Signal Hill, 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+
September Air Quality Analysis
Signal Hill, California, United States
2024
2025
AQI
.
Days
AQI Trends: Highest and Lowest
Highest AQI recorded on
8th Sep 2024
72AQILowest AQI recorded on
9th Sep 2025
24AQISame Day Analysis (28th September ):
On this day, AQI across the 2 years varied significantly: 2025 ranks 2nd highest AQI at 28 of Good air quality, showing improvement over 2024 on the same day.
Download 2024 Annual Data
World Air Quality Report
Day & Night AQI Trend: 28th Sep - 29th Sep 2025
Signal Hill, California, United States
AQI
Day
Night
.
6 AM28th Sep 2025
7 PM
5 AM29th Sep 2025
Day time
Avg. Highest Time
3PM28th Sep
47AQI
Avg. Lowest Time
10AM28th Sep
17AQI
Night time
Avg. Highest Time
2AM29th Sep
46AQI
Avg. Lowest Time
11PM28th Sep
30AQI
In the last 24 hours,
Signal Hill's AQI reached its highest point of 47 at 3 PM during the Day, while the lowest point, 17, was recorded at 10 AM during the Day between 28th Sep and 29th Sep 2025.
Day & Night AQI Trend : Aug - Sep 2025
Signal Hill, California, United States
AugSep
30th - 31st31st - 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 - 27th27th - 28th28th - 29th29th
Day
Night
30th Aug 2025526 AMAQI
30th Aug 2025527 AMAQI
30th Aug 2025528 AMAQI
30th Aug 2025539 AMAQI
30th Aug 20255310 AMAQI
30th Aug 20255411 AMAQI
30th Aug 20255412 PMAQI
30th Aug 2025551 PMAQI
30th Aug 2025552 PMAQI
30th Aug 2025553 PMAQI
30th Aug 2025534 PMAQI
30th Aug 2025495 PMAQI
30th Aug 2025446 PMAQI
30th Aug 2025497 PMAQI
30th Aug 2025468 PMAQI
30th Aug 2025439 PMAQI
30th Aug 20254310 PMAQI
30th Aug 20254511 PMAQI
31st Aug 20254812 AMAQI
31st Aug 2025481 AMAQI
31st Aug 2025502 AMAQI
31st Aug 2025533 AMAQI
31st Aug 2025544 AMAQI
31st Aug 2025525 AMAQI
26°C21/33°C
31st Aug 2025526 AMAQI
31st Aug 2025527 AMAQI
31st Aug 2025538 AMAQI
31st Aug 2025509 AMAQI
31st Aug 20255110 AMAQI
31st Aug 20254911 AMAQI
31st Aug 20255312 PMAQI
31st Aug 2025551 PMAQI
31st Aug 2025562 PMAQI
31st Aug 2025593 PMAQI
31st Aug 2025564 PMAQI
31st Aug 2025565 PMAQI
31st Aug 2025536 PMAQI
31st Aug 2025527 PMAQI
31st Aug 2025488 PMAQI
31st Aug 2025449 PMAQI
31st Aug 20254510 PMAQI
31st Aug 20255011 PMAQI
1st Sep 20255312 AMAQI
1st Sep 2025521 AMAQI
1st Sep 2025522 AMAQI
1st Sep 2025513 AMAQI
1st Sep 2025504 AMAQI
1st Sep 2025515 AMAQI
26°C21/32°C
1st Sep 2025496 AMAQI
1st Sep 2025487 AMAQI
1st Sep 2025468 AMAQI
1st Sep 2025469 AMAQI
1st Sep 20254610 AMAQI
1st Sep 20255111 AMAQI
1st Sep 20255512 PMAQI
1st Sep 2025561 PMAQI
1st Sep 2025582 PMAQI
1st Sep 2025573 PMAQI
1st Sep 2025574 PMAQI
1st Sep 2025575 PMAQI
1st Sep 2025556 PMAQI
1st Sep 2025507 PMAQI
1st Sep 2025518 PMAQI
1st Sep 2025519 PMAQI
1st Sep 20254910 PMAQI
1st Sep 20254311 PMAQI
2nd Sep 20254312 AMAQI
2nd Sep 2025451 AMAQI
2nd Sep 2025472 AMAQI
2nd Sep 2025493 AMAQI
2nd Sep 2025484 AMAQI
2nd Sep 2025475 AMAQI
26°C21/33°C
2nd Sep 2025486 AMAQI
2nd Sep 2025517 AMAQI
2nd Sep 2025518 AMAQI
2nd Sep 2025529 AMAQI
2nd Sep 20255210 AMAQI
2nd Sep 20255411 AMAQI
2nd Sep 20255612 PMAQI
2nd Sep 2025581 PMAQI
2nd Sep 2025592 PMAQI
2nd Sep 2025653 PMAQI
2nd Sep 2025624 PMAQI
2nd Sep 2025705 PMAQI
2nd Sep 2025636 PMAQI
2nd Sep 2025527 PMAQI
2nd Sep 2025538 PMAQI
2nd Sep 2025529 PMAQI
2nd Sep 20255110 PMAQI
2nd Sep 20254511 PMAQI
3rd Sep 20254512 AMAQI
3rd Sep 2025471 AMAQI
3rd Sep 2025462 AMAQI
3rd Sep 2025473 AMAQI
3rd Sep 2025464 AMAQI
3rd Sep 2025445 AMAQI
26°C21/34°C
3rd Sep 2025416 AMAQI
3rd Sep 2025407 AMAQI
3rd Sep 2025378 AMAQI
3rd Sep 2025389 AMAQI
3rd Sep 20254010 AMAQI
3rd Sep 20254411 AMAQI
3rd Sep 20254912 PMAQI
3rd Sep 2025521 PMAQI
3rd Sep 2025552 PMAQI
3rd Sep 2025563 PMAQI
3rd Sep 2025534 PMAQI
3rd Sep 2025515 PMAQI
3rd Sep 2025536 PMAQI
3rd Sep 2025487 PMAQI
3rd Sep 2025508 PMAQI
3rd Sep 2025519 PMAQI
3rd Sep 20254910 PMAQI
3rd Sep 20254811 PMAQI
4th Sep 20255312 AMAQI
4th Sep 2025531 AMAQI
4th Sep 2025482 AMAQI
4th Sep 2025393 AMAQI
4th Sep 2025384 AMAQI
4th Sep 2025405 AMAQI
26°C22/32°C
4th Sep 2025426 AMAQI
4th Sep 2025427 AMAQI
4th Sep 2025398 AMAQI
4th Sep 2025409 AMAQI
4th Sep 20254610 AMAQI
4th Sep 20255011 AMAQI
4th Sep 20255212 PMAQI
4th Sep 2025541 PMAQI
4th Sep 2025542 PMAQI
4th Sep 2025553 PMAQI
4th Sep 2025554 PMAQI
4th Sep 2025545 PMAQI
4th Sep 2025546 PMAQI
4th Sep 2025497 PMAQI
4th Sep 2025508 PMAQI
4th Sep 2025499 PMAQI
4th Sep 20254710 PMAQI
4th Sep 20254411 PMAQI
5th Sep 20254412 AMAQI
5th Sep 2025471 AMAQI
5th Sep 2025502 AMAQI
5th Sep 2025493 AMAQI
5th Sep 2025444 AMAQI
5th Sep 2025375 AMAQI
24°C20/32°C
5th Sep 2025396 AMAQI
5th Sep 2025437 AMAQI
5th Sep 2025458 AMAQI
5th Sep 2025499 AMAQI
5th Sep 20255210 AMAQI
5th Sep 20255511 AMAQI
5th Sep 20255712 PMAQI
5th Sep 2025571 PMAQI
5th Sep 2025572 PMAQI
5th Sep 2025583 PMAQI
5th Sep 2025574 PMAQI
5th Sep 2025575 PMAQI
5th Sep 2025566 PMAQI
5th Sep 2025507 PMAQI
5th Sep 2025558 PMAQI
5th Sep 2025539 PMAQI
5th Sep 20254910 PMAQI
5th Sep 20254411 PMAQI
6th Sep 20254012 AMAQI
6th Sep 2025401 AMAQI
6th Sep 2025382 AMAQI
6th Sep 2025383 AMAQI
6th Sep 2025384 AMAQI
6th Sep 2025405 AMAQI
23°C19/31°C
6th Sep 2025416 AMAQI
6th Sep 2025397 AMAQI
6th Sep 2025408 AMAQI
6th Sep 2025409 AMAQI
6th Sep 20253910 AMAQI
6th Sep 20254211 AMAQI
6th Sep 20254812 PMAQI
6th Sep 2025531 PMAQI
6th Sep 2025532 PMAQI
6th Sep 2025533 PMAQI
6th Sep 2025534 PMAQI
6th Sep 2025515 PMAQI
6th Sep 2025526 PMAQI
6th Sep 2025477 PMAQI
6th Sep 2025508 PMAQI
6th Sep 2025499 PMAQI
6th Sep 20254710 PMAQI
6th Sep 20255011 PMAQI
7th Sep 20255012 AMAQI
7th Sep 2025481 AMAQI
7th Sep 2025462 AMAQI
7th Sep 2025453 AMAQI
7th Sep 2025444 AMAQI
7th Sep 2025425 AMAQI
23°C19/30°C
7th Sep 2025426 AMAQI
7th Sep 2025437 AMAQI
7th Sep 2025388 AMAQI
7th Sep 2025349 AMAQI
7th Sep 20253310 AMAQI
7th Sep 20253611 AMAQI
7th Sep 20254612 PMAQI
7th Sep 2025501 PMAQI
7th Sep 2025502 PMAQI
7th Sep 2025523 PMAQI
7th Sep 2025504 PMAQI
7th Sep 2025505 PMAQI
7th Sep 2025456 PMAQI
7th Sep 2025467 PMAQI
7th Sep 2025448 PMAQI
7th Sep 2025419 PMAQI
7th Sep 20253910 PMAQI
7th Sep 20253911 PMAQI
8th Sep 20253712 AMAQI
8th Sep 2025381 AMAQI
8th Sep 2025382 AMAQI
8th Sep 2025383 AMAQI
8th Sep 2025364 AMAQI
8th Sep 2025335 AMAQI
24°C19/31°C
8th Sep 2025306 AMAQI
8th Sep 2025277 AMAQI
8th Sep 2025248 AMAQI
8th Sep 2025259 AMAQI
8th Sep 20252610 AMAQI
8th Sep 20252811 AMAQI
8th Sep 20253112 PMAQI
8th Sep 2025361 PMAQI
8th Sep 2025402 PMAQI
8th Sep 2025403 PMAQI
8th Sep 2025424 PMAQI
8th Sep 2025395 PMAQI
8th Sep 2025346 PMAQI
8th Sep 2025367 PMAQI
8th Sep 2025298 PMAQI
8th Sep 2025219 PMAQI
8th Sep 20251910 PMAQI
8th Sep 20251811 PMAQI
9th Sep 20252012 AMAQI
9th Sep 2025201 AMAQI
9th Sep 2025232 AMAQI
9th Sep 2025223 AMAQI
9th Sep 2025214 AMAQI
9th Sep 2025205 AMAQI
23°C20/29°C
9th Sep 2025206 AMAQI
9th Sep 2025207 AMAQI
9th Sep 2025198 AMAQI
9th Sep 2025199 AMAQI
9th Sep 20251910 AMAQI
9th Sep 20252511 AMAQI
9th Sep 20252912 PMAQI
9th Sep 2025301 PMAQI
9th Sep 2025312 PMAQI
9th Sep 2025323 PMAQI
9th Sep 2025344 PMAQI
9th Sep 2025345 PMAQI
9th Sep 2025296 PMAQI
9th Sep 2025207 PMAQI
9th Sep 2025228 PMAQI
9th Sep 2025259 PMAQI
9th Sep 20252510 PMAQI
9th Sep 20252811 PMAQI
10th Sep 20253012 AMAQI
10th Sep 2025301 AMAQI
10th Sep 2025302 AMAQI
10th Sep 2025283 AMAQI
10th Sep 2025254 AMAQI
10th Sep 2025225 AMAQI
22°C19/28°C
10th Sep 2025246 AMAQI
10th Sep 2025217 AMAQI
10th Sep 2025198 AMAQI
10th Sep 2025229 AMAQI
10th Sep 20252710 AMAQI
10th Sep 20253011 AMAQI
10th Sep 20253212 PMAQI
10th Sep 2025321 PMAQI
10th Sep 2025322 PMAQI
10th Sep 2025273 PMAQI
10th Sep 2025244 PMAQI
10th Sep 2025235 PMAQI
10th Sep 2025226 PMAQI
10th Sep 2025237 PMAQI
10th Sep 2025238 PMAQI
10th Sep 2025269 PMAQI
10th Sep 20252710 PMAQI
10th Sep 20252811 PMAQI
11th Sep 20252712 AMAQI
11th Sep 2025271 AMAQI
11th Sep 2025292 AMAQI
11th Sep 2025263 AMAQI
11th Sep 2025244 AMAQI
11th Sep 2025225 AMAQI
23°C19/29°C
11th Sep 2025196 AMAQI
11th Sep 2025197 AMAQI
11th Sep 2025208 AMAQI
11th Sep 2025219 AMAQI
11th Sep 20252110 AMAQI
11th Sep 20252311 AMAQI
11th Sep 20252612 PMAQI
11th Sep 2025251 PMAQI
11th Sep 2025282 PMAQI
11th Sep 2025243 PMAQI
11th Sep 2025214 PMAQI
11th Sep 2025225 PMAQI
11th Sep 2025236 PMAQI
11th Sep 2025237 PMAQI
11th Sep 2025228 PMAQI
11th Sep 2025229 PMAQI
11th Sep 20252210 PMAQI
11th Sep 20252511 PMAQI
12th Sep 20252912 AMAQI
12th Sep 2025381 AMAQI
12th Sep 2025382 AMAQI
12th Sep 2025283 AMAQI
12th Sep 2025304 AMAQI
12th Sep 2025295 AMAQI
22°C19/27°C
12th Sep 2025326 AMAQI
12th Sep 2025327 AMAQI
12th Sep 2025288 AMAQI
12th Sep 2025279 AMAQI
12th Sep 20252810 AMAQI
12th Sep 20253211 AMAQI
12th Sep 20253112 PMAQI
12th Sep 2025341 PMAQI
12th Sep 2025312 PMAQI
12th Sep 2025273 PMAQI
12th Sep 2025284 PMAQI
12th Sep 2025295 PMAQI
12th Sep 2025346 PMAQI
12th Sep 2025287 PMAQI
12th Sep 2025298 PMAQI
12th Sep 2025359 PMAQI
12th Sep 20253710 PMAQI
12th Sep 20253411 PMAQI
13th Sep 20253412 AMAQI
13th Sep 2025341 AMAQI
13th Sep 2025342 AMAQI
13th Sep 2025333 AMAQI
13th Sep 2025364 AMAQI
13th Sep 2025345 AMAQI
22°C19/26°C
13th Sep 2025346 AMAQI
13th Sep 2025317 AMAQI
13th Sep 2025328 AMAQI
13th Sep 2025309 AMAQI
13th Sep 20253310 AMAQI
13th Sep 20253611 AMAQI
13th Sep 20253812 PMAQI
13th Sep 2025421 PMAQI
13th Sep 2025452 PMAQI
13th Sep 2025443 PMAQI
13th Sep 2025444 PMAQI
13th Sep 2025445 PMAQI
13th Sep 2025436 PMAQI
13th Sep 2025377 PMAQI
13th Sep 2025428 PMAQI
13th Sep 2025469 PMAQI
13th Sep 20254610 PMAQI
13th Sep 20254511 PMAQI
14th Sep 20254212 AMAQI
14th Sep 2025421 AMAQI
14th Sep 2025442 AMAQI
14th Sep 2025483 AMAQI
14th Sep 2025524 AMAQI
14th Sep 2025555 AMAQI
22°C19/28°C
14th Sep 2025466 AMAQI
14th Sep 2025447 AMAQI
14th Sep 2025518 AMAQI
14th Sep 2025519 AMAQI
14th Sep 20255210 AMAQI
14th Sep 20255211 AMAQI
14th Sep 20255312 PMAQI
14th Sep 2025521 PMAQI
14th Sep 2025522 PMAQI
14th Sep 2025543 PMAQI
14th Sep 2025574 PMAQI
14th Sep 2025555 PMAQI
14th Sep 2025556 PMAQI
14th Sep 2025527 PMAQI
14th Sep 2025548 PMAQI
14th Sep 2025569 PMAQI
14th Sep 20255610 PMAQI
14th Sep 20255411 PMAQI
15th Sep 20255112 AMAQI
15th Sep 2025511 AMAQI
15th Sep 2025522 AMAQI
15th Sep 2025513 AMAQI
15th Sep 2025544 AMAQI
15th Sep 2025525 AMAQI
23°C19/30°C
15th Sep 2025546 AMAQI
15th Sep 2025517 AMAQI
15th Sep 2025458 AMAQI
15th Sep 2025649 AMAQI
15th Sep 20255510 AMAQI
15th Sep 20255711 AMAQI
15th Sep 20255712 PMAQI
15th Sep 2025581 PMAQI
15th Sep 2025602 PMAQI
15th Sep 2025603 PMAQI
15th Sep 2025604 PMAQI
15th Sep 2025585 PMAQI
15th Sep 2025596 PMAQI
15th Sep 2025567 PMAQI
15th Sep 2025558 PMAQI
15th Sep 2025589 PMAQI
15th Sep 20255910 PMAQI
15th Sep 20255811 PMAQI
16th Sep 20255812 AMAQI
16th Sep 2025581 AMAQI
16th Sep 2025582 AMAQI
16th Sep 2025603 AMAQI
16th Sep 2025604 AMAQI
16th Sep 2025625 AMAQI
24°C19/29°C
16th Sep 2025636 AMAQI
16th Sep 2025627 AMAQI
16th Sep 2025648 AMAQI
16th Sep 2025639 AMAQI
16th Sep 20256510 AMAQI
16th Sep 20257111 AMAQI
16th Sep 20256912 PMAQI
16th Sep 2025671 PMAQI
16th Sep 2025702 PMAQI
16th Sep 2025703 PMAQI
16th Sep 2025584 PMAQI
16th Sep 2025575 PMAQI
16th Sep 2025606 PMAQI
16th Sep 2025587 PMAQI
16th Sep 2025588 PMAQI
16th Sep 2025519 PMAQI
16th Sep 20255410 PMAQI
16th Sep 20254911 PMAQI
17th Sep 20254912 AMAQI
17th Sep 2025441 AMAQI
17th Sep 2025422 AMAQI
17th Sep 2025403 AMAQI
17th Sep 2025394 AMAQI
17th Sep 2025415 AMAQI
25°C20/36°C
17th Sep 2025386 AMAQI
17th Sep 2025337 AMAQI
17th Sep 2025368 AMAQI
17th Sep 2025429 AMAQI
17th Sep 20254110 AMAQI
17th Sep 20254011 AMAQI
17th Sep 20254212 PMAQI
17th Sep 2025451 PMAQI
17th Sep 2025432 PMAQI
17th Sep 2025413 PMAQI
17th Sep 2025374 PMAQI
17th Sep 2025345 PMAQI
17th Sep 2025376 PMAQI
17th Sep 2025387 PMAQI
17th Sep 2025378 PMAQI
17th Sep 2025409 PMAQI
17th Sep 20253810 PMAQI
17th Sep 20253911 PMAQI
18th Sep 20254012 AMAQI
18th Sep 2025401 AMAQI
18th Sep 2025472 AMAQI
18th Sep 2025543 AMAQI
18th Sep 2025524 AMAQI
18th Sep 2025515 AMAQI
24°C22/28°C
18th Sep 2025486 AMAQI
18th Sep 2025457 AMAQI
18th Sep 2025428 AMAQI
18th Sep 2025459 AMAQI
18th Sep 20254410 AMAQI
18th Sep 20254411 AMAQI
18th Sep 20254612 PMAQI
18th Sep 2025481 PMAQI
18th Sep 2025462 PMAQI
18th Sep 2025483 PMAQI
18th Sep 2025474 PMAQI
18th Sep 2025475 PMAQI
18th Sep 2025476 PMAQI
18th Sep 2025467 PMAQI
18th Sep 2025468 PMAQI
18th Sep 2025459 PMAQI
18th Sep 20254410 PMAQI
18th Sep 20254411 PMAQI
19th Sep 20254312 AMAQI
19th Sep 2025411 AMAQI
19th Sep 2025402 AMAQI
19th Sep 2025393 AMAQI
19th Sep 2025414 AMAQI
19th Sep 2025485 AMAQI
24°C21/29°C
19th Sep 2025576 AMAQI
19th Sep 2025537 AMAQI
19th Sep 2025498 AMAQI
19th Sep 2025489 AMAQI
19th Sep 20255610 AMAQI
19th Sep 20255211 AMAQI
19th Sep 20255212 PMAQI
19th Sep 2025521 PMAQI
19th Sep 2025492 PMAQI
19th Sep 2025463 PMAQI
19th Sep 2025454 PMAQI
19th Sep 2025435 PMAQI
19th Sep 2025396 PMAQI
19th Sep 2025457 PMAQI
19th Sep 2025438 PMAQI
19th Sep 2025379 PMAQI
19th Sep 20253710 PMAQI
19th Sep 20253711 PMAQI
20th Sep 20253912 AMAQI
20th Sep 2025401 AMAQI
20th Sep 2025422 AMAQI
20th Sep 2025463 AMAQI
20th Sep 2025424 AMAQI
20th Sep 2025425 AMAQI
24°C21/28°C
20th Sep 2025396 AMAQI
20th Sep 2025397 AMAQI
20th Sep 2025408 AMAQI
20th Sep 2025409 AMAQI
20th Sep 20254410 AMAQI
20th Sep 20255111 AMAQI
20th Sep 20255112 PMAQI
20th Sep 2025531 PMAQI
20th Sep 2025532 PMAQI
20th Sep 2025503 PMAQI
20th Sep 2025504 PMAQI
20th Sep 2025505 PMAQI
20th Sep 2025486 PMAQI
20th Sep 2025437 PMAQI
20th Sep 2025438 PMAQI
20th Sep 2025439 PMAQI
20th Sep 20254610 PMAQI
20th Sep 20254611 PMAQI
21st Sep 20254812 AMAQI
21st Sep 2025451 AMAQI
21st Sep 2025452 AMAQI
21st Sep 2025433 AMAQI
21st Sep 2025424 AMAQI
21st Sep 2025445 AMAQI
22°C18/28°C
21st Sep 2025446 AMAQI
21st Sep 2025447 AMAQI
21st Sep 2025488 AMAQI
21st Sep 2025479 AMAQI
21st Sep 20254910 AMAQI
21st Sep 20254911 AMAQI
21st Sep 20255012 PMAQI
21st Sep 2025491 PMAQI
21st Sep 2025492 PMAQI
21st Sep 2025493 PMAQI
21st Sep 2025444 PMAQI
21st Sep 2025415 PMAQI
21st Sep 2025426 PMAQI
21st Sep 2025457 PMAQI
21st Sep 2025468 PMAQI
21st Sep 2025439 PMAQI
21st Sep 20254310 PMAQI
21st Sep 20254411 PMAQI
22nd Sep 20254312 AMAQI
22nd Sep 2025421 AMAQI
22nd Sep 2025452 AMAQI
22nd Sep 2025443 AMAQI
22nd Sep 2025444 AMAQI
22nd Sep 2025465 AMAQI
23°C19/31°C
22nd Sep 2025466 AMAQI
22nd Sep 2025477 AMAQI
22nd Sep 2025488 AMAQI
22nd Sep 2025529 AMAQI
22nd Sep 20255310 AMAQI
22nd Sep 20255411 AMAQI
22nd Sep 20255112 PMAQI
22nd Sep 2025521 PMAQI
22nd Sep 2025522 PMAQI
22nd Sep 2025473 PMAQI
22nd Sep 2025484 PMAQI
22nd Sep 2025455 PMAQI
22nd Sep 2025406 PMAQI
22nd Sep 2025427 PMAQI
22nd Sep 2025408 PMAQI
22nd Sep 2025329 PMAQI
22nd Sep 20253110 PMAQI
22nd Sep 20253311 PMAQI
23rd Sep 20253512 AMAQI
23rd Sep 2025351 AMAQI
23rd Sep 2025352 AMAQI
23rd Sep 2025343 AMAQI
23rd Sep 2025334 AMAQI
23rd Sep 2025345 AMAQI
24°C19/33°C
23rd Sep 2025396 AMAQI
23rd Sep 2025467 AMAQI
23rd Sep 2025508 AMAQI
23rd Sep 2025509 AMAQI
23rd Sep 20255110 AMAQI
23rd Sep 20255211 AMAQI
23rd Sep 20255912 PMAQI
23rd Sep 2025531 PMAQI
23rd Sep 2025542 PMAQI
23rd Sep 2025533 PMAQI
23rd Sep 2025494 PMAQI
23rd Sep 2025465 PMAQI
23rd Sep 2025426 PMAQI
23rd Sep 2025417 PMAQI
23rd Sep 2025398 PMAQI
23rd Sep 2025389 PMAQI
23rd Sep 20253910 PMAQI
23rd Sep 20253911 PMAQI
24th Sep 20253912 AMAQI
24th Sep 2025411 AMAQI
24th Sep 2025462 AMAQI
24th Sep 2025463 AMAQI
24th Sep 2025464 AMAQI
24th Sep 2025445 AMAQI
24°C18/35°C
24th Sep 2025416 AMAQI
24th Sep 2025407 AMAQI
24th Sep 2025418 AMAQI
24th Sep 2025449 AMAQI
24th Sep 20255010 AMAQI
24th Sep 20255211 AMAQI
24th Sep 20255112 PMAQI
24th Sep 2025521 PMAQI
24th Sep 2025522 PMAQI
24th Sep 2025523 PMAQI
24th Sep 2025494 PMAQI
24th Sep 2025475 PMAQI
24th Sep 2025426 PMAQI
24th Sep 2025437 PMAQI
24th Sep 2025428 PMAQI
24th Sep 2025429 PMAQI
24th Sep 20254310 PMAQI
24th Sep 20254411 PMAQI
25th Sep 20254212 AMAQI
25th Sep 2025441 AMAQI
25th Sep 2025372 AMAQI
25th Sep 2025353 AMAQI
25th Sep 2025374 AMAQI
25th Sep 2025365 AMAQI
24°C20/33°C
25th Sep 2025346 AMAQI
25th Sep 2025337 AMAQI
25th Sep 2025348 AMAQI
25th Sep 2025429 AMAQI
25th Sep 20255110 AMAQI
25th Sep 20255411 AMAQI
25th Sep 20255712 PMAQI
25th Sep 2025581 PMAQI
25th Sep 2025572 PMAQI
25th Sep 2025543 PMAQI
25th Sep 2025534 PMAQI
25th Sep 2025525 PMAQI
25th Sep 2025456 PMAQI
25th Sep 2025447 PMAQI
25th Sep 2025338 PMAQI
25th Sep 2025279 PMAQI
25th Sep 20252610 PMAQI
25th Sep 20252511 PMAQI
26th Sep 20252512 AMAQI
26th Sep 2025241 AMAQI
26th Sep 2025252 AMAQI
26th Sep 2025343 AMAQI
26th Sep 2025414 AMAQI
26th Sep 2025425 AMAQI
21°C19/26°C
26th Sep 2025416 AMAQI
26th Sep 2025307 AMAQI
26th Sep 2025288 AMAQI
26th Sep 2025259 AMAQI
26th Sep 20251810 AMAQI
26th Sep 20251811 AMAQI
26th Sep 20251912 PMAQI
26th Sep 2025191 PMAQI
26th Sep 2025202 PMAQI
26th Sep 2025233 PMAQI
26th Sep 2025254 PMAQI
26th Sep 2025285 PMAQI
26th Sep 2025286 PMAQI
26th Sep 2025287 PMAQI
26th Sep 2025288 PMAQI
26th Sep 2025279 PMAQI
26th Sep 20252610 PMAQI
26th Sep 20252811 PMAQI
27th Sep 20252812 AMAQI
27th Sep 2025241 AMAQI
27th Sep 2025182 AMAQI
27th Sep 2025213 AMAQI
27th Sep 2025244 AMAQI
27th Sep 2025265 AMAQI
20°C18/23°C
27th Sep 2025236 AMAQI
27th Sep 2025227 AMAQI
27th Sep 2025158 AMAQI
27th Sep 2025159 AMAQI
27th Sep 20251710 AMAQI
27th Sep 20251711 AMAQI
27th Sep 20251812 PMAQI
27th Sep 2025201 PMAQI
27th Sep 2025162 PMAQI
27th Sep 2025143 PMAQI
27th Sep 2025174 PMAQI
27th Sep 2025175 PMAQI
27th Sep 2025236 PMAQI
27th Sep 2025327 PMAQI
27th Sep 2025328 PMAQI
27th Sep 2025349 PMAQI
27th Sep 20253710 PMAQI
27th Sep 20252711 PMAQI
28th Sep 20251712 AMAQI
28th Sep 2025171 AMAQI
28th Sep 2025182 AMAQI
28th Sep 2025143 AMAQI
28th Sep 2025204 AMAQI
28th Sep 2025245 AMAQI
21°C19/25°C
28th Sep 2025226 AMAQI
28th Sep 2025257 AMAQI
28th Sep 2025288 AMAQI
28th Sep 2025249 AMAQI
28th Sep 20251710 AMAQI
28th Sep 20252311 AMAQI
28th Sep 20253912 PMAQI
28th Sep 2025461 PMAQI
28th Sep 2025452 PMAQI
28th Sep 2025473 PMAQI
28th Sep 2025454 PMAQI
28th Sep 2025425 PMAQI
28th Sep 2025436 PMAQI
28th Sep 2025427 PMAQI
28th Sep 2025428 PMAQI
28th Sep 2025399 PMAQI
28th Sep 20253410 PMAQI
28th Sep 20253011 PMAQI
29th Sep 20254112 AMAQI
29th Sep 2025451 AMAQI
29th Sep 2025462 AMAQI
29th Sep 2025423 AMAQI
29th Sep 2025334 AMAQI
29th Sep 2025315 AMAQI
22°C17/28°C
29th Sep 2025276 AMAQI
6 AM29th Sep 2025277 AMAQI
29th Sep 2025278 AMAQI
29th Sep 2025269 AMAQI
29th Sep 20253610 AMAQI
29th Sep 20253711 AMAQI
29th Sep 20254412 PMAQI
12 PM29th Sep 2025451 PMAQI
7 PM
12 AM
5 AM
--°C/°C
Day time
Avg. Highest Time
12 PM - 6 PM
46AQI
7 hours / Day
210 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 12 PM to 6 PM (Avg. 46), while the lowest AQI was between 6 AM to 9 AM (Avg. 39).
Night time
Avg. Highest Time
8 PM - 11 PM
41AQI
4 hours / Day
120 hours / Month
Avg. Lowest Time
12 AM - 11 PM
40AQI
10 hours / Day
300 hours / Month
In the last 30 days, during the daytime, the highest AQI was between 8 PM to 11 PM (Avg. 41), while the lowest AQI was between 12 AM to 11 PM (Avg. 40).
2025 Days Vs Air Quality
Signal Hill, California, United States
2025
72%
195
28%
75
0.3%
1
Total number of days with different AQI categories in last 272 days in 2025 (93 days remaining)
Good
195 DaysModerate
75 DaysPoor
1 DaysUnhealthy
0 DaysSevere
0 DaysHazardous
0 DaysUnder WHO’s Safe Air Quality Limits: 72%
Health Risk Level:
Low
In 2025, 72% of 272 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
Signal Hill, 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
122AQI
122AQI
2nd January 2025
97AQI
97AQI
3rd January 2025
73AQI
73AQI
4th January 2025
72AQI
72AQI
5th January 2025
65AQI
65AQI
6th January 2025
60AQI
60AQI
7th January 2025
57AQI
57AQI
8th January 2025
75AQI
75AQI
9th January 2025
87AQI
87AQI
10th January 2025
72AQI
72AQI
11th January 2025
63AQI
63AQI
12th January 2025
50AQI
50AQI
13th January 2025
45AQI
45AQI
14th January 2025
46AQI
46AQI
15th January 2025
48AQI
48AQI
16th January 2025
49AQI
49AQI
17th January 2025
51AQI
51AQI
18th January 2025
56AQI
56AQI
19th January 2025
71AQI
71AQI
20th January 2025
61AQI
61AQI
21st January 2025
43AQI
43AQI
22nd January 2025
52AQI
52AQI
23rd January 2025
53AQI
53AQI
24th January 2025
46AQI
46AQI
25th January 2025
60AQI
60AQI
26th January 2025
46AQI
46AQI
27th January 2025
44AQI
44AQI
28th January 2025
46AQI
46AQI
29th January 2025
51AQI
51AQI
30th January 2025
54AQI
54AQI
31st January 2025
66AQI
66AQI
1st February 2025
68AQI
68AQI
2nd February 2025
73AQI
73AQI
3rd February 2025
64AQI
64AQI
4th February 2025
43AQI
43AQI
5th February 2025
32AQI
32AQI
6th February 2025
30AQI
30AQI
7th February 2025
24AQI
24AQI
8th February 2025
31AQI
31AQI
9th February 2025
42AQI
42AQI
10th February 2025
39AQI
39AQI
11th February 2025
32AQI
32AQI
12th February 2025
31AQI
31AQI
13th February 2025
21AQI
21AQI
14th February 2025
22AQI
22AQI
15th February 2025
28AQI
28AQI
16th February 2025
42AQI
42AQI
17th February 2025
50AQI
50AQI
18th February 2025
43AQI
43AQI
19th February 2025
55AQI
55AQI
20th February 2025
53AQI
53AQI
21st February 2025
46AQI
46AQI
22nd February 2025
50AQI
50AQI
23rd February 2025
51AQI
51AQI
24th February 2025
56AQI
56AQI
25th February 2025
48AQI
48AQI
26th February 2025
53AQI
53AQI
27th February 2025
48AQI
48AQI
28th February 2025
45AQI
45AQI
1st March 2025
32AQI
32AQI
2nd March 2025
31AQI
31AQI
3rd March 2025
29AQI
29AQI
4th March 2025
35AQI
35AQI
5th March 2025
44AQI
44AQI
6th March 2025
22AQI
22AQI
7th March 2025
30AQI
30AQI
8th March 2025
40AQI
40AQI
9th March 2025
41AQI
41AQI
10th March 2025
41AQI
41AQI
11th March 2025
29AQI
29AQI
12th March 2025
26AQI
26AQI
13th March 2025
22AQI
22AQI
14th March 2025
23AQI
23AQI
15th March 2025
33AQI
33AQI
16th March 2025
46AQI
46AQI
17th March 2025
44AQI
44AQI
18th March 2025
28AQI
28AQI
19th March 2025
28AQI
28AQI
20th March 2025
33AQI
33AQI
21st March 2025
42AQI
42AQI
22nd March 2025
40AQI
40AQI
23rd March 2025
44AQI
44AQI
24th March 2025
46AQI
46AQI
25th March 2025
51AQI
51AQI
26th March 2025
35AQI
35AQI
27th March 2025
24AQI
24AQI
28th March 2025
35AQI
35AQI
29th March 2025
40AQI
40AQI
30th March 2025
33AQI
33AQI
31st March 2025
22AQI
22AQI
1st April 2025
29AQI
29AQI
2nd April 2025
33AQI
33AQI
3rd April 2025
37AQI
37AQI
4th April 2025
40AQI
40AQI
5th April 2025
31AQI
31AQI
6th April 2025
34AQI
34AQI
7th April 2025
40AQI
40AQI
8th April 2025
44AQI
44AQI
9th April 2025
51AQI
51AQI
10th April 2025
50AQI
50AQI
11th April 2025
46AQI
46AQI
12th April 2025
49AQI
49AQI
13th April 2025
49AQI
49AQI
14th April 2025
51AQI
51AQI
15th April 2025
45AQI
45AQI
16th April 2025
40AQI
40AQI
17th April 2025
29AQI
29AQI
18th April 2025
33AQI
33AQI
19th April 2025
42AQI
42AQI
20th April 2025
45AQI
45AQI
21st April 2025
51AQI
51AQI
22nd April 2025
51AQI
51AQI
23rd April 2025
43AQI
43AQI
24th April 2025
42AQI
42AQI
25th April 2025
36AQI
36AQI
26th April 2025
21AQI
21AQI
27th April 2025
18AQI
18AQI
28th April 2025
28AQI
28AQI
29th April 2025
42AQI
42AQI
30th April 2025
43AQI
43AQI
1st May 2025
34AQI
34AQI
2nd May 2025
39AQI
39AQI
3rd May 2025
28AQI
28AQI
4th May 2025
36AQI
36AQI
5th May 2025
37AQI
37AQI
6th May 2025
37AQI
37AQI
7th May 2025
42AQI
42AQI
8th May 2025
49AQI
49AQI
9th May 2025
51AQI
51AQI
10th May 2025
46AQI
46AQI
11th May 2025
55AQI
55AQI
12th May 2025
45AQI
45AQI
13th May 2025
25AQI
25AQI
14th May 2025
35AQI
35AQI
15th May 2025
49AQI
49AQI
16th May 2025
51AQI
51AQI
17th May 2025
42AQI
42AQI
18th May 2025
33AQI
33AQI
19th May 2025
44AQI
44AQI
20th May 2025
53AQI
53AQI
21st May 2025
52AQI
52AQI
22nd May 2025
53AQI
53AQI
23rd May 2025
53AQI
53AQI
24th May 2025
52AQI
52AQI
25th May 2025
47AQI
47AQI
26th May 2025
47AQI
47AQI
27th May 2025
43AQI
43AQI
28th May 2025
44AQI
44AQI
29th May 2025
36AQI
36AQI
30th May 2025
42AQI
42AQI
31st May 2025
46AQI
46AQI
1st June 2025
45AQI
45AQI
2nd June 2025
34AQI
34AQI
3rd June 2025
30AQI
30AQI
4th June 2025
31AQI
31AQI
5th June 2025
26AQI
26AQI
6th June 2025
28AQI
28AQI
7th June 2025
32AQI
32AQI
8th June 2025
31AQI
31AQI
9th June 2025
33AQI
33AQI
10th June 2025
37AQI
37AQI
11th June 2025
44AQI
44AQI
12th June 2025
41AQI
41AQI
13th June 2025
49AQI
49AQI
14th June 2025
51AQI
51AQI
15th June 2025
53AQI
53AQI
16th June 2025
57AQI
57AQI
17th June 2025
58AQI
58AQI
18th June 2025
57AQI
57AQI
19th June 2025
54AQI
54AQI
20th June 2025
53AQI
53AQI
21st June 2025
54AQI
54AQI
22nd June 2025
53AQI
53AQI
23rd June 2025
54AQI
54AQI
24th June 2025
51AQI
51AQI
25th June 2025
47AQI
47AQI
26th June 2025
47AQI
47AQI
27th June 2025
50AQI
50AQI
28th June 2025
49AQI
49AQI
29th June 2025
45AQI
45AQI
30th June 2025
37AQI
37AQI
1st July 2025
41AQI
41AQI
2nd July 2025
41AQI
41AQI
3rd July 2025
37AQI
37AQI
4th July 2025
41AQI
41AQI
5th July 2025
80AQI
80AQI
6th July 2025
59AQI
59AQI
7th July 2025
55AQI
55AQI
8th July 2025
42AQI
42AQI
9th July 2025
38AQI
38AQI
10th July 2025
44AQI
44AQI
11th July 2025
46AQI
46AQI
12th July 2025
46AQI
46AQI
13th July 2025
43AQI
43AQI
14th July 2025
37AQI
37AQI
15th July 2025
28AQI
28AQI
16th July 2025
23AQI
23AQI
17th July 2025
25AQI
25AQI
18th July 2025
28AQI
28AQI
19th July 2025
37AQI
37AQI
20th July 2025
38AQI
38AQI
21st July 2025
35AQI
35AQI
22nd July 2025
26AQI
26AQI
23rd July 2025
29AQI
29AQI
24th July 2025
26AQI
26AQI
25th July 2025
23AQI
23AQI
26th July 2025
25AQI
25AQI
27th July 2025
28AQI
28AQI
28th July 2025
29AQI
29AQI
29th July 2025
36AQI
36AQI
30th July 2025
44AQI
44AQI
31st July 2025
48AQI
48AQI
1st August 2025
48AQI
48AQI
2nd August 2025
47AQI
47AQI
3rd August 2025
49AQI
49AQI
4th August 2025
56AQI
56AQI
5th August 2025
62AQI
62AQI
6th August 2025
63AQI
63AQI
7th August 2025
56AQI
56AQI
8th August 2025
48AQI
48AQI
9th August 2025
53AQI
53AQI
10th August 2025
50AQI
50AQI
11th August 2025
50AQI
50AQI
12th August 2025
51AQI
51AQI
13th August 2025
54AQI
54AQI
14th August 2025
52AQI
52AQI
15th August 2025
46AQI
46AQI
16th August 2025
33AQI
33AQI
17th August 2025
39AQI
39AQI
18th August 2025
44AQI
44AQI
19th August 2025
47AQI
47AQI
20th August 2025
49AQI
49AQI
21st August 2025
53AQI
53AQI
22nd August 2025
59AQI
59AQI
23rd August 2025
54AQI
54AQI
24th August 2025
50AQI
50AQI
25th August 2025
51AQI
51AQI
26th August 2025
50AQI
50AQI
27th August 2025
52AQI
52AQI
28th August 2025
52AQI
52AQI
29th August 2025
49AQI
49AQI
30th August 2025
49AQI
49AQI
31st August 2025
51AQI
51AQI
1st September 2025
51AQI
51AQI
2nd September 2025
52AQI
52AQI
3rd September 2025
47AQI
47AQI
4th September 2025
46AQI
46AQI
5th September 2025
50AQI
50AQI
6th September 2025
45AQI
45AQI
7th September 2025
44AQI
44AQI
8th September 2025
32AQI
32AQI
9th September 2025
24AQI
24AQI
10th September 2025
26AQI
26AQI
11th September 2025
24AQI
24AQI
12th September 2025
32AQI
32AQI
13th September 2025
38AQI
38AQI
14th September 2025
51AQI
51AQI
15th September 2025
55AQI
55AQI
16th September 2025
60AQI
60AQI
17th September 2025
40AQI
40AQI
18th September 2025
46AQI
46AQI
19th September 2025
45AQI
45AQI
20th September 2025
45AQI
45AQI
21st September 2025
45AQI
45AQI
22nd September 2025
44AQI
44AQI
23rd September 2025
42AQI
42AQI
24th September 2025
45AQI
45AQI
25th September 2025
41AQI
41AQI
26th September 2025
28AQI
28AQI
27th September 2025
24AQI
24AQI
28th September 2025
28AQI
28AQI
29th September 2025
30th September 2025
1st October 2025
2nd October 2025
3rd October 2025
4th October 2025
5th October 2025
6th October 2025
7th October 2025
8th October 2025
9th October 2025
10th October 2025
11th October 2025
12th October 2025
13th October 2025
14th October 2025
15th October 2025
16th October 2025
17th October 2025
18th October 2025
19th October 2025
20th October 2025
21st October 2025
22nd October 2025
23rd October 2025
24th October 2025
25th October 2025
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
61AQI
44AQI
34AQI
40AQI
43AQI
44AQI
38AQI
51AQI
41AQI
No. of days
Jan.Feb.Mar.Apr.MayJun.Jul.Aug.Sep.Oct.Nov.Dec.Total Days
202544AQI
10
20
1
20
8
30
1
26
4
23
8
19
11
28
3
16
15
23
5
195
75
1
Highest AQI recorded in
January61AQI
Lowest AQI recorded in
March34AQI
202450AQI
9
7
11
1
22
7
25
6
29
2
10
18
14
17
21
9
31
141
98
Highest AQI recorded in
December70AQI
Lowest AQI recorded in
May38AQI
202355AQI
2
1
10
21
12
22
Highest AQI recorded in
December56AQI
Lowest AQI recorded in
November46AQI
202215AQI
3
2
1
6
Highest AQI recorded in
February21AQI
Lowest AQI recorded in
March3AQI
202130AQI
4
2
1
4
2
2
1
1
2
1
1
2
20
2
1
Highest AQI recorded in
November91AQI
Lowest AQI recorded in
March0AQI
202033AQI
1
1
2
4
1
1
8
1
1
Highest AQI recorded in
July129AQI
Lowest AQI recorded in
September2AQI
Most & Least Polluted Years Over the Last 6 Years
Most Polluted Year Recorded
2023(Avg.)
55AQILeast Polluted Year Recorded
2022(Avg.)
15AQISignal Hill's annual 2025 AQI (44) shows an average percentage change of 50.6% (worsened AQI) compared to previous years: 2020 (33), 2021 (30), 2022 (15), 2023 (55), 2024 (50).
