Longmont, Colorado, 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
Longmont, Colorado, United States
2021
2022
2023
2024
2025
AQI
.
Days
AQI Trends: Highest and Lowest
Highest AQI recorded on
8th Aug 2021
134AQILowest AQI recorded on
25th Aug 2024
15AQISame Day Analysis (6th August ):
On this day, AQI across the 5 years varied significantly: 2025 ranks 1st highest AQI at 94 of Moderate air quality on the same day.
Download 2024 Annual Data
World Air Quality Report
Day & Night AQI Trend: 6th Aug - 7th Aug 2025
Longmont, Colorado, United States
AQI
Day
Night
.
5 AM6th Aug 2025
8 PM
4 AM7th Aug 2025
Day time
Avg. Highest Time
6AM6th Aug
126AQI
Avg. Lowest Time
6PM6th Aug
63AQI
Night time
Avg. Highest Time
5AM6th Aug
116AQI
Avg. Lowest Time
10PM6th Aug
55AQI
In the last 24 hours,
Longmont's AQI reached its highest point of 126 at 6 AM during the Day, while the lowest point, 55, was recorded at 10 PM during the Night between 6th Aug and 7th Aug 2025.
Day & Night AQI Trend : Jul - Aug 2025
Longmont, Colorado, United States
JulAug
08th - 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 - 07th07th
Day
Night
8th Jul 2025365 AMAQI
8th Jul 2025316 AMAQI
8th Jul 2025327 AMAQI
8th Jul 2025328 AMAQI
8th Jul 2025339 AMAQI
8th Jul 20253310 AMAQI
8th Jul 20253411 AMAQI
8th Jul 20253612 PMAQI
8th Jul 2025361 PMAQI
8th Jul 2025372 PMAQI
8th Jul 2025353 PMAQI
8th Jul 2025344 PMAQI
8th Jul 2025325 PMAQI
8th Jul 2025326 PMAQI
8th Jul 2025327 PMAQI
8th Jul 2025328 PMAQI
8th Jul 2025319 PMAQI
8th Jul 20253010 PMAQI
8th Jul 20253211 PMAQI
9th Jul 20253212 AMAQI
9th Jul 2025341 AMAQI
9th Jul 2025322 AMAQI
9th Jul 2025323 AMAQI
9th Jul 2025334 AMAQI
25°C14/34°C
9th Jul 2025305 AMAQI
9th Jul 2025306 AMAQI
9th Jul 2025307 AMAQI
9th Jul 2025328 AMAQI
9th Jul 2025359 AMAQI
9th Jul 20254010 AMAQI
9th Jul 20253711 AMAQI
9th Jul 20253612 PMAQI
9th Jul 2025361 PMAQI
9th Jul 2025352 PMAQI
9th Jul 2025313 PMAQI
9th Jul 2025294 PMAQI
9th Jul 2025285 PMAQI
9th Jul 2025276 PMAQI
9th Jul 2025307 PMAQI
9th Jul 2025318 PMAQI
9th Jul 2025309 PMAQI
9th Jul 20253510 PMAQI
9th Jul 20253511 PMAQI
10th Jul 20253512 AMAQI
10th Jul 2025331 AMAQI
10th Jul 2025332 AMAQI
10th Jul 2025313 AMAQI
10th Jul 2025324 AMAQI
27°C15/39°C
10th Jul 2025325 AMAQI
10th Jul 2025226 AMAQI
10th Jul 2025227 AMAQI
10th Jul 2025258 AMAQI
10th Jul 2025329 AMAQI
10th Jul 20253410 AMAQI
10th Jul 20253411 AMAQI
10th Jul 20252912 PMAQI
10th Jul 2025291 PMAQI
10th Jul 2025322 PMAQI
10th Jul 2025393 PMAQI
10th Jul 2025484 PMAQI
10th Jul 2025395 PMAQI
10th Jul 2025436 PMAQI
10th Jul 2025367 PMAQI
10th Jul 2025348 PMAQI
10th Jul 2025469 PMAQI
10th Jul 20254210 PMAQI
10th Jul 20253811 PMAQI
11th Jul 20253612 AMAQI
11th Jul 2025351 AMAQI
11th Jul 2025352 AMAQI
11th Jul 2025383 AMAQI
11th Jul 2025374 AMAQI
25°C17/34°C
11th Jul 2025365 AMAQI
11th Jul 2025366 AMAQI
11th Jul 2025377 AMAQI
11th Jul 2025368 AMAQI
11th Jul 2025389 AMAQI
11th Jul 20253810 AMAQI
11th Jul 20253711 AMAQI
11th Jul 20253612 PMAQI
11th Jul 2025381 PMAQI
11th Jul 2025392 PMAQI
11th Jul 2025383 PMAQI
11th Jul 2025374 PMAQI
11th Jul 2025375 PMAQI
11th Jul 2025376 PMAQI
11th Jul 2025367 PMAQI
11th Jul 2025398 PMAQI
11th Jul 2025449 PMAQI
11th Jul 20255010 PMAQI
11th Jul 20255411 PMAQI
12th Jul 20255712 AMAQI
12th Jul 2025581 AMAQI
12th Jul 2025542 AMAQI
12th Jul 2025523 AMAQI
12th Jul 2025534 AMAQI
22°C15/32°C
12th Jul 2025665 AMAQI
12th Jul 2025606 AMAQI
12th Jul 2025607 AMAQI
12th Jul 2025608 AMAQI
12th Jul 2025599 AMAQI
12th Jul 20256010 AMAQI
12th Jul 20256011 AMAQI
12th Jul 20256112 PMAQI
12th Jul 2025601 PMAQI
12th Jul 2025602 PMAQI
12th Jul 2025593 PMAQI
12th Jul 2025604 PMAQI
12th Jul 2025595 PMAQI
12th Jul 2025586 PMAQI
12th Jul 2025587 PMAQI
12th Jul 2025568 PMAQI
12th Jul 2025549 PMAQI
12th Jul 20255310 PMAQI
12th Jul 20255511 PMAQI
13th Jul 20255512 AMAQI
13th Jul 2025541 AMAQI
13th Jul 2025542 AMAQI
13th Jul 2025533 AMAQI
13th Jul 2025534 AMAQI
21°C14/30°C
13th Jul 2025475 AMAQI
13th Jul 2025486 AMAQI
13th Jul 2025517 AMAQI
13th Jul 2025518 AMAQI
13th Jul 2025509 AMAQI
13th Jul 20254910 AMAQI
13th Jul 20255011 AMAQI
13th Jul 20255012 PMAQI
13th Jul 2025481 PMAQI
13th Jul 2025502 PMAQI
13th Jul 2025493 PMAQI
13th Jul 2025484 PMAQI
13th Jul 2025465 PMAQI
13th Jul 2025456 PMAQI
13th Jul 2025507 PMAQI
13th Jul 2025488 PMAQI
13th Jul 2025449 PMAQI
13th Jul 20254210 PMAQI
13th Jul 20254311 PMAQI
14th Jul 20254512 AMAQI
14th Jul 2025421 AMAQI
14th Jul 2025422 AMAQI
14th Jul 2025413 AMAQI
14th Jul 2025394 AMAQI
25°C16/35°C
14th Jul 2025295 AMAQI
14th Jul 2025246 AMAQI
14th Jul 2025307 AMAQI
14th Jul 2025328 AMAQI
14th Jul 2025369 AMAQI
14th Jul 20254010 AMAQI
14th Jul 20254411 AMAQI
14th Jul 20254212 PMAQI
14th Jul 2025391 PMAQI
14th Jul 2025382 PMAQI
14th Jul 2025393 PMAQI
14th Jul 2025414 PMAQI
14th Jul 2025395 PMAQI
14th Jul 2025396 PMAQI
14th Jul 2025407 PMAQI
14th Jul 2025388 PMAQI
14th Jul 2025339 PMAQI
14th Jul 20253310 PMAQI
14th Jul 20253211 PMAQI
15th Jul 20253412 AMAQI
15th Jul 2025341 AMAQI
15th Jul 2025332 AMAQI
15th Jul 2025333 AMAQI
15th Jul 2025344 AMAQI
25°C17/37°C
15th Jul 2025295 AMAQI
15th Jul 2025276 AMAQI
15th Jul 2025307 AMAQI
15th Jul 2025348 AMAQI
15th Jul 2025369 AMAQI
15th Jul 20254010 AMAQI
15th Jul 20254211 AMAQI
15th Jul 20253812 PMAQI
15th Jul 2025351 PMAQI
15th Jul 2025352 PMAQI
15th Jul 2025363 PMAQI
15th Jul 2025354 PMAQI
15th Jul 2025345 PMAQI
15th Jul 2025356 PMAQI
15th Jul 2025347 PMAQI
15th Jul 2025348 PMAQI
15th Jul 2025369 PMAQI
15th Jul 20253510 PMAQI
15th Jul 20253611 PMAQI
16th Jul 20253612 AMAQI
16th Jul 2025371 AMAQI
16th Jul 2025382 AMAQI
16th Jul 2025393 AMAQI
16th Jul 2025384 AMAQI
26°C14/37°C
16th Jul 2025415 AMAQI
16th Jul 2025406 AMAQI
16th Jul 2025437 AMAQI
16th Jul 2025448 AMAQI
16th Jul 2025459 AMAQI
16th Jul 20254910 AMAQI
16th Jul 20254811 AMAQI
16th Jul 20254812 PMAQI
16th Jul 2025481 PMAQI
16th Jul 2025482 PMAQI
16th Jul 2025493 PMAQI
16th Jul 2025504 PMAQI
16th Jul 2025505 PMAQI
16th Jul 2025516 PMAQI
16th Jul 2025477 PMAQI
16th Jul 2025468 PMAQI
16th Jul 2025509 PMAQI
16th Jul 20254510 PMAQI
16th Jul 20254311 PMAQI
17th Jul 20254012 AMAQI
17th Jul 2025401 AMAQI
17th Jul 2025382 AMAQI
17th Jul 2025383 AMAQI
17th Jul 2025404 AMAQI
20°C13/28°C
17th Jul 2025435 AMAQI
17th Jul 2025456 AMAQI
17th Jul 2025527 AMAQI
17th Jul 2025508 AMAQI
17th Jul 2025509 AMAQI
17th Jul 20255310 AMAQI
17th Jul 20255411 AMAQI
17th Jul 20255512 PMAQI
17th Jul 2025551 PMAQI
17th Jul 2025562 PMAQI
17th Jul 2025563 PMAQI
17th Jul 2025594 PMAQI
17th Jul 2025585 PMAQI
17th Jul 2025596 PMAQI
17th Jul 2025557 PMAQI
17th Jul 2025528 PMAQI
17th Jul 2025549 PMAQI
17th Jul 20255410 PMAQI
17th Jul 20255311 PMAQI
18th Jul 20255312 AMAQI
18th Jul 2025531 AMAQI
18th Jul 2025522 AMAQI
18th Jul 2025513 AMAQI
18th Jul 2025504 AMAQI
20°C14/30°C
18th Jul 2025505 AMAQI
18th Jul 2025486 AMAQI
18th Jul 2025517 AMAQI
18th Jul 2025518 AMAQI
18th Jul 2025539 AMAQI
18th Jul 20255410 AMAQI
18th Jul 20255411 AMAQI
18th Jul 20255412 PMAQI
18th Jul 2025541 PMAQI
18th Jul 2025552 PMAQI
18th Jul 2025543 PMAQI
18th Jul 2025544 PMAQI
18th Jul 2025545 PMAQI
18th Jul 2025536 PMAQI
18th Jul 2025537 PMAQI
18th Jul 2025528 PMAQI
18th Jul 2025509 PMAQI
18th Jul 20255010 PMAQI
18th Jul 20255211 PMAQI
19th Jul 20255212 AMAQI
19th Jul 2025531 AMAQI
19th Jul 2025542 AMAQI
19th Jul 2025543 AMAQI
19th Jul 2025534 AMAQI
25°C15/36°C
19th Jul 2025525 AMAQI
19th Jul 2025486 AMAQI
19th Jul 2025487 AMAQI
19th Jul 2025498 AMAQI
19th Jul 2025489 AMAQI
19th Jul 20254710 AMAQI
19th Jul 20254711 AMAQI
19th Jul 20255012 PMAQI
19th Jul 2025481 PMAQI
19th Jul 2025482 PMAQI
19th Jul 2025503 PMAQI
19th Jul 2025494 PMAQI
19th Jul 2025485 PMAQI
19th Jul 2025486 PMAQI
19th Jul 2025497 PMAQI
19th Jul 2025488 PMAQI
19th Jul 2025479 PMAQI
19th Jul 20254410 PMAQI
19th Jul 20254311 PMAQI
20th Jul 20254312 AMAQI
20th Jul 2025431 AMAQI
20th Jul 2025452 AMAQI
20th Jul 2025463 AMAQI
20th Jul 2025454 AMAQI
24°C15/35°C
20th Jul 2025425 AMAQI
20th Jul 2025416 AMAQI
20th Jul 2025417 AMAQI
20th Jul 2025408 AMAQI
20th Jul 2025429 AMAQI
20th Jul 20253810 AMAQI
20th Jul 20253811 AMAQI
20th Jul 20253712 PMAQI
20th Jul 2025341 PMAQI
20th Jul 2025342 PMAQI
20th Jul 2025383 PMAQI
20th Jul 2025384 PMAQI
20th Jul 2025385 PMAQI
20th Jul 2025386 PMAQI
20th Jul 2025407 PMAQI
20th Jul 2025388 PMAQI
20th Jul 2025359 PMAQI
20th Jul 20253510 PMAQI
20th Jul 20253411 PMAQI
21st Jul 20253612 AMAQI
21st Jul 2025351 AMAQI
21st Jul 2025332 AMAQI
21st Jul 2025343 AMAQI
21st Jul 2025354 AMAQI
25°C15/36°C
21st Jul 2025305 AMAQI
21st Jul 2025286 AMAQI
21st Jul 2025327 AMAQI
21st Jul 2025348 AMAQI
21st Jul 2025369 AMAQI
21st Jul 20253810 AMAQI
21st Jul 20253911 AMAQI
21st Jul 20254012 PMAQI
21st Jul 2025401 PMAQI
21st Jul 2025382 PMAQI
21st Jul 2025373 PMAQI
21st Jul 2025344 PMAQI
21st Jul 2025345 PMAQI
21st Jul 2025346 PMAQI
21st Jul 2025347 PMAQI
21st Jul 2025338 PMAQI
21st Jul 2025339 PMAQI
21st Jul 20253510 PMAQI
21st Jul 20253511 PMAQI
22nd Jul 20253612 AMAQI
22nd Jul 2025351 AMAQI
22nd Jul 2025362 AMAQI
22nd Jul 2025363 AMAQI
22nd Jul 2025364 AMAQI
25°C16/37°C
22nd Jul 2025395 AMAQI
22nd Jul 2025376 AMAQI
22nd Jul 2025357 AMAQI
22nd Jul 2025358 AMAQI
22nd Jul 2025379 AMAQI
22nd Jul 20253510 AMAQI
22nd Jul 20253511 AMAQI
22nd Jul 20253412 PMAQI
22nd Jul 2025341 PMAQI
22nd Jul 2025342 PMAQI
22nd Jul 2025343 PMAQI
22nd Jul 2025364 PMAQI
22nd Jul 2025375 PMAQI
22nd Jul 2025366 PMAQI
22nd Jul 2025357 PMAQI
22nd Jul 2025348 PMAQI
22nd Jul 2025349 PMAQI
22nd Jul 20253010 PMAQI
22nd Jul 20253111 PMAQI
23rd Jul 20252912 AMAQI
23rd Jul 2025301 AMAQI
23rd Jul 2025302 AMAQI
23rd Jul 2025293 AMAQI
23rd Jul 2025284 AMAQI
24°C17/36°C
23rd Jul 2025195 AMAQI
23rd Jul 2025206 AMAQI
23rd Jul 2025247 AMAQI
23rd Jul 2025268 AMAQI
23rd Jul 2025299 AMAQI
23rd Jul 20253110 AMAQI
23rd Jul 20253111 AMAQI
23rd Jul 20253312 PMAQI
23rd Jul 2025361 PMAQI
23rd Jul 2025362 PMAQI
23rd Jul 2025343 PMAQI
23rd Jul 2025344 PMAQI
23rd Jul 2025345 PMAQI
23rd Jul 2025346 PMAQI
23rd Jul 2025317 PMAQI
23rd Jul 2025308 PMAQI
23rd Jul 2025319 PMAQI
23rd Jul 20253010 PMAQI
23rd Jul 20252911 PMAQI
24th Jul 20252712 AMAQI
24th Jul 2025281 AMAQI
24th Jul 2025282 AMAQI
24th Jul 2025283 AMAQI
24th Jul 2025284 AMAQI
23°C16/30°C
24th Jul 2025285 AMAQI
24th Jul 2025266 AMAQI
24th Jul 2025257 AMAQI
24th Jul 2025278 AMAQI
24th Jul 2025299 AMAQI
24th Jul 20253210 AMAQI
24th Jul 20253611 AMAQI
24th Jul 20254112 PMAQI
24th Jul 2025441 PMAQI
24th Jul 2025422 PMAQI
24th Jul 2025383 PMAQI
24th Jul 2025384 PMAQI
24th Jul 2025375 PMAQI
24th Jul 2025376 PMAQI
24th Jul 2025347 PMAQI
24th Jul 2025348 PMAQI
24th Jul 2025379 PMAQI
24th Jul 20253410 PMAQI
24th Jul 20253311 PMAQI
25th Jul 20253212 AMAQI
25th Jul 2025301 AMAQI
25th Jul 2025312 AMAQI
25th Jul 2025293 AMAQI
25th Jul 2025294 AMAQI
19°C15/30°C
25th Jul 2025285 AMAQI
25th Jul 2025286 AMAQI
25th Jul 2025287 AMAQI
25th Jul 2025318 AMAQI
25th Jul 2025329 AMAQI
25th Jul 20253410 AMAQI
25th Jul 20253711 AMAQI
25th Jul 20254012 PMAQI
25th Jul 2025381 PMAQI
25th Jul 2025402 PMAQI
25th Jul 2025383 PMAQI
25th Jul 2025384 PMAQI
25th Jul 2025435 PMAQI
25th Jul 2025436 PMAQI
25th Jul 2025377 PMAQI
25th Jul 2025368 PMAQI
25th Jul 2025409 PMAQI
25th Jul 20254010 PMAQI
25th Jul 20254211 PMAQI
26th Jul 20254412 AMAQI
26th Jul 2025461 AMAQI
26th Jul 2025462 AMAQI
26th Jul 2025463 AMAQI
26th Jul 2025474 AMAQI
23°C14/35°C
26th Jul 2025515 AMAQI
26th Jul 2025526 AMAQI
26th Jul 2025527 AMAQI
26th Jul 2025538 AMAQI
26th Jul 2025539 AMAQI
26th Jul 20255310 AMAQI
26th Jul 20255311 AMAQI
26th Jul 20255212 PMAQI
26th Jul 2025521 PMAQI
26th Jul 2025522 PMAQI
26th Jul 2025503 PMAQI
26th Jul 2025464 PMAQI
26th Jul 2025445 PMAQI
26th Jul 2025436 PMAQI
26th Jul 2025457 PMAQI
26th Jul 2025468 PMAQI
26th Jul 2025369 PMAQI
26th Jul 20253610 PMAQI
26th Jul 20253711 PMAQI
27th Jul 20253712 AMAQI
27th Jul 2025381 AMAQI
27th Jul 2025392 AMAQI
27th Jul 2025393 AMAQI
27th Jul 2025394 AMAQI
23°C13/36°C
27th Jul 2025345 AMAQI
27th Jul 2025296 AMAQI
27th Jul 2025307 AMAQI
27th Jul 2025308 AMAQI
27th Jul 2025299 AMAQI
27th Jul 20252910 AMAQI
27th Jul 20252811 AMAQI
27th Jul 20252712 PMAQI
27th Jul 2025251 PMAQI
27th Jul 2025252 PMAQI
27th Jul 2025263 PMAQI
27th Jul 2025264 PMAQI
27th Jul 2025265 PMAQI
27th Jul 2025266 PMAQI
27th Jul 2025287 PMAQI
27th Jul 2025298 PMAQI
27th Jul 2025269 PMAQI
27th Jul 20252710 PMAQI
27th Jul 20252811 PMAQI
28th Jul 20252912 AMAQI
28th Jul 2025311 AMAQI
28th Jul 2025332 AMAQI
28th Jul 2025333 AMAQI
28th Jul 2025314 AMAQI
25°C14/37°C
28th Jul 2025275 AMAQI
28th Jul 2025286 AMAQI
28th Jul 2025307 AMAQI
28th Jul 2025328 AMAQI
28th Jul 2025349 AMAQI
28th Jul 20253510 AMAQI
28th Jul 20253811 AMAQI
28th Jul 20253612 PMAQI
28th Jul 2025361 PMAQI
28th Jul 2025382 PMAQI
28th Jul 2025353 PMAQI
28th Jul 2025344 PMAQI
28th Jul 2025315 PMAQI
28th Jul 2025296 PMAQI
28th Jul 2025317 PMAQI
28th Jul 2025308 PMAQI
28th Jul 2025329 PMAQI
28th Jul 20253310 PMAQI
28th Jul 20253811 PMAQI
29th Jul 20254312 AMAQI
29th Jul 2025441 AMAQI
29th Jul 2025462 AMAQI
29th Jul 2025473 AMAQI
29th Jul 2025474 AMAQI
26°C15/36°C
29th Jul 2025535 AMAQI
29th Jul 2025526 AMAQI
29th Jul 2025527 AMAQI
29th Jul 2025498 AMAQI
29th Jul 2025519 AMAQI
29th Jul 20255310 AMAQI
29th Jul 20255411 AMAQI
29th Jul 20255412 PMAQI
29th Jul 2025541 PMAQI
29th Jul 2025542 PMAQI
29th Jul 2025533 PMAQI
29th Jul 2025534 PMAQI
29th Jul 2025535 PMAQI
29th Jul 2025546 PMAQI
29th Jul 2025537 PMAQI
29th Jul 2025528 PMAQI
29th Jul 2025529 PMAQI
29th Jul 20255310 PMAQI
29th Jul 20254711 PMAQI
30th Jul 20254412 AMAQI
30th Jul 2025451 AMAQI
30th Jul 2025422 AMAQI
30th Jul 2025423 AMAQI
30th Jul 2025414 AMAQI
23°C18/31°C
30th Jul 2025355 AMAQI
30th Jul 2025336 AMAQI
30th Jul 2025387 AMAQI
30th Jul 2025408 AMAQI
30th Jul 2025439 AMAQI
30th Jul 20254210 AMAQI
30th Jul 20254411 AMAQI
30th Jul 20254512 PMAQI
30th Jul 2025441 PMAQI
30th Jul 2025442 PMAQI
30th Jul 2025443 PMAQI
30th Jul 2025444 PMAQI
30th Jul 2025445 PMAQI
30th Jul 2025446 PMAQI
30th Jul 2025447 PMAQI
30th Jul 2025448 PMAQI
30th Jul 2025459 PMAQI
30th Jul 20254710 PMAQI
30th Jul 20254811 PMAQI
31st Jul 20254812 AMAQI
31st Jul 2025471 AMAQI
31st Jul 2025492 AMAQI
31st Jul 2025473 AMAQI
31st Jul 2025484 AMAQI
20°C15/26°C
31st Jul 2025475 AMAQI
31st Jul 2025466 AMAQI
31st Jul 2025487 AMAQI
31st Jul 2025478 AMAQI
31st Jul 2025499 AMAQI
31st Jul 20255210 AMAQI
31st Jul 20255411 AMAQI
31st Jul 20255512 PMAQI
31st Jul 2025561 PMAQI
31st Jul 2025562 PMAQI
31st Jul 2025583 PMAQI
31st Jul 2025574 PMAQI
31st Jul 2025615 PMAQI
31st Jul 2025646 PMAQI
31st Jul 2025517 PMAQI
31st Jul 2025548 PMAQI
31st Jul 2025649 PMAQI
31st Jul 20255910 PMAQI
31st Jul 20255511 PMAQI
1st Aug 20255412 AMAQI
1st Aug 2025511 AMAQI
1st Aug 2025502 AMAQI
1st Aug 2025483 AMAQI
1st Aug 2025474 AMAQI
20°C12/33°C
1st Aug 2025505 AMAQI
1st Aug 2025526 AMAQI
1st Aug 2025527 AMAQI
1st Aug 2025528 AMAQI
1st Aug 2025549 AMAQI
1st Aug 20255510 AMAQI
1st Aug 20255511 AMAQI
1st Aug 20255612 PMAQI
1st Aug 2025581 PMAQI
1st Aug 2025602 PMAQI
1st Aug 2025603 PMAQI
1st Aug 2025594 PMAQI
1st Aug 2025585 PMAQI
1st Aug 2025586 PMAQI
1st Aug 2025567 PMAQI
1st Aug 2025548 PMAQI
1st Aug 2025479 PMAQI
1st Aug 20254010 PMAQI
1st Aug 20253611 PMAQI
2nd Aug 20253412 AMAQI
2nd Aug 2025361 AMAQI
2nd Aug 2025362 AMAQI
2nd Aug 2025353 AMAQI
2nd Aug 2025354 AMAQI
21°C12/32°C
2nd Aug 2025345 AMAQI
2nd Aug 2025356 AMAQI
2nd Aug 2025367 AMAQI
2nd Aug 2025398 AMAQI
2nd Aug 2025409 AMAQI
2nd Aug 20254010 AMAQI
2nd Aug 20254411 AMAQI
2nd Aug 20254412 PMAQI
2nd Aug 2025451 PMAQI
2nd Aug 2025442 PMAQI
2nd Aug 2025433 PMAQI
2nd Aug 2025404 PMAQI
2nd Aug 2025395 PMAQI
2nd Aug 2025366 PMAQI
2nd Aug 2025367 PMAQI
2nd Aug 2025338 PMAQI
2nd Aug 2025349 PMAQI
2nd Aug 20253810 PMAQI
2nd Aug 20253411 PMAQI
3rd Aug 20252812 AMAQI
3rd Aug 2025251 AMAQI
3rd Aug 2025232 AMAQI
3rd Aug 2025233 AMAQI
3rd Aug 2025244 AMAQI
20°C12/31°C
3rd Aug 2025245 AMAQI
3rd Aug 2025226 AMAQI
3rd Aug 2025227 AMAQI
3rd Aug 2025238 AMAQI
3rd Aug 2025259 AMAQI
3rd Aug 20252510 AMAQI
3rd Aug 20252711 AMAQI
3rd Aug 20252812 PMAQI
3rd Aug 2025241 PMAQI
3rd Aug 2025242 PMAQI
3rd Aug 2025233 PMAQI
3rd Aug 2025224 PMAQI
3rd Aug 2025235 PMAQI
3rd Aug 2025246 PMAQI
3rd Aug 2025247 PMAQI
3rd Aug 2025248 PMAQI
3rd Aug 2025249 PMAQI
3rd Aug 20252410 PMAQI
3rd Aug 20252511 PMAQI
4th Aug 20252712 AMAQI
4th Aug 2025301 AMAQI
4th Aug 2025292 AMAQI
4th Aug 2025303 AMAQI
4th Aug 2025314 AMAQI
22°C12/32°C
4th Aug 2025315 AMAQI
4th Aug 2025306 AMAQI
4th Aug 2025327 AMAQI
4th Aug 2025348 AMAQI
4th Aug 2025379 AMAQI
4th Aug 20253710 AMAQI
4th Aug 20253711 AMAQI
4th Aug 20253712 PMAQI
4th Aug 2025381 PMAQI
4th Aug 2025402 PMAQI
4th Aug 2025403 PMAQI
4th Aug 2025464 PMAQI
4th Aug 2025485 PMAQI
4th Aug 2025506 PMAQI
4th Aug 2025347 PMAQI
4th Aug 2025448 PMAQI
4th Aug 2025549 PMAQI
4th Aug 20255610 PMAQI
4th Aug 20255611 PMAQI
5th Aug 20255612 AMAQI
5th Aug 2025541 AMAQI
5th Aug 2025542 AMAQI
5th Aug 2025543 AMAQI
5th Aug 2025544 AMAQI
24°C14/37°C
5th Aug 2025555 AMAQI
5th Aug 2025546 AMAQI
5th Aug 2025567 AMAQI
5th Aug 2025588 AMAQI
5th Aug 2025619 AMAQI
5th Aug 20256310 AMAQI
5th Aug 20256311 AMAQI
5th Aug 20256112 PMAQI
5th Aug 2025621 PMAQI
5th Aug 2025622 PMAQI
5th Aug 2025613 PMAQI
5th Aug 2025604 PMAQI
5th Aug 2025585 PMAQI
5th Aug 2025576 PMAQI
5th Aug 2025587 PMAQI
5th Aug 2025558 PMAQI
5th Aug 2025579 PMAQI
5th Aug 20255810 PMAQI
5th Aug 20256011 PMAQI
6th Aug 20256312 AMAQI
6th Aug 2025751 AMAQI
6th Aug 2025952 AMAQI
6th Aug 20251133 AMAQI
6th Aug 20251114 AMAQI
26°C13/38°C
6th Aug 20251165 AMAQI
6th Aug 20251266 AMAQI
6th Aug 20251247 AMAQI
6th Aug 20251258 AMAQI
6th Aug 20251199 AMAQI
6th Aug 202511710 AMAQI
6th Aug 202510911 AMAQI
6th Aug 20259812 PMAQI
6th Aug 2025881 PMAQI
6th Aug 2025852 PMAQI
6th Aug 2025793 PMAQI
6th Aug 2025694 PMAQI
6th Aug 2025665 PMAQI
6th Aug 2025636 PMAQI
6th Aug 2025897 PMAQI
6th Aug 2025668 PMAQI
6th Aug 2025559 PMAQI
6th Aug 20255510 PMAQI
6th Aug 20255611 PMAQI
7th Aug 20256312 AMAQI
7th Aug 2025731 AMAQI
7th Aug 2025762 AMAQI
7th Aug 2025753 AMAQI
7th Aug 2025744 AMAQI
26°C15/39°C
7th Aug 2025655 AMAQI
5 AM7th Aug 2025626 AMAQI
7th Aug 2025647 AMAQI
7th Aug 2025648 AMAQI
7th Aug 2025649 AMAQI
12 PM
8 PM
12 AM
4 AM
--°C/°C
Day time
Avg. Highest Time
5 AM - 8 PM
43AQI
16 hours / Day
480 hours / Month
Avg. Lowest Time
5 AM - 8 PM
43AQI
16 hours / Day
480 hours / Month
In the last 30 days, during the daytime, the highest AQI was between 5 AM to 8 PM (Avg. 43), while the lowest AQI was between 5 AM to 8 PM (Avg. 43).
Night time
Avg. Highest Time
12 AM - 11 PM
42AQI
8 hours / Day
240 hours / Month
Avg. Lowest Time
12 AM - 11 PM
42AQI
8 hours / Day
240 hours / Month
In the last 30 days, during the daytime, the highest AQI was between 12 AM to 11 PM (Avg. 42), while the lowest AQI was between 12 AM to 11 PM (Avg. 42).
2025 Days Vs Air Quality
Longmont, Colorado, United States
2025
94%
205
6%
13
Total number of days with different AQI categories in last 219 days in 2025 (146 days remaining)
Good
205 DaysModerate
13 DaysPoor
0 DaysUnhealthy
0 DaysSevere
0 DaysHazardous
0 DaysUnder WHO’s Safe Air Quality Limits: 94%
Health Risk Level:
Very Low
In 2025, 94% of 219 days were within WHO’s safe air quality limits. The risk of health issues is Very Low, but health impacts are still unclear.
Annual Air Quality Insights
Longmont, Colorado, 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 January 2025
38AQI
38AQI
2nd January 2025
36AQI
36AQI
3rd January 2025
52AQI
52AQI
4th January 2025
42AQI
42AQI
5th January 2025
28AQI
28AQI
6th January 2025
47AQI
47AQI
7th January 2025
41AQI
41AQI
8th January 2025
50AQI
50AQI
9th January 2025
25AQI
25AQI
10th January 2025
30AQI
30AQI
11th January 2025
24AQI
24AQI
12th January 2025
23AQI
23AQI
13th January 2025
24AQI
24AQI
14th January 2025
26AQI
26AQI
15th January 2025
29AQI
29AQI
16th January 2025
40AQI
40AQI
17th January 2025
48AQI
48AQI
18th January 2025
21AQI
21AQI
19th January 2025
40AQI
40AQI
20th January 2025
26AQI
26AQI
21st January 2025
47AQI
47AQI
22nd January 2025
22AQI
22AQI
23rd January 2025
27AQI
27AQI
24th January 2025
33AQI
33AQI
25th January 2025
21AQI
21AQI
26th January 2025
44AQI
44AQI
27th January 2025
58AQI
58AQI
28th January 2025
53AQI
53AQI
29th January 2025
48AQI
48AQI
30th January 2025
39AQI
39AQI
31st January 2025
42AQI
42AQI
1st February 2025
24AQI
24AQI
2nd February 2025
20AQI
20AQI
3rd February 2025
26AQI
26AQI
4th February 2025
49AQI
49AQI
5th February 2025
42AQI
42AQI
6th February 2025
23AQI
23AQI
7th February 2025
35AQI
35AQI
8th February 2025
29AQI
29AQI
9th February 2025
22AQI
22AQI
10th February 2025
25AQI
25AQI
11th February 2025
37AQI
37AQI
12th February 2025
30AQI
30AQI
13th February 2025
48AQI
48AQI
14th February 2025
58AQI
58AQI
15th February 2025
41AQI
41AQI
16th February 2025
37AQI
37AQI
17th February 2025
36AQI
36AQI
18th February 2025
38AQI
38AQI
19th February 2025
34AQI
34AQI
20th February 2025
45AQI
45AQI
21st February 2025
28AQI
28AQI
22nd February 2025
35AQI
35AQI
23rd February 2025
18AQI
18AQI
24th February 2025
15AQI
15AQI
25th February 2025
16AQI
16AQI
26th February 2025
15AQI
15AQI
27th February 2025
18AQI
18AQI
28th February 2025
22AQI
22AQI
1st March 2025
25AQI
25AQI
2nd March 2025
25AQI
25AQI
3rd March 2025
27AQI
27AQI
4th March 2025
19AQI
19AQI
5th March 2025
17AQI
17AQI
6th March 2025
20AQI
20AQI
7th March 2025
17AQI
17AQI
8th March 2025
22AQI
22AQI
9th March 2025
17AQI
17AQI
10th March 2025
22AQI
22AQI
11th March 2025
20AQI
20AQI
12th March 2025
21AQI
21AQI
13th March 2025
22AQI
22AQI
14th March 2025
23AQI
23AQI
15th March 2025
18AQI
18AQI
16th March 2025
18AQI
18AQI
17th March 2025
25AQI
25AQI
18th March 2025
22AQI
22AQI
19th March 2025
15AQI
15AQI
20th March 2025
23AQI
23AQI
21st March 2025
17AQI
17AQI
22nd March 2025
18AQI
18AQI
23rd March 2025
16AQI
16AQI
24th March 2025
16AQI
16AQI
25th March 2025
24AQI
24AQI
26th March 2025
29AQI
29AQI
27th March 2025
32AQI
32AQI
28th March 2025
30AQI
30AQI
29th March 2025
20AQI
20AQI
30th March 2025
23AQI
23AQI
31st March 2025
38AQI
38AQI
1st April 2025
23AQI
23AQI
2nd April 2025
18AQI
18AQI
3rd April 2025
19AQI
19AQI
4th April 2025
21AQI
21AQI
5th April 2025
28AQI
28AQI
6th April 2025
25AQI
25AQI
7th April 2025
33AQI
33AQI
8th April 2025
30AQI
30AQI
9th April 2025
45AQI
45AQI
10th April 2025
45AQI
45AQI
11th April 2025
44AQI
44AQI
12th April 2025
36AQI
36AQI
13th April 2025
25AQI
25AQI
14th April 2025
23AQI
23AQI
15th April 2025
37AQI
37AQI
16th April 2025
31AQI
31AQI
17th April 2025
24AQI
24AQI
18th April 2025
15AQI
15AQI
19th April 2025
25AQI
25AQI
20th April 2025
30AQI
30AQI
21st April 2025
18AQI
18AQI
22nd April 2025
22AQI
22AQI
23rd April 2025
33AQI
33AQI
24th April 2025
55AQI
55AQI
25th April 2025
22AQI
22AQI
26th April 2025
25AQI
25AQI
27th April 2025
40AQI
40AQI
28th April 2025
18AQI
18AQI
29th April 2025
19AQI
19AQI
30th April 2025
21AQI
21AQI
1st May 2025
16AQI
16AQI
2nd May 2025
20AQI
20AQI
3rd May 2025
24AQI
24AQI
4th May 2025
26AQI
26AQI
5th May 2025
25AQI
25AQI
6th May 2025
21AQI
21AQI
7th May 2025
23AQI
23AQI
8th May 2025
30AQI
30AQI
9th May 2025
30AQI
30AQI
10th May 2025
29AQI
29AQI
11th May 2025
28AQI
28AQI
12th May 2025
28AQI
28AQI
13th May 2025
34AQI
34AQI
14th May 2025
38AQI
38AQI
15th May 2025
15AQI
15AQI
16th May 2025
16AQI
16AQI
17th May 2025
19AQI
19AQI
18th May 2025
32AQI
32AQI
19th May 2025
15AQI
15AQI
20th May 2025
20AQI
20AQI
21st May 2025
20AQI
20AQI
22nd May 2025
26AQI
26AQI
23rd May 2025
33AQI
33AQI
24th May 2025
45AQI
45AQI
25th May 2025
18AQI
18AQI
26th May 2025
20AQI
20AQI
27th May 2025
35AQI
35AQI
28th May 2025
25AQI
25AQI
29th May 2025
18AQI
18AQI
30th May 2025
28AQI
28AQI
31st May 2025
28AQI
28AQI
1st June 2025
34AQI
34AQI
2nd June 2025
23AQI
23AQI
3rd June 2025
21AQI
21AQI
4th June 2025
35AQI
35AQI
5th June 2025
38AQI
38AQI
6th June 2025
22AQI
22AQI
7th June 2025
24AQI
24AQI
8th June 2025
35AQI
35AQI
9th June 2025
52AQI
52AQI
10th June 2025
43AQI
43AQI
11th June 2025
31AQI
31AQI
12th June 2025
30AQI
30AQI
13th June 2025
32AQI
32AQI
14th June 2025
35AQI
35AQI
15th June 2025
32AQI
32AQI
16th June 2025
31AQI
31AQI
17th June 2025
28AQI
28AQI
18th June 2025
27AQI
27AQI
19th June 2025
38AQI
38AQI
20th June 2025
36AQI
36AQI
21st June 2025
34AQI
34AQI
22nd June 2025
35AQI
35AQI
23rd June 2025
37AQI
37AQI
24th June 2025
50AQI
50AQI
25th June 2025
39AQI
39AQI
26th June 2025
30AQI
30AQI
27th June 2025
36AQI
36AQI
28th June 2025
41AQI
41AQI
29th June 2025
37AQI
37AQI
30th June 2025
32AQI
32AQI
1st July 2025
34AQI
34AQI
2nd July 2025
33AQI
33AQI
3rd July 2025
29AQI
29AQI
4th July 2025
26AQI
26AQI
5th July 2025
36AQI
36AQI
6th July 2025
31AQI
31AQI
7th July 2025
31AQI
31AQI
8th July 2025
33AQI
33AQI
9th July 2025
32AQI
32AQI
10th July 2025
35AQI
35AQI
11th July 2025
39AQI
39AQI
12th July 2025
58AQI
58AQI
13th July 2025
49AQI
49AQI
14th July 2025
38AQI
38AQI
15th July 2025
35AQI
35AQI
16th July 2025
44AQI
44AQI
17th July 2025
50AQI
50AQI
18th July 2025
52AQI
52AQI
19th July 2025
49AQI
49AQI
20th July 2025
40AQI
40AQI
21st July 2025
35AQI
35AQI
22nd July 2025
35AQI
35AQI
23rd July 2025
30AQI
30AQI
24th July 2025
33AQI
33AQI
25th July 2025
35AQI
35AQI
26th July 2025
47AQI
47AQI
27th July 2025
31AQI
31AQI
28th July 2025
32AQI
32AQI
29th July 2025
51AQI
51AQI
30th July 2025
43AQI
43AQI
31st July 2025
53AQI
53AQI
1st August 2025
52AQI
52AQI
2nd August 2025
37AQI
37AQI
3rd August 2025
24AQI
24AQI
4th August 2025
39AQI
39AQI
5th August 2025
57AQI
57AQI
6th August 2025
94AQI
94AQI
36AQI
31AQI
22AQI
28AQI
25AQI
34AQI
39AQI
51AQI
No. of days
Jan.Feb.Mar.Apr.MayJun.Jul.Aug.Sep.Oct.Nov.Dec.Total Days
202531AQI
28
3
27
1
31
29
1
31
29
1
27
4
3
3
205
13
Highest AQI recorded in
August51AQI
Lowest AQI recorded in
March22AQI
202430AQI
25
2
29
31
30
31
29
23
8
29
2
29
1
21
10
28
2
31
336
25
Highest AQI recorded in
July44AQI
Lowest AQI recorded in
May20AQI
202329AQI
18
13
24
4
31
30
24
4
1
1
30
31
30
1
28
2
30
1
28
30
1
334
26
1
1
Highest AQI recorded in
January44AQI
Lowest AQI recorded in
December19AQI
202230AQI
20
10
18
4
31
30
31
29
1
21
3
26
3
30
1
29
1
26
4
294
24
Highest AQI recorded in
January45AQI
Lowest AQI recorded in
July23AQI
202140AQI
22
8
19
8
1
24
3
29
1
27
1
20
3
15
16
8
18
5
20
8
2
31
26
4
28
3
269
73
8
Highest AQI recorded in
August71AQI
Lowest AQI recorded in
April29AQI
202041AQI
10
1
19
1
18
29
1
29
15
11
5
12
14
4
15
12
3
1
23
3
23
8
193
51
12
1
Highest AQI recorded in
August61AQI
Lowest AQI recorded in
May23AQI
Most & Least Polluted Years Over the Last 6 Years
Most Polluted Year Recorded
2020(Avg.)
41AQILeast Polluted Year Recorded
2023(Avg.)
29AQILongmont's annual 2025 AQI (31) shows an average percentage change of -5.7% (improved AQI) compared to previous years: 2020 (41), 2021 (40), 2022 (30), 2023 (29), 2024 (30).
