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+
August Air Quality Analysis
San Ysidro, San Diego, California, United States
2025
AQI
.
Days
AQI Trends: Highest and Lowest
Highest AQI recorded on
5th Aug 2025
68AQILowest AQI recorded on
2nd Aug 2025
46AQISame Day Analysis (8th August ):
On this day, AQI across the 1 years varied significantly: 2025 ranks 1st highest AQI at 54 of Moderate air quality on the same day.
Download 2024 Annual Data
World Air Quality Report
Day & Night AQI Trend: 8th Aug - 9th Aug 2025
San Ysidro, San Diego, California, United States
AQI
Day
Night
.
5 AM8th Aug 2025
7 PM
4 AM9th Aug 2025
Day time
Avg. Highest Time
12PM8th Aug
59AQI
Avg. Lowest Time
8AM8th Aug
51AQI
Night time
Avg. Highest Time
8PM8th Aug
54AQI
Avg. Lowest Time
12AM9th Aug
52AQI
In the last 24 hours,
San Ysidro's AQI reached its highest point of 59 at 12 PM during the Day, while the lowest point, 51, was recorded at 8 AM during the Day between 8th Aug and 9th Aug 2025.
Day & Night AQI Trend : Jul - Aug 2025
San Ysidro, San Diego, California, United States
JulAug
10th - 11th11th - 12th12th - 13th13th - 14th14th - 15th15th - 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
Day
Night
10th Jul 2025405 AMAQI
10th Jul 2025406 AMAQI
10th Jul 2025427 AMAQI
10th Jul 2025418 AMAQI
10th Jul 2025409 AMAQI
10th Jul 20254610 AMAQI
10th Jul 20255111 AMAQI
10th Jul 20255312 PMAQI
10th Jul 2025531 PMAQI
10th Jul 2025532 PMAQI
10th Jul 2025543 PMAQI
10th Jul 2025544 PMAQI
10th Jul 2025565 PMAQI
10th Jul 2025576 PMAQI
10th Jul 2025467 PMAQI
10th Jul 2025448 PMAQI
10th Jul 2025539 PMAQI
10th Jul 20255310 PMAQI
10th Jul 20255411 PMAQI
11th Jul 20255412 AMAQI
11th Jul 2025541 AMAQI
11th Jul 2025542 AMAQI
11th Jul 2025543 AMAQI
11th Jul 2025554 AMAQI
21°C18/25°C
11th Jul 2025575 AMAQI
11th Jul 2025586 AMAQI
11th Jul 2025597 AMAQI
11th Jul 2025608 AMAQI
11th Jul 2025589 AMAQI
11th Jul 20255810 AMAQI
11th Jul 20256011 AMAQI
11th Jul 20256212 PMAQI
11th Jul 2025621 PMAQI
11th Jul 2025592 PMAQI
11th Jul 2025563 PMAQI
11th Jul 2025564 PMAQI
11th Jul 2025555 PMAQI
11th Jul 2025556 PMAQI
11th Jul 2025567 PMAQI
11th Jul 2025548 PMAQI
11th Jul 2025549 PMAQI
11th Jul 20255310 PMAQI
11th Jul 20255311 PMAQI
12th Jul 20255212 AMAQI
12th Jul 2025521 AMAQI
12th Jul 2025522 AMAQI
12th Jul 2025523 AMAQI
12th Jul 2025534 AMAQI
20°C17/23°C
12th Jul 2025555 AMAQI
12th Jul 2025556 AMAQI
12th Jul 2025587 AMAQI
12th Jul 2025568 AMAQI
12th Jul 2025549 AMAQI
12th Jul 20255310 AMAQI
12th Jul 20255311 AMAQI
12th Jul 20255212 PMAQI
12th Jul 2025521 PMAQI
12th Jul 2025532 PMAQI
12th Jul 2025553 PMAQI
12th Jul 2025544 PMAQI
12th Jul 2025545 PMAQI
12th Jul 2025536 PMAQI
12th Jul 2025527 PMAQI
12th Jul 2025528 PMAQI
12th Jul 2025509 PMAQI
12th Jul 20255110 PMAQI
12th Jul 20254811 PMAQI
13th Jul 20254812 AMAQI
13th Jul 2025471 AMAQI
13th Jul 2025442 AMAQI
13th Jul 2025473 AMAQI
13th Jul 2025464 AMAQI
19°C15/23°C
13th Jul 2025465 AMAQI
13th Jul 2025476 AMAQI
13th Jul 2025517 AMAQI
13th Jul 2025528 AMAQI
13th Jul 2025529 AMAQI
13th Jul 20255210 AMAQI
13th Jul 20255211 AMAQI
13th Jul 20255412 PMAQI
13th Jul 2025571 PMAQI
13th Jul 2025572 PMAQI
13th Jul 2025573 PMAQI
13th Jul 2025564 PMAQI
13th Jul 2025545 PMAQI
13th Jul 2025526 PMAQI
13th Jul 2025517 PMAQI
13th Jul 2025498 PMAQI
13th Jul 2025489 PMAQI
13th Jul 20254510 PMAQI
13th Jul 20254111 PMAQI
14th Jul 20254212 AMAQI
14th Jul 2025421 AMAQI
14th Jul 2025432 AMAQI
14th Jul 2025433 AMAQI
14th Jul 2025394 AMAQI
20°C17/23°C
14th Jul 2025375 AMAQI
14th Jul 2025416 AMAQI
14th Jul 2025447 AMAQI
14th Jul 2025468 AMAQI
14th Jul 2025479 AMAQI
14th Jul 20255010 AMAQI
14th Jul 20255211 AMAQI
14th Jul 20255512 PMAQI
14th Jul 2025551 PMAQI
14th Jul 2025532 PMAQI
14th Jul 2025523 PMAQI
14th Jul 2025524 PMAQI
14th Jul 2025485 PMAQI
14th Jul 2025466 PMAQI
14th Jul 2025447 PMAQI
14th Jul 2025428 PMAQI
14th Jul 2025379 PMAQI
14th Jul 20253610 PMAQI
14th Jul 20253811 PMAQI
15th Jul 20253812 AMAQI
15th Jul 2025341 AMAQI
15th Jul 2025362 AMAQI
15th Jul 2025353 AMAQI
15th Jul 2025334 AMAQI
20°C17/23°C
15th Jul 2025345 AMAQI
15th Jul 2025386 AMAQI
15th Jul 2025417 AMAQI
15th Jul 2025398 AMAQI
15th Jul 2025429 AMAQI
15th Jul 20254610 AMAQI
15th Jul 20255411 AMAQI
15th Jul 20255712 PMAQI
15th Jul 2025561 PMAQI
15th Jul 2025542 PMAQI
15th Jul 2025503 PMAQI
15th Jul 2025424 PMAQI
15th Jul 2025375 PMAQI
15th Jul 2025366 PMAQI
15th Jul 2025377 PMAQI
15th Jul 2025378 PMAQI
15th Jul 2025419 PMAQI
15th Jul 20253810 PMAQI
15th Jul 20253711 PMAQI
16th Jul 20253412 AMAQI
16th Jul 2025341 AMAQI
16th Jul 2025332 AMAQI
16th Jul 2025343 AMAQI
16th Jul 2025324 AMAQI
20°C17/23°C
16th Jul 2025305 AMAQI
16th Jul 2025336 AMAQI
16th Jul 2025357 AMAQI
16th Jul 2025358 AMAQI
16th Jul 2025389 AMAQI
16th Jul 20254210 AMAQI
16th Jul 20254711 AMAQI
16th Jul 20255012 PMAQI
16th Jul 2025521 PMAQI
16th Jul 2025502 PMAQI
16th Jul 2025443 PMAQI
16th Jul 2025394 PMAQI
16th Jul 2025355 PMAQI
16th Jul 2025366 PMAQI
16th Jul 2025367 PMAQI
16th Jul 2025338 PMAQI
16th Jul 2025269 PMAQI
16th Jul 20252510 PMAQI
16th Jul 20252411 PMAQI
17th Jul 20252412 AMAQI
17th Jul 2025271 AMAQI
17th Jul 2025252 AMAQI
17th Jul 2025243 AMAQI
17th Jul 2025234 AMAQI
20°C17/23°C
17th Jul 2025225 AMAQI
17th Jul 2025206 AMAQI
17th Jul 2025227 AMAQI
17th Jul 2025228 AMAQI
17th Jul 2025289 AMAQI
17th Jul 20253310 AMAQI
17th Jul 20253011 AMAQI
17th Jul 20253212 PMAQI
17th Jul 2025321 PMAQI
17th Jul 2025342 PMAQI
17th Jul 2025343 PMAQI
17th Jul 2025354 PMAQI
17th Jul 2025325 PMAQI
17th Jul 2025306 PMAQI
17th Jul 2025287 PMAQI
17th Jul 2025288 PMAQI
17th Jul 2025289 PMAQI
17th Jul 20252610 PMAQI
17th Jul 20252711 PMAQI
18th Jul 20252612 AMAQI
18th Jul 2025271 AMAQI
18th Jul 2025252 AMAQI
18th Jul 2025243 AMAQI
18th Jul 2025234 AMAQI
20°C17/24°C
18th Jul 2025245 AMAQI
18th Jul 2025236 AMAQI
18th Jul 2025247 AMAQI
18th Jul 2025248 AMAQI
18th Jul 2025269 AMAQI
18th Jul 20252710 AMAQI
18th Jul 20252811 AMAQI
18th Jul 20253012 PMAQI
18th Jul 2025321 PMAQI
18th Jul 2025322 PMAQI
18th Jul 2025313 PMAQI
18th Jul 2025304 PMAQI
18th Jul 2025315 PMAQI
18th Jul 2025336 PMAQI
18th Jul 2025297 PMAQI
18th Jul 2025298 PMAQI
18th Jul 2025389 PMAQI
18th Jul 20253910 PMAQI
18th Jul 20253611 PMAQI
19th Jul 20253412 AMAQI
19th Jul 2025341 AMAQI
19th Jul 2025362 AMAQI
19th Jul 2025393 AMAQI
19th Jul 2025444 AMAQI
20°C18/23°C
19th Jul 2025505 AMAQI
19th Jul 2025456 AMAQI
19th Jul 2025477 AMAQI
19th Jul 2025448 AMAQI
19th Jul 2025429 AMAQI
19th Jul 20254410 AMAQI
19th Jul 20254811 AMAQI
19th Jul 20255012 PMAQI
19th Jul 2025541 PMAQI
19th Jul 2025552 PMAQI
19th Jul 2025513 PMAQI
19th Jul 2025474 PMAQI
19th Jul 2025465 PMAQI
19th Jul 2025446 PMAQI
19th Jul 2025447 PMAQI
19th Jul 2025468 PMAQI
19th Jul 2025479 PMAQI
19th Jul 20254310 PMAQI
19th Jul 20254311 PMAQI
20th Jul 20254212 AMAQI
20th Jul 2025421 AMAQI
20th Jul 2025452 AMAQI
20th Jul 2025463 AMAQI
20th Jul 2025474 AMAQI
20°C18/24°C
20th Jul 2025485 AMAQI
20th Jul 2025476 AMAQI
20th Jul 2025467 AMAQI
20th Jul 2025468 AMAQI
20th Jul 2025469 AMAQI
20th Jul 20254910 AMAQI
20th Jul 20255011 AMAQI
20th Jul 20255312 PMAQI
20th Jul 2025521 PMAQI
20th Jul 2025522 PMAQI
20th Jul 2025483 PMAQI
20th Jul 2025484 PMAQI
20th Jul 2025475 PMAQI
20th Jul 2025486 PMAQI
20th Jul 2025467 PMAQI
20th Jul 2025468 PMAQI
20th Jul 2025429 PMAQI
20th Jul 20254010 PMAQI
20th Jul 20254011 PMAQI
21st Jul 20254212 AMAQI
21st Jul 2025421 AMAQI
21st Jul 2025422 AMAQI
21st Jul 2025413 AMAQI
21st Jul 2025384 AMAQI
19°C17/22°C
21st Jul 2025395 AMAQI
21st Jul 2025376 AMAQI
21st Jul 2025367 AMAQI
21st Jul 2025368 AMAQI
21st Jul 2025389 AMAQI
21st Jul 20253810 AMAQI
21st Jul 20253711 AMAQI
21st Jul 20253912 PMAQI
21st Jul 2025421 PMAQI
21st Jul 2025412 PMAQI
21st Jul 2025393 PMAQI
21st Jul 2025384 PMAQI
21st Jul 2025385 PMAQI
21st Jul 2025386 PMAQI
21st Jul 2025397 PMAQI
21st Jul 2025388 PMAQI
21st Jul 2025359 PMAQI
21st Jul 20253210 PMAQI
21st Jul 20253111 PMAQI
22nd Jul 20253212 AMAQI
22nd Jul 2025311 AMAQI
22nd Jul 2025312 AMAQI
22nd Jul 2025293 AMAQI
22nd Jul 2025274 AMAQI
19°C17/22°C
22nd Jul 2025245 AMAQI
22nd Jul 2025246 AMAQI
22nd Jul 2025277 AMAQI
22nd Jul 2025288 AMAQI
22nd Jul 2025279 AMAQI
22nd Jul 20252810 AMAQI
22nd Jul 20252811 AMAQI
22nd Jul 20252912 PMAQI
22nd Jul 2025281 PMAQI
22nd Jul 2025282 PMAQI
22nd Jul 2025293 PMAQI
22nd Jul 2025284 PMAQI
22nd Jul 2025295 PMAQI
22nd Jul 2025286 PMAQI
22nd Jul 2025287 PMAQI
22nd Jul 2025278 PMAQI
22nd Jul 2025269 PMAQI
22nd Jul 20252610 PMAQI
22nd Jul 20252611 PMAQI
23rd Jul 20252612 AMAQI
23rd Jul 2025281 AMAQI
23rd Jul 2025282 AMAQI
23rd Jul 2025273 AMAQI
23rd Jul 2025254 AMAQI
19°C17/21°C
23rd Jul 2025255 AMAQI
23rd Jul 2025276 AMAQI
23rd Jul 2025287 AMAQI
23rd Jul 2025288 AMAQI
23rd Jul 2025289 AMAQI
23rd Jul 20253010 AMAQI
23rd Jul 20253011 AMAQI
23rd Jul 20253112 PMAQI
23rd Jul 2025311 PMAQI
23rd Jul 2025312 PMAQI
23rd Jul 2025323 PMAQI
23rd Jul 2025314 PMAQI
23rd Jul 2025305 PMAQI
23rd Jul 2025306 PMAQI
23rd Jul 2025277 PMAQI
23rd Jul 2025288 PMAQI
23rd Jul 2025289 PMAQI
23rd Jul 20252910 PMAQI
23rd Jul 20252911 PMAQI
24th Jul 20253012 AMAQI
24th Jul 2025301 AMAQI
24th Jul 2025292 AMAQI
24th Jul 2025313 AMAQI
24th Jul 2025284 AMAQI
20°C18/24°C
24th Jul 2025305 AMAQI
24th Jul 2025316 AMAQI
24th Jul 2025317 AMAQI
24th Jul 2025328 AMAQI
24th Jul 2025329 AMAQI
24th Jul 20253410 AMAQI
24th Jul 20253911 AMAQI
24th Jul 20254012 PMAQI
24th Jul 2025401 PMAQI
24th Jul 2025402 PMAQI
24th Jul 2025393 PMAQI
24th Jul 2025364 PMAQI
24th Jul 2025325 PMAQI
24th Jul 2025316 PMAQI
24th Jul 2025317 PMAQI
24th Jul 2025308 PMAQI
24th Jul 2025279 PMAQI
24th Jul 20252710 PMAQI
24th Jul 20252811 PMAQI
25th Jul 20252812 AMAQI
25th Jul 2025271 AMAQI
25th Jul 2025272 AMAQI
25th Jul 2025253 AMAQI
25th Jul 2025234 AMAQI
20°C17/23°C
25th Jul 2025245 AMAQI
25th Jul 2025266 AMAQI
25th Jul 2025247 AMAQI
25th Jul 2025258 AMAQI
25th Jul 2025259 AMAQI
25th Jul 20252710 AMAQI
25th Jul 20252711 AMAQI
25th Jul 20252612 PMAQI
25th Jul 2025251 PMAQI
25th Jul 2025242 PMAQI
25th Jul 2025253 PMAQI
25th Jul 2025264 PMAQI
25th Jul 2025245 PMAQI
25th Jul 2025246 PMAQI
25th Jul 2025257 PMAQI
25th Jul 2025268 PMAQI
25th Jul 2025289 PMAQI
25th Jul 20252710 PMAQI
25th Jul 20252611 PMAQI
26th Jul 20252712 AMAQI
26th Jul 2025261 AMAQI
26th Jul 2025252 AMAQI
26th Jul 2025243 AMAQI
26th Jul 2025234 AMAQI
19°C17/22°C
26th Jul 2025225 AMAQI
26th Jul 2025226 AMAQI
26th Jul 2025247 AMAQI
26th Jul 2025248 AMAQI
26th Jul 2025269 AMAQI
26th Jul 20253110 AMAQI
26th Jul 20253011 AMAQI
26th Jul 20252612 PMAQI
26th Jul 2025261 PMAQI
26th Jul 2025272 PMAQI
26th Jul 2025243 PMAQI
26th Jul 2025244 PMAQI
26th Jul 2025225 PMAQI
26th Jul 2025236 PMAQI
26th Jul 2025237 PMAQI
26th Jul 2025238 PMAQI
26th Jul 2025229 PMAQI
26th Jul 20252210 PMAQI
26th Jul 20252211 PMAQI
27th Jul 20252212 AMAQI
27th Jul 2025251 AMAQI
27th Jul 2025262 AMAQI
27th Jul 2025253 AMAQI
27th Jul 2025224 AMAQI
19°C17/23°C
27th Jul 2025235 AMAQI
27th Jul 2025256 AMAQI
27th Jul 2025257 AMAQI
27th Jul 2025268 AMAQI
27th Jul 2025289 AMAQI
27th Jul 20252810 AMAQI
27th Jul 20252811 AMAQI
27th Jul 20252812 PMAQI
27th Jul 2025291 PMAQI
27th Jul 2025302 PMAQI
27th Jul 2025293 PMAQI
27th Jul 2025294 PMAQI
27th Jul 2025285 PMAQI
27th Jul 2025276 PMAQI
27th Jul 2025267 PMAQI
27th Jul 2025268 PMAQI
27th Jul 2025259 PMAQI
27th Jul 20252510 PMAQI
27th Jul 20252511 PMAQI
28th Jul 20252612 AMAQI
28th Jul 2025261 AMAQI
28th Jul 2025272 AMAQI
28th Jul 2025283 AMAQI
28th Jul 2025264 AMAQI
19°C17/23°C
28th Jul 2025285 AMAQI
28th Jul 2025296 AMAQI
28th Jul 2025327 AMAQI
28th Jul 2025298 AMAQI
28th Jul 2025289 AMAQI
28th Jul 20253110 AMAQI
28th Jul 20253211 AMAQI
28th Jul 20253212 PMAQI
28th Jul 2025321 PMAQI
28th Jul 2025332 PMAQI
28th Jul 2025333 PMAQI
28th Jul 2025334 PMAQI
28th Jul 2025335 PMAQI
28th Jul 2025326 PMAQI
28th Jul 2025317 PMAQI
28th Jul 2025308 PMAQI
28th Jul 2025339 PMAQI
28th Jul 20253110 PMAQI
28th Jul 20253111 PMAQI
29th Jul 20253212 AMAQI
29th Jul 2025321 AMAQI
29th Jul 2025342 AMAQI
29th Jul 2025353 AMAQI
29th Jul 2025364 AMAQI
19°C16/23°C
29th Jul 2025365 AMAQI
29th Jul 2025386 AMAQI
29th Jul 2025417 AMAQI
29th Jul 2025418 AMAQI
29th Jul 2025459 AMAQI
29th Jul 20255310 AMAQI
29th Jul 20255011 AMAQI
29th Jul 20254912 PMAQI
29th Jul 2025471 PMAQI
29th Jul 2025512 PMAQI
29th Jul 2025483 PMAQI
29th Jul 2025484 PMAQI
29th Jul 2025485 PMAQI
29th Jul 2025486 PMAQI
29th Jul 2025427 PMAQI
29th Jul 2025408 PMAQI
29th Jul 2025409 PMAQI
29th Jul 20254010 PMAQI
29th Jul 20254111 PMAQI
30th Jul 20254112 AMAQI
30th Jul 2025431 AMAQI
30th Jul 2025432 AMAQI
30th Jul 2025443 AMAQI
30th Jul 2025494 AMAQI
20°C17/24°C
30th Jul 2025455 AMAQI
30th Jul 2025486 AMAQI
30th Jul 2025497 AMAQI
30th Jul 2025518 AMAQI
30th Jul 2025519 AMAQI
30th Jul 20255510 AMAQI
30th Jul 20255711 AMAQI
30th Jul 20255612 PMAQI
30th Jul 2025561 PMAQI
30th Jul 2025622 PMAQI
30th Jul 2025633 PMAQI
30th Jul 2025634 PMAQI
30th Jul 2025635 PMAQI
30th Jul 2025636 PMAQI
30th Jul 2025637 PMAQI
30th Jul 2025638 PMAQI
30th Jul 2025559 PMAQI
30th Jul 20255010 PMAQI
30th Jul 20255111 PMAQI
31st Jul 20255012 AMAQI
31st Jul 2025511 AMAQI
31st Jul 2025512 AMAQI
31st Jul 2025513 AMAQI
31st Jul 2025524 AMAQI
21°C17/25°C
31st Jul 2025525 AMAQI
31st Jul 2025546 AMAQI
31st Jul 2025557 AMAQI
31st Jul 2025568 AMAQI
31st Jul 2025569 AMAQI
31st Jul 20255610 AMAQI
31st Jul 20255811 AMAQI
31st Jul 20255812 PMAQI
31st Jul 2025581 PMAQI
31st Jul 2025582 PMAQI
31st Jul 2025573 PMAQI
31st Jul 2025564 PMAQI
31st Jul 2025575 PMAQI
31st Jul 2025566 PMAQI
31st Jul 2025547 PMAQI
31st Jul 2025548 PMAQI
31st Jul 2025529 PMAQI
31st Jul 20255010 PMAQI
31st Jul 20254911 PMAQI
1st Aug 20254612 AMAQI
1st Aug 2025451 AMAQI
1st Aug 2025482 AMAQI
1st Aug 2025523 AMAQI
1st Aug 2025544 AMAQI
20°C17/25°C
1st Aug 2025585 AMAQI
1st Aug 2025636 AMAQI
1st Aug 2025617 AMAQI
1st Aug 2025628 AMAQI
1st Aug 2025639 AMAQI
1st Aug 20256310 AMAQI
1st Aug 20256211 AMAQI
1st Aug 20256212 PMAQI
1st Aug 2025631 PMAQI
1st Aug 2025652 PMAQI
1st Aug 2025623 PMAQI
1st Aug 2025624 PMAQI
1st Aug 2025605 PMAQI
1st Aug 2025606 PMAQI
1st Aug 2025617 PMAQI
1st Aug 2025518 PMAQI
1st Aug 2025449 PMAQI
1st Aug 20254410 PMAQI
1st Aug 20254311 PMAQI
2nd Aug 20254212 AMAQI
2nd Aug 2025401 AMAQI
2nd Aug 2025392 AMAQI
2nd Aug 2025403 AMAQI
2nd Aug 2025394 AMAQI
20°C17/23°C
2nd Aug 2025435 AMAQI
2nd Aug 2025516 AMAQI
2nd Aug 2025527 AMAQI
2nd Aug 2025528 AMAQI
2nd Aug 2025539 AMAQI
2nd Aug 20255310 AMAQI
2nd Aug 20255411 AMAQI
2nd Aug 20255612 PMAQI
2nd Aug 2025561 PMAQI
2nd Aug 2025562 PMAQI
2nd Aug 2025553 PMAQI
2nd Aug 2025544 PMAQI
2nd Aug 2025535 PMAQI
2nd Aug 2025486 PMAQI
2nd Aug 2025487 PMAQI
2nd Aug 2025438 PMAQI
2nd Aug 2025389 PMAQI
2nd Aug 20253610 PMAQI
2nd Aug 20253611 PMAQI
3rd Aug 20253712 AMAQI
3rd Aug 2025361 AMAQI
3rd Aug 2025362 AMAQI
3rd Aug 2025373 AMAQI
3rd Aug 2025434 AMAQI
20°C17/25°C
3rd Aug 2025525 AMAQI
3rd Aug 2025576 AMAQI
3rd Aug 2025587 AMAQI
3rd Aug 2025558 AMAQI
3rd Aug 2025559 AMAQI
3rd Aug 20255310 AMAQI
3rd Aug 20255211 AMAQI
3rd Aug 20255312 PMAQI
3rd Aug 2025541 PMAQI
3rd Aug 2025552 PMAQI
3rd Aug 2025563 PMAQI
3rd Aug 2025564 PMAQI
3rd Aug 2025555 PMAQI
3rd Aug 2025556 PMAQI
3rd Aug 2025537 PMAQI
3rd Aug 2025548 PMAQI
3rd Aug 2025539 PMAQI
3rd Aug 20255410 PMAQI
3rd Aug 20255411 PMAQI
4th Aug 20255312 AMAQI
4th Aug 2025541 AMAQI
4th Aug 2025542 AMAQI
4th Aug 2025543 AMAQI
4th Aug 2025554 AMAQI
20°C17/24°C
4th Aug 2025565 AMAQI
4th Aug 2025606 AMAQI
4th Aug 2025647 AMAQI
4th Aug 2025648 AMAQI
4th Aug 2025679 AMAQI
4th Aug 20256910 AMAQI
4th Aug 20257711 AMAQI
4th Aug 20258012 PMAQI
4th Aug 2025831 PMAQI
4th Aug 2025772 PMAQI
4th Aug 2025743 PMAQI
4th Aug 2025694 PMAQI
4th Aug 2025645 PMAQI
4th Aug 2025646 PMAQI
4th Aug 2025607 PMAQI
4th Aug 2025608 PMAQI
4th Aug 2025629 PMAQI
4th Aug 20256210 PMAQI
4th Aug 20255811 PMAQI
5th Aug 20255912 AMAQI
5th Aug 2025591 AMAQI
5th Aug 2025602 AMAQI
5th Aug 2025623 AMAQI
5th Aug 2025624 AMAQI
20°C17/25°C
5th Aug 2025655 AMAQI
5th Aug 2025706 AMAQI
5th Aug 2025667 AMAQI
5th Aug 2025688 AMAQI
5th Aug 2025769 AMAQI
5th Aug 20257310 AMAQI
5th Aug 20257311 AMAQI
5th Aug 20257712 PMAQI
5th Aug 2025811 PMAQI
5th Aug 2025792 PMAQI
5th Aug 2025793 PMAQI
5th Aug 2025774 PMAQI
5th Aug 2025755 PMAQI
5th Aug 2025736 PMAQI
5th Aug 2025697 PMAQI
5th Aug 2025648 PMAQI
5th Aug 2025649 PMAQI
5th Aug 20256210 PMAQI
5th Aug 20255911 PMAQI
6th Aug 20255812 AMAQI
6th Aug 2025571 AMAQI
6th Aug 2025572 AMAQI
6th Aug 2025563 AMAQI
6th Aug 2025564 AMAQI
21°C17/25°C
6th Aug 2025545 AMAQI
6th Aug 2025576 AMAQI
6th Aug 2025587 AMAQI
6th Aug 2025568 AMAQI
6th Aug 2025619 AMAQI
6th Aug 20256510 AMAQI
6th Aug 20256911 AMAQI
6th Aug 20257312 PMAQI
6th Aug 2025731 PMAQI
6th Aug 2025692 PMAQI
6th Aug 2025683 PMAQI
6th Aug 2025684 PMAQI
6th Aug 2025685 PMAQI
6th Aug 2025676 PMAQI
6th Aug 2025597 PMAQI
6th Aug 2025628 PMAQI
6th Aug 2025639 PMAQI
6th Aug 20256110 PMAQI
6th Aug 20256011 PMAQI
7th Aug 20256012 AMAQI
7th Aug 2025581 AMAQI
7th Aug 2025582 AMAQI
7th Aug 2025583 AMAQI
7th Aug 2025564 AMAQI
22°C18/27°C
7th Aug 2025565 AMAQI
7th Aug 2025556 AMAQI
7th Aug 2025587 AMAQI
7th Aug 2025588 AMAQI
7th Aug 2025609 AMAQI
7th Aug 20256410 AMAQI
7th Aug 20257011 AMAQI
7th Aug 20256812 PMAQI
7th Aug 2025691 PMAQI
7th Aug 2025672 PMAQI
7th Aug 2025643 PMAQI
7th Aug 2025664 PMAQI
7th Aug 2025615 PMAQI
7th Aug 2025606 PMAQI
7th Aug 2025607 PMAQI
7th Aug 2025598 PMAQI
7th Aug 2025579 PMAQI
7th Aug 20255610 PMAQI
7th Aug 20255411 PMAQI
8th Aug 20255512 AMAQI
8th Aug 2025551 AMAQI
8th Aug 2025552 AMAQI
8th Aug 2025553 AMAQI
8th Aug 2025524 AMAQI
24°C19/28°C
8th Aug 2025525 AMAQI
8th Aug 2025526 AMAQI
8th Aug 2025547 AMAQI
8th Aug 2025518 AMAQI
8th Aug 2025539 AMAQI
8th Aug 20255510 AMAQI
8th Aug 20255611 AMAQI
8th Aug 20255912 PMAQI
8th Aug 2025591 PMAQI
8th Aug 2025582 PMAQI
8th Aug 2025583 PMAQI
8th Aug 2025584 PMAQI
8th Aug 2025565 PMAQI
8th Aug 2025556 PMAQI
8th Aug 2025547 PMAQI
8th Aug 2025548 PMAQI
8th Aug 2025539 PMAQI
8th Aug 20255210 PMAQI
8th Aug 20255211 PMAQI
9th Aug 20255212 AMAQI
9th Aug 2025531 AMAQI
9th Aug 2025542 AMAQI
9th Aug 2025543 AMAQI
9th Aug 2025534 AMAQI
23°C20/26°C
9th Aug 2025545 AMAQI
5 AM9th Aug 2025566 AMAQI
9th Aug 2025537 AMAQI
9th Aug 2025548 AMAQI
9th Aug 2025529 AMAQI
9th Aug 20255010 AMAQI
9th Aug 20255211 AMAQI
9th Aug 20255212 PMAQI
12 PM9th Aug 2025521 PMAQI
9th Aug 2025532 PMAQI
7 PM
12 AM
4 AM
--°C/°C
Day time
Avg. Highest Time
5 AM - 7 PM
46AQI
15 hours / Day
450 hours / Month
Avg. Lowest Time
5 AM - 7 PM
46AQI
15 hours / Day
450 hours / Month
In the last 30 days, during the daytime, the highest AQI was between 5 AM to 7 PM (Avg. 46), while the lowest AQI was between 5 AM to 7 PM (Avg. 46).
Night time
Avg. Highest Time
8 PM - 11 PM
42AQI
4 hours / Day
120 hours / Month
Avg. Lowest Time
12 AM - 4 AM
40AQI
5 hours / Day
150 hours / Month
In the last 30 days, during the daytime, the highest AQI was between 8 PM to 11 PM (Avg. 42), while the lowest AQI was between 12 AM to 4 AM (Avg. 40).
2025 Days Vs Air Quality
San Ysidro, San Diego, California, United States
2025
60%
81
40%
55
Total number of days with different AQI categories in last 221 days in 2025 (144 days remaining)
Good
81 DaysModerate
55 DaysPoor
0 DaysUnhealthy
0 DaysSevere
0 DaysHazardous
0 DaysUnder WHO’s Safe Air Quality Limits: 60%
Health Risk Level:
Moderate
In 2025, 60% of 221 days were within WHO’s safe air quality limits, and 40% exceeded them. The risk of health issues is Moderate, particularly for individuals with respiratory or heart conditions.
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.
1st March 2025
35AQI
35AQI
2nd March 2025
30AQI
30AQI
3rd March 2025
39AQI
39AQI
4th March 2025
48AQI
48AQI
5th March 2025
48AQI
48AQI
6th 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
39AQI
45AQI
47AQI
52AQI
42AQI
57AQI
No. of days
Jan.Feb.Mar.Apr.MayJun.Jul.Aug.Sep.Oct.Nov.Dec.Total Days
202547AQI
6
20
10
18
13
12
18
23
8
2
6
81
55
Highest AQI recorded in
August57AQI
Lowest AQI recorded in
March39AQI
Most & Least Polluted Years Over the Last 1 Years
Most Polluted Year Recorded
2025(Avg.)
47AQILeast Polluted Year Recorded
2025(Avg.)
47AQISan Ysidro's annual 2025 AQI (47) shows an average percentage change of NaN% (improved AQI) compared to previous years: .
