San Ysidro, San Diego, 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
San Ysidro, San Diego, California, United States
2025
AQI
.
Days
AQI Trends: Highest and Lowest
Highest AQI recorded on
25th Oct 2025
66AQILowest AQI recorded on
15th Oct 2025
23AQISame Day Analysis (25th October ):
On this day, AQI across the 1 years varied significantly: 2025 ranks 1st highest AQI at 66 of Moderate air quality on the same day.
Download 2024 Annual Data
World Air Quality Report
Day & Night AQI Trend: 25th Oct - 26th Oct 2025
San Ysidro, San Diego, California, United States
AQI
Day
Night
.
6 AM25th Oct 2025
6 PM
5 AM26th Oct 2025
Day time
Avg. Highest Time
7AM25th Oct
87AQI
Avg. Lowest Time
6PM25th Oct
54AQI
Night time
Avg. Highest Time
6AM25th Oct
86AQI
Avg. Lowest Time
9PM25th Oct
50AQI
In the last 24 hours,
San Ysidro's AQI reached its highest point of 87 at 7 AM during the Day, while the lowest point, 50, was recorded at 9 PM during the Night between 25th Oct and 26th Oct 2025.
Day & Night AQI Trend : Sep - Oct 2025
San Ysidro, San Diego, California, United States
SepOct
26th - 27th27th - 28th28th - 29th29th - 30th30th - 01st01st - 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
Day
Night
26th Sep 2025266 AMAQI
26th Sep 2025247 AMAQI
26th Sep 2025278 AMAQI
26th Sep 2025299 AMAQI
26th Sep 20253110 AMAQI
26th Sep 20253111 AMAQI
26th Sep 20253312 PMAQI
26th Sep 2025371 PMAQI
26th Sep 2025462 PMAQI
26th Sep 2025533 PMAQI
26th Sep 2025454 PMAQI
26th Sep 2025305 PMAQI
26th Sep 2025316 PMAQI
26th Sep 2025307 PMAQI
26th Sep 2025298 PMAQI
26th Sep 2025279 PMAQI
26th Sep 20252510 PMAQI
26th Sep 20252211 PMAQI
27th Sep 20251112 AMAQI
27th Sep 2025111 AMAQI
27th Sep 2025112 AMAQI
27th Sep 2025113 AMAQI
27th Sep 2025134 AMAQI
27th Sep 2025175 AMAQI
--°C/°C
27th Sep 2025236 AMAQI
27th Sep 2025357 AMAQI
27th Sep 2025418 AMAQI
27th Sep 2025459 AMAQI
27th Sep 20254410 AMAQI
27th Sep 20253711 AMAQI
27th Sep 20253512 PMAQI
27th Sep 2025371 PMAQI
27th Sep 2025352 PMAQI
27th Sep 2025313 PMAQI
27th Sep 2025184 PMAQI
27th Sep 2025175 PMAQI
27th Sep 2025176 PMAQI
27th Sep 2025177 PMAQI
27th Sep 2025178 PMAQI
27th Sep 2025189 PMAQI
27th Sep 20252010 PMAQI
27th Sep 20252511 PMAQI
28th Sep 20253312 AMAQI
28th Sep 2025331 AMAQI
28th Sep 2025332 AMAQI
28th Sep 2025343 AMAQI
28th Sep 2025374 AMAQI
28th Sep 2025345 AMAQI
20°C18/25°C
28th Sep 2025336 AMAQI
28th Sep 2025357 AMAQI
28th Sep 2025398 AMAQI
28th Sep 2025409 AMAQI
28th Sep 20254910 AMAQI
28th Sep 20255211 AMAQI
28th Sep 20254712 PMAQI
28th Sep 2025491 PMAQI
28th Sep 2025472 PMAQI
28th Sep 2025443 PMAQI
28th Sep 2025424 PMAQI
28th Sep 2025435 PMAQI
28th Sep 2025486 PMAQI
28th Sep 2025447 PMAQI
28th Sep 2025428 PMAQI
28th Sep 2025419 PMAQI
28th Sep 20254110 PMAQI
28th Sep 20254911 PMAQI
29th Sep 20255112 AMAQI
29th Sep 2025581 AMAQI
29th Sep 2025582 AMAQI
29th Sep 2025563 AMAQI
29th Sep 2025494 AMAQI
29th Sep 2025545 AMAQI
21°C17/28°C
29th Sep 2025496 AMAQI
29th Sep 2025457 AMAQI
29th Sep 2025528 AMAQI
29th Sep 2025599 AMAQI
29th Sep 20256410 AMAQI
29th Sep 20256411 AMAQI
29th Sep 20256212 PMAQI
29th Sep 2025461 PMAQI
29th Sep 2025482 PMAQI
29th Sep 2025473 PMAQI
29th Sep 2025534 PMAQI
29th Sep 2025475 PMAQI
29th Sep 2025426 PMAQI
29th Sep 2025407 PMAQI
29th Sep 2025348 PMAQI
29th Sep 2025349 PMAQI
29th Sep 20253610 PMAQI
29th Sep 20253811 PMAQI
30th Sep 20254312 AMAQI
30th Sep 2025391 AMAQI
30th Sep 2025462 AMAQI
30th Sep 2025383 AMAQI
30th Sep 2025364 AMAQI
30th Sep 2025425 AMAQI
20°C16/25°C
30th Sep 2025386 AMAQI
30th Sep 2025427 AMAQI
30th Sep 2025348 AMAQI
30th Sep 2025309 AMAQI
30th Sep 20253510 AMAQI
30th Sep 20252911 AMAQI
30th Sep 20254212 PMAQI
30th Sep 2025471 PMAQI
30th Sep 2025432 PMAQI
30th Sep 2025413 PMAQI
30th Sep 2025444 PMAQI
30th Sep 2025475 PMAQI
30th Sep 2025506 PMAQI
30th Sep 2025457 PMAQI
30th Sep 2025518 PMAQI
30th Sep 2025419 PMAQI
30th Sep 20254910 PMAQI
30th Sep 20255411 PMAQI
1st Oct 20255312 AMAQI
1st Oct 2025541 AMAQI
1st Oct 2025552 AMAQI
1st Oct 2025563 AMAQI
1st Oct 2025584 AMAQI
1st Oct 2025605 AMAQI
20°C18/25°C
1st Oct 2025606 AMAQI
1st Oct 2025607 AMAQI
1st Oct 2025658 AMAQI
1st Oct 2025719 AMAQI
1st Oct 20257110 AMAQI
1st Oct 20257411 AMAQI
1st Oct 20256712 PMAQI
1st Oct 2025591 PMAQI
1st Oct 2025552 PMAQI
1st Oct 2025503 PMAQI
1st Oct 2025404 PMAQI
1st Oct 2025415 PMAQI
1st Oct 2025446 PMAQI
1st Oct 2025407 PMAQI
1st Oct 2025148 PMAQI
1st Oct 2025149 PMAQI
1st Oct 20251210 PMAQI
1st Oct 20251211 PMAQI
2nd Oct 20251312 AMAQI
2nd Oct 2025201 AMAQI
2nd Oct 2025212 AMAQI
2nd Oct 2025243 AMAQI
2nd Oct 2025264 AMAQI
2nd Oct 2025355 AMAQI
20°C15/26°C
2nd Oct 2025586 AMAQI
2nd Oct 2025617 AMAQI
2nd Oct 2025678 AMAQI
2nd Oct 2025599 AMAQI
2nd Oct 20256510 AMAQI
2nd Oct 20257611 AMAQI
2nd Oct 20256612 PMAQI
2nd Oct 2025681 PMAQI
2nd Oct 2025592 PMAQI
2nd Oct 2025353 PMAQI
2nd Oct 2025344 PMAQI
2nd Oct 2025355 PMAQI
2nd Oct 2025356 PMAQI
2nd Oct 2025367 PMAQI
2nd Oct 2025208 PMAQI
2nd Oct 2025149 PMAQI
2nd Oct 20251210 PMAQI
2nd Oct 20251111 PMAQI
3rd Oct 20251212 AMAQI
3rd Oct 2025111 AMAQI
3rd Oct 2025102 AMAQI
3rd Oct 2025113 AMAQI
3rd Oct 2025114 AMAQI
3rd Oct 2025155 AMAQI
20°C15/26°C
3rd Oct 2025246 AMAQI
3rd Oct 2025407 AMAQI
3rd Oct 2025488 AMAQI
3rd Oct 2025599 AMAQI
3rd Oct 20256810 AMAQI
3rd Oct 20256411 AMAQI
3rd Oct 20257012 PMAQI
3rd Oct 2025541 PMAQI
3rd Oct 2025512 PMAQI
3rd Oct 2025263 PMAQI
3rd Oct 2025344 PMAQI
3rd Oct 2025405 PMAQI
3rd Oct 2025446 PMAQI
3rd Oct 2025477 PMAQI
3rd Oct 2025428 PMAQI
3rd Oct 2025419 PMAQI
3rd Oct 20254810 PMAQI
3rd Oct 20254411 PMAQI
4th Oct 20254212 AMAQI
4th Oct 2025481 AMAQI
4th Oct 2025472 AMAQI
4th Oct 2025483 AMAQI
4th Oct 2025494 AMAQI
4th Oct 2025515 AMAQI
20°C16/25°C
4th Oct 2025566 AMAQI
4th Oct 2025557 AMAQI
4th Oct 2025638 AMAQI
4th Oct 2025679 AMAQI
4th Oct 20257010 AMAQI
4th Oct 20256311 AMAQI
4th Oct 20255612 PMAQI
4th Oct 2025541 PMAQI
4th Oct 2025542 PMAQI
4th Oct 2025513 PMAQI
4th Oct 2025494 PMAQI
4th Oct 2025525 PMAQI
4th Oct 2025506 PMAQI
4th Oct 2025487 PMAQI
4th Oct 2025508 PMAQI
4th Oct 2025489 PMAQI
4th Oct 20254810 PMAQI
4th Oct 20255211 PMAQI
5th Oct 20255312 AMAQI
5th Oct 2025561 AMAQI
5th Oct 2025552 AMAQI
5th Oct 2025673 AMAQI
5th Oct 2025684 AMAQI
5th Oct 2025615 AMAQI
19°C14/26°C
5th Oct 2025646 AMAQI
5th Oct 2025627 AMAQI
5th Oct 2025628 AMAQI
5th Oct 2025649 AMAQI
5th Oct 20257310 AMAQI
5th Oct 20257111 AMAQI
5th Oct 20256712 PMAQI
5th Oct 2025721 PMAQI
5th Oct 2025642 PMAQI
5th Oct 2025573 PMAQI
5th Oct 2025544 PMAQI
5th Oct 2025565 PMAQI
5th Oct 2025546 PMAQI
5th Oct 2025537 PMAQI
5th Oct 2025508 PMAQI
5th Oct 2025489 PMAQI
5th Oct 20254710 PMAQI
5th Oct 20255111 PMAQI
6th Oct 20254512 AMAQI
6th Oct 2025491 AMAQI
6th Oct 2025532 AMAQI
6th Oct 2025533 AMAQI
6th Oct 2025514 AMAQI
6th Oct 2025535 AMAQI
18°C14/23°C
6th Oct 2025586 AMAQI
6th Oct 2025577 AMAQI
6th Oct 2025588 AMAQI
6th Oct 2025599 AMAQI
6th Oct 20255610 AMAQI
7th Oct 2025444 AMAQI
7th Oct 2025585 AMAQI
18°C16/21°C
7th Oct 2025656 AMAQI
7th Oct 2025647 AMAQI
7th Oct 2025678 AMAQI
7th Oct 2025739 AMAQI
7th Oct 20256610 AMAQI
7th Oct 20256611 AMAQI
7th Oct 20256412 PMAQI
7th Oct 2025561 PMAQI
7th Oct 2025582 PMAQI
7th Oct 2025623 PMAQI
7th Oct 2025654 PMAQI
7th Oct 2025635 PMAQI
7th Oct 2025626 PMAQI
7th Oct 2025607 PMAQI
7th Oct 2025558 PMAQI
7th Oct 2025539 PMAQI
7th Oct 20254610 PMAQI
7th Oct 20254811 PMAQI
8th Oct 20255212 AMAQI
8th Oct 2025541 AMAQI
8th Oct 2025552 AMAQI
8th Oct 2025563 AMAQI
8th Oct 2025564 AMAQI
8th Oct 2025575 AMAQI
18°C14/22°C
8th Oct 2025576 AMAQI
8th Oct 2025597 AMAQI
8th Oct 2025578 AMAQI
8th Oct 2025559 AMAQI
8th Oct 20256010 AMAQI
8th Oct 20255911 AMAQI
8th Oct 20255312 PMAQI
8th Oct 2025551 PMAQI
8th Oct 2025582 PMAQI
8th Oct 2025593 PMAQI
8th Oct 2025624 PMAQI
8th Oct 2025645 PMAQI
8th Oct 2025596 PMAQI
8th Oct 2025577 PMAQI
8th Oct 2025568 PMAQI
8th Oct 2025519 PMAQI
8th Oct 20254810 PMAQI
8th Oct 20254511 PMAQI
9th Oct 20254312 AMAQI
9th Oct 2025471 AMAQI
9th Oct 2025502 AMAQI
9th Oct 2025563 AMAQI
9th Oct 2025574 AMAQI
9th Oct 2025585 AMAQI
19°C15/23°C
9th Oct 2025566 AMAQI
9th Oct 2025557 AMAQI
9th Oct 2025538 AMAQI
9th Oct 2025579 AMAQI
9th Oct 20256810 AMAQI
9th Oct 20257011 AMAQI
9th Oct 20255812 PMAQI
9th Oct 2025531 PMAQI
9th Oct 2025542 PMAQI
9th Oct 2025533 PMAQI
9th Oct 2025514 PMAQI
9th Oct 2025485 PMAQI
9th Oct 2025456 PMAQI
9th Oct 2025447 PMAQI
9th Oct 2025448 PMAQI
9th Oct 2025449 PMAQI
9th Oct 20254510 PMAQI
9th Oct 20254211 PMAQI
10th Oct 20253612 AMAQI
10th Oct 2025401 AMAQI
10th Oct 2025422 AMAQI
10th Oct 2025443 AMAQI
10th Oct 2025414 AMAQI
10th Oct 2025345 AMAQI
19°C16/26°C
10th Oct 2025406 AMAQI
10th Oct 2025417 AMAQI
10th Oct 2025458 AMAQI
10th Oct 2025469 AMAQI
10th Oct 20255610 AMAQI
10th Oct 20257111 AMAQI
10th Oct 20256312 PMAQI
10th Oct 2025581 PMAQI
10th Oct 2025542 PMAQI
10th Oct 2025563 PMAQI
10th Oct 2025564 PMAQI
10th Oct 2025565 PMAQI
10th Oct 2025566 PMAQI
10th Oct 2025557 PMAQI
10th Oct 2025538 PMAQI
10th Oct 2025509 PMAQI
10th Oct 20254710 PMAQI
10th Oct 20255211 PMAQI
11th Oct 20254912 AMAQI
11th Oct 2025511 AMAQI
11th Oct 2025542 AMAQI
11th Oct 2025543 AMAQI
11th Oct 2025534 AMAQI
11th Oct 2025555 AMAQI
21°C17/30°C
11th Oct 2025536 AMAQI
11th Oct 2025537 AMAQI
11th Oct 2025528 AMAQI
11th Oct 2025519 AMAQI
11th Oct 20255010 AMAQI
11th Oct 20255611 AMAQI
11th Oct 20257012 PMAQI
11th Oct 2025721 PMAQI
11th Oct 2025622 PMAQI
11th Oct 2025563 PMAQI
11th Oct 2025524 PMAQI
11th Oct 2025495 PMAQI
11th Oct 2025486 PMAQI
11th Oct 2025527 PMAQI
11th Oct 2025528 PMAQI
11th Oct 2025549 PMAQI
11th Oct 20255410 PMAQI
11th Oct 20255311 PMAQI
12th Oct 20255512 AMAQI
12th Oct 2025571 AMAQI
12th Oct 2025672 AMAQI
12th Oct 2025673 AMAQI
12th Oct 2025674 AMAQI
12th Oct 2025585 AMAQI
21°C18/27°C
12th Oct 2025596 AMAQI
12th Oct 2025657 AMAQI
12th Oct 2025698 AMAQI
12th Oct 2025739 AMAQI
12th Oct 20257410 AMAQI
12th Oct 20256811 AMAQI
12th Oct 20257012 PMAQI
12th Oct 2025681 PMAQI
12th Oct 2025652 PMAQI
12th Oct 2025633 PMAQI
12th Oct 2025634 PMAQI
12th Oct 2025645 PMAQI
12th Oct 2025556 PMAQI
12th Oct 2025547 PMAQI
12th Oct 2025548 PMAQI
12th Oct 2025539 PMAQI
12th Oct 20255210 PMAQI
12th Oct 20255411 PMAQI
13th Oct 20255512 AMAQI
13th Oct 2025611 AMAQI
13th Oct 2025712 AMAQI
13th Oct 2025893 AMAQI
13th Oct 2025774 AMAQI
13th Oct 2025755 AMAQI
19°C14/26°C
13th Oct 2025816 AMAQI
13th Oct 2025707 AMAQI
13th Oct 2025628 AMAQI
13th Oct 2025639 AMAQI
13th Oct 20256310 AMAQI
13th Oct 20256411 AMAQI
13th Oct 20256012 PMAQI
13th Oct 2025781 PMAQI
13th Oct 2025672 PMAQI
13th Oct 2025643 PMAQI
13th Oct 2025564 PMAQI
13th Oct 2025595 PMAQI
13th Oct 2025586 PMAQI
13th Oct 2025587 PMAQI
13th Oct 2025578 PMAQI
13th Oct 2025559 PMAQI
13th Oct 20255510 PMAQI
13th Oct 20255611 PMAQI
14th Oct 20255712 AMAQI
14th Oct 2025561 AMAQI
14th Oct 2025572 AMAQI
14th Oct 2025573 AMAQI
14th Oct 2025594 AMAQI
14th Oct 2025565 AMAQI
16°C14/20°C
14th Oct 2025576 AMAQI
14th Oct 2025547 AMAQI
14th Oct 2025538 AMAQI
14th Oct 2025579 AMAQI
14th Oct 20256310 AMAQI
14th Oct 20257311 AMAQI
14th Oct 20257912 PMAQI
14th Oct 2025781 PMAQI
14th Oct 2025732 PMAQI
14th Oct 2025833 PMAQI
14th Oct 2025744 PMAQI
14th Oct 2025575 PMAQI
14th Oct 2025646 PMAQI
14th Oct 2025537 PMAQI
14th Oct 2025238 PMAQI
14th Oct 2025219 PMAQI
14th Oct 20251010 PMAQI
14th Oct 2025811 PMAQI
15th Oct 2025812 AMAQI
15th Oct 202571 AMAQI
15th Oct 202592 AMAQI
15th Oct 2025343 AMAQI
15th Oct 2025484 AMAQI
15th Oct 2025415 AMAQI
17°C13/21°C
15th Oct 2025306 AMAQI
15th Oct 2025557 AMAQI
15th Oct 2025528 AMAQI
15th Oct 2025409 AMAQI
15th Oct 20254110 AMAQI
15th Oct 20252811 AMAQI
15th Oct 20253212 PMAQI
15th Oct 2025431 PMAQI
15th Oct 2025372 PMAQI
15th Oct 2025153 PMAQI
15th Oct 2025134 PMAQI
15th Oct 2025125 PMAQI
15th Oct 2025116 PMAQI
15th Oct 2025107 PMAQI
15th Oct 2025108 PMAQI
15th Oct 2025109 PMAQI
15th Oct 20252410 PMAQI
15th Oct 20252111 PMAQI
16th Oct 20251712 AMAQI
16th Oct 2025331 AMAQI
16th Oct 2025162 AMAQI
16th Oct 2025133 AMAQI
16th Oct 2025364 AMAQI
16th Oct 2025445 AMAQI
17°C13/20°C
16th Oct 2025566 AMAQI
16th Oct 2025587 AMAQI
16th Oct 2025608 AMAQI
16th Oct 2025709 AMAQI
16th Oct 20256710 AMAQI
16th Oct 20256511 AMAQI
16th Oct 20255312 PMAQI
16th Oct 2025411 PMAQI
16th Oct 2025232 PMAQI
16th Oct 2025193 PMAQI
16th Oct 2025194 PMAQI
16th Oct 2025175 PMAQI
16th Oct 2025196 PMAQI
16th Oct 2025167 PMAQI
16th Oct 2025168 PMAQI
16th Oct 2025159 PMAQI
16th Oct 20252610 PMAQI
16th Oct 20253911 PMAQI
17th Oct 20253912 AMAQI
17th Oct 2025541 AMAQI
17th Oct 2025592 AMAQI
17th Oct 2025643 AMAQI
17th Oct 2025654 AMAQI
17th Oct 2025665 AMAQI
17°C11/25°C
17th Oct 2025706 AMAQI
17th Oct 2025637 AMAQI
17th Oct 2025588 AMAQI
17th Oct 2025559 AMAQI
17th Oct 20255910 AMAQI
17th Oct 20256411 AMAQI
17th Oct 20256612 PMAQI
17th Oct 2025811 PMAQI
17th Oct 2025752 PMAQI
17th Oct 2025503 PMAQI
17th Oct 2025464 PMAQI
17th Oct 2025385 PMAQI
17th Oct 2025376 PMAQI
17th Oct 2025427 PMAQI
17th Oct 2025408 PMAQI
17th Oct 2025399 PMAQI
17th Oct 20254810 PMAQI
17th Oct 20255311 PMAQI
18th Oct 20255712 AMAQI
18th Oct 2025731 AMAQI
18th Oct 2025832 AMAQI
18th Oct 2025973 AMAQI
18th Oct 2025694 AMAQI
18th Oct 2025655 AMAQI
19°C13/28°C
18th Oct 2025676 AMAQI
18th Oct 2025697 AMAQI
18th Oct 2025678 AMAQI
18th Oct 2025669 AMAQI
18th Oct 20256410 AMAQI
18th Oct 20257811 AMAQI
18th Oct 20256412 PMAQI
18th Oct 2025561 PMAQI
18th Oct 2025502 PMAQI
18th Oct 2025473 PMAQI
18th Oct 2025384 PMAQI
18th Oct 2025235 PMAQI
18th Oct 2025176 PMAQI
18th Oct 2025177 PMAQI
18th Oct 2025248 PMAQI
18th Oct 2025419 PMAQI
18th Oct 20254810 PMAQI
18th Oct 20255211 PMAQI
19th Oct 20256412 AMAQI
19th Oct 2025881 AMAQI
19th Oct 2025792 AMAQI
19th Oct 2025803 AMAQI
19th Oct 2025674 AMAQI
19th Oct 2025675 AMAQI
21°C14/32°C
19th Oct 2025736 AMAQI
19th Oct 2025727 AMAQI
19th Oct 2025728 AMAQI
19th Oct 2025689 AMAQI
19th Oct 20256710 AMAQI
19th Oct 20257311 AMAQI
19th Oct 20256612 PMAQI
19th Oct 2025581 PMAQI
19th Oct 2025502 PMAQI
19th Oct 2025303 PMAQI
19th Oct 2025284 PMAQI
19th Oct 2025545 PMAQI
19th Oct 2025566 PMAQI
19th Oct 2025417 PMAQI
19th Oct 2025338 PMAQI
19th Oct 2025379 PMAQI
19th Oct 20253710 PMAQI
19th Oct 20255511 PMAQI
20th Oct 20256112 AMAQI
20th Oct 2025711 AMAQI
20th Oct 2025772 AMAQI
20th Oct 2025773 AMAQI
20th Oct 2025634 AMAQI
20th Oct 2025605 AMAQI
19°C14/31°C
20th Oct 2025636 AMAQI
20th Oct 2025637 AMAQI
20th Oct 2025738 AMAQI
20th Oct 2025789 AMAQI
20th Oct 20258010 AMAQI
20th Oct 20258111 AMAQI
20th Oct 20258112 PMAQI
20th Oct 2025741 PMAQI
20th Oct 2025672 PMAQI
20th Oct 2025563 PMAQI
20th Oct 2025374 PMAQI
20th Oct 2025225 PMAQI
20th Oct 2025206 PMAQI
20th Oct 2025247 PMAQI
20th Oct 2025188 PMAQI
20th Oct 2025189 PMAQI
20th Oct 20253210 PMAQI
20th Oct 20255011 PMAQI
21st Oct 20255212 AMAQI
21st Oct 2025621 AMAQI
21st Oct 2025732 AMAQI
21st Oct 2025703 AMAQI
21st Oct 2025644 AMAQI
21st Oct 2025775 AMAQI
20°C15/30°C
21st Oct 2025756 AMAQI
21st Oct 2025587 AMAQI
21st Oct 2025648 AMAQI
21st Oct 2025679 AMAQI
21st Oct 20257010 AMAQI
21st Oct 20257211 AMAQI
21st Oct 20256812 PMAQI
21st Oct 2025581 PMAQI
21st Oct 2025632 PMAQI
21st Oct 2025603 PMAQI
21st Oct 2025544 PMAQI
21st Oct 2025525 PMAQI
21st Oct 2025516 PMAQI
21st Oct 2025537 PMAQI
21st Oct 2025528 PMAQI
21st Oct 2025489 PMAQI
21st Oct 20254810 PMAQI
21st Oct 20255511 PMAQI
22nd Oct 20255712 AMAQI
22nd Oct 2025581 AMAQI
22nd Oct 2025562 AMAQI
22nd Oct 2025563 AMAQI
22nd Oct 2025574 AMAQI
22nd Oct 2025575 AMAQI
17°C13/23°C
22nd Oct 2025566 AMAQI
22nd Oct 2025587 AMAQI
22nd Oct 2025618 AMAQI
22nd Oct 2025629 AMAQI
22nd Oct 20256310 AMAQI
22nd Oct 20256111 AMAQI
22nd Oct 20255412 PMAQI
22nd Oct 2025461 PMAQI
22nd Oct 2025452 PMAQI
22nd Oct 2025453 PMAQI
22nd Oct 2025454 PMAQI
22nd Oct 2025465 PMAQI
22nd Oct 2025436 PMAQI
22nd Oct 2025377 PMAQI
22nd Oct 2025378 PMAQI
22nd Oct 2025339 PMAQI
22nd Oct 20253310 PMAQI
22nd Oct 20253311 PMAQI
23rd Oct 20253412 AMAQI
23rd Oct 2025321 AMAQI
23rd Oct 2025322 AMAQI
23rd Oct 2025303 AMAQI
23rd Oct 2025324 AMAQI
23rd Oct 2025305 AMAQI
18°C15/22°C
23rd Oct 2025306 AMAQI
23rd Oct 2025427 AMAQI
23rd Oct 2025568 AMAQI
23rd Oct 2025599 AMAQI
23rd Oct 20255610 AMAQI
23rd Oct 20256411 AMAQI
23rd Oct 20256812 PMAQI
23rd Oct 2025661 PMAQI
23rd Oct 2025632 PMAQI
23rd Oct 2025533 PMAQI
23rd Oct 2025424 PMAQI
23rd Oct 2025385 PMAQI
23rd Oct 2025356 PMAQI
23rd Oct 2025357 PMAQI
23rd Oct 2025338 PMAQI
23rd Oct 2025339 PMAQI
23rd Oct 20253310 PMAQI
23rd Oct 20253511 PMAQI
24th Oct 20254012 AMAQI
24th Oct 2025481 AMAQI
24th Oct 2025642 AMAQI
24th Oct 2025773 AMAQI
24th Oct 2025724 AMAQI
24th Oct 2025715 AMAQI
18°C14/23°C
24th Oct 2025686 AMAQI
24th Oct 2025637 AMAQI
24th Oct 2025758 AMAQI
24th Oct 2025899 AMAQI
24th Oct 20258610 AMAQI
24th Oct 20258211 AMAQI
24th Oct 20258512 PMAQI
24th Oct 2025871 PMAQI
24th Oct 2025772 PMAQI
24th Oct 2025613 PMAQI
24th Oct 2025574 PMAQI
24th Oct 2025565 PMAQI
24th Oct 2025546 PMAQI
24th Oct 2025537 PMAQI
24th Oct 2025538 PMAQI
24th Oct 2025549 PMAQI
24th Oct 20255610 PMAQI
24th Oct 20255811 PMAQI
25th Oct 20255912 AMAQI
25th Oct 2025651 AMAQI
25th Oct 2025702 AMAQI
25th Oct 2025763 AMAQI
25th Oct 2025804 AMAQI
25th Oct 2025865 AMAQI
17°C13/26°C
25th Oct 2025866 AMAQI
25th Oct 2025877 AMAQI
25th Oct 2025848 AMAQI
25th Oct 2025739 AMAQI
25th Oct 20257610 AMAQI
25th Oct 20257911 AMAQI
25th Oct 20257312 PMAQI
25th Oct 2025691 PMAQI
25th Oct 2025702 PMAQI
25th Oct 2025673 PMAQI
25th Oct 2025624 PMAQI
25th Oct 2025585 PMAQI
25th Oct 2025546 PMAQI
25th Oct 2025507 PMAQI
25th Oct 2025508 PMAQI
25th Oct 2025509 PMAQI
25th Oct 20255110 PMAQI
25th Oct 20255411 PMAQI
26th Oct 20255512 AMAQI
26th Oct 2025561 AMAQI
26th Oct 2025592 AMAQI
26th Oct 2025693 AMAQI
26th Oct 2025784 AMAQI
26th Oct 2025825 AMAQI
18°C16/23°C
26th Oct 2025866 AMAQI
6 AM26th Oct 2025947 AMAQI
26th Oct 2025838 AMAQI
26th Oct 2025759 AMAQI
26th Oct 20258210 AMAQI
26th Oct 20258111 AMAQI
26th Oct 20256712 PMAQI
12 PM26th Oct 2025621 PMAQI
26th Oct 2025612 PMAQI
26th Oct 2025583 PMAQI
26th Oct 2025554 PMAQI
26th Oct 2025525 PMAQI
26th Oct 2025476 PMAQI
6 PM26th Oct 2025427 PMAQI
26th Oct 2025398 PMAQI
12 AM
5 AM
17°C14/22°C
Day time
Avg. Highest Time
11 AM
64AQI
1 hours / Day
30 hours / Month
Avg. Lowest Time
4 PM - 6 PM
45AQI
3 hours / Day
90 hours / Month
In the last 30 days, during the daytime, the highest AQI was between 11 AM to 11 AM (Avg. 64), while the lowest AQI was between 4 PM to 6 PM (Avg. 45).
Night time
Avg. Highest Time
3 AM - 5 AM
53AQI
3 hours / Day
90 hours / Month
Avg. Lowest Time
8 PM - 9 PM
38AQI
2 hours / Day
60 hours / Month
In the last 30 days, during the daytime, the highest AQI was between 3 AM to 5 AM (Avg. 53), while the lowest AQI was between 8 PM to 9 PM (Avg. 38).
2025 Days Vs Air Quality
San Ysidro, San Diego, California, United States
2025
54%
116
46%
98
Total number of days with different AQI categories in last 300 days in 2025 (65 days remaining)
Good
116 DaysModerate
98 DaysPoor
0 DaysUnhealthy
0 DaysSevere
0 DaysHazardous
0 DaysUnder WHO’s Safe Air Quality Limits: 54%
Health Risk Level:
Considerable
In 2025, 54% of 300 days were within WHO’s safe air quality limits, and 46% exceeded them. The risk of health issues is Considerable, with potential for conditions in sensitive individuals.
Annual Air Quality Insights
San Ysidro, San Diego, 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
2nd January 2025
3rd January 2025
4th January 2025
5th January 2025
6th January 2025
7th January 2025
8th January 2025
9th January 2025
10th January 2025
11th January 2025
12th January 2025
13th January 2025
14th January 2025
15th January 2025
16th January 2025
17th January 2025
18th January 2025
19th January 2025
20th January 2025
21st January 2025
22nd January 2025
23rd January 2025
24th January 2025
25th January 2025
26th January 2025
27th January 2025
28th January 2025
29th January 2025
30th January 2025
31st January 2025
1st February 2025
2nd February 2025
3rd February 2025
4th February 2025
5th February 2025
6th February 2025
7th February 2025
8th February 2025
9th February 2025
10th February 2025
11th February 2025
12th February 2025
13th February 2025
14th February 2025
15th February 2025
16th February 2025
17th February 2025
18th February 2025
19th February 2025
20th February 2025
21st February 2025
22nd February 2025
23rd February 2025
24th February 2025
25th February 2025
26th February 2025
27th February 2025
28th February 2025
1st March 2025
2nd March 2025
3rd March 2025
4th March 2025
5th March 2025
6th March 2025
7th March 2025
8th March 2025
9th March 2025
10th March 2025
11th March 2025
12th March 2025
13th March 2025
14th March 2025
15th March 2025
16th March 2025
17th March 2025
18th March 2025
19th March 2025
20th March 2025
21st March 2025
22nd March 2025
23rd March 2025
24th March 2025
25th March 2025
26th March 2025
35AQI
35AQI
27th March 2025
30AQI
30AQI
28th March 2025
39AQI
39AQI
29th March 2025
48AQI
48AQI
30th March 2025
48AQI
48AQI
31st March 2025
32AQI
32AQI
1st April 2025
37AQI
37AQI
2nd April 2025
41AQI
41AQI
3rd April 2025
42AQI
42AQI
4th April 2025
41AQI
41AQI
5th April 2025
44AQI
44AQI
6th April 2025
40AQI
40AQI
7th April 2025
50AQI
50AQI
8th April 2025
58AQI
58AQI
9th April 2025
54AQI
54AQI
10th April 2025
51AQI
51AQI
11th April 2025
55AQI
55AQI
12th April 2025
60AQI
60AQI
13th April 2025
57AQI
57AQI
14th April 2025
56AQI
56AQI
15th April 2025
49AQI
49AQI
16th April 2025
48AQI
48AQI
17th April 2025
28AQI
28AQI
18th April 2025
30AQI
30AQI
19th April 2025
42AQI
42AQI
20th April 2025
54AQI
54AQI
21st April 2025
55AQI
55AQI
22nd April 2025
50AQI
50AQI
23rd April 2025
44AQI
44AQI
24th April 2025
42AQI
42AQI
25th April 2025
40AQI
40AQI
26th April 2025
30AQI
30AQI
27th April 2025
24AQI
24AQI
28th April 2025
26AQI
26AQI
29th April 2025
41AQI
41AQI
30th April 2025
54AQI
54AQI
1st May 2025
39AQI
39AQI
2nd May 2025
36AQI
36AQI
3rd May 2025
35AQI
35AQI
4th May 2025
36AQI
36AQI
5th May 2025
31AQI
31AQI
6th May 2025
48AQI
48AQI
7th May 2025
48AQI
48AQI
8th May 2025
52AQI
52AQI
9th May 2025
54AQI
54AQI
10th May 2025
52AQI
52AQI
11th May 2025
57AQI
57AQI
12th May 2025
54AQI
54AQI
13th May 2025
36AQI
36AQI
14th May 2025
39AQI
39AQI
15th May 2025
53AQI
53AQI
16th May 2025
55AQI
55AQI
17th May 2025
52AQI
52AQI
18th May 2025
38AQI
38AQI
19th May 2025
50AQI
50AQI
20th May 2025
59AQI
59AQI
21st May 2025
57AQI
57AQI
22nd May 2025
61AQI
61AQI
23rd May 2025
51AQI
51AQI
24th May 2025
44AQI
44AQI
25th May 2025
38AQI
38AQI
26th May 2025
37AQI
37AQI
27th May 2025
33AQI
33AQI
28th May 2025
47AQI
47AQI
29th May 2025
42AQI
42AQI
30th May 2025
50AQI
50AQI
31st May 2025
60AQI
60AQI
1st June 2025
56AQI
56AQI
2nd June 2025
48AQI
48AQI
3rd June 2025
31AQI
31AQI
4th June 2025
33AQI
33AQI
5th June 2025
31AQI
31AQI
6th June 2025
31AQI
31AQI
7th June 2025
34AQI
34AQI
8th June 2025
36AQI
36AQI
9th June 2025
43AQI
43AQI
10th June 2025
50AQI
50AQI
11th June 2025
48AQI
48AQI
12th June 2025
54AQI
54AQI
13th June 2025
60AQI
60AQI
14th June 2025
58AQI
58AQI
15th June 2025
58AQI
58AQI
16th June 2025
63AQI
63AQI
17th June 2025
65AQI
65AQI
18th June 2025
65AQI
65AQI
19th June 2025
62AQI
62AQI
20th June 2025
63AQI
63AQI
21st June 2025
62AQI
62AQI
22nd June 2025
60AQI
60AQI
23rd June 2025
60AQI
60AQI
24th June 2025
70AQI
70AQI
25th June 2025
60AQI
60AQI
26th June 2025
56AQI
56AQI
27th June 2025
57AQI
57AQI
28th June 2025
55AQI
55AQI
29th June 2025
50AQI
50AQI
30th June 2025
46AQI
46AQI
1st July 2025
48AQI
48AQI
2nd July 2025
47AQI
47AQI
3rd July 2025
49AQI
49AQI
4th July 2025
47AQI
47AQI
5th July 2025
56AQI
56AQI
6th July 2025
56AQI
56AQI
7th July 2025
57AQI
57AQI
8th July 2025
55AQI
55AQI
9th July 2025
46AQI
46AQI
10th July 2025
47AQI
47AQI
11th July 2025
56AQI
56AQI
12th July 2025
53AQI
53AQI
13th July 2025
49AQI
49AQI
14th July 2025
44AQI
44AQI
15th July 2025
40AQI
40AQI
16th July 2025
36AQI
36AQI
17th July 2025
27AQI
27AQI
18th July 2025
29AQI
29AQI
19th July 2025
44AQI
44AQI
20th July 2025
46AQI
46AQI
21st July 2025
38AQI
38AQI
22nd July 2025
28AQI
28AQI
23rd July 2025
28AQI
28AQI
24th July 2025
32AQI
32AQI
25th July 2025
26AQI
26AQI
26th July 2025
24AQI
24AQI
27th July 2025
26AQI
26AQI
28th July 2025
30AQI
30AQI
29th July 2025
41AQI
41AQI
30th July 2025
53AQI
53AQI
31st July 2025
54AQI
54AQI
1st August 2025
55AQI
55AQI
2nd August 2025
46AQI
46AQI
3rd August 2025
50AQI
50AQI
4th August 2025
63AQI
63AQI
5th August 2025
68AQI
68AQI
6th August 2025
62AQI
62AQI
7th August 2025
60AQI
60AQI
8th August 2025
54AQI
54AQI
9th August 2025
54AQI
54AQI
10th August 2025
57AQI
57AQI
11th August 2025
54AQI
54AQI
12th August 2025
59AQI
59AQI
13th August 2025
59AQI
59AQI
14th August 2025
57AQI
57AQI
15th August 2025
52AQI
52AQI
16th August 2025
37AQI
37AQI
17th August 2025
43AQI
43AQI
18th August 2025
51AQI
51AQI
19th August 2025
50AQI
50AQI
20th August 2025
53AQI
53AQI
21st August 2025
55AQI
55AQI
22nd August 2025
60AQI
60AQI
23rd August 2025
59AQI
59AQI
24th August 2025
54AQI
54AQI
25th August 2025
53AQI
53AQI
26th August 2025
54AQI
54AQI
27th August 2025
53AQI
53AQI
28th August 2025
69AQI
69AQI
29th August 2025
54AQI
54AQI
30th August 2025
50AQI
50AQI
31st August 2025
54AQI
54AQI
1st September 2025
54AQI
54AQI
2nd September 2025
56AQI
56AQI
3rd September 2025
52AQI
52AQI
4th September 2025
51AQI
51AQI
5th September 2025
53AQI
53AQI
6th September 2025
44AQI
44AQI
7th September 2025
43AQI
43AQI
8th September 2025
41AQI
41AQI
9th September 2025
28AQI
28AQI
10th September 2025
30AQI
30AQI
11th September 2025
38AQI
38AQI
12th September 2025
32AQI
32AQI
13th September 2025
44AQI
44AQI
14th September 2025
50AQI
50AQI
15th September 2025
54AQI
54AQI
16th September 2025
57AQI
57AQI
17th September 2025
51AQI
51AQI
18th September 2025
50AQI
50AQI
19th September 2025
48AQI
48AQI
20th September 2025
45AQI
45AQI
21st September 2025
45AQI
45AQI
22nd September 2025
49AQI
49AQI
23rd September 2025
43AQI
43AQI
24th September 2025
47AQI
47AQI
25th September 2025
46AQI
46AQI
26th September 2025
31AQI
31AQI
27th September 2025
22AQI
22AQI
28th September 2025
41AQI
41AQI
29th September 2025
49AQI
49AQI
30th September 2025
43AQI
43AQI
1st October 2025
49AQI
49AQI
2nd October 2025
35AQI
35AQI
3rd October 2025
35AQI
35AQI
4th October 2025
52AQI
52AQI
5th October 2025
61AQI
61AQI
6th October 2025
50AQI
50AQI
7th October 2025
60AQI
60AQI
8th October 2025
56AQI
56AQI
9th October 2025
51AQI
51AQI
10th October 2025
49AQI
49AQI
11th October 2025
54AQI
54AQI
12th October 2025
62AQI
62AQI
13th October 2025
65AQI
65AQI
14th October 2025
53AQI
53AQI
15th October 2025
23AQI
23AQI
16th October 2025
32AQI
32AQI
17th October 2025
54AQI
54AQI
18th October 2025
56AQI
56AQI
19th October 2025
61AQI
61AQI
20th October 2025
55AQI
55AQI
21st October 2025
61AQI
61AQI
22nd October 2025
50AQI
50AQI
23rd October 2025
40AQI
40AQI
24th October 2025
64AQI
64AQI
25th October 2025
66AQI
66AQI
26th October 2025
27th October 2025
28th October 2025
29th October 2025
30th October 2025
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
45AQI
47AQI
52AQI
42AQI
55AQI
45AQI
52AQI
No. of days
Jan.Feb.Mar.Apr.MayJun.Jul.Aug.Sep.Oct.Nov.Dec.Total Days
202548AQI
6
20
10
18
13
12
18
23
8
6
25
22
8
9
16
116
98
Highest AQI recorded in
August55AQI
Lowest AQI recorded in
March39AQI
Most & Least Polluted Years Over the Last 1 Years
Most Polluted Year Recorded
2025(Avg.)
48AQILeast Polluted Year Recorded
2025(Avg.)
48AQISan Ysidro's annual 2025 AQI (48) shows an average percentage change of NaN% (improved AQI) compared to previous years: .
