
25th Oct 2025207 AMAQI
25th Oct 2025158 AMAQI
25th Oct 2025159 AMAQI
25th Oct 20251710 AMAQI
25th Oct 20251811 AMAQI
25th Oct 20253412 PMAQI
25th Oct 2025401 PMAQI
25th Oct 2025272 PMAQI
25th Oct 2025243 PMAQI
25th Oct 2025204 PMAQI
25th Oct 2025225 PMAQI
25th Oct 2025286 PMAQI
25th Oct 2025297 PMAQI
25th Oct 2025298 PMAQI
25th Oct 2025329 PMAQI
25th Oct 20252910 PMAQI
25th Oct 20252811 PMAQI
26th Oct 20253212 AMAQI
26th Oct 2025261 AMAQI
26th Oct 2025272 AMAQI
26th Oct 2025233 AMAQI
26th Oct 2025244 AMAQI
26th Oct 2025255 AMAQI
26th Oct 2025186 AMAQI
15°C11/19°C
26th Oct 2025157 AMAQI
26th Oct 2025198 AMAQI
26th Oct 2025199 AMAQI
26th Oct 20251810 AMAQI
26th Oct 20252111 AMAQI
26th Oct 20252512 PMAQI
26th Oct 2025261 PMAQI
26th Oct 2025232 PMAQI
26th Oct 2025223 PMAQI
26th Oct 2025254 PMAQI
26th Oct 2025225 PMAQI
26th Oct 2025206 PMAQI
26th Oct 2025287 PMAQI
26th Oct 2025388 PMAQI
26th Oct 2025369 PMAQI
26th Oct 20252710 PMAQI
26th Oct 20252411 PMAQI
27th Oct 20252512 AMAQI
27th Oct 2025221 AMAQI
27th Oct 2025172 AMAQI
27th Oct 2025173 AMAQI
27th Oct 2025184 AMAQI
27th Oct 2025185 AMAQI
27th Oct 2025196 AMAQI
14°C11/17°C
27th Oct 2025217 AMAQI
27th Oct 2025218 AMAQI
27th Oct 2025209 AMAQI
27th Oct 20252210 AMAQI
27th Oct 20252811 AMAQI
27th Oct 20252012 PMAQI
27th Oct 2025111 PMAQI
27th Oct 2025112 PMAQI
27th Oct 2025113 PMAQI
27th Oct 2025184 PMAQI
27th Oct 2025235 PMAQI
27th Oct 2025206 PMAQI
27th Oct 2025177 PMAQI
27th Oct 2025178 PMAQI
27th Oct 2025219 PMAQI
27th Oct 20252410 PMAQI
27th Oct 20252611 PMAQI
28th Oct 20252612 AMAQI
28th Oct 2025221 AMAQI
28th Oct 2025202 AMAQI
28th Oct 2025233 AMAQI
28th Oct 2025314 AMAQI
28th Oct 2025375 AMAQI
28th Oct 2025336 AMAQI
15°C8/24°C
28th Oct 2025237 AMAQI
28th Oct 2025298 AMAQI
28th Oct 2025369 AMAQI
28th Oct 20253710 AMAQI
28th Oct 20253211 AMAQI
28th Oct 20252412 PMAQI
28th Oct 2025271 PMAQI
28th Oct 2025272 PMAQI
28th Oct 2025233 PMAQI
28th Oct 2025234 PMAQI
28th Oct 2025255 PMAQI
28th Oct 2025286 PMAQI
28th Oct 2025227 PMAQI
28th Oct 2025188 PMAQI
28th Oct 2025159 PMAQI
28th Oct 20251910 PMAQI
28th Oct 20252611 PMAQI
29th Oct 20253212 AMAQI
29th Oct 2025351 AMAQI
29th Oct 2025372 AMAQI
29th Oct 2025263 AMAQI
29th Oct 2025244 AMAQI
29th Oct 2025285 AMAQI
29th Oct 2025306 AMAQI
17°C8/29°C
29th Oct 2025337 AMAQI
29th Oct 2025368 AMAQI
29th Oct 2025389 AMAQI
29th Oct 20253510 AMAQI
29th Oct 20253811 AMAQI
29th Oct 20253712 PMAQI
29th Oct 2025441 PMAQI
29th Oct 2025442 PMAQI
29th Oct 2025403 PMAQI
29th Oct 2025344 PMAQI
29th Oct 2025265 PMAQI
29th Oct 2025226 PMAQI
29th Oct 2025227 PMAQI
29th Oct 2025258 PMAQI
29th Oct 2025289 PMAQI
29th Oct 20252810 PMAQI
29th Oct 20252811 PMAQI
30th Oct 20252712 AMAQI
30th Oct 2025351 AMAQI
30th Oct 2025432 AMAQI
30th Oct 2025343 AMAQI
30th Oct 2025254 AMAQI
30th Oct 2025245 AMAQI
30th Oct 2025226 AMAQI
20°C12/33°C
30th Oct 2025317 AMAQI
30th Oct 2025448 AMAQI
30th Oct 2025469 AMAQI
30th Oct 20254510 AMAQI
30th Oct 20254311 AMAQI
30th Oct 20253712 PMAQI
30th Oct 2025321 PMAQI
30th Oct 2025382 PMAQI
30th Oct 2025393 PMAQI
30th Oct 2025304 PMAQI
30th Oct 2025285 PMAQI
30th Oct 2025306 PMAQI
30th Oct 2025287 PMAQI
30th Oct 2025408 PMAQI
30th Oct 2025509 PMAQI
30th Oct 20254010 PMAQI
30th Oct 20253211 PMAQI
31st Oct 20253112 AMAQI
31st Oct 2025281 AMAQI
31st Oct 2025272 AMAQI
31st Oct 2025293 AMAQI
31st Oct 2025304 AMAQI
31st Oct 2025335 AMAQI
31st Oct 2025336 AMAQI
15°C11/22°C
31st Oct 2025287 AMAQI
7 AM31st Oct 2025248 AMAQI
31st Oct 2025249 AMAQI
31st Oct 20252310 AMAQI
31st Oct 20252011 AMAQI
31st Oct 20252012 PMAQI
12 PM31st Oct 2025251 PMAQI
31st Oct 2025322 PMAQI
31st Oct 2025303 PMAQI
31st Oct 2025284 PMAQI
6 PM
12 AM
6 AM
--°C/°C
Day time
Avg. Highest Time
3 PM - 6 PM
40AQI
4 hours / Day
120 hours / Month
Avg. Lowest Time
8 AM - 10 AM
32AQI
3 hours / Day
90 hours / Month
In the last 30 days, during the daytime, the highest AQI was between 3 PM to 6 PM (Avg. 40), while the lowest AQI was between 8 AM to 10 AM (Avg. 32).
Night time
Avg. Highest Time
9 PM
45AQI
1 hours / Day
30 hours / Month
Avg. Lowest Time
12 AM - 6 AM
37AQI
7 hours / Day
210 hours / Month
In the last 30 days, during the daytime, the highest AQI was between 9 PM to 9 PM (Avg. 45), while the lowest AQI was between 12 AM to 6 AM (Avg. 37).
2025 Days Vs Air Quality
Guerneville, Windsor, California, United States
2025
97%
294
3%
9
Total number of days with different AQI categories in last 304 days in 2025 (61 days remaining)
Good
294 DaysModerate
9 DaysPoor
0 DaysUnhealthy
0 DaysSevere
0 DaysHazardous
0 DaysUnder WHO’s Safe Air Quality Limits: 97%
Health Risk Level:
Very Low
In 2025, 97% of 304 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
Guerneville, Windsor, California, 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.
-1th undefined 2025
-1th undefined 2025
-1th undefined 2025
1st January 2025
42AQI
42AQI
2nd January 2025
36AQI
36AQI
3rd January 2025
41AQI
41AQI
4th January 2025
26AQI
26AQI
5th January 2025
33AQI
33AQI
6th January 2025
23AQI
23AQI
7th January 2025
23AQI
23AQI
8th January 2025
26AQI
26AQI
9th January 2025
38AQI
38AQI
10th January 2025
40AQI
40AQI
11th January 2025
30AQI
30AQI
12th January 2025
24AQI
24AQI
13th January 2025
29AQI
29AQI
14th January 2025
32AQI
32AQI
15th January 2025
46AQI
46AQI
16th January 2025
47AQI
47AQI
17th January 2025
44AQI
44AQI
18th January 2025
43AQI
43AQI
19th January 2025
50AQI
50AQI
20th January 2025
35AQI
35AQI
21st January 2025
42AQI
42AQI
22nd January 2025
48AQI
48AQI
23rd January 2025
51AQI
51AQI
24th January 2025
49AQI
49AQI
25th January 2025
38AQI
38AQI
26th January 2025
39AQI
39AQI
27th January 2025
41AQI
41AQI
28th January 2025
52AQI
52AQI
29th January 2025
46AQI
46AQI
30th January 2025
51AQI
51AQI
31st January 2025
43AQI
43AQI
1st February 2025
28AQI
28AQI
2nd February 2025
20AQI
20AQI
3rd February 2025
20AQI
20AQI
4th February 2025
21AQI
21AQI
5th February 2025
22AQI
22AQI
6th February 2025
27AQI
27AQI
7th February 2025
22AQI
22AQI
8th February 2025
25AQI
25AQI
9th February 2025
28AQI
28AQI
10th February 2025
34AQI
34AQI
11th February 2025
32AQI
32AQI
12th February 2025
33AQI
33AQI
13th February 2025
27AQI
27AQI
14th February 2025
25AQI
25AQI
15th February 2025
21AQI
21AQI
16th February 2025
26AQI
26AQI
17th February 2025
20AQI
20AQI
18th February 2025
24AQI
24AQI
19th February 2025
22AQI
22AQI
20th February 2025
22AQI
22AQI
21st February 2025
25AQI
25AQI
22nd February 2025
26AQI
26AQI
23rd February 2025
21AQI
21AQI
24th February 2025
19AQI
19AQI
25th February 2025
21AQI
21AQI
26th February 2025
28AQI
28AQI
27th February 2025
31AQI
31AQI
28th February 2025
34AQI
34AQI
1st March 2025
30AQI
30AQI
2nd March 2025
20AQI
20AQI
3rd March 2025
19AQI
19AQI
4th March 2025
20AQI
20AQI
5th March 2025
22AQI
22AQI
6th March 2025
21AQI
21AQI
7th March 2025
25AQI
25AQI
8th March 2025
32AQI
32AQI
9th March 2025
32AQI
32AQI
10th March 2025
27AQI
27AQI
11th March 2025
26AQI
26AQI
12th March 2025
20AQI
20AQI
13th March 2025
19AQI
19AQI
14th March 2025
17AQI
17AQI
15th March 2025
21AQI
21AQI
16th March 2025
18AQI
18AQI
17th March 2025
16AQI
16AQI
18th March 2025
18AQI
18AQI
19th March 2025
19AQI
19AQI
20th March 2025
16AQI
16AQI
21st March 2025
23AQI
23AQI
22nd March 2025
18AQI
18AQI
23rd March 2025
20AQI
20AQI
24th March 2025
20AQI
20AQI
25th March 2025
23AQI
23AQI
26th March 2025
28AQI
28AQI
27th March 2025
20AQI
20AQI
28th March 2025
23AQI
23AQI
29th March 2025
20AQI
20AQI
30th March 2025
22AQI
22AQI
31st March 2025
21AQI
21AQI
1st April 2025
23AQI
23AQI
2nd April 2025
17AQI
17AQI
3rd April 2025
21AQI
21AQI
4th April 2025
21AQI
21AQI
5th April 2025
24AQI
24AQI
6th April 2025
18AQI
18AQI
7th April 2025
14AQI
14AQI
8th April 2025
13AQI
13AQI
9th April 2025
17AQI
17AQI
10th April 2025
17AQI
17AQI
11th April 2025
18AQI
18AQI
12th April 2025
20AQI
20AQI
13th April 2025
22AQI
22AQI
14th April 2025
21AQI
21AQI
15th April 2025
26AQI
26AQI
16th April 2025
25AQI
25AQI
17th April 2025
18AQI
18AQI
18th April 2025
22AQI
22AQI
19th April 2025
25AQI
25AQI
20th April 2025
18AQI
18AQI
21st April 2025
20AQI
20AQI
22nd April 2025
32AQI
32AQI
23rd April 2025
34AQI
34AQI
24th April 2025
28AQI
28AQI
25th April 2025
18AQI
18AQI
26th April 2025
18AQI
18AQI
27th April 2025
15AQI
15AQI
28th April 2025
20AQI
20AQI
29th April 2025
27AQI
27AQI
30th April 2025
28AQI
28AQI
1st May 2025
33AQI
33AQI
2nd May 2025
24AQI
24AQI
3rd May 2025
16AQI
16AQI
4th May 2025
19AQI
19AQI
5th May 2025
23AQI
23AQI
6th May 2025
30AQI
30AQI
7th May 2025
35AQI
35AQI
8th May 2025
22AQI
22AQI
9th May 2025
28AQI
28AQI
10th May 2025
20AQI
20AQI
11th May 2025
17AQI
17AQI
12th May 2025
15AQI
15AQI
13th May 2025
15AQI
15AQI
14th May 2025
20AQI
20AQI
15th May 2025
24AQI
24AQI
16th May 2025
28AQI
28AQI
17th May 2025
23AQI
23AQI
18th May 2025
19AQI
19AQI
19th May 2025
16AQI
16AQI
20th May 2025
15AQI
15AQI
21st May 2025
29AQI
29AQI
22nd May 2025
21AQI
21AQI
23rd May 2025
18AQI
18AQI
24th May 2025
26AQI
26AQI
25th May 2025
18AQI
18AQI
26th May 2025
15AQI
15AQI
27th May 2025
20AQI
20AQI
28th May 2025
21AQI
21AQI
29th May 2025
18AQI
18AQI
30th May 2025
20AQI
20AQI
31st May 2025
33AQI
33AQI
1st June 2025
43AQI
43AQI
2nd June 2025
47AQI
47AQI
3rd June 2025
33AQI
33AQI
4th June 2025
28AQI
28AQI
5th June 2025
21AQI
21AQI
6th June 2025
17AQI
17AQI
7th June 2025
17AQI
17AQI
8th June 2025
16AQI
16AQI
9th June 2025
17AQI
17AQI
10th June 2025
20AQI
20AQI
11th June 2025
26AQI
26AQI
12th June 2025
36AQI
36AQI
13th June 2025
37AQI
37AQI
14th June 2025
35AQI
35AQI
15th June 2025
35AQI
35AQI
16th June 2025
26AQI
26AQI
17th June 2025
24AQI
24AQI
18th June 2025
23AQI
23AQI
19th June 2025
29AQI
29AQI
20th June 2025
29AQI
29AQI
21st June 2025
23AQI
23AQI
22nd June 2025
20AQI
20AQI
23rd June 2025
23AQI
23AQI
24th June 2025
22AQI
22AQI
25th June 2025
20AQI
20AQI
26th June 2025
19AQI
19AQI
27th June 2025
22AQI
22AQI
28th June 2025
24AQI
24AQI
29th June 2025
23AQI
23AQI
30th June 2025
20AQI
20AQI
1st July 2025
20AQI
20AQI
2nd July 2025
18AQI
18AQI
3rd July 2025
24AQI
24AQI
4th July 2025
24AQI
24AQI
5th July 2025
29AQI
29AQI
6th July 2025
27AQI
27AQI
7th July 2025
19AQI
19AQI
8th July 2025
18AQI
18AQI
9th July 2025
17AQI
17AQI
10th July 2025
20AQI
20AQI
11th July 2025
31AQI
31AQI
12th July 2025
30AQI
30AQI
13th July 2025
22AQI
22AQI
14th July 2025
18AQI
18AQI
15th July 2025
18AQI
18AQI
16th July 2025
20AQI
20AQI
17th July 2025
19AQI
19AQI
18th July 2025
16AQI
16AQI
19th July 2025
18AQI
18AQI
20th July 2025
18AQI
18AQI
21st July 2025
22AQI
22AQI
22nd July 2025
17AQI
17AQI
23rd July 2025
18AQI
18AQI
24th July 2025
15AQI
15AQI
25th July 2025
15AQI
15AQI
26th July 2025
15AQI
15AQI
27th July 2025
15AQI
15AQI
28th July 2025
17AQI
17AQI
29th July 2025
21AQI
21AQI
30th July 2025
22AQI
22AQI
31st July 2025
22AQI
22AQI
1st August 2025
22AQI
22AQI
2nd August 2025
20AQI
20AQI
3rd August 2025
28AQI
28AQI
4th August 2025
29AQI
29AQI
5th August 2025
26AQI
26AQI
6th August 2025
31AQI
31AQI
7th August 2025
24AQI
24AQI
8th August 2025
30AQI
30AQI
9th August 2025
30AQI
30AQI
10th August 2025
27AQI
27AQI
11th August 2025
31AQI
31AQI
12th August 2025
27AQI
27AQI
13th August 2025
25AQI
25AQI
14th August 2025
19AQI
19AQI
15th August 2025
30AQI
30AQI
16th August 2025
17AQI
17AQI
17th August 2025
15AQI
15AQI
18th August 2025
17AQI
17AQI
19th August 2025
21AQI
21AQI
20th August 2025
26AQI
26AQI
21st August 2025
37AQI
37AQI
22nd August 2025
42AQI
42AQI
23rd August 2025
31AQI
31AQI
24th August 2025
24AQI
24AQI
25th August 2025
26AQI
26AQI
26th August 2025
30AQI
30AQI
27th August 2025
31AQI
31AQI
28th August 2025
26AQI
26AQI
29th August 2025
25AQI
25AQI
30th August 2025
27AQI
27AQI
31st August 2025
29AQI
29AQI
1st September 2025
24AQI
24AQI
2nd September 2025
32AQI
32AQI
3rd September 2025
28AQI
28AQI
4th September 2025
24AQI
24AQI
5th September 2025
22AQI
22AQI
6th September 2025
22AQI
22AQI
7th September 2025
22AQI
22AQI
8th September 2025
21AQI
21AQI
9th September 2025
17AQI
17AQI
10th September 2025
18AQI
18AQI
11th September 2025
24AQI
24AQI
12th September 2025
25AQI
25AQI
13th September 2025
27AQI
27AQI
14th September 2025
20AQI
20AQI
15th September 2025
20AQI
20AQI
16th September 2025
28AQI
28AQI
17th September 2025
28AQI
28AQI
18th September 2025
30AQI
30AQI
19th September 2025
30AQI
30AQI
20th September 2025
35AQI
35AQI
21st September 2025
28AQI
28AQI
22nd September 2025
24AQI
24AQI
23rd September 2025
29AQI
29AQI
24th September 2025
44AQI
44AQI
25th September 2025
24AQI
24AQI
26th September 2025
36AQI
36AQI
27th September 2025
52AQI
52AQI
28th September 2025
71AQI
71AQI
29th September 2025
49AQI
49AQI
30th September 2025
17AQI
17AQI
1st October 2025
20AQI
20AQI
2nd October 2025
33AQI
33AQI
3rd October 2025
39AQI
39AQI
4th October 2025
61AQI
61AQI
5th October 2025
46AQI
46AQI
6th October 2025
53AQI
53AQI
7th October 2025
47AQI
47AQI
8th October 2025
47AQI
47AQI
9th October 2025
44AQI
44AQI
10th October 2025
34AQI
34AQI
11th October 2025
30AQI
30AQI
12th October 2025
40AQI
40AQI
13th October 2025
49AQI
49AQI
14th October 2025
33AQI
33AQI
15th October 2025
32AQI
32AQI
16th October 2025
45AQI
45AQI
17th October 2025
46AQI
46AQI
18th October 2025
53AQI
53AQI
19th October 2025
60AQI
60AQI
20th October 2025
32AQI
32AQI
21st October 2025
42AQI
42AQI
22nd October 2025
35AQI
35AQI
23rd October 2025
33AQI
33AQI
24th October 2025
35AQI
35AQI
25th October 2025
22AQI
22AQI
26th October 2025
25AQI
25AQI
27th October 2025
20AQI
20AQI
28th October 2025
25AQI
25AQI
29th October 2025
31AQI
31AQI
30th October 2025
35AQI
35AQI
31st October 2025
1st November 2025
2nd November 2025
3rd November 2025
4th November 2025
5th November 2025
6th November 2025
7th November 2025
8th November 2025
9th November 2025
10th November 2025
11th November 2025
12th November 2025
13th November 2025
14th November 2025
15th November 2025
16th November 2025
17th November 2025
18th November 2025
19th November 2025
20th November 2025
21st November 2025
22nd November 2025
23rd November 2025
24th November 2025
25th November 2025
26th November 2025
27th November 2025
28th November 2025
29th November 2025
30th November 2025
1st December 2025
2nd December 2025
3rd December 2025
4th December 2025
5th December 2025
6th December 2025
7th December 2025
8th December 2025
9th December 2025
10th December 2025
11th December 2025
12th December 2025
13th December 2025
14th December 2025
15th December 2025
16th December 2025
17th December 2025
18th December 2025
19th December 2025
20th December 2025
21st December 2025
22nd December 2025
23rd December 2025
24th December 2025
25th December 2025
26th December 2025
27th December 2025
28th December 2025
29th December 2025
30th December 2025
31st December 2025
39AQI
25AQI
22AQI
21AQI
22AQI
26AQI
20AQI
27AQI
29AQI
38AQI
No. of days
Jan.Feb.Mar.Apr.MayJun.Jul.Aug.Sep.Oct.Nov.Dec.Total Days
202527AQI
28
3
28
31
30
31
30
31
31
28
2
26
4
294
9
Highest AQI recorded in
January39AQI
Lowest AQI recorded in
July20AQI
202431AQI
15
1
1
1
12
29
31
31
27
1
28
3
26
4
23
8
224
17
Highest AQI recorded in
April42AQI
Lowest AQI recorded in
March17AQI
202335AQI
2
1
27
4
29
5
Highest AQI recorded in
November52AQI
Lowest AQI recorded in
December33AQI
202078AQI
11
10
1
4
1
1
1
1
11
12
2
4
1
Highest AQI recorded in
October104AQI
Lowest AQI recorded in
November55AQI
Most & Least Polluted Years Over the Last 4 Years
Most Polluted Year Recorded
2020(Avg.)
78AQILeast Polluted Year Recorded
2025(Avg.)
27AQIGuerneville's annual 2025 AQI (27) shows an average percentage change of -33.8% (improved AQI) compared to previous years: 2020 (78), 2023 (35), 2024 (31).
