Welby, 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
Welby, Colorado, United States
2021
2022
2023
2024
2025
AQI
.
Days
AQI Trends: Highest and Lowest
Highest AQI recorded on
11th Aug 2021
82AQILowest AQI recorded on
25th Aug 2024
19AQISame Day Analysis (9th August ):
On this day, AQI across the 5 years varied significantly: 2025 ranks 3rd highest AQI at 51 of Moderate air quality, showing improvement over 2023 and 2021 on the same day.
Download 2024 Annual Data
World Air Quality Report
Day & Night AQI Trend: 9th Aug - 10th Aug 2025
Welby, Colorado, United States
AQI
Day
Night
.
5 AM9th Aug 2025
8 PM
4 AM10th Aug 2025
Day time
Avg. Highest Time
4PM9th Aug
54AQI
Avg. Lowest Time
6AM9th Aug
42AQI
Night time
Avg. Highest Time
9PM9th Aug
52AQI
Avg. Lowest Time
5AM9th Aug
43AQI
In the last 24 hours,
Welby's AQI reached its highest point of 54 at 4 PM during the Day, while the lowest point, 42, was recorded at 6 AM during the Day between 9th Aug and 10th Aug 2025.
Day & Night AQI Trend : Jul - Aug 2025
Welby, Colorado, United States
JulAug
11th - 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 - 10th10th
Day
Night
11th Jul 2025365 AMAQI
11th Jul 2025366 AMAQI
11th Jul 2025367 AMAQI
11th Jul 2025408 AMAQI
11th Jul 2025429 AMAQI
11th Jul 20254410 AMAQI
11th Jul 20254311 AMAQI
11th Jul 20254212 PMAQI
11th Jul 2025401 PMAQI
11th Jul 2025392 PMAQI
11th Jul 2025363 PMAQI
11th Jul 2025384 PMAQI
11th Jul 2025395 PMAQI
11th Jul 2025356 PMAQI
11th Jul 2025417 PMAQI
11th Jul 2025428 PMAQI
11th Jul 2025429 PMAQI
11th Jul 20254810 PMAQI
11th Jul 20255111 PMAQI
12th Jul 20255412 AMAQI
12th Jul 2025541 AMAQI
12th Jul 2025532 AMAQI
12th Jul 2025553 AMAQI
12th Jul 2025554 AMAQI
22°C17/31°C
12th Jul 2025675 AMAQI
12th Jul 2025626 AMAQI
12th Jul 2025607 AMAQI
12th Jul 2025608 AMAQI
12th Jul 2025609 AMAQI
12th Jul 20255910 AMAQI
12th Jul 20255811 AMAQI
12th Jul 20255812 PMAQI
12th Jul 2025571 PMAQI
12th Jul 2025572 PMAQI
12th Jul 2025573 PMAQI
12th Jul 2025564 PMAQI
12th Jul 2025555 PMAQI
12th Jul 2025556 PMAQI
12th Jul 2025567 PMAQI
12th Jul 2025568 PMAQI
12th Jul 2025549 PMAQI
12th Jul 20255410 PMAQI
12th Jul 20255411 PMAQI
13th Jul 20255612 AMAQI
13th Jul 2025551 AMAQI
13th Jul 2025542 AMAQI
13th Jul 2025553 AMAQI
13th Jul 2025554 AMAQI
23°C16/31°C
13th Jul 2025515 AMAQI
13th Jul 2025516 AMAQI
13th Jul 2025507 AMAQI
13th Jul 2025488 AMAQI
13th Jul 2025509 AMAQI
13th Jul 20254910 AMAQI
13th Jul 20255211 AMAQI
13th Jul 20254812 PMAQI
13th Jul 2025471 PMAQI
13th Jul 2025502 PMAQI
13th Jul 2025503 PMAQI
13th Jul 2025514 PMAQI
13th Jul 2025505 PMAQI
13th Jul 2025506 PMAQI
13th Jul 2025527 PMAQI
13th Jul 2025528 PMAQI
13th Jul 2025509 PMAQI
13th Jul 20254810 PMAQI
13th Jul 20254811 PMAQI
14th Jul 20254912 AMAQI
14th Jul 2025491 AMAQI
14th Jul 2025462 AMAQI
14th Jul 2025453 AMAQI
14th Jul 2025484 AMAQI
27°C18/35°C
14th Jul 2025305 AMAQI
14th Jul 2025266 AMAQI
14th Jul 2025347 AMAQI
14th Jul 2025368 AMAQI
14th Jul 2025389 AMAQI
14th Jul 20254110 AMAQI
14th Jul 20254011 AMAQI
14th Jul 20254012 PMAQI
14th Jul 2025381 PMAQI
14th Jul 2025342 PMAQI
14th Jul 2025393 PMAQI
14th Jul 2025404 PMAQI
14th Jul 2025415 PMAQI
14th Jul 2025426 PMAQI
14th Jul 2025407 PMAQI
14th Jul 2025408 PMAQI
14th Jul 2025369 PMAQI
14th Jul 20253610 PMAQI
14th Jul 20253611 PMAQI
15th Jul 20253612 AMAQI
15th Jul 2025361 AMAQI
15th Jul 2025372 AMAQI
15th Jul 2025343 AMAQI
15th Jul 2025374 AMAQI
27°C20/37°C
15th Jul 2025305 AMAQI
15th Jul 2025296 AMAQI
15th Jul 2025317 AMAQI
15th Jul 2025368 AMAQI
15th Jul 2025409 AMAQI
15th Jul 20254610 AMAQI
15th Jul 20254611 AMAQI
15th Jul 20254012 PMAQI
15th Jul 2025341 PMAQI
15th Jul 2025412 PMAQI
15th Jul 2025363 PMAQI
15th Jul 2025364 PMAQI
15th Jul 2025355 PMAQI
15th Jul 2025356 PMAQI
15th Jul 2025367 PMAQI
15th Jul 2025378 PMAQI
15th Jul 2025389 PMAQI
15th Jul 20253610 PMAQI
15th Jul 20253711 PMAQI
16th Jul 20253912 AMAQI
16th Jul 2025391 AMAQI
16th Jul 2025382 AMAQI
16th Jul 2025403 AMAQI
16th Jul 2025404 AMAQI
28°C19/37°C
16th Jul 2025435 AMAQI
16th Jul 2025386 AMAQI
16th Jul 2025407 AMAQI
16th Jul 2025418 AMAQI
16th Jul 2025419 AMAQI
16th Jul 20254410 AMAQI
16th Jul 20254211 AMAQI
16th Jul 20254212 PMAQI
16th Jul 2025441 PMAQI
16th Jul 2025442 PMAQI
16th Jul 2025453 PMAQI
16th Jul 2025454 PMAQI
16th Jul 2025485 PMAQI
16th Jul 2025486 PMAQI
16th Jul 2025437 PMAQI
16th Jul 2025438 PMAQI
16th Jul 2025459 PMAQI
16th Jul 20254310 PMAQI
16th Jul 20254211 PMAQI
17th Jul 20254412 AMAQI
17th Jul 2025421 AMAQI
17th Jul 2025412 AMAQI
17th Jul 2025413 AMAQI
17th Jul 2025414 AMAQI
21°C16/27°C
17th Jul 2025505 AMAQI
17th Jul 2025466 AMAQI
17th Jul 2025487 AMAQI
17th Jul 2025478 AMAQI
17th Jul 2025489 AMAQI
17th Jul 20254810 AMAQI
17th Jul 20255111 AMAQI
17th Jul 20255012 PMAQI
17th Jul 2025521 PMAQI
17th Jul 2025542 PMAQI
17th Jul 2025533 PMAQI
17th Jul 2025554 PMAQI
17th Jul 2025545 PMAQI
17th Jul 2025546 PMAQI
17th Jul 2025527 PMAQI
17th Jul 2025518 PMAQI
17th Jul 2025519 PMAQI
17th Jul 20254810 PMAQI
17th Jul 20254711 PMAQI
18th Jul 20254712 AMAQI
18th Jul 2025481 AMAQI
18th Jul 2025472 AMAQI
18th Jul 2025483 AMAQI
18th Jul 2025514 AMAQI
22°C15/32°C
18th Jul 2025505 AMAQI
18th Jul 2025506 AMAQI
18th Jul 2025507 AMAQI
18th Jul 2025528 AMAQI
18th Jul 2025559 AMAQI
18th Jul 20255810 AMAQI
18th Jul 20255711 AMAQI
18th Jul 20255512 PMAQI
18th Jul 2025541 PMAQI
18th Jul 2025542 PMAQI
18th Jul 2025533 PMAQI
18th Jul 2025534 PMAQI
18th Jul 2025545 PMAQI
18th Jul 2025536 PMAQI
18th Jul 2025537 PMAQI
18th Jul 2025498 PMAQI
18th Jul 2025489 PMAQI
18th Jul 20254910 PMAQI
18th Jul 20255211 PMAQI
19th Jul 20255212 AMAQI
19th Jul 2025531 AMAQI
19th Jul 2025542 AMAQI
19th Jul 2025543 AMAQI
19th Jul 2025524 AMAQI
25°C17/36°C
19th Jul 2025505 AMAQI
19th Jul 2025466 AMAQI
19th Jul 2025517 AMAQI
19th Jul 2025508 AMAQI
19th Jul 2025509 AMAQI
19th Jul 20254910 AMAQI
19th Jul 20254711 AMAQI
19th Jul 20254812 PMAQI
19th Jul 2025491 PMAQI
19th Jul 2025492 PMAQI
19th Jul 2025513 PMAQI
19th Jul 2025514 PMAQI
19th Jul 2025505 PMAQI
19th Jul 2025506 PMAQI
19th Jul 2025507 PMAQI
19th Jul 2025508 PMAQI
19th Jul 2025479 PMAQI
19th Jul 20254610 PMAQI
19th Jul 20254411 PMAQI
20th Jul 20254512 AMAQI
20th Jul 2025461 AMAQI
20th Jul 2025472 AMAQI
20th Jul 2025473 AMAQI
20th Jul 2025464 AMAQI
25°C17/35°C
20th Jul 2025385 AMAQI
20th Jul 2025376 AMAQI
20th Jul 2025387 AMAQI
20th Jul 2025368 AMAQI
20th Jul 2025369 AMAQI
20th Jul 20253310 AMAQI
20th Jul 20253511 AMAQI
20th Jul 20253312 PMAQI
20th Jul 2025321 PMAQI
20th Jul 2025342 PMAQI
20th Jul 2025363 PMAQI
20th Jul 2025374 PMAQI
20th Jul 2025365 PMAQI
20th Jul 2025376 PMAQI
20th Jul 2025387 PMAQI
20th Jul 2025398 PMAQI
20th Jul 2025379 PMAQI
20th Jul 20253610 PMAQI
20th Jul 20253511 PMAQI
21st Jul 20253612 AMAQI
21st Jul 2025341 AMAQI
21st Jul 2025342 AMAQI
21st Jul 2025363 AMAQI
21st Jul 2025354 AMAQI
25°C20/36°C
21st Jul 2025255 AMAQI
21st Jul 2025246 AMAQI
21st Jul 2025307 AMAQI
21st Jul 2025348 AMAQI
21st Jul 2025429 AMAQI
21st Jul 20254810 AMAQI
21st Jul 20253811 AMAQI
21st Jul 20253812 PMAQI
21st Jul 2025391 PMAQI
21st Jul 2025352 PMAQI
21st Jul 2025343 PMAQI
21st Jul 2025334 PMAQI
21st Jul 2025325 PMAQI
21st Jul 2025336 PMAQI
21st Jul 2025347 PMAQI
21st Jul 2025348 PMAQI
21st Jul 2025339 PMAQI
21st Jul 20253210 PMAQI
21st Jul 20253511 PMAQI
22nd Jul 20253412 AMAQI
22nd Jul 2025351 AMAQI
22nd Jul 2025332 AMAQI
22nd Jul 2025323 AMAQI
22nd Jul 2025324 AMAQI
26°C19/37°C
22nd Jul 2025285 AMAQI
22nd Jul 2025246 AMAQI
22nd Jul 2025287 AMAQI
22nd Jul 2025328 AMAQI
22nd Jul 2025349 AMAQI
22nd Jul 20253410 AMAQI
22nd Jul 20253211 AMAQI
22nd Jul 20253212 PMAQI
22nd Jul 2025331 PMAQI
22nd Jul 2025322 PMAQI
22nd Jul 2025323 PMAQI
22nd Jul 2025334 PMAQI
22nd Jul 2025325 PMAQI
22nd Jul 2025326 PMAQI
22nd Jul 2025327 PMAQI
22nd Jul 2025328 PMAQI
22nd Jul 2025319 PMAQI
22nd Jul 20253010 PMAQI
22nd Jul 20253111 PMAQI
23rd Jul 20253012 AMAQI
23rd Jul 2025301 AMAQI
23rd Jul 2025302 AMAQI
23rd Jul 2025283 AMAQI
23rd Jul 2025284 AMAQI
26°C18/36°C
23rd Jul 2025195 AMAQI
23rd Jul 2025186 AMAQI
23rd Jul 2025217 AMAQI
23rd Jul 2025238 AMAQI
23rd Jul 2025249 AMAQI
23rd Jul 20252610 AMAQI
23rd Jul 20252611 AMAQI
23rd Jul 20252712 PMAQI
23rd Jul 2025281 PMAQI
23rd Jul 2025312 PMAQI
23rd Jul 2025303 PMAQI
23rd Jul 2025304 PMAQI
23rd Jul 2025305 PMAQI
23rd Jul 2025316 PMAQI
23rd Jul 2025267 PMAQI
23rd Jul 2025288 PMAQI
23rd Jul 2025309 PMAQI
23rd Jul 20253010 PMAQI
23rd Jul 20252811 PMAQI
24th Jul 20252612 AMAQI
24th Jul 2025271 AMAQI
24th Jul 2025272 AMAQI
24th Jul 2025273 AMAQI
24th Jul 2025284 AMAQI
25°C20/32°C
24th Jul 2025275 AMAQI
24th Jul 2025276 AMAQI
24th Jul 2025277 AMAQI
24th Jul 2025298 AMAQI
24th Jul 2025309 AMAQI
24th Jul 20253410 AMAQI
24th Jul 20253611 AMAQI
24th Jul 20253812 PMAQI
24th Jul 2025331 PMAQI
24th Jul 2025322 PMAQI
24th Jul 2025323 PMAQI
24th Jul 2025324 PMAQI
24th Jul 2025315 PMAQI
24th Jul 2025316 PMAQI
24th Jul 2025307 PMAQI
24th Jul 2025308 PMAQI
24th Jul 2025309 PMAQI
24th Jul 20253110 PMAQI
24th Jul 20253011 PMAQI
25th Jul 20253012 AMAQI
25th Jul 2025291 AMAQI
25th Jul 2025292 AMAQI
25th Jul 2025283 AMAQI
25th Jul 2025284 AMAQI
21°C17/32°C
25th Jul 2025265 AMAQI
25th Jul 2025266 AMAQI
25th Jul 2025287 AMAQI
25th Jul 2025328 AMAQI
25th Jul 2025339 AMAQI
25th Jul 20253910 AMAQI
25th Jul 20254011 AMAQI
25th Jul 20253712 PMAQI
25th Jul 2025391 PMAQI
25th Jul 2025382 PMAQI
25th Jul 2025403 PMAQI
25th Jul 2025394 PMAQI
25th Jul 2025395 PMAQI
25th Jul 2025386 PMAQI
25th Jul 2025357 PMAQI
25th Jul 2025348 PMAQI
25th Jul 2025379 PMAQI
25th Jul 20253610 PMAQI
25th Jul 20253511 PMAQI
26th Jul 20253712 AMAQI
26th Jul 2025371 AMAQI
26th Jul 2025362 AMAQI
26th Jul 2025363 AMAQI
26th Jul 2025374 AMAQI
24°C17/35°C
26th Jul 2025415 AMAQI
26th Jul 2025446 AMAQI
26th Jul 2025457 AMAQI
26th Jul 2025478 AMAQI
26th Jul 2025509 AMAQI
26th Jul 20255010 AMAQI
26th Jul 20254811 AMAQI
26th Jul 20254412 PMAQI
26th Jul 2025461 PMAQI
26th Jul 2025402 PMAQI
26th Jul 2025383 PMAQI
26th Jul 2025384 PMAQI
26th Jul 2025405 PMAQI
26th Jul 2025386 PMAQI
26th Jul 2025407 PMAQI
26th Jul 2025408 PMAQI
26th Jul 2025369 PMAQI
26th Jul 20253510 PMAQI
26th Jul 20253711 PMAQI
27th Jul 20253812 AMAQI
27th Jul 2025371 AMAQI
27th Jul 2025382 AMAQI
27th Jul 2025373 AMAQI
27th Jul 2025394 AMAQI
25°C18/36°C
27th Jul 2025325 AMAQI
27th Jul 2025286 AMAQI
27th Jul 2025307 AMAQI
27th Jul 2025318 AMAQI
27th Jul 2025329 AMAQI
27th Jul 20253010 AMAQI
27th Jul 20252811 AMAQI
27th Jul 20252812 PMAQI
27th Jul 2025271 PMAQI
27th Jul 2025282 PMAQI
27th Jul 2025303 PMAQI
27th Jul 2025284 PMAQI
27th Jul 2025295 PMAQI
27th Jul 2025286 PMAQI
27th Jul 2025317 PMAQI
27th Jul 2025318 PMAQI
27th Jul 2025289 PMAQI
27th Jul 20253010 PMAQI
27th Jul 20253011 PMAQI
28th Jul 20253212 AMAQI
28th Jul 2025321 AMAQI
28th Jul 2025332 AMAQI
28th Jul 2025343 AMAQI
28th Jul 2025324 AMAQI
27°C19/38°C
28th Jul 2025315 AMAQI
28th Jul 2025346 AMAQI
28th Jul 2025387 AMAQI
28th Jul 2025398 AMAQI
28th Jul 2025449 AMAQI
28th Jul 20255610 AMAQI
28th Jul 20255011 AMAQI
28th Jul 20254412 PMAQI
28th Jul 2025391 PMAQI
28th Jul 2025382 PMAQI
28th Jul 2025343 PMAQI
28th Jul 2025334 PMAQI
28th Jul 2025315 PMAQI
28th Jul 2025326 PMAQI
28th Jul 2025317 PMAQI
28th Jul 2025328 PMAQI
28th Jul 2025349 PMAQI
28th Jul 20253410 PMAQI
28th Jul 20253911 PMAQI
29th Jul 20254212 AMAQI
29th Jul 2025441 AMAQI
29th Jul 2025432 AMAQI
29th Jul 2025423 AMAQI
29th Jul 2025404 AMAQI
28°C19/36°C
29th Jul 2025445 AMAQI
29th Jul 2025446 AMAQI
29th Jul 2025477 AMAQI
29th Jul 2025478 AMAQI
29th Jul 2025509 AMAQI
29th Jul 20255010 AMAQI
29th Jul 20254811 AMAQI
29th Jul 20254912 PMAQI
29th Jul 2025481 PMAQI
29th Jul 2025482 PMAQI
29th Jul 2025483 PMAQI
29th Jul 2025494 PMAQI
29th Jul 2025505 PMAQI
29th Jul 2025506 PMAQI
29th Jul 2025507 PMAQI
29th Jul 2025498 PMAQI
29th Jul 2025459 PMAQI
29th Jul 20254610 PMAQI
29th Jul 20254411 PMAQI
30th Jul 20254312 AMAQI
30th Jul 2025461 AMAQI
30th Jul 2025462 AMAQI
30th Jul 2025443 AMAQI
30th Jul 2025434 AMAQI
24°C20/30°C
30th Jul 2025325 AMAQI
30th Jul 2025316 AMAQI
30th Jul 2025377 AMAQI
30th Jul 2025418 AMAQI
30th Jul 2025449 AMAQI
30th Jul 20253910 AMAQI
30th Jul 20253811 AMAQI
30th Jul 20253912 PMAQI
30th Jul 2025401 PMAQI
30th Jul 2025402 PMAQI
30th Jul 2025413 PMAQI
30th Jul 2025414 PMAQI
30th Jul 2025415 PMAQI
30th Jul 2025416 PMAQI
30th Jul 2025417 PMAQI
30th Jul 2025418 PMAQI
30th Jul 2025459 PMAQI
30th Jul 20254610 PMAQI
30th Jul 20254611 PMAQI
31st Jul 20254812 AMAQI
31st Jul 2025461 AMAQI
31st Jul 2025502 AMAQI
31st Jul 2025483 AMAQI
31st Jul 2025514 AMAQI
20°C17/25°C
31st Jul 2025525 AMAQI
31st Jul 2025516 AMAQI
31st Jul 2025537 AMAQI
31st Jul 2025538 AMAQI
31st Jul 2025549 AMAQI
31st Jul 20255510 AMAQI
31st Jul 20255711 AMAQI
31st Jul 20255912 PMAQI
31st Jul 2025601 PMAQI
31st Jul 2025572 PMAQI
31st Jul 2025573 PMAQI
31st Jul 2025564 PMAQI
31st Jul 2025585 PMAQI
31st Jul 2025596 PMAQI
31st Jul 2025567 PMAQI
31st Jul 2025568 PMAQI
31st Jul 2025599 PMAQI
31st Jul 20255710 PMAQI
31st Jul 20255611 PMAQI
1st Aug 20255412 AMAQI
1st Aug 2025531 AMAQI
1st Aug 2025532 AMAQI
1st Aug 2025543 AMAQI
1st Aug 2025544 AMAQI
22°C16/32°C
1st Aug 2025555 AMAQI
1st Aug 2025566 AMAQI
1st Aug 2025597 AMAQI
1st Aug 2025598 AMAQI
1st Aug 2025609 AMAQI
1st Aug 20256010 AMAQI
1st Aug 20255811 AMAQI
1st Aug 20255812 PMAQI
1st Aug 2025581 PMAQI
1st Aug 2025582 PMAQI
1st Aug 2025583 PMAQI
1st Aug 2025584 PMAQI
1st Aug 2025585 PMAQI
1st Aug 2025576 PMAQI
1st Aug 2025587 PMAQI
1st Aug 2025568 PMAQI
1st Aug 2025469 PMAQI
1st Aug 20253910 PMAQI
1st Aug 20253211 PMAQI
2nd Aug 20253012 AMAQI
2nd Aug 2025351 AMAQI
2nd Aug 2025382 AMAQI
2nd Aug 2025403 AMAQI
2nd Aug 2025394 AMAQI
22°C16/32°C
2nd Aug 2025385 AMAQI
2nd Aug 2025396 AMAQI
2nd Aug 2025427 AMAQI
2nd Aug 2025458 AMAQI
2nd Aug 2025479 AMAQI
2nd Aug 20255210 AMAQI
2nd Aug 20255011 AMAQI
2nd Aug 20254612 PMAQI
2nd Aug 2025461 PMAQI
2nd Aug 2025422 PMAQI
2nd Aug 2025363 PMAQI
2nd Aug 2025344 PMAQI
2nd Aug 2025365 PMAQI
2nd Aug 2025366 PMAQI
2nd Aug 2025367 PMAQI
2nd Aug 2025338 PMAQI
2nd Aug 2025329 PMAQI
2nd Aug 20253210 PMAQI
2nd Aug 20253211 PMAQI
3rd Aug 20252812 AMAQI
3rd Aug 2025271 AMAQI
3rd Aug 2025252 AMAQI
3rd Aug 2025263 AMAQI
3rd Aug 2025284 AMAQI
23°C15/34°C
3rd Aug 2025275 AMAQI
3rd Aug 2025266 AMAQI
3rd Aug 2025287 AMAQI
3rd Aug 2025288 AMAQI
3rd Aug 2025309 AMAQI
3rd Aug 20252910 AMAQI
3rd Aug 20253411 AMAQI
3rd Aug 20253212 PMAQI
3rd Aug 2025261 PMAQI
3rd Aug 2025222 PMAQI
3rd Aug 2025213 PMAQI
3rd Aug 2025214 PMAQI
3rd Aug 2025225 PMAQI
3rd Aug 2025206 PMAQI
3rd Aug 2025267 PMAQI
3rd Aug 2025238 PMAQI
3rd Aug 2025209 PMAQI
3rd Aug 20252110 PMAQI
3rd Aug 20252311 PMAQI
4th Aug 20252412 AMAQI
4th Aug 2025251 AMAQI
4th Aug 2025242 AMAQI
4th Aug 2025263 AMAQI
4th Aug 2025284 AMAQI
25°C16/33°C
4th Aug 2025285 AMAQI
4th Aug 2025316 AMAQI
4th Aug 2025327 AMAQI
4th Aug 2025408 AMAQI
4th Aug 2025459 AMAQI
4th Aug 20254910 AMAQI
4th Aug 20254811 AMAQI
4th Aug 20254612 PMAQI
4th Aug 2025421 PMAQI
4th Aug 2025422 PMAQI
4th Aug 2025393 PMAQI
4th Aug 2025414 PMAQI
4th Aug 2025445 PMAQI
4th Aug 2025426 PMAQI
4th Aug 2025367 PMAQI
4th Aug 2025428 PMAQI
4th Aug 2025519 PMAQI
4th Aug 20255410 PMAQI
4th Aug 20255411 PMAQI
5th Aug 20255312 AMAQI
5th Aug 2025521 AMAQI
5th Aug 2025502 AMAQI
5th Aug 2025523 AMAQI
5th Aug 2025484 AMAQI
27°C17/37°C
5th Aug 2025515 AMAQI
5th Aug 2025536 AMAQI
5th Aug 2025547 AMAQI
5th Aug 2025598 AMAQI
5th Aug 2025649 AMAQI
5th Aug 20258010 AMAQI
5th Aug 20257711 AMAQI
5th Aug 20256512 PMAQI
5th Aug 2025641 PMAQI
5th Aug 2025592 PMAQI
5th Aug 2025603 PMAQI
5th Aug 2025584 PMAQI
5th Aug 2025565 PMAQI
5th Aug 2025506 PMAQI
5th Aug 2025557 PMAQI
5th Aug 2025518 PMAQI
5th Aug 2025529 PMAQI
5th Aug 20255510 PMAQI
5th Aug 20255611 PMAQI
6th Aug 20255812 AMAQI
6th Aug 2025661 AMAQI
6th Aug 2025842 AMAQI
6th Aug 20251043 AMAQI
6th Aug 20251124 AMAQI
29°C18/38°C
6th Aug 20251075 AMAQI
6th Aug 20251146 AMAQI
6th Aug 2025977 AMAQI
6th Aug 2025868 AMAQI
6th Aug 2025859 AMAQI
6th Aug 20258810 AMAQI
6th Aug 20258511 AMAQI
6th Aug 20258212 PMAQI
6th Aug 2025781 PMAQI
6th Aug 2025702 PMAQI
6th Aug 2025653 PMAQI
6th Aug 2025594 PMAQI
6th Aug 2025565 PMAQI
6th Aug 2025566 PMAQI
6th Aug 2025727 PMAQI
6th Aug 2025648 PMAQI
6th Aug 2025549 PMAQI
6th Aug 20255210 PMAQI
6th Aug 20255211 PMAQI
7th Aug 20256312 AMAQI
7th Aug 2025741 AMAQI
7th Aug 2025742 AMAQI
7th Aug 2025753 AMAQI
7th Aug 2025764 AMAQI
28°C20/38°C
7th Aug 2025605 AMAQI
7th Aug 2025546 AMAQI
7th Aug 2025567 AMAQI
7th Aug 2025598 AMAQI
7th Aug 2025669 AMAQI
7th Aug 20257310 AMAQI
7th Aug 20256211 AMAQI
7th Aug 20255812 PMAQI
7th Aug 2025561 PMAQI
7th Aug 2025592 PMAQI
7th Aug 2025603 PMAQI
7th Aug 2025594 PMAQI
7th Aug 2025575 PMAQI
7th Aug 2025566 PMAQI
7th Aug 2025617 PMAQI
7th Aug 2025618 PMAQI
7th Aug 2025599 PMAQI
7th Aug 20256010 PMAQI
7th Aug 20255811 PMAQI
8th Aug 20255912 AMAQI
8th Aug 2025601 AMAQI
8th Aug 2025622 AMAQI
8th Aug 2025623 AMAQI
8th Aug 2025614 AMAQI
30°C20/39°C
8th Aug 2025545 AMAQI
8th Aug 2025516 AMAQI
8th Aug 2025537 AMAQI
8th Aug 2025558 AMAQI
8th Aug 2025569 AMAQI
8th Aug 20256010 AMAQI
8th Aug 20255911 AMAQI
8th Aug 20255712 PMAQI
8th Aug 2025561 PMAQI
8th Aug 2025572 PMAQI
8th Aug 2025563 PMAQI
8th Aug 2025564 PMAQI
8th Aug 2025565 PMAQI
8th Aug 2025566 PMAQI
8th Aug 2025577 PMAQI
8th Aug 2025568 PMAQI
8th Aug 2025549 PMAQI
8th Aug 20255410 PMAQI
8th Aug 20255411 PMAQI
9th Aug 20255412 AMAQI
9th Aug 2025551 AMAQI
9th Aug 2025562 AMAQI
9th Aug 2025553 AMAQI
9th Aug 2025554 AMAQI
29°C20/38°C
9th Aug 2025435 AMAQI
9th Aug 2025426 AMAQI
9th Aug 2025467 AMAQI
9th Aug 2025448 AMAQI
9th Aug 2025469 AMAQI
9th Aug 20255010 AMAQI
9th Aug 20254811 AMAQI
9th Aug 20254812 PMAQI
9th Aug 2025481 PMAQI
9th Aug 2025482 PMAQI
9th Aug 2025523 PMAQI
9th Aug 2025544 PMAQI
9th Aug 2025545 PMAQI
9th Aug 2025546 PMAQI
9th Aug 2025527 PMAQI
9th Aug 2025518 PMAQI
9th Aug 2025529 PMAQI
9th Aug 20255210 PMAQI
9th Aug 20255211 PMAQI
10th Aug 20255012 AMAQI
10th Aug 2025521 AMAQI
10th Aug 2025522 AMAQI
10th Aug 2025523 AMAQI
10th Aug 2025474 AMAQI
25°C19/33°C
10th Aug 2025435 AMAQI
5 AM10th Aug 2025406 AMAQI
12 PM
8 PM
12 AM
4 AM
--°C/°C
Day time
Avg. Highest Time
9 AM - 8 PM
45AQI
12 hours / Day
360 hours / Month
Avg. Lowest Time
5 AM - 8 AM
43AQI
4 hours / Day
120 hours / Month
In the last 30 days, during the daytime, the highest AQI was between 9 AM to 8 PM (Avg. 45), while the lowest AQI was between 5 AM to 8 AM (Avg. 43).
Night time
Avg. Highest Time
12 AM - 11 PM
44AQI
8 hours / Day
240 hours / Month
Avg. Lowest Time
12 AM - 11 PM
44AQI
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. 44), while the lowest AQI was between 12 AM to 11 PM (Avg. 44).
2025 Days Vs Air Quality
Welby, Colorado, United States
2025
91%
202
9%
19
Total number of days with different AQI categories in last 222 days in 2025 (143 days remaining)
Good
202 DaysModerate
19 DaysPoor
0 DaysUnhealthy
0 DaysSevere
0 DaysHazardous
0 DaysUnder WHO’s Safe Air Quality Limits: 91%
Health Risk Level:
Very Low
In 2025, 91% of 222 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
Welby, 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
40AQI
40AQI
2nd January 2025
39AQI
39AQI
3rd January 2025
52AQI
52AQI
4th January 2025
43AQI
43AQI
5th January 2025
30AQI
30AQI
6th January 2025
46AQI
46AQI
7th January 2025
37AQI
37AQI
8th January 2025
47AQI
47AQI
9th January 2025
35AQI
35AQI
10th January 2025
35AQI
35AQI
11th January 2025
23AQI
23AQI
12th January 2025
25AQI
25AQI
13th January 2025
27AQI
27AQI
14th January 2025
27AQI
27AQI
15th January 2025
39AQI
39AQI
16th January 2025
55AQI
55AQI
17th January 2025
49AQI
49AQI
18th January 2025
20AQI
20AQI
19th January 2025
32AQI
32AQI
20th January 2025
27AQI
27AQI
21st January 2025
30AQI
30AQI
22nd January 2025
24AQI
24AQI
23rd January 2025
30AQI
30AQI
24th January 2025
28AQI
28AQI
25th January 2025
23AQI
23AQI
26th January 2025
40AQI
40AQI
27th January 2025
61AQI
61AQI
28th January 2025
57AQI
57AQI
29th January 2025
52AQI
52AQI
30th January 2025
41AQI
41AQI
31st January 2025
39AQI
39AQI
1st February 2025
28AQI
28AQI
2nd February 2025
25AQI
25AQI
3rd February 2025
27AQI
27AQI
4th February 2025
49AQI
49AQI
5th February 2025
54AQI
54AQI
6th February 2025
24AQI
24AQI
7th February 2025
42AQI
42AQI
8th February 2025
28AQI
28AQI
9th February 2025
25AQI
25AQI
10th February 2025
27AQI
27AQI
11th February 2025
36AQI
36AQI
12th February 2025
34AQI
34AQI
13th February 2025
49AQI
49AQI
14th February 2025
56AQI
56AQI
15th February 2025
37AQI
37AQI
16th February 2025
46AQI
46AQI
17th February 2025
44AQI
44AQI
18th February 2025
34AQI
34AQI
19th February 2025
33AQI
33AQI
20th February 2025
46AQI
46AQI
21st February 2025
34AQI
34AQI
22nd February 2025
33AQI
33AQI
23rd February 2025
20AQI
20AQI
24th February 2025
18AQI
18AQI
25th February 2025
21AQI
21AQI
26th February 2025
18AQI
18AQI
27th February 2025
23AQI
23AQI
28th February 2025
29AQI
29AQI
1st March 2025
26AQI
26AQI
2nd March 2025
25AQI
25AQI
3rd March 2025
31AQI
31AQI
4th March 2025
23AQI
23AQI
5th March 2025
17AQI
17AQI
6th March 2025
23AQI
23AQI
7th March 2025
17AQI
17AQI
8th March 2025
27AQI
27AQI
9th March 2025
23AQI
23AQI
10th March 2025
26AQI
26AQI
11th March 2025
28AQI
28AQI
12th March 2025
25AQI
25AQI
13th March 2025
32AQI
32AQI
14th March 2025
30AQI
30AQI
15th March 2025
21AQI
21AQI
16th March 2025
20AQI
20AQI
17th March 2025
29AQI
29AQI
18th March 2025
36AQI
36AQI
19th March 2025
18AQI
18AQI
20th March 2025
24AQI
24AQI
21st March 2025
21AQI
21AQI
22nd March 2025
22AQI
22AQI
23rd March 2025
17AQI
17AQI
24th March 2025
27AQI
27AQI
25th March 2025
22AQI
22AQI
26th March 2025
30AQI
30AQI
27th March 2025
38AQI
38AQI
28th March 2025
35AQI
35AQI
29th March 2025
20AQI
20AQI
30th March 2025
22AQI
22AQI
31st March 2025
41AQI
41AQI
1st April 2025
29AQI
29AQI
2nd April 2025
18AQI
18AQI
3rd April 2025
21AQI
21AQI
4th April 2025
22AQI
22AQI
5th April 2025
26AQI
26AQI
6th April 2025
26AQI
26AQI
7th April 2025
30AQI
30AQI
8th April 2025
36AQI
36AQI
9th April 2025
41AQI
41AQI
10th April 2025
45AQI
45AQI
11th April 2025
47AQI
47AQI
12th April 2025
36AQI
36AQI
13th April 2025
26AQI
26AQI
14th April 2025
18AQI
18AQI
15th April 2025
35AQI
35AQI
16th April 2025
33AQI
33AQI
17th April 2025
34AQI
34AQI
18th April 2025
12AQI
12AQI
19th April 2025
21AQI
21AQI
20th April 2025
24AQI
24AQI
21st April 2025
20AQI
20AQI
22nd April 2025
24AQI
24AQI
23rd April 2025
32AQI
32AQI
24th April 2025
53AQI
53AQI
25th April 2025
24AQI
24AQI
26th April 2025
25AQI
25AQI
27th April 2025
33AQI
33AQI
28th April 2025
18AQI
18AQI
29th April 2025
20AQI
20AQI
30th April 2025
22AQI
22AQI
1st May 2025
16AQI
16AQI
2nd May 2025
21AQI
21AQI
3rd May 2025
24AQI
24AQI
4th May 2025
24AQI
24AQI
5th May 2025
22AQI
22AQI
6th May 2025
18AQI
18AQI
7th May 2025
21AQI
21AQI
8th May 2025
31AQI
31AQI
9th May 2025
30AQI
30AQI
10th May 2025
30AQI
30AQI
11th May 2025
24AQI
24AQI
12th May 2025
28AQI
28AQI
13th May 2025
37AQI
37AQI
14th May 2025
38AQI
38AQI
15th May 2025
16AQI
16AQI
16th May 2025
17AQI
17AQI
17th May 2025
18AQI
18AQI
18th May 2025
30AQI
30AQI
19th May 2025
14AQI
14AQI
20th May 2025
17AQI
17AQI
21st May 2025
19AQI
19AQI
22nd May 2025
27AQI
27AQI
23rd May 2025
31AQI
31AQI
24th May 2025
40AQI
40AQI
25th May 2025
16AQI
16AQI
26th May 2025
18AQI
18AQI
27th May 2025
31AQI
31AQI
28th May 2025
22AQI
22AQI
29th May 2025
19AQI
19AQI
30th May 2025
25AQI
25AQI
31st May 2025
27AQI
27AQI
1st June 2025
29AQI
29AQI
2nd June 2025
25AQI
25AQI
3rd June 2025
18AQI
18AQI
4th June 2025
32AQI
32AQI
5th June 2025
35AQI
35AQI
6th June 2025
27AQI
27AQI
7th June 2025
23AQI
23AQI
8th June 2025
30AQI
30AQI
9th June 2025
51AQI
51AQI
10th June 2025
44AQI
44AQI
11th June 2025
30AQI
30AQI
12th June 2025
31AQI
31AQI
13th June 2025
31AQI
31AQI
14th June 2025
33AQI
33AQI
15th June 2025
28AQI
28AQI
16th June 2025
33AQI
33AQI
17th June 2025
30AQI
30AQI
18th June 2025
28AQI
28AQI
19th June 2025
32AQI
32AQI
20th June 2025
36AQI
36AQI
21st June 2025
38AQI
38AQI
22nd June 2025
38AQI
38AQI
23rd June 2025
37AQI
37AQI
24th June 2025
46AQI
46AQI
25th June 2025
38AQI
38AQI
26th June 2025
31AQI
31AQI
27th June 2025
32AQI
32AQI
28th June 2025
37AQI
37AQI
29th June 2025
36AQI
36AQI
30th June 2025
32AQI
32AQI
1st July 2025
35AQI
35AQI
2nd July 2025
32AQI
32AQI
3rd July 2025
29AQI
29AQI
4th July 2025
26AQI
26AQI
5th July 2025
42AQI
42AQI
6th July 2025
31AQI
31AQI
7th July 2025
30AQI
30AQI
8th July 2025
34AQI
34AQI
9th July 2025
36AQI
36AQI
10th July 2025
38AQI
38AQI
11th July 2025
40AQI
40AQI
12th July 2025
57AQI
57AQI
13th July 2025
51AQI
51AQI
14th July 2025
40AQI
40AQI
15th July 2025
37AQI
37AQI
16th July 2025
42AQI
42AQI
17th July 2025
48AQI
48AQI
18th July 2025
51AQI
51AQI
19th July 2025
50AQI
50AQI
20th July 2025
39AQI
39AQI
21st July 2025
34AQI
34AQI
22nd July 2025
32AQI
32AQI
23rd July 2025
27AQI
27AQI
24th July 2025
30AQI
30AQI
25th July 2025
34AQI
34AQI
26th July 2025
40AQI
40AQI
27th July 2025
32AQI
32AQI
28th July 2025
36AQI
36AQI
29th July 2025
46AQI
46AQI
30th July 2025
42AQI
42AQI
31st July 2025
54AQI
54AQI
1st August 2025
54AQI
54AQI
2nd August 2025
38AQI
38AQI
3rd August 2025
26AQI
26AQI
4th August 2025
38AQI
38AQI
5th August 2025
56AQI
56AQI
6th August 2025
77AQI
77AQI
7th August 2025
63AQI
63AQI
8th August 2025
57AQI
57AQI
9th August 2025
51AQI
51AQI
37AQI
34AQI
26AQI
28AQI
24AQI
33AQI
39AQI
51AQI
No. of days
Jan.Feb.Mar.Apr.MayJun.Jul.Aug.Sep.Oct.Nov.Dec.Total Days
202532AQI
26
5
26
2
31
29
1
31
29
1
27
4
3
6
202
19
Highest AQI recorded in
August51AQI
Lowest AQI recorded in
May24AQI
202456AQI
31
29
31
30
31
30
31
26
5
23
4
17
14
26
4
26
5
118
245
Highest AQI recorded in
June70AQI
Lowest AQI recorded in
November28AQI
202366AQI
31
28
31
30
31
30
31
31
30
31
1
27
13
18
14
349
Highest AQI recorded in
July70AQI
Lowest AQI recorded in
December40AQI
202270AQI
30
22
31
17
30
29
20
3
29
31
30
29
301
Highest AQI recorded in
April73AQI
Lowest AQI recorded in
November68AQI
202154AQI
30
28
30
1
30
9
17
27
31
31
24
31
30
31
127
223
Highest AQI recorded in
June71AQI
Lowest AQI recorded in
February22AQI
202040AQI
13
19
1
19
26
4
24
7
13
18
13
16
1
18
13
27
2
29
2
201
63
1
Highest AQI recorded in
August57AQI
Lowest AQI recorded in
December25AQI
Most & Least Polluted Years Over the Last 6 Years
Most Polluted Year Recorded
2022(Avg.)
70AQILeast Polluted Year Recorded
2025(Avg.)
32AQIWelby's annual 2025 AQI (32) shows an average percentage change of -41.3% (improved AQI) compared to previous years: 2020 (40), 2021 (54), 2022 (70), 2023 (66), 2024 (56).
