Half Moon Bay, 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
Half Moon Bay, California, United States
2022
2024
2025
2026
AQI
.
Days
AQI Trends: Highest and Lowest
Highest AQI recorded on
31st Aug 2022
65AQILowest AQI recorded on
17th Aug 2025
14AQISame Day Analysis (16th August):
On this day, AQI across the 4 years varied significantly: 2026 ranks 1st highest AQI at 49 of Good air quality on the same day.
Day & Night AQI Trend: 15th Aug - 16th Aug 2026
Half Moon Bay, California, United States
AQI
Day
Night
.
6 AM15th Aug 2026
8 PM
5 AM16th Aug 2026
Day time
Avg. Highest Time
8PM15th Aug
56AQI
Avg. Lowest Time
7AM15th Aug
20AQI
Night time
Avg. Highest Time
9PM15th Aug
58AQI
Avg. Lowest Time
1AM16th Aug
40AQI
In the last 24 hours,
Half Moon Bay's AQI reached its highest point of 58 at 9 PM during the Night, while the lowest point, 20, was recorded at 7 AM during the Day between 15th Aug and 16th Aug 2026.
Day & Night AQI Trend : Jul - Aug 2026
Half Moon Bay, California, United States
JulAug
18th - 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 - 14th14th - 15th15th - 16th16th
Day
Night
18th Jul 2026426 AMAQI
18th Jul 2026427 AMAQI
18th Jul 2026478 AMAQI
18th Jul 2026549 AMAQI
18th Jul 20265510 AMAQI
18th Jul 20265511 AMAQI
18th Jul 20267812 PMAQI
18th Jul 2026831 PMAQI
18th Jul 2026722 PMAQI
18th Jul 2026603 PMAQI
18th Jul 2026554 PMAQI
18th Jul 2026485 PMAQI
18th Jul 2026466 PMAQI
18th Jul 2026477 PMAQI
18th Jul 2026508 PMAQI
18th Jul 2026529 PMAQI
18th Jul 20264410 PMAQI
18th Jul 20265211 PMAQI
19th Jul 20264412 AMAQI
19th Jul 2026481 AMAQI
19th Jul 2026422 AMAQI
19th Jul 2026403 AMAQI
19th Jul 2026404 AMAQI
19th Jul 2026485 AMAQI
14°C12/17°C
19th Jul 2026386 AMAQI
19th Jul 2026447 AMAQI
19th Jul 2026428 AMAQI
19th Jul 2026409 AMAQI
19th Jul 20264210 AMAQI
19th Jul 20264211 AMAQI
19th Jul 20264212 PMAQI
19th Jul 2026421 PMAQI
19th Jul 2026442 PMAQI
19th Jul 2026343 PMAQI
19th Jul 2026524 PMAQI
19th Jul 2026505 PMAQI
19th Jul 2026406 PMAQI
19th Jul 2026587 PMAQI
19th Jul 2026568 PMAQI
19th Jul 2026509 PMAQI
19th Jul 20264610 PMAQI
19th Jul 20264611 PMAQI
20th Jul 20264612 AMAQI
20th Jul 2026481 AMAQI
20th Jul 2026462 AMAQI
20th Jul 2026423 AMAQI
20th Jul 2026424 AMAQI
20th Jul 2026565 AMAQI
14°C12/17°C
20th Jul 2026556 AMAQI
20th Jul 2026487 AMAQI
20th Jul 2026468 AMAQI
20th Jul 2026429 AMAQI
20th Jul 20264610 AMAQI
20th Jul 20265011 AMAQI
20th Jul 20265812 PMAQI
20th Jul 2026571 PMAQI
20th Jul 2026502 PMAQI
20th Jul 2026443 PMAQI
20th Jul 2026474 PMAQI
20th Jul 2026445 PMAQI
20th Jul 2026766 PMAQI
20th Jul 2026427 PMAQI
20th Jul 2026489 PMAQI
20th Jul 20264610 PMAQI
20th Jul 20261811 PMAQI
21st Jul 20261912 AMAQI
21st Jul 2026461 AMAQI
21st Jul 2026462 AMAQI
21st Jul 2026523 AMAQI
21st Jul 2026184 AMAQI
21st Jul 2026205 AMAQI
16°C14/20°C
21st Jul 2026426 AMAQI
21st Jul 2026447 AMAQI
21st Jul 2026468 AMAQI
21st Jul 2026549 AMAQI
21st Jul 20265510 AMAQI
21st Jul 20264611 AMAQI
21st Jul 20264212 PMAQI
21st Jul 2026441 PMAQI
21st Jul 2026442 PMAQI
21st Jul 2026493 PMAQI
21st Jul 2026534 PMAQI
21st Jul 2026425 PMAQI
21st Jul 2026346 PMAQI
21st Jul 2026427 PMAQI
21st Jul 2026478 PMAQI
21st Jul 2026609 PMAQI
21st Jul 20266910 PMAQI
21st Jul 20266711 PMAQI
22nd Jul 20265112 AMAQI
22nd Jul 2026461 AMAQI
22nd Jul 2026462 AMAQI
22nd Jul 2026503 AMAQI
22nd Jul 2026464 AMAQI
22nd Jul 2026205 AMAQI
20°C14/29°C
22nd Jul 2026426 AMAQI
22nd Jul 2026487 AMAQI
22nd Jul 2026468 AMAQI
22nd Jul 2026469 AMAQI
22nd Jul 20264610 AMAQI
22nd Jul 20265011 AMAQI
22nd Jul 20265212 PMAQI
22nd Jul 2026561 PMAQI
22nd Jul 2026342 PMAQI
22nd Jul 2026513 PMAQI
22nd Jul 2026564 PMAQI
22nd Jul 2026425 PMAQI
22nd Jul 2026366 PMAQI
22nd Jul 2026717 PMAQI
22nd Jul 2026548 PMAQI
22nd Jul 2026529 PMAQI
22nd Jul 20265010 PMAQI
22nd Jul 20261811 PMAQI
23rd Jul 20261812 AMAQI
23rd Jul 2026221 AMAQI
23rd Jul 2026202 AMAQI
23rd Jul 2026423 AMAQI
23rd Jul 2026204 AMAQI
23rd Jul 2026245 AMAQI
17°C15/19°C
23rd Jul 2026226 AMAQI
23rd Jul 2026247 AMAQI
23rd Jul 2026488 AMAQI
23rd Jul 2026569 AMAQI
23rd Jul 20265210 AMAQI
23rd Jul 20262011 AMAQI
23rd Jul 20262012 PMAQI
23rd Jul 2026461 PMAQI
23rd Jul 2026742 PMAQI
23rd Jul 2026563 PMAQI
23rd Jul 2026644 PMAQI
23rd Jul 2026295 PMAQI
23rd Jul 2026526 PMAQI
23rd Jul 2026447 PMAQI
23rd Jul 2026668 PMAQI
23rd Jul 2026559 PMAQI
23rd Jul 20265210 PMAQI
23rd Jul 20265011 PMAQI
24th Jul 20263812 AMAQI
24th Jul 2026521 AMAQI
24th Jul 2026482 AMAQI
24th Jul 2026583 AMAQI
24th Jul 2026544 AMAQI
24th Jul 2026565 AMAQI
15°C14/17°C
24th Jul 2026556 AMAQI
24th Jul 2026487 AMAQI
24th Jul 2026738 AMAQI
24th Jul 2026659 AMAQI
24th Jul 20265510 AMAQI
24th Jul 20265911 AMAQI
24th Jul 20265812 PMAQI
24th Jul 2026401 PMAQI
24th Jul 2026542 PMAQI
24th Jul 2026503 PMAQI
24th Jul 2026524 PMAQI
24th Jul 2026425 PMAQI
24th Jul 2026226 PMAQI
24th Jul 2026517 PMAQI
24th Jul 2026528 PMAQI
24th Jul 2026539 PMAQI
24th Jul 20265010 PMAQI
24th Jul 20264811 PMAQI
25th Jul 20264612 AMAQI
25th Jul 2026511 AMAQI
25th Jul 2026462 AMAQI
25th Jul 2026463 AMAQI
25th Jul 2026464 AMAQI
25th Jul 2026505 AMAQI
16°C13/20°C
25th Jul 2026446 AMAQI
25th Jul 2026197 AMAQI
25th Jul 2026468 AMAQI
25th Jul 2026469 AMAQI
25th Jul 20264810 AMAQI
25th Jul 20264911 AMAQI
25th Jul 20263412 PMAQI
25th Jul 2026441 PMAQI
25th Jul 2026422 PMAQI
25th Jul 2026423 PMAQI
25th Jul 2026404 PMAQI
25th Jul 2026465 PMAQI
25th Jul 2026236 PMAQI
25th Jul 2026467 PMAQI
25th Jul 2026528 PMAQI
25th Jul 2026549 PMAQI
25th Jul 20264610 PMAQI
25th Jul 20264611 PMAQI
26th Jul 20265012 AMAQI
26th Jul 2026461 AMAQI
26th Jul 2026462 AMAQI
26th Jul 2026513 AMAQI
26th Jul 2026404 AMAQI
26th Jul 2026465 AMAQI
16°C13/20°C
26th Jul 2026426 AMAQI
26th Jul 2026507 AMAQI
26th Jul 2026468 AMAQI
26th Jul 2026199 AMAQI
26th Jul 20264210 AMAQI
26th Jul 20264611 AMAQI
26th Jul 20265012 PMAQI
26th Jul 2026341 PMAQI
26th Jul 2026402 PMAQI
26th Jul 2026503 PMAQI
26th Jul 2026504 PMAQI
26th Jul 2026255 PMAQI
26th Jul 2026346 PMAQI
26th Jul 2026607 PMAQI
26th Jul 2026588 PMAQI
26th Jul 2026569 PMAQI
26th Jul 20265410 PMAQI
26th Jul 20265611 PMAQI
27th Jul 20265212 AMAQI
27th Jul 2026461 AMAQI
27th Jul 2026512 AMAQI
27th Jul 2026513 AMAQI
27th Jul 2026364 AMAQI
27th Jul 2026465 AMAQI
15°C13/17°C
27th Jul 2026226 AMAQI
27th Jul 2026447 AMAQI
27th Jul 2026468 AMAQI
27th Jul 2026469 AMAQI
27th Jul 20264610 AMAQI
27th Jul 20266011 AMAQI
27th Jul 20265412 PMAQI
27th Jul 2026571 PMAQI
27th Jul 2026462 PMAQI
27th Jul 2026533 PMAQI
27th Jul 2026544 PMAQI
27th Jul 2026275 PMAQI
27th Jul 2026326 PMAQI
27th Jul 2026447 PMAQI
27th Jul 2026278 PMAQI
27th Jul 2026389 PMAQI
27th Jul 20263410 PMAQI
27th Jul 20263811 PMAQI
28th Jul 20264612 AMAQI
28th Jul 2026461 AMAQI
28th Jul 2026462 AMAQI
28th Jul 2026463 AMAQI
28th Jul 2026344 AMAQI
28th Jul 2026425 AMAQI
15°C14/17°C
28th Jul 2026406 AMAQI
28th Jul 2026517 AMAQI
28th Jul 2026448 AMAQI
28th Jul 2026469 AMAQI
28th Jul 20266310 AMAQI
28th Jul 20266011 AMAQI
28th Jul 20265112 PMAQI
28th Jul 2026421 PMAQI
28th Jul 2026502 PMAQI
28th Jul 2026483 PMAQI
28th Jul 2026424 PMAQI
28th Jul 2026425 PMAQI
28th Jul 2026446 PMAQI
28th Jul 2026467 PMAQI
28th Jul 2026498 PMAQI
28th Jul 2026469 PMAQI
28th Jul 20264610 PMAQI
28th Jul 20265011 PMAQI
29th Jul 20264612 AMAQI
29th Jul 2026461 AMAQI
29th Jul 2026422 AMAQI
29th Jul 2026463 AMAQI
29th Jul 2026424 AMAQI
29th Jul 2026505 AMAQI
15°C14/19°C
29th Jul 2026446 AMAQI
29th Jul 2026487 AMAQI
29th Jul 2026528 AMAQI
29th Jul 2026509 AMAQI
29th Jul 20264010 AMAQI
29th Jul 20263611 AMAQI
29th Jul 20265012 PMAQI
29th Jul 2026521 PMAQI
29th Jul 2026482 PMAQI
29th Jul 2026473 PMAQI
29th Jul 2026384 PMAQI
29th Jul 2026385 PMAQI
29th Jul 2026466 PMAQI
29th Jul 2026507 PMAQI
29th Jul 2026348 PMAQI
29th Jul 2026469 PMAQI
29th Jul 20264210 PMAQI
29th Jul 20264611 PMAQI
30th Jul 20264612 AMAQI
30th Jul 2026441 AMAQI
30th Jul 2026462 AMAQI
30th Jul 2026443 AMAQI
30th Jul 2026464 AMAQI
30th Jul 2026465 AMAQI
15°C14/16°C
30th Jul 2026426 AMAQI
30th Jul 2026387 AMAQI
30th Jul 2026448 AMAQI
30th Jul 2026469 AMAQI
30th Jul 20264610 AMAQI
30th Jul 20264611 AMAQI
30th Jul 20264412 PMAQI
30th Jul 2026401 PMAQI
30th Jul 2026402 PMAQI
30th Jul 2026543 PMAQI
30th Jul 2026534 PMAQI
30th Jul 2026545 PMAQI
30th Jul 2026466 PMAQI
30th Jul 2026407 PMAQI
30th Jul 2026448 PMAQI
30th Jul 2026449 PMAQI
30th Jul 20264410 PMAQI
30th Jul 20265011 PMAQI
31st Jul 20264812 AMAQI
31st Jul 2026461 AMAQI
31st Jul 2026462 AMAQI
31st Jul 2026463 AMAQI
31st Jul 2026444 AMAQI
31st Jul 2026465 AMAQI
15°C14/18°C
31st Jul 2026666 AMAQI
31st Jul 2026327 AMAQI
31st Jul 2026528 AMAQI
31st Jul 2026529 AMAQI
31st Jul 20264210 AMAQI
31st Jul 20264211 AMAQI
31st Jul 20264612 PMAQI
31st Jul 2026521 PMAQI
31st Jul 2026512 PMAQI
31st Jul 2026553 PMAQI
31st Jul 2026534 PMAQI
31st Jul 2026535 PMAQI
31st Jul 2026506 PMAQI
31st Jul 2026497 PMAQI
31st Jul 2026488 PMAQI
31st Jul 2026489 PMAQI
31st Jul 20265010 PMAQI
31st Jul 20265311 PMAQI
1st Aug 20265512 AMAQI
1st Aug 2026531 AMAQI
1st Aug 2026462 AMAQI
1st Aug 2026463 AMAQI
1st Aug 2026444 AMAQI
1st Aug 2026445 AMAQI
15°C13/18°C
1st Aug 2026466 AMAQI
1st Aug 2026497 AMAQI
1st Aug 2026468 AMAQI
1st Aug 2026529 AMAQI
1st Aug 20264610 AMAQI
1st Aug 20264411 AMAQI
1st Aug 20264712 PMAQI
1st Aug 2026521 PMAQI
1st Aug 2026512 PMAQI
1st Aug 2026423 PMAQI
1st Aug 2026464 PMAQI
1st Aug 2026505 PMAQI
1st Aug 2026486 PMAQI
1st Aug 2026447 PMAQI
1st Aug 2026428 PMAQI
1st Aug 2026449 PMAQI
1st Aug 20264610 PMAQI
1st Aug 20264811 PMAQI
2nd Aug 20264412 AMAQI
2nd Aug 2026461 AMAQI
2nd Aug 2026442 AMAQI
2nd Aug 2026403 AMAQI
2nd Aug 2026504 AMAQI
2nd Aug 2026465 AMAQI
16°C13/20°C
2nd Aug 2026446 AMAQI
2nd Aug 2026487 AMAQI
2nd Aug 2026428 AMAQI
2nd Aug 2026489 AMAQI
2nd Aug 20264810 AMAQI
2nd Aug 20265011 AMAQI
2nd Aug 20265212 PMAQI
2nd Aug 2026541 PMAQI
2nd Aug 2026532 PMAQI
2nd Aug 2026543 PMAQI
2nd Aug 2026534 PMAQI
2nd Aug 2026505 PMAQI
2nd Aug 2026526 PMAQI
2nd Aug 2026537 PMAQI
2nd Aug 2026578 PMAQI
2nd Aug 2026579 PMAQI
2nd Aug 20265910 PMAQI
2nd Aug 20265811 PMAQI
3rd Aug 20266012 AMAQI
3rd Aug 2026571 AMAQI
3rd Aug 2026602 AMAQI
3rd Aug 2026653 AMAQI
3rd Aug 2026584 AMAQI
3rd Aug 2026575 AMAQI
17°C12/23°C
3rd Aug 2026556 AMAQI
3rd Aug 2026517 AMAQI
3rd Aug 2026568 AMAQI
3rd Aug 2026579 AMAQI
3rd Aug 20265810 AMAQI
3rd Aug 20265811 AMAQI
3rd Aug 20266212 PMAQI
3rd Aug 2026671 PMAQI
3rd Aug 2026692 PMAQI
3rd Aug 2026683 PMAQI
3rd Aug 2026674 PMAQI
3rd Aug 2026635 PMAQI
3rd Aug 2026626 PMAQI
3rd Aug 2026537 PMAQI
3rd Aug 2026548 PMAQI
3rd Aug 2026559 PMAQI
3rd Aug 20265710 PMAQI
3rd Aug 20265611 PMAQI
4th Aug 20265512 AMAQI
4th Aug 2026561 AMAQI
4th Aug 2026542 AMAQI
4th Aug 2026513 AMAQI
4th Aug 2026444 AMAQI
4th Aug 2026445 AMAQI
15°C12/18°C
4th Aug 2026506 AMAQI
4th Aug 2026517 AMAQI
4th Aug 2026498 AMAQI
4th Aug 2026469 AMAQI
4th Aug 20265110 AMAQI
4th Aug 20264211 AMAQI
4th Aug 20265112 PMAQI
4th Aug 2026531 PMAQI
4th Aug 2026462 PMAQI
4th Aug 2026483 PMAQI
4th Aug 2026504 PMAQI
4th Aug 2026425 PMAQI
4th Aug 2026446 PMAQI
4th Aug 2026497 PMAQI
4th Aug 2026498 PMAQI
4th Aug 2026499 PMAQI
4th Aug 20264410 PMAQI
4th Aug 20264911 PMAQI
5th Aug 20264812 AMAQI
5th Aug 2026511 AMAQI
5th Aug 2026482 AMAQI
5th Aug 2026443 AMAQI
5th Aug 2026424 AMAQI
5th Aug 2026445 AMAQI
15°C13/19°C
5th Aug 2026426 AMAQI
5th Aug 2026427 AMAQI
5th Aug 2026408 AMAQI
5th Aug 2026449 AMAQI
5th Aug 20264410 AMAQI
5th Aug 20264811 AMAQI
5th Aug 20264412 PMAQI
5th Aug 2026461 PMAQI
5th Aug 2026502 PMAQI
5th Aug 2026463 PMAQI
5th Aug 2026444 PMAQI
5th Aug 2026485 PMAQI
5th Aug 2026526 PMAQI
5th Aug 2026447 PMAQI
5th Aug 2026488 PMAQI
5th Aug 2026449 PMAQI
5th Aug 20264410 PMAQI
5th Aug 20264211 PMAQI
6th Aug 20264612 AMAQI
6th Aug 2026491 AMAQI
6th Aug 2026422 AMAQI
6th Aug 2026403 AMAQI
6th Aug 2026404 AMAQI
6th Aug 2026385 AMAQI
15°C13/18°C
6th Aug 2026476 AMAQI
6th Aug 2026427 AMAQI
6th Aug 2026448 AMAQI
6th Aug 2026449 AMAQI
6th Aug 20265010 AMAQI
6th Aug 20264611 AMAQI
6th Aug 20265712 PMAQI
6th Aug 2026561 PMAQI
6th Aug 2026572 PMAQI
6th Aug 2026583 PMAQI
6th Aug 2026544 PMAQI
6th Aug 2026485 PMAQI
6th Aug 2026426 PMAQI
6th Aug 2026507 PMAQI
6th Aug 2026468 PMAQI
6th Aug 2026509 PMAQI
6th Aug 20265010 PMAQI
6th Aug 20265011 PMAQI
7th Aug 20265112 AMAQI
7th Aug 2026491 AMAQI
7th Aug 2026462 AMAQI
7th Aug 2026463 AMAQI
7th Aug 2026384 AMAQI
7th Aug 2026405 AMAQI
15°C14/18°C
7th Aug 2026446 AMAQI
7th Aug 2026407 AMAQI
7th Aug 2026448 AMAQI
7th Aug 2026489 AMAQI
7th Aug 20264610 AMAQI
7th Aug 20264411 AMAQI
7th Aug 20264412 PMAQI
7th Aug 2026521 PMAQI
7th Aug 2026482 PMAQI
7th Aug 2026483 PMAQI
7th Aug 2026574 PMAQI
7th Aug 2026505 PMAQI
7th Aug 2026536 PMAQI
7th Aug 2026517 PMAQI
7th Aug 2026468 PMAQI
7th Aug 2026499 PMAQI
7th Aug 20264410 PMAQI
7th Aug 20264711 PMAQI
8th Aug 20265012 AMAQI
8th Aug 2026461 AMAQI
8th Aug 2026462 AMAQI
8th Aug 2026403 AMAQI
8th Aug 2026464 AMAQI
8th Aug 2026445 AMAQI
14°C13/16°C
8th Aug 2026426 AMAQI
8th Aug 2026467 AMAQI
8th Aug 2026448 AMAQI
8th Aug 2026469 AMAQI
8th Aug 20265410 AMAQI
8th Aug 20265511 AMAQI
8th Aug 20266012 PMAQI
8th Aug 2026541 PMAQI
8th Aug 2026542 PMAQI
8th Aug 2026523 PMAQI
8th Aug 2026544 PMAQI
8th Aug 2026545 PMAQI
8th Aug 2026496 PMAQI
8th Aug 2026507 PMAQI
8th Aug 2026508 PMAQI
8th Aug 2026509 PMAQI
8th Aug 20265210 PMAQI
8th Aug 20264611 PMAQI
9th Aug 20265212 AMAQI
9th Aug 2026511 AMAQI
9th Aug 2026512 AMAQI
9th Aug 2026513 AMAQI
9th Aug 2026464 AMAQI
9th Aug 2026445 AMAQI
15°C14/17°C
9th Aug 2026516 AMAQI
9th Aug 2026507 AMAQI
9th Aug 2026488 AMAQI
9th Aug 2026509 AMAQI
9th Aug 20264210 AMAQI
9th Aug 20264811 AMAQI
9th Aug 20264912 PMAQI
9th Aug 2026521 PMAQI
9th Aug 2026532 PMAQI
9th Aug 2026483 PMAQI
9th Aug 2026524 PMAQI
9th Aug 2026485 PMAQI
9th Aug 2026516 PMAQI
9th Aug 2026517 PMAQI
9th Aug 2026508 PMAQI
9th Aug 2026469 PMAQI
9th Aug 20264410 PMAQI
9th Aug 20264411 PMAQI
10th Aug 20264412 AMAQI
10th Aug 2026461 AMAQI
10th Aug 2026442 AMAQI
10th Aug 2026463 AMAQI
10th Aug 2026444 AMAQI
10th Aug 2026465 AMAQI
15°C14/19°C
10th Aug 2026466 AMAQI
10th Aug 2026447 AMAQI
10th Aug 2026468 AMAQI
10th Aug 2026509 AMAQI
10th Aug 20265210 AMAQI
10th Aug 20265111 AMAQI
10th Aug 20265012 PMAQI
10th Aug 2026481 PMAQI
10th Aug 2026532 PMAQI
10th Aug 2026523 PMAQI
10th Aug 2026514 PMAQI
10th Aug 2026505 PMAQI
10th Aug 2026516 PMAQI
10th Aug 2026517 PMAQI
10th Aug 2026518 PMAQI
10th Aug 2026529 PMAQI
10th Aug 20265110 PMAQI
10th Aug 20265111 PMAQI
11th Aug 20265012 AMAQI
11th Aug 2026511 AMAQI
11th Aug 2026522 AMAQI
11th Aug 2026493 AMAQI
11th Aug 2026494 AMAQI
11th Aug 2026505 AMAQI
15°C13/18°C
11th Aug 2026476 AMAQI
11th Aug 2026447 AMAQI
11th Aug 2026448 AMAQI
11th Aug 2026489 AMAQI
11th Aug 20264210 AMAQI
11th Aug 20264611 AMAQI
11th Aug 20264912 PMAQI
11th Aug 2026511 PMAQI
11th Aug 2026492 PMAQI
11th Aug 2026523 PMAQI
11th Aug 2026554 PMAQI
11th Aug 2026605 PMAQI
11th Aug 2026526 PMAQI
11th Aug 2026487 PMAQI
11th Aug 2026468 PMAQI
11th Aug 2026409 PMAQI
11th Aug 20263210 PMAQI
11th Aug 20263111 PMAQI
12th Aug 20263812 AMAQI
12th Aug 2026421 AMAQI
12th Aug 2026342 AMAQI
12th Aug 2026213 AMAQI
12th Aug 2026484 AMAQI
12th Aug 2026465 AMAQI
15°C14/16°C
12th Aug 2026346 AMAQI
12th Aug 2026497 AMAQI
12th Aug 2026468 AMAQI
12th Aug 2026329 AMAQI
12th Aug 20264610 AMAQI
12th Aug 20264911 AMAQI
12th Aug 20265812 PMAQI
12th Aug 2026601 PMAQI
12th Aug 2026582 PMAQI
12th Aug 2026563 PMAQI
12th Aug 2026554 PMAQI
12th Aug 2026505 PMAQI
12th Aug 2026466 PMAQI
12th Aug 2026467 PMAQI
12th Aug 2026408 PMAQI
12th Aug 2026479 PMAQI
12th Aug 20263610 PMAQI
12th Aug 20265011 PMAQI
13th Aug 20265212 AMAQI
13th Aug 2026541 AMAQI
13th Aug 2026542 AMAQI
13th Aug 2026383 AMAQI
13th Aug 2026504 AMAQI
13th Aug 2026525 AMAQI
16°C14/19°C
13th Aug 2026526 AMAQI
13th Aug 2026527 AMAQI
13th Aug 2026528 AMAQI
13th Aug 2026509 AMAQI
13th Aug 20265410 AMAQI
13th Aug 20265011 AMAQI
13th Aug 20265412 PMAQI
13th Aug 2026561 PMAQI
13th Aug 2026602 PMAQI
13th Aug 2026563 PMAQI
13th Aug 2026564 PMAQI
13th Aug 2026505 PMAQI
13th Aug 2026286 PMAQI
13th Aug 2026557 PMAQI
13th Aug 2026568 PMAQI
13th Aug 2026589 PMAQI
13th Aug 20266310 PMAQI
13th Aug 20266611 PMAQI
14th Aug 20265812 AMAQI
14th Aug 2026511 AMAQI
14th Aug 2026462 AMAQI
14th Aug 2026463 AMAQI
14th Aug 2026544 AMAQI
14th Aug 2026525 AMAQI
15°C14/18°C
14th Aug 2026426 AMAQI
14th Aug 2026277 AMAQI
14th Aug 2026338 AMAQI
14th Aug 2026249 AMAQI
14th Aug 20262710 AMAQI
14th Aug 20263411 AMAQI
14th Aug 20264212 PMAQI
14th Aug 2026461 PMAQI
14th Aug 2026482 PMAQI
14th Aug 2026463 PMAQI
14th Aug 2026424 PMAQI
14th Aug 2026465 PMAQI
14th Aug 2026466 PMAQI
14th Aug 2026567 PMAQI
14th Aug 2026468 PMAQI
14th Aug 2026509 PMAQI
14th Aug 20265010 PMAQI
14th Aug 20264211 PMAQI
15th Aug 20265012 AMAQI
15th Aug 2026491 AMAQI
15th Aug 2026462 AMAQI
15th Aug 2026523 AMAQI
15th Aug 2026424 AMAQI
15th Aug 2026545 AMAQI
16°C15/17°C
15th Aug 2026466 AMAQI
15th Aug 2026207 AMAQI
15th Aug 2026258 AMAQI
15th Aug 2026289 AMAQI
15th Aug 20262610 AMAQI
15th Aug 20262211 AMAQI
15th Aug 20262212 PMAQI
15th Aug 2026261 PMAQI
15th Aug 2026522 PMAQI
15th Aug 2026503 PMAQI
15th Aug 2026524 PMAQI
15th Aug 2026465 PMAQI
15th Aug 2026466 PMAQI
15th Aug 2026547 PMAQI
15th Aug 2026568 PMAQI
15th Aug 2026589 PMAQI
15th Aug 20264410 PMAQI
15th Aug 20264611 PMAQI
16th Aug 20264812 AMAQI
16th Aug 2026401 AMAQI
16th Aug 2026462 AMAQI
16th Aug 2026423 AMAQI
16th Aug 2026464 AMAQI
16th Aug 2026465 AMAQI
16°C14/18°C
16th Aug 2026446 AMAQI
6 AM16th Aug 2026467 AMAQI
16th Aug 2026508 AMAQI
16th Aug 2026509 AMAQI
16th Aug 20264610 AMAQI
16th Aug 20264611 AMAQI
16th Aug 20265012 PMAQI
16th Aug 2026551 PMAQI
1 PM16th Aug 2026532 PMAQI
16th Aug 2026583 PMAQI
16th Aug 2026504 PMAQI
16th Aug 2026545 PMAQI
16th Aug 2026546 PMAQI
16th Aug 2026547 PMAQI
16th Aug 2026548 PMAQI
8 PM16th Aug 2026549 PMAQI
16th Aug 20264610 PMAQI
16th Aug 20264411 PMAQI
1 AM
5 AM
15°C13/18°C
Day time
Avg. Highest Time
1 PM - 4 PM
51AQI
4 hours / Day
120 hours / Month
Avg. Lowest Time
6 AM - 7 AM
44AQI
2 hours / Day
60 hours / Month
In the last 30 days, during the daytime, the highest AQI was between 1 PM to 4 PM (Avg. 51), while the lowest AQI was between 6 AM to 7 AM (Avg. 44).
Night time
Avg. Highest Time
9 PM
50AQI
1 hours / Day
30 hours / Month
Avg. Lowest Time
4 AM
43AQI
1 hours / Day
30 hours / Month
In the last 30 days, during the daytime, the highest AQI was between 9 PM to 9 PM (Avg. 50), while the lowest AQI was between 4 AM to 4 AM (Avg. 43).
2026 Days Vs Air Quality
Half Moon Bay, California, United States
2026
91%
205
9%
20
Total number of days with different AQI categories in last 228 days in 2026 (137 days remaining)
Good
205 DaysModerate
20 DaysPoor
0 DaysUnhealthy
0 DaysSevere
0 DaysHazardous
0 DaysUnder WHO’s Safe Air Quality Limits: 91%
Health Risk Level:
Very Low
In 2026, 91% of 228 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
Half Moon Bay, 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
24AQI (US)
24AQI (US)
2nd January 2026
18AQI (US)
18AQI (US)
3rd January 2026
18AQI (US)
18AQI (US)
4th January 2026
24AQI (US)
24AQI (US)
5th January 2026
21AQI (US)
21AQI (US)
6th January 2026
20AQI (US)
20AQI (US)
7th January 2026
24AQI (US)
24AQI (US)
8th January 2026
20AQI (US)
20AQI (US)
9th January 2026
23AQI (US)
23AQI (US)
10th January 2026
39AQI (US)
39AQI (US)
11th January 2026
43AQI (US)
43AQI (US)
12th January 2026
47AQI (US)
47AQI (US)
13th January 2026
52AQI (US)
52AQI (US)
14th January 2026
55AQI (US)
55AQI (US)
15th January 2026
61AQI (US)
61AQI (US)
16th January 2026
48AQI (US)
48AQI (US)
17th January 2026
53AQI (US)
53AQI (US)
18th January 2026
60AQI (US)
60AQI (US)
19th January 2026
49AQI (US)
49AQI (US)
20th January 2026
47AQI (US)
47AQI (US)
21st January 2026
51AQI (US)
51AQI (US)
22nd January 2026
49AQI (US)
49AQI (US)
23rd January 2026
52AQI (US)
52AQI (US)
24th January 2026
49AQI (US)
49AQI (US)
25th January 2026
46AQI (US)
46AQI (US)
26th January 2026
47AQI (US)
47AQI (US)
27th January 2026
43AQI (US)
43AQI (US)
28th January 2026
50AQI (US)
50AQI (US)
29th January 2026
55AQI (US)
55AQI (US)
30th January 2026
52AQI (US)
52AQI (US)
31st January 2026
42AQI (US)
42AQI (US)
1st February 2026
46AQI (US)
46AQI (US)
2nd February 2026
50AQI (US)
50AQI (US)
3rd February 2026
49AQI (US)
49AQI (US)
4th February 2026
49AQI (US)
49AQI (US)
5th February 2026
47AQI (US)
47AQI (US)
6th February 2026
43AQI (US)
43AQI (US)
7th February 2026
36AQI (US)
36AQI (US)
8th February 2026
47AQI (US)
47AQI (US)
9th February 2026
47AQI (US)
47AQI (US)
10th February 2026
48AQI (US)
48AQI (US)
11th February 2026
46AQI (US)
46AQI (US)
12th February 2026
47AQI (US)
47AQI (US)
13th February 2026
53AQI (US)
53AQI (US)
14th February 2026
53AQI (US)
53AQI (US)
15th February 2026
44AQI (US)
44AQI (US)
16th February 2026
45AQI (US)
45AQI (US)
17th February 2026
53AQI (US)
53AQI (US)
18th February 2026
43AQI (US)
43AQI (US)
19th February 2026
44AQI (US)
44AQI (US)
20th February 2026
42AQI (US)
42AQI (US)
21st February 2026
35AQI (US)
35AQI (US)
22nd February 2026
35AQI (US)
35AQI (US)
23rd February 2026
40AQI (US)
40AQI (US)
24th February 2026
45AQI (US)
45AQI (US)
25th February 2026
42AQI (US)
42AQI (US)
26th February 2026
35AQI (US)
35AQI (US)
27th February 2026
32AQI (US)
32AQI (US)
28th February 2026
35AQI (US)
35AQI (US)
1st March 2026
39AQI (US)
39AQI (US)
2nd March 2026
52AQI (US)
52AQI (US)
3rd March 2026
45AQI (US)
45AQI (US)
4th March 2026
45AQI (US)
45AQI (US)
5th March 2026
39AQI (US)
39AQI (US)
6th March 2026
37AQI (US)
37AQI (US)
7th March 2026
37AQI (US)
37AQI (US)
8th March 2026
36AQI (US)
36AQI (US)
9th March 2026
37AQI (US)
37AQI (US)
10th March 2026
34AQI (US)
34AQI (US)
11th March 2026
38AQI (US)
38AQI (US)
12th March 2026
39AQI (US)
39AQI (US)
13th March 2026
37AQI (US)
37AQI (US)
14th March 2026
33AQI (US)
33AQI (US)
15th March 2026
34AQI (US)
34AQI (US)
16th March 2026
36AQI (US)
36AQI (US)
17th March 2026
34AQI (US)
34AQI (US)
18th March 2026
33AQI (US)
33AQI (US)
19th March 2026
33AQI (US)
33AQI (US)
20th March 2026
37AQI (US)
37AQI (US)
21st March 2026
33AQI (US)
33AQI (US)
22nd March 2026
34AQI (US)
34AQI (US)
23rd March 2026
38AQI (US)
38AQI (US)
24th March 2026
38AQI (US)
38AQI (US)
25th March 2026
33AQI (US)
33AQI (US)
26th March 2026
34AQI (US)
34AQI (US)
27th March 2026
33AQI (US)
33AQI (US)
28th March 2026
34AQI (US)
34AQI (US)
29th March 2026
29AQI (US)
29AQI (US)
30th March 2026
27AQI (US)
27AQI (US)
31st March 2026
27AQI (US)
27AQI (US)
1st April 2026
34AQI (US)
34AQI (US)
2nd April 2026
34AQI (US)
34AQI (US)
3rd April 2026
27AQI (US)
27AQI (US)
4th April 2026
30AQI (US)
30AQI (US)
5th April 2026
27AQI (US)
27AQI (US)
6th April 2026
30AQI (US)
30AQI (US)
7th April 2026
29AQI (US)
29AQI (US)
8th April 2026
37AQI (US)
37AQI (US)
9th April 2026
29AQI (US)
29AQI (US)
10th April 2026
34AQI (US)
34AQI (US)
11th April 2026
36AQI (US)
36AQI (US)
12th April 2026
31AQI (US)
31AQI (US)
13th April 2026
35AQI (US)
35AQI (US)
14th April 2026
37AQI (US)
37AQI (US)
15th April 2026
33AQI (US)
33AQI (US)
16th April 2026
33AQI (US)
33AQI (US)
17th April 2026
18th April 2026
34AQI (US)
34AQI (US)
19th April 2026
33AQI (US)
33AQI (US)
20th April 2026
30AQI (US)
30AQI (US)
21st April 2026
28AQI (US)
28AQI (US)
22nd April 2026
23rd April 2026
28AQI (US)
28AQI (US)
24th April 2026
30AQI (US)
30AQI (US)
25th April 2026
31AQI (US)
31AQI (US)
26th April 2026
33AQI (US)
33AQI (US)
27th April 2026
29AQI (US)
29AQI (US)
28th April 2026
26AQI (US)
26AQI (US)
29th April 2026
26AQI (US)
26AQI (US)
30th April 2026
27AQI (US)
27AQI (US)
1st May 2026
28AQI (US)
28AQI (US)
2nd May 2026
24AQI (US)
24AQI (US)
3rd May 2026
21AQI (US)
21AQI (US)
4th May 2026
30AQI (US)
30AQI (US)
5th May 2026
35AQI (US)
35AQI (US)
6th May 2026
34AQI (US)
34AQI (US)
7th May 2026
30AQI (US)
30AQI (US)
8th May 2026
30AQI (US)
30AQI (US)
9th May 2026
10th May 2026
34AQI (US)
34AQI (US)
11th May 2026
36AQI (US)
36AQI (US)
12th May 2026
34AQI (US)
34AQI (US)
13th May 2026
31AQI (US)
31AQI (US)
14th May 2026
29AQI (US)
29AQI (US)
15th May 2026
45AQI (US)
45AQI (US)
16th May 2026
50AQI (US)
50AQI (US)
17th May 2026
57AQI (US)
57AQI (US)
18th May 2026
57AQI (US)
57AQI (US)
19th May 2026
56AQI (US)
56AQI (US)
20th May 2026
49AQI (US)
49AQI (US)
21st May 2026
41AQI (US)
41AQI (US)
22nd May 2026
48AQI (US)
48AQI (US)
23rd May 2026
49AQI (US)
49AQI (US)
24th May 2026
46AQI (US)
46AQI (US)
25th May 2026
43AQI (US)
43AQI (US)
26th May 2026
28AQI (US)
28AQI (US)
27th May 2026
28AQI (US)
28AQI (US)
28th May 2026
28AQI (US)
28AQI (US)
29th May 2026
26AQI (US)
26AQI (US)
30th May 2026
28AQI (US)
28AQI (US)
31st May 2026
29AQI (US)
29AQI (US)
1st June 2026
31AQI (US)
31AQI (US)
2nd June 2026
31AQI (US)
31AQI (US)
3rd June 2026
29AQI (US)
29AQI (US)
4th June 2026
25AQI (US)
25AQI (US)
5th June 2026
27AQI (US)
27AQI (US)
6th June 2026
25AQI (US)
25AQI (US)
7th June 2026
24AQI (US)
24AQI (US)
8th June 2026
26AQI (US)
26AQI (US)
9th June 2026
26AQI (US)
26AQI (US)
10th June 2026
27AQI (US)
27AQI (US)
11th June 2026
28AQI (US)
28AQI (US)
12th June 2026
27AQI (US)
27AQI (US)
13th June 2026
25AQI (US)
25AQI (US)
14th June 2026
23AQI (US)
23AQI (US)
15th June 2026
26AQI (US)
26AQI (US)
16th June 2026
28AQI (US)
28AQI (US)
17th June 2026
28AQI (US)
28AQI (US)
18th June 2026
27AQI (US)
27AQI (US)
19th June 2026
25AQI (US)
25AQI (US)
20th June 2026
23AQI (US)
23AQI (US)
21st June 2026
22AQI (US)
22AQI (US)
22nd June 2026
25AQI (US)
25AQI (US)
23rd June 2026
25AQI (US)
25AQI (US)
24th June 2026
24AQI (US)
24AQI (US)
25th June 2026
25AQI (US)
25AQI (US)
26th June 2026
27AQI (US)
27AQI (US)
27th June 2026
30AQI (US)
30AQI (US)
28th June 2026
26AQI (US)
26AQI (US)
29th June 2026
25AQI (US)
25AQI (US)
30th June 2026
26AQI (US)
26AQI (US)
1st July 2026
26AQI (US)
26AQI (US)
2nd July 2026
27AQI (US)
27AQI (US)
3rd July 2026
28AQI (US)
28AQI (US)
4th July 2026
24AQI (US)
24AQI (US)
5th July 2026
25AQI (US)
25AQI (US)
6th July 2026
28AQI (US)
28AQI (US)
7th July 2026
29AQI (US)
29AQI (US)
8th July 2026
26AQI (US)
26AQI (US)
9th July 2026
28AQI (US)
28AQI (US)
10th July 2026
33AQI (US)
33AQI (US)
11th July 2026
30AQI (US)
30AQI (US)
12th July 2026
28AQI (US)
28AQI (US)
13th July 2026
30AQI (US)
30AQI (US)
14th July 2026
30AQI (US)
30AQI (US)
15th July 2026
28AQI (US)
28AQI (US)
16th July 2026
28AQI (US)
28AQI (US)
17th July 2026
43AQI (US)
43AQI (US)
18th July 2026
53AQI (US)
53AQI (US)
19th July 2026
45AQI (US)
45AQI (US)
20th July 2026
48AQI (US)
48AQI (US)
21st July 2026
45AQI (US)
45AQI (US)
22nd July 2026
46AQI (US)
46AQI (US)
23rd July 2026
41AQI (US)
41AQI (US)
24th July 2026
51AQI (US)
51AQI (US)
25th July 2026
44AQI (US)
44AQI (US)
26th July 2026
45AQI (US)
45AQI (US)
27th July 2026
44AQI (US)
44AQI (US)
28th July 2026
47AQI (US)
47AQI (US)
29th July 2026
45AQI (US)
45AQI (US)
30th July 2026
45AQI (US)
45AQI (US)
31st July 2026
49AQI (US)
49AQI (US)
1st August 2026
47AQI (US)
47AQI (US)
2nd August 2026
50AQI (US)
50AQI (US)
3rd August 2026
59AQI (US)
59AQI (US)
4th August 2026
49AQI (US)
49AQI (US)
5th August 2026
45AQI (US)
45AQI (US)
6th August 2026
48AQI (US)
48AQI (US)
7th August 2026
47AQI (US)
47AQI (US)
8th August 2026
49AQI (US)
49AQI (US)
9th August 2026
49AQI (US)
49AQI (US)
10th August 2026
49AQI (US)
49AQI (US)
11th August 2026
47AQI (US)
47AQI (US)
12th August 2026
45AQI (US)
45AQI (US)
13th August 2026
53AQI (US)
53AQI (US)
14th August 2026
44AQI (US)
44AQI (US)
15th August 2026
42AQI (US)
42AQI (US)
16th August 2026
49AQI (US)
49AQI (US)
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
41AQI (US)
44AQI (US)
36AQI (US)
31AQI (US)
37AQI (US)
26AQI (US)
37AQI (US)
48AQI (US)
No. of days
Jan.Feb.Mar.Apr.MayJun.Jul.Aug.Sep.Oct.Nov.Dec.Total Days
202637AQI (US)
22
9
25
3
30
1
28
27
3
30
29
2
14
2
205
20
Highest AQI (US) recorded in
August48AQI (US)
Lowest AQI (US) recorded in
June26AQI (US)
202534AQI (US)
28
3
28
30
1
30
31
30
31
31
29
1
17
14
19
11
15
16
319
46
Highest AQI (US) recorded in
December49AQI (US)
Lowest AQI (US) recorded in
July21AQI (US)
202433AQI (US)
16
1
12
26
3
30
1
31
28
28
3
28
2
24
7
224
16
Highest AQI (US) recorded in
December43AQI (US)
Lowest AQI (US) recorded in
March13AQI (US)
202336AQI (US)
2
1
24
7
26
8
Highest AQI (US) recorded in
November48AQI (US)
Lowest AQI (US) recorded in
December35AQI (US)
202231AQI (US)
7
1
1
20
2
1
27
4
1
Highest AQI (US) recorded in
August65AQI (US)
Lowest AQI (US) recorded in
September30AQI (US)
202165AQI (US)
11
3
6
3
12
4
1
11
12
6
1
23
4
54
19
18
5
1
Highest AQI (US) recorded in
August113AQI (US)
Lowest AQI (US) recorded in
May26AQI (US)
202064AQI (US)
19
6
4
1
1
1
1
20
7
1
4
1
Highest AQI (US) recorded in
October104AQI (US)
Lowest AQI (US) recorded in
November48AQI (US)
Most & Least Polluted Years Over the Last 7 Years
Most Polluted Year Recorded
2021(Avg.)
65AQI (US)Least Polluted Year Recorded
2022(Avg.)
31AQI (US)Half Moon Bay's annual 2026 AQI (US) (37) shows an average percentage change of -7.03% (improved AQI (US)) compared to previous years: 2020 (64), 2021 (65), 2022 (31), 2023 (36), 2024 (33), 2025 (34).
