San Marcos, Texas, 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 Marcos, Texas, United States
2025
AQI
.
Days
AQI Trends: Highest and Lowest
Highest AQI recorded on
3rd Aug 2025
34AQILowest AQI recorded on
4th Aug 2025
30AQISame Day Analysis (4th August ):
On this day, AQI across the 1 years varied significantly: 2025 ranks 1st highest AQI at 30 of Good air quality on the same day.
Download 2024 Annual Data
World Air Quality Report
Day & Night AQI Trend: 5th Aug - 6th Aug 2025
San Marcos, Texas, United States
AQI
Day
Night
.
6 AM5th Aug 2025
8 PM
5 AM6th Aug 2025
Day time
Avg. Highest Time
2PM5th Aug
54AQI
Avg. Lowest Time
6AM5th Aug
22AQI
Night time
Avg. Highest Time
12AM6th Aug
45AQI
Avg. Lowest Time
11PM5th Aug
39AQI
In the last 24 hours,
San Marcos's AQI reached its highest point of 54 at 2 PM during the Day, while the lowest point, 22, was recorded at 6 AM during the Day between 5th Aug and 6th Aug 2025.
Day & Night AQI Trend : Jul - Aug 2025
San Marcos, Texas, United States
JulAug
07th - 08th08th - 09th09th - 10th10th - 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
Day
Night
7th Jul 2025526 AMAQI
7th Jul 2025537 AMAQI
7th Jul 2025548 AMAQI
7th Jul 2025559 AMAQI
7th Jul 20255810 AMAQI
7th Jul 20255911 AMAQI
7th Jul 20256012 PMAQI
7th Jul 2025611 PMAQI
7th Jul 2025602 PMAQI
7th Jul 2025603 PMAQI
7th Jul 2025604 PMAQI
7th Jul 2025595 PMAQI
7th Jul 2025586 PMAQI
7th Jul 2025567 PMAQI
7th Jul 2025568 PMAQI
7th Jul 2025559 PMAQI
7th Jul 20255410 PMAQI
7th Jul 20255411 PMAQI
8th Jul 20255212 AMAQI
8th Jul 2025511 AMAQI
8th Jul 2025452 AMAQI
8th Jul 2025463 AMAQI
8th Jul 2025474 AMAQI
8th Jul 2025435 AMAQI
27°C23/31°C
8th Jul 2025446 AMAQI
8th Jul 2025517 AMAQI
8th Jul 2025508 AMAQI
8th Jul 2025529 AMAQI
8th Jul 20255510 AMAQI
8th Jul 20254711 AMAQI
8th Jul 20254412 PMAQI
8th Jul 2025471 PMAQI
8th Jul 2025462 PMAQI
8th Jul 2025483 PMAQI
8th Jul 2025524 PMAQI
8th Jul 2025475 PMAQI
8th Jul 2025416 PMAQI
8th Jul 2025467 PMAQI
8th Jul 2025438 PMAQI
8th Jul 2025399 PMAQI
8th Jul 20253310 PMAQI
8th Jul 20253611 PMAQI
9th Jul 20254012 AMAQI
9th Jul 2025401 AMAQI
9th Jul 2025332 AMAQI
9th Jul 2025313 AMAQI
9th Jul 2025324 AMAQI
9th Jul 2025315 AMAQI
28°C23/34°C
9th Jul 2025306 AMAQI
9th Jul 2025327 AMAQI
9th Jul 2025328 AMAQI
9th Jul 2025319 AMAQI
9th Jul 20253210 AMAQI
9th Jul 20253611 AMAQI
9th Jul 20253812 PMAQI
9th Jul 2025391 PMAQI
9th Jul 2025292 PMAQI
9th Jul 2025333 PMAQI
9th Jul 2025344 PMAQI
9th Jul 2025325 PMAQI
9th Jul 2025366 PMAQI
9th Jul 2025337 PMAQI
9th Jul 2025308 PMAQI
9th Jul 2025279 PMAQI
9th Jul 20252710 PMAQI
9th Jul 20252511 PMAQI
10th Jul 20252712 AMAQI
10th Jul 2025291 AMAQI
10th Jul 2025272 AMAQI
10th Jul 2025273 AMAQI
10th Jul 2025314 AMAQI
10th Jul 2025315 AMAQI
28°C24/37°C
10th Jul 2025366 AMAQI
10th Jul 2025337 AMAQI
10th Jul 2025348 AMAQI
10th Jul 2025339 AMAQI
10th Jul 20254410 AMAQI
10th Jul 20255211 AMAQI
10th Jul 20255312 PMAQI
10th Jul 2025541 PMAQI
10th Jul 2025562 PMAQI
10th Jul 2025563 PMAQI
10th Jul 2025554 PMAQI
10th Jul 2025565 PMAQI
10th Jul 2025566 PMAQI
10th Jul 2025417 PMAQI
10th Jul 2025418 PMAQI
10th Jul 2025509 PMAQI
10th Jul 20255010 PMAQI
10th Jul 20255211 PMAQI
11th Jul 20255212 AMAQI
11th Jul 2025531 AMAQI
11th Jul 2025502 AMAQI
11th Jul 2025523 AMAQI
11th Jul 2025474 AMAQI
11th Jul 2025475 AMAQI
28°C22/37°C
11th Jul 2025436 AMAQI
11th Jul 2025467 AMAQI
11th Jul 2025488 AMAQI
11th Jul 2025479 AMAQI
11th Jul 20254810 AMAQI
11th Jul 20254611 AMAQI
11th Jul 20254612 PMAQI
11th Jul 2025481 PMAQI
11th Jul 2025482 PMAQI
11th Jul 2025463 PMAQI
11th Jul 2025474 PMAQI
11th Jul 2025505 PMAQI
11th Jul 2025466 PMAQI
11th Jul 2025477 PMAQI
11th Jul 2025468 PMAQI
11th Jul 2025429 PMAQI
11th Jul 20254310 PMAQI
11th Jul 20254111 PMAQI
12th Jul 20254012 AMAQI
12th Jul 2025401 AMAQI
12th Jul 2025342 AMAQI
12th Jul 2025333 AMAQI
12th Jul 2025304 AMAQI
12th Jul 2025325 AMAQI
28°C23/34°C
12th Jul 2025316 AMAQI
12th Jul 2025367 AMAQI
12th Jul 2025428 AMAQI
12th Jul 2025349 AMAQI
12th Jul 20253510 AMAQI
12th Jul 20254011 AMAQI
12th Jul 20254012 PMAQI
12th Jul 2025421 PMAQI
12th Jul 2025452 PMAQI
12th Jul 2025423 PMAQI
12th Jul 2025434 PMAQI
12th Jul 2025485 PMAQI
12th Jul 2025416 PMAQI
12th Jul 2025367 PMAQI
12th Jul 2025388 PMAQI
12th Jul 2025399 PMAQI
12th Jul 20253910 PMAQI
12th Jul 20253911 PMAQI
13th Jul 20254012 AMAQI
13th Jul 2025381 AMAQI
13th Jul 2025292 AMAQI
13th Jul 2025273 AMAQI
13th Jul 2025294 AMAQI
13th Jul 2025305 AMAQI
29°C25/35°C
13th Jul 2025316 AMAQI
13th Jul 2025307 AMAQI
13th Jul 2025288 AMAQI
13th Jul 2025319 AMAQI
13th Jul 20253710 AMAQI
13th Jul 20253411 AMAQI
13th Jul 20253512 PMAQI
13th Jul 2025381 PMAQI
13th Jul 2025312 PMAQI
13th Jul 2025283 PMAQI
13th Jul 2025284 PMAQI
13th Jul 2025275 PMAQI
13th Jul 2025266 PMAQI
13th Jul 2025297 PMAQI
13th Jul 2025278 PMAQI
13th Jul 2025229 PMAQI
13th Jul 20253010 PMAQI
13th Jul 20252811 PMAQI
14th Jul 20252612 AMAQI
14th Jul 2025261 AMAQI
14th Jul 2025262 AMAQI
14th Jul 2025263 AMAQI
14th Jul 2025274 AMAQI
14th Jul 2025295 AMAQI
28°C24/33°C
14th Jul 2025336 AMAQI
14th Jul 2025337 AMAQI
14th Jul 2025368 AMAQI
14th Jul 2025369 AMAQI
14th Jul 20253810 AMAQI
14th Jul 20253711 AMAQI
14th Jul 20253612 PMAQI
14th Jul 2025361 PMAQI
14th Jul 2025382 PMAQI
14th Jul 2025363 PMAQI
14th Jul 2025384 PMAQI
14th Jul 2025385 PMAQI
14th Jul 2025396 PMAQI
14th Jul 2025367 PMAQI
14th Jul 2025358 PMAQI
14th Jul 2025399 PMAQI
14th Jul 20253310 PMAQI
14th Jul 20253611 PMAQI
15th Jul 20253512 AMAQI
15th Jul 2025331 AMAQI
15th Jul 2025362 AMAQI
15th Jul 2025373 AMAQI
15th Jul 2025414 AMAQI
15th Jul 2025435 AMAQI
28°C24/34°C
15th Jul 2025416 AMAQI
15th Jul 2025487 AMAQI
15th Jul 2025518 AMAQI
15th Jul 2025549 AMAQI
15th Jul 20255810 AMAQI
15th Jul 20255411 AMAQI
15th Jul 20255812 PMAQI
15th Jul 2025581 PMAQI
15th Jul 2025562 PMAQI
15th Jul 2025573 PMAQI
15th Jul 2025564 PMAQI
15th Jul 2025565 PMAQI
15th Jul 2025566 PMAQI
15th Jul 2025547 PMAQI
15th Jul 2025548 PMAQI
15th Jul 2025539 PMAQI
15th Jul 20255210 PMAQI
15th Jul 20255411 PMAQI
16th Jul 20255412 AMAQI
16th Jul 2025541 AMAQI
16th Jul 2025542 AMAQI
16th Jul 2025563 AMAQI
16th Jul 2025564 AMAQI
16th Jul 2025585 AMAQI
30°C22/38°C
16th Jul 2025566 AMAQI
16th Jul 2025587 AMAQI
16th Jul 2025588 AMAQI
16th Jul 2025589 AMAQI
16th Jul 20255810 AMAQI
16th Jul 20256211 AMAQI
16th Jul 20256312 PMAQI
16th Jul 2025631 PMAQI
16th Jul 2025652 PMAQI
16th Jul 2025643 PMAQI
16th Jul 2025664 PMAQI
16th Jul 2025675 PMAQI
16th Jul 2025696 PMAQI
16th Jul 2025607 PMAQI
16th Jul 2025588 PMAQI
16th Jul 2025639 PMAQI
16th Jul 20256210 PMAQI
16th Jul 20256411 PMAQI
17th Jul 20256412 AMAQI
17th Jul 2025641 AMAQI
17th Jul 2025632 AMAQI
17th Jul 2025623 AMAQI
17th Jul 2025614 AMAQI
17th Jul 2025625 AMAQI
30°C23/39°C
17th Jul 2025646 AMAQI
17th Jul 2025607 AMAQI
17th Jul 2025608 AMAQI
17th Jul 2025609 AMAQI
17th Jul 20256010 AMAQI
17th Jul 20256211 AMAQI
17th Jul 20256312 PMAQI
17th Jul 2025651 PMAQI
17th Jul 2025642 PMAQI
17th Jul 2025643 PMAQI
17th Jul 2025634 PMAQI
17th Jul 2025645 PMAQI
17th Jul 2025636 PMAQI
17th Jul 2025627 PMAQI
17th Jul 2025638 PMAQI
17th Jul 2025619 PMAQI
17th Jul 20256010 PMAQI
17th Jul 20255611 PMAQI
18th Jul 20255412 AMAQI
18th Jul 2025541 AMAQI
18th Jul 2025512 AMAQI
18th Jul 2025483 AMAQI
18th Jul 2025514 AMAQI
18th Jul 2025515 AMAQI
30°C22/39°C
18th Jul 2025506 AMAQI
18th Jul 2025507 AMAQI
18th Jul 2025508 AMAQI
18th Jul 2025459 AMAQI
18th Jul 20254610 AMAQI
18th Jul 20254411 AMAQI
18th Jul 20254212 PMAQI
18th Jul 2025411 PMAQI
18th Jul 2025442 PMAQI
18th Jul 2025443 PMAQI
18th Jul 2025454 PMAQI
18th Jul 2025465 PMAQI
18th Jul 2025446 PMAQI
18th Jul 2025477 PMAQI
18th Jul 2025488 PMAQI
18th Jul 2025479 PMAQI
18th Jul 20254710 PMAQI
18th Jul 20254311 PMAQI
19th Jul 20253812 AMAQI
19th Jul 2025351 AMAQI
19th Jul 2025342 AMAQI
19th Jul 2025373 AMAQI
19th Jul 2025364 AMAQI
19th Jul 2025315 AMAQI
29°C22/38°C
19th Jul 2025326 AMAQI
19th Jul 2025387 AMAQI
19th Jul 2025478 AMAQI
19th Jul 2025509 AMAQI
19th Jul 20255410 AMAQI
19th Jul 20255511 AMAQI
19th Jul 20255612 PMAQI
19th Jul 2025561 PMAQI
19th Jul 2025562 PMAQI
19th Jul 2025553 PMAQI
19th Jul 2025544 PMAQI
19th Jul 2025525 PMAQI
19th Jul 2025516 PMAQI
19th Jul 2025497 PMAQI
19th Jul 2025478 PMAQI
19th Jul 2025459 PMAQI
19th Jul 20254210 PMAQI
19th Jul 20254211 PMAQI
20th Jul 20254012 AMAQI
20th Jul 2025411 AMAQI
20th Jul 2025382 AMAQI
20th Jul 2025363 AMAQI
20th Jul 2025354 AMAQI
20th Jul 2025375 AMAQI
31°C23/39°C
20th Jul 2025386 AMAQI
20th Jul 2025367 AMAQI
20th Jul 2025378 AMAQI
20th Jul 2025419 AMAQI
20th Jul 20254410 AMAQI
20th Jul 20254211 AMAQI
20th Jul 20254412 PMAQI
20th Jul 2025451 PMAQI
20th Jul 2025492 PMAQI
20th Jul 2025473 PMAQI
20th Jul 2025484 PMAQI
20th Jul 2025465 PMAQI
20th Jul 2025486 PMAQI
20th Jul 2025457 PMAQI
20th Jul 2025458 PMAQI
20th Jul 2025509 PMAQI
20th Jul 20254310 PMAQI
20th Jul 20254311 PMAQI
21st Jul 20254412 AMAQI
21st Jul 2025471 AMAQI
21st Jul 2025432 AMAQI
21st Jul 2025383 AMAQI
21st Jul 2025384 AMAQI
21st Jul 2025415 AMAQI
28°C25/32°C
21st Jul 2025426 AMAQI
21st Jul 2025447 AMAQI
21st Jul 2025468 AMAQI
21st Jul 2025459 AMAQI
21st Jul 20254310 AMAQI
21st Jul 20254911 AMAQI
21st Jul 20255112 PMAQI
21st Jul 2025531 PMAQI
21st Jul 2025552 PMAQI
21st Jul 2025583 PMAQI
21st Jul 2025554 PMAQI
21st Jul 2025575 PMAQI
21st Jul 2025586 PMAQI
21st Jul 2025527 PMAQI
21st Jul 2025518 PMAQI
21st Jul 2025549 PMAQI
21st Jul 20255210 PMAQI
21st Jul 20255111 PMAQI
22nd Jul 20255012 AMAQI
22nd Jul 2025501 AMAQI
22nd Jul 2025432 AMAQI
22nd Jul 2025423 AMAQI
22nd Jul 2025384 AMAQI
22nd Jul 2025375 AMAQI
30°C24/36°C
22nd Jul 2025366 AMAQI
22nd Jul 2025357 AMAQI
22nd Jul 2025368 AMAQI
22nd Jul 2025369 AMAQI
22nd Jul 20253610 AMAQI
22nd Jul 20253411 AMAQI
22nd Jul 20253812 PMAQI
22nd Jul 2025401 PMAQI
22nd Jul 2025412 PMAQI
22nd Jul 2025373 PMAQI
22nd Jul 2025384 PMAQI
22nd Jul 2025415 PMAQI
22nd Jul 2025416 PMAQI
22nd Jul 2025427 PMAQI
22nd Jul 2025398 PMAQI
22nd Jul 2025389 PMAQI
22nd Jul 20253010 PMAQI
22nd Jul 20253511 PMAQI
23rd Jul 20253612 AMAQI
23rd Jul 2025381 AMAQI
23rd Jul 2025372 AMAQI
23rd Jul 2025383 AMAQI
23rd Jul 2025374 AMAQI
23rd Jul 2025365 AMAQI
30°C22/39°C
23rd Jul 2025386 AMAQI
23rd Jul 2025367 AMAQI
23rd Jul 2025338 AMAQI
23rd Jul 2025289 AMAQI
23rd Jul 20252910 AMAQI
23rd Jul 20253111 AMAQI
23rd Jul 20253312 PMAQI
23rd Jul 2025331 PMAQI
23rd Jul 2025342 PMAQI
23rd Jul 2025353 PMAQI
23rd Jul 2025314 PMAQI
23rd Jul 2025315 PMAQI
23rd Jul 2025306 PMAQI
23rd Jul 2025327 PMAQI
23rd Jul 2025348 PMAQI
23rd Jul 2025359 PMAQI
23rd Jul 20253510 PMAQI
23rd Jul 20253011 PMAQI
24th Jul 20253012 AMAQI
24th Jul 2025321 AMAQI
24th Jul 2025292 AMAQI
24th Jul 2025283 AMAQI
24th Jul 2025324 AMAQI
24th Jul 2025295 AMAQI
31°C24/39°C
24th Jul 2025256 AMAQI
24th Jul 2025297 AMAQI
24th Jul 2025288 AMAQI
24th Jul 2025259 AMAQI
24th Jul 20252610 AMAQI
24th Jul 20252311 AMAQI
24th Jul 20252612 PMAQI
24th Jul 2025321 PMAQI
24th Jul 2025352 PMAQI
24th Jul 2025303 PMAQI
24th Jul 2025284 PMAQI
24th Jul 2025265 PMAQI
24th Jul 2025226 PMAQI
24th Jul 2025287 PMAQI
24th Jul 2025288 PMAQI
24th Jul 2025209 PMAQI
24th Jul 20252610 PMAQI
24th Jul 20252511 PMAQI
25th Jul 20252812 AMAQI
25th Jul 2025271 AMAQI
25th Jul 2025232 AMAQI
25th Jul 2025223 AMAQI
25th Jul 2025204 AMAQI
25th Jul 2025245 AMAQI
31°C22/40°C
25th Jul 2025256 AMAQI
25th Jul 2025227 AMAQI
25th Jul 2025268 AMAQI
25th Jul 2025209 AMAQI
25th Jul 20252610 AMAQI
25th Jul 20253111 AMAQI
25th Jul 20253712 PMAQI
25th Jul 2025341 PMAQI
25th Jul 2025302 PMAQI
25th Jul 2025313 PMAQI
25th Jul 2025284 PMAQI
25th Jul 2025305 PMAQI
25th Jul 2025286 PMAQI
25th Jul 2025277 PMAQI
25th Jul 2025268 PMAQI
25th Jul 2025289 PMAQI
25th Jul 20252810 PMAQI
25th Jul 20252811 PMAQI
26th Jul 20253212 AMAQI
26th Jul 2025311 AMAQI
26th Jul 2025362 AMAQI
26th Jul 2025373 AMAQI
26th Jul 2025324 AMAQI
26th Jul 2025305 AMAQI
29°C23/36°C
26th Jul 2025266 AMAQI
26th Jul 2025267 AMAQI
26th Jul 2025248 AMAQI
26th Jul 2025239 AMAQI
26th Jul 20252410 AMAQI
26th Jul 20252511 AMAQI
26th Jul 20252412 PMAQI
26th Jul 2025261 PMAQI
26th Jul 2025252 PMAQI
26th Jul 2025243 PMAQI
26th Jul 2025284 PMAQI
26th Jul 2025295 PMAQI
26th Jul 2025326 PMAQI
26th Jul 2025317 PMAQI
26th Jul 2025308 PMAQI
26th Jul 2025389 PMAQI
26th Jul 20253410 PMAQI
26th Jul 20253211 PMAQI
27th Jul 20253412 AMAQI
27th Jul 2025351 AMAQI
27th Jul 2025322 AMAQI
27th Jul 2025353 AMAQI
27th Jul 2025374 AMAQI
27th Jul 2025395 AMAQI
28°C23/36°C
27th Jul 2025406 AMAQI
27th Jul 2025387 AMAQI
27th Jul 2025378 AMAQI
27th Jul 2025369 AMAQI
27th Jul 20254110 AMAQI
27th Jul 20254411 AMAQI
27th Jul 20254212 PMAQI
27th Jul 2025391 PMAQI
27th Jul 2025422 PMAQI
27th Jul 2025403 PMAQI
27th Jul 2025384 PMAQI
27th Jul 2025365 PMAQI
27th Jul 2025326 PMAQI
27th Jul 2025367 PMAQI
27th Jul 2025388 PMAQI
27th Jul 2025349 PMAQI
27th Jul 20253010 PMAQI
27th Jul 20252411 PMAQI
28th Jul 20252412 AMAQI
28th Jul 2025311 AMAQI
28th Jul 2025332 AMAQI
28th Jul 2025363 AMAQI
28th Jul 2025344 AMAQI
28th Jul 2025305 AMAQI
29°C25/35°C
28th Jul 2025336 AMAQI
28th Jul 2025407 AMAQI
28th Jul 2025458 AMAQI
28th Jul 2025439 AMAQI
28th Jul 20254810 AMAQI
28th Jul 20255211 AMAQI
28th Jul 20255512 PMAQI
28th Jul 2025571 PMAQI
28th Jul 2025542 PMAQI
28th Jul 2025543 PMAQI
28th Jul 2025564 PMAQI
28th Jul 2025565 PMAQI
28th Jul 2025556 PMAQI
28th Jul 2025487 PMAQI
28th Jul 2025468 PMAQI
28th Jul 2025539 PMAQI
28th Jul 20255210 PMAQI
28th Jul 20255311 PMAQI
29th Jul 20255612 AMAQI
29th Jul 2025581 AMAQI
29th Jul 2025602 AMAQI
29th Jul 2025603 AMAQI
29th Jul 2025594 AMAQI
29th Jul 2025595 AMAQI
30°C23/39°C
29th Jul 2025586 AMAQI
29th Jul 2025587 AMAQI
29th Jul 2025558 AMAQI
29th Jul 2025569 AMAQI
29th Jul 20255610 AMAQI
29th Jul 20255411 AMAQI
29th Jul 20255812 PMAQI
29th Jul 2025601 PMAQI
29th Jul 2025592 PMAQI
29th Jul 2025593 PMAQI
29th Jul 2025584 PMAQI
29th Jul 2025605 PMAQI
29th Jul 2025606 PMAQI
29th Jul 2025587 PMAQI
29th Jul 2025588 PMAQI
29th Jul 2025589 PMAQI
29th Jul 20255510 PMAQI
29th Jul 20255411 PMAQI
30th Jul 20255412 AMAQI
30th Jul 2025541 AMAQI
30th Jul 2025542 AMAQI
30th Jul 2025553 AMAQI
30th Jul 2025534 AMAQI
30th Jul 2025535 AMAQI
30°C23/40°C
30th Jul 2025516 AMAQI
30th Jul 2025507 AMAQI
30th Jul 2025488 AMAQI
30th Jul 2025489 AMAQI
30th Jul 20255310 AMAQI
30th Jul 20255711 AMAQI
30th Jul 20256012 PMAQI
30th Jul 2025581 PMAQI
30th Jul 2025572 PMAQI
30th Jul 2025573 PMAQI
30th Jul 2025574 PMAQI
30th Jul 2025575 PMAQI
30th Jul 2025576 PMAQI
30th Jul 2025577 PMAQI
30th Jul 2025578 PMAQI
30th Jul 2025519 PMAQI
30th Jul 20254510 PMAQI
30th Jul 20254211 PMAQI
31st Jul 20255012 AMAQI
31st Jul 2025521 AMAQI
31st Jul 2025502 AMAQI
31st Jul 2025463 AMAQI
31st Jul 2025514 AMAQI
31st Jul 2025515 AMAQI
31°C20/41°C
31st Jul 2025456 AMAQI
31st Jul 2025427 AMAQI
31st Jul 2025418 AMAQI
31st Jul 2025409 AMAQI
31st Jul 20254410 AMAQI
31st Jul 20254811 AMAQI
31st Jul 20255112 PMAQI
31st Jul 2025521 PMAQI
31st Jul 2025542 PMAQI
31st Jul 2025543 PMAQI
31st Jul 2025534 PMAQI
31st Jul 2025545 PMAQI
31st Jul 2025526 PMAQI
31st Jul 2025497 PMAQI
31st Jul 2025528 PMAQI
31st Jul 2025489 PMAQI
31st Jul 20253910 PMAQI
31st Jul 20253311 PMAQI
1st Aug 20253312 AMAQI
1st Aug 2025361 AMAQI
1st Aug 2025372 AMAQI
1st Aug 2025333 AMAQI
1st Aug 2025304 AMAQI
1st Aug 2025325 AMAQI
31°C21/41°C
1st Aug 2025326 AMAQI
1st Aug 2025307 AMAQI
1st Aug 2025288 AMAQI
1st Aug 2025289 AMAQI
1st Aug 20253110 AMAQI
1st Aug 20253311 AMAQI
1st Aug 20253412 PMAQI
1st Aug 2025341 PMAQI
1st Aug 2025362 PMAQI
1st Aug 2025333 PMAQI
1st Aug 2025314 PMAQI
1st Aug 2025355 PMAQI
1st Aug 2025346 PMAQI
1st Aug 2025327 PMAQI
1st Aug 2025328 PMAQI
1st Aug 2025269 PMAQI
1st Aug 20252010 PMAQI
1st Aug 20252611 PMAQI
2nd Aug 20253212 AMAQI
2nd Aug 2025301 AMAQI
2nd Aug 2025282 AMAQI
2nd Aug 2025243 AMAQI
2nd Aug 2025244 AMAQI
2nd Aug 2025245 AMAQI
32°C24/41°C
2nd Aug 2025256 AMAQI
2nd Aug 2025307 AMAQI
2nd Aug 2025298 AMAQI
2nd Aug 2025279 AMAQI
2nd Aug 20252310 AMAQI
2nd Aug 20252211 AMAQI
2nd Aug 20252712 PMAQI
2nd Aug 2025331 PMAQI
2nd Aug 2025292 PMAQI
2nd Aug 2025303 PMAQI
2nd Aug 2025284 PMAQI
2nd Aug 2025395 PMAQI
2nd Aug 2025456 PMAQI
2nd Aug 2025347 PMAQI
2nd Aug 2025348 PMAQI
2nd Aug 2025369 PMAQI
2nd Aug 20253910 PMAQI
2nd Aug 20253711 PMAQI
3rd Aug 20253512 AMAQI
3rd Aug 2025341 AMAQI
3rd Aug 2025342 AMAQI
3rd Aug 2025353 AMAQI
3rd Aug 2025334 AMAQI
3rd Aug 2025325 AMAQI
30°C24/41°C
3rd Aug 2025316 AMAQI
3rd Aug 2025217 AMAQI
3rd Aug 2025238 AMAQI
3rd Aug 2025269 AMAQI
3rd Aug 20253210 AMAQI
3rd Aug 20253311 AMAQI
3rd Aug 20253412 PMAQI
3rd Aug 2025411 PMAQI
3rd Aug 2025382 PMAQI
3rd Aug 2025343 PMAQI
3rd Aug 2025294 PMAQI
3rd Aug 2025355 PMAQI
3rd Aug 2025406 PMAQI
3rd Aug 2025347 PMAQI
3rd Aug 2025368 PMAQI
3rd Aug 2025389 PMAQI
3rd Aug 20253610 PMAQI
3rd Aug 20252911 PMAQI
4th Aug 20253412 AMAQI
4th Aug 2025351 AMAQI
4th Aug 2025352 AMAQI
4th Aug 2025333 AMAQI
4th Aug 2025324 AMAQI
4th Aug 2025355 AMAQI
31°C23/39°C
4th Aug 2025346 AMAQI
4th Aug 2025317 AMAQI
4th Aug 2025278 AMAQI
4th Aug 2025259 AMAQI
4th Aug 20253110 AMAQI
4th Aug 20253611 AMAQI
4th Aug 20253312 PMAQI
4th Aug 2025321 PMAQI
4th Aug 2025262 PMAQI
4th Aug 2025233 PMAQI
4th Aug 2025304 PMAQI
4th Aug 2025295 PMAQI
4th Aug 2025286 PMAQI
4th Aug 2025317 PMAQI
4th Aug 2025298 PMAQI
4th Aug 2025259 PMAQI
4th Aug 20252610 PMAQI
4th Aug 20251911 PMAQI
5th Aug 20252212 AMAQI
5th Aug 2025261 AMAQI
5th Aug 2025222 AMAQI
5th Aug 2025193 AMAQI
5th Aug 2025224 AMAQI
5th Aug 2025235 AMAQI
30°C25/37°C
5th Aug 2025226 AMAQI
5th Aug 2025267 AMAQI
5th Aug 2025318 AMAQI
5th Aug 2025269 AMAQI
5th Aug 20252610 AMAQI
5th Aug 20252411 AMAQI
5th Aug 20253612 PMAQI
5th Aug 2025501 PMAQI
5th Aug 2025542 PMAQI
5th Aug 2025523 PMAQI
5th Aug 2025544 PMAQI
5th Aug 2025545 PMAQI
5th Aug 2025526 PMAQI
5th Aug 2025277 PMAQI
5th Aug 2025398 PMAQI
5th Aug 2025439 PMAQI
5th Aug 20254010 PMAQI
5th Aug 20253911 PMAQI
6th Aug 20254512 AMAQI
6th Aug 2025421 AMAQI
6th Aug 2025402 AMAQI
6th Aug 2025423 AMAQI
6th Aug 2025404 AMAQI
6th Aug 2025415 AMAQI
31°C22/39°C
6 AM
1 PM
8 PM
1 AM
5 AM
--°C/°C
Day time
Avg. Highest Time
6 AM - 6 PM
42AQI
13 hours / Day
390 hours / Month
Avg. Lowest Time
6 AM - 9 AM
39AQI
4 hours / Day
120 hours / Month
In the last 30 days, during the daytime, the highest AQI was between 6 AM to 6 PM (Avg. 42), while the lowest AQI was between 6 AM to 9 AM (Avg. 39).
Night time
Avg. Highest Time
9 PM - 11 PM
40AQI
3 hours / Day
90 hours / Month
Avg. Lowest Time
2 AM - 5 AM
38AQI
4 hours / Day
120 hours / Month
In the last 30 days, during the daytime, the highest AQI was between 9 PM to 11 PM (Avg. 40), while the lowest AQI was between 2 AM to 5 AM (Avg. 38).
2025 Days Vs Air Quality
San Marcos, Texas, United States
2025
70%
92
30%
40
Total number of days with different AQI categories in last 218 days in 2025 (147 days remaining)
Good
92 DaysModerate
40 DaysPoor
0 DaysUnhealthy
0 DaysSevere
0 DaysHazardous
0 DaysUnder WHO’s Safe Air Quality Limits: 70%
Health Risk Level:
Low
In 2025, 70% of 218 days were within WHO’s safe air quality limits. The risk of health issues is Low, but the long-term effects, especially on vulnerable individuals, remain uncertain.
Annual Air Quality Insights
San Marcos, Texas, 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
30AQI
30AQI
2nd March 2025
26AQI
26AQI
3rd March 2025
26AQI
26AQI
4th March 2025
42AQI
42AQI
5th March 2025
68AQI
68AQI
6th March 2025
59AQI
59AQI
1st April 2025
54AQI
54AQI
2nd April 2025
64AQI
64AQI
3rd April 2025
71AQI
71AQI
4th April 2025
61AQI
61AQI
5th April 2025
30AQI
30AQI
6th April 2025
20AQI
20AQI
7th April 2025
22AQI
22AQI
8th April 2025
31AQI
31AQI
9th April 2025
36AQI
36AQI
10th April 2025
40AQI
40AQI
11th April 2025
42AQI
42AQI
12th April 2025
50AQI
50AQI
13th April 2025
40AQI
40AQI
14th April 2025
42AQI
42AQI
15th April 2025
46AQI
46AQI
16th April 2025
46AQI
46AQI
17th April 2025
40AQI
40AQI
18th April 2025
54AQI
54AQI
19th April 2025
62AQI
62AQI
20th April 2025
38AQI
38AQI
21st April 2025
26AQI
26AQI
22nd April 2025
43AQI
43AQI
23rd April 2025
41AQI
41AQI
24th April 2025
55AQI
55AQI
25th April 2025
50AQI
50AQI
26th April 2025
58AQI
58AQI
27th April 2025
48AQI
48AQI
28th April 2025
51AQI
51AQI
29th April 2025
45AQI
45AQI
30th April 2025
53AQI
53AQI
1st May 2025
57AQI
57AQI
2nd May 2025
43AQI
43AQI
3rd May 2025
28AQI
28AQI
4th May 2025
28AQI
28AQI
5th May 2025
33AQI
33AQI
6th May 2025
47AQI
47AQI
7th May 2025
40AQI
40AQI
8th May 2025
42AQI
42AQI
9th May 2025
26AQI
26AQI
10th May 2025
33AQI
33AQI
11th May 2025
37AQI
37AQI
12th May 2025
33AQI
33AQI
13th May 2025
39AQI
39AQI
14th May 2025
47AQI
47AQI
15th May 2025
61AQI
61AQI
16th May 2025
66AQI
66AQI
17th May 2025
69AQI
69AQI
18th May 2025
56AQI
56AQI
19th May 2025
62AQI
62AQI
20th May 2025
67AQI
67AQI
21st May 2025
54AQI
54AQI
22nd May 2025
58AQI
58AQI
23rd May 2025
48AQI
48AQI
24th May 2025
54AQI
54AQI
25th May 2025
58AQI
58AQI
26th May 2025
58AQI
58AQI
27th May 2025
34AQI
34AQI
28th May 2025
33AQI
33AQI
29th May 2025
34AQI
34AQI
30th May 2025
36AQI
36AQI
31st May 2025
43AQI
43AQI
1st June 2025
47AQI
47AQI
2nd June 2025
50AQI
50AQI
3rd June 2025
58AQI
58AQI
4th June 2025
54AQI
54AQI
5th June 2025
50AQI
50AQI
6th June 2025
54AQI
54AQI
7th June 2025
60AQI
60AQI
8th June 2025
57AQI
57AQI
9th June 2025
48AQI
48AQI
10th June 2025
43AQI
43AQI
11th June 2025
32AQI
32AQI
12th June 2025
26AQI
26AQI
13th June 2025
42AQI
42AQI
14th June 2025
54AQI
54AQI
15th June 2025
49AQI
49AQI
16th June 2025
32AQI
32AQI
17th June 2025
37AQI
37AQI
18th June 2025
56AQI
56AQI
19th June 2025
53AQI
53AQI
20th June 2025
50AQI
50AQI
21st June 2025
32AQI
32AQI
22nd June 2025
37AQI
37AQI
23rd June 2025
44AQI
44AQI
24th June 2025
29AQI
29AQI
25th June 2025
23AQI
23AQI
26th June 2025
26AQI
26AQI
27th June 2025
22AQI
22AQI
28th June 2025
22AQI
22AQI
29th June 2025
23AQI
23AQI
30th June 2025
45AQI
45AQI
1st July 2025
46AQI
46AQI
2nd July 2025
53AQI
53AQI
3rd July 2025
40AQI
40AQI
4th July 2025
47AQI
47AQI
5th July 2025
61AQI
61AQI
6th July 2025
60AQI
60AQI
7th July 2025
54AQI
54AQI
8th July 2025
45AQI
45AQI
9th July 2025
33AQI
33AQI
10th July 2025
42AQI
42AQI
11th July 2025
47AQI
47AQI
12th July 2025
38AQI
38AQI
13th July 2025
30AQI
30AQI
14th July 2025
33AQI
33AQI
15th July 2025
49AQI
49AQI
16th July 2025
60AQI
60AQI
17th July 2025
62AQI
62AQI
18th July 2025
47AQI
47AQI
19th July 2025
44AQI
44AQI
20th July 2025
42AQI
42AQI
21st July 2025
48AQI
48AQI
22nd July 2025
39AQI
39AQI
23rd July 2025
34AQI
34AQI
24th July 2025
27AQI
27AQI
25th July 2025
27AQI
27AQI
26th July 2025
30AQI
30AQI
27th July 2025
36AQI
36AQI
28th July 2025
44AQI
44AQI
29th July 2025
58AQI
58AQI
30th July 2025
54AQI
54AQI
31st July 2025
48AQI
48AQI
1st August 2025
32AQI
32AQI
2nd August 2025
31AQI
31AQI
3rd August 2025
34AQI
34AQI
4th August 2025
30AQI
30AQI
42AQI
45AQI
46AQI
42AQI
44AQI
32AQI
No. of days
Jan.Feb.Mar.Apr.MayJun.Jul.Aug.Sep.Oct.Nov.Dec.Total Days
202544AQI
4
2
20
10
19
12
22
8
23
8
4
92
40
Highest AQI recorded in
May46AQI
Lowest AQI recorded in
August32AQI
Most & Least Polluted Years Over the Last 1 Years
Most Polluted Year Recorded
2025(Avg.)
44AQILeast Polluted Year Recorded
2025(Avg.)
44AQISan Marcos's annual 2025 AQI (44) shows an average percentage change of NaN% (improved AQI) compared to previous years: .
