Country Background
HistoryAQIPM₂.₅PM₁₀COSO₂NO₂O₃

Boulder, 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

Boulder, Colorado, United States

2022
2023
2024
2025
2026
AQI
.
Days

AQI Trends: Highest and Lowest

Highest AQI recorded on
21st Aug 2023
85AQI
Lowest AQI recorded on
18th Aug 2024
14AQI

Same Day Analysis (12th August):
On this day, AQI across the 5 years varied significantly: 2026 ranks 3rd highest AQI at 28 of Good air quality, showing improvement over 2025 and 2024 on the same day.

Day & Night AQI Trend: 12th Aug - 13th Aug 2026

Boulder, Colorado, United States

AQI
Day
Night
.

5 AM12th Aug 2026

8 PM

4 AM13th Aug 2026

Day time
Avg. Highest Time
9AM12th Aug

35AQI

Avg. Lowest Time
7AM12th Aug

25AQI

Night time
Avg. Highest Time
12AM13th Aug

35AQI

Avg. Lowest Time
11PM12th Aug

23AQI

In the last 24 hours,

Boulder's AQI reached its highest point of 35 at 9 AM during the Day, while the lowest point, 23, was recorded at 11 PM during the Night between 12th Aug and 13th Aug 2026.

Day & Night AQI Trend : Jul - Aug 2026

Boulder, Colorado, United States

JulAug
15th - 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 - 11th11th - 12th12th - 13th13th
Day
Night
15th Jul 2026155 AMAQI
15th Jul 2026146 AMAQI
15th Jul 2026147 AMAQI
15th Jul 2026188 AMAQI
15th Jul 2026209 AMAQI
15th Jul 20262210 AMAQI
15th Jul 20262411 AMAQI
15th Jul 20262512 PMAQI
15th Jul 2026271 PMAQI
15th Jul 2026292 PMAQI
15th Jul 2026303 PMAQI
15th Jul 2026304 PMAQI
15th Jul 2026305 PMAQI
15th Jul 2026276 PMAQI
15th Jul 2026267 PMAQI
15th Jul 2026268 PMAQI
15th Jul 2026249 PMAQI
15th Jul 20262510 PMAQI
15th Jul 20262311 PMAQI
16th Jul 20262412 AMAQI
16th Jul 2026241 AMAQI
16th Jul 2026202 AMAQI
16th Jul 2026193 AMAQI
16th Jul 2026174 AMAQI

24°C14/33°C

16th Jul 2026165 AMAQI
16th Jul 2026176 AMAQI
16th Jul 2026177 AMAQI
16th Jul 2026208 AMAQI
16th Jul 2026219 AMAQI
16th Jul 20262710 AMAQI
16th Jul 20262811 AMAQI
16th Jul 20263012 PMAQI
16th Jul 2026301 PMAQI
16th Jul 2026282 PMAQI
16th Jul 2026323 PMAQI
16th Jul 2026334 PMAQI
16th Jul 2026345 PMAQI
16th Jul 2026316 PMAQI
16th Jul 2026277 PMAQI
16th Jul 2026278 PMAQI
16th Jul 2026279 PMAQI
16th Jul 20262210 PMAQI
16th Jul 20261411 PMAQI
17th Jul 20261212 AMAQI
17th Jul 2026151 AMAQI
17th Jul 2026202 AMAQI
17th Jul 2026243 AMAQI
17th Jul 2026204 AMAQI

23°C15/33°C

17th Jul 2026255 AMAQI
17th Jul 2026296 AMAQI
17th Jul 2026307 AMAQI
17th Jul 2026298 AMAQI
17th Jul 2026269 AMAQI
17th Jul 20263010 AMAQI
17th Jul 20262511 AMAQI
17th Jul 20263212 PMAQI
17th Jul 2026321 PMAQI
17th Jul 2026332 PMAQI
17th Jul 2026323 PMAQI
17th Jul 2026334 PMAQI
17th Jul 2026335 PMAQI
17th Jul 2026266 PMAQI
17th Jul 2026207 PMAQI
17th Jul 2026318 PMAQI
17th Jul 2026339 PMAQI
17th Jul 20263410 PMAQI
17th Jul 20263311 PMAQI
18th Jul 20263312 AMAQI
18th Jul 2026281 AMAQI
18th Jul 2026302 AMAQI
18th Jul 2026303 AMAQI
18th Jul 2026304 AMAQI

24°C15/32°C

18th Jul 2026305 AMAQI
18th Jul 2026306 AMAQI
18th Jul 2026297 AMAQI
18th Jul 2026308 AMAQI
18th Jul 2026309 AMAQI
18th Jul 20263010 AMAQI
18th Jul 20263511 AMAQI
18th Jul 20263512 PMAQI
18th Jul 2026301 PMAQI
18th Jul 2026422 PMAQI
18th Jul 2026433 PMAQI
18th Jul 2026424 PMAQI
18th Jul 2026415 PMAQI
18th Jul 2026416 PMAQI
18th Jul 2026397 PMAQI
18th Jul 2026358 PMAQI
18th Jul 2026359 PMAQI
18th Jul 20263710 PMAQI
18th Jul 20262511 PMAQI
19th Jul 20263012 AMAQI
19th Jul 2026321 AMAQI
19th Jul 2026302 AMAQI
19th Jul 2026303 AMAQI
19th Jul 2026354 AMAQI

25°C15/33°C

19th Jul 2026335 AMAQI
19th Jul 2026326 AMAQI
19th Jul 2026267 AMAQI
19th Jul 2026328 AMAQI
19th Jul 2026259 AMAQI
19th Jul 20262810 AMAQI
19th Jul 20263711 AMAQI
19th Jul 20263112 PMAQI
19th Jul 2026291 PMAQI
19th Jul 2026252 PMAQI
19th Jul 2026293 PMAQI
19th Jul 2026244 PMAQI
19th Jul 2026295 PMAQI
19th Jul 2026246 PMAQI
19th Jul 2026207 PMAQI
19th Jul 2026308 PMAQI
19th Jul 2026309 PMAQI
19th Jul 20262510 PMAQI
19th Jul 20262511 PMAQI
20th Jul 20262912 AMAQI
20th Jul 2026291 AMAQI
20th Jul 2026272 AMAQI
20th Jul 2026293 AMAQI
20th Jul 2026304 AMAQI

25°C15/35°C

20th Jul 2026285 AMAQI
20th Jul 2026256 AMAQI
20th Jul 2026287 AMAQI
20th Jul 2026268 AMAQI
20th Jul 2026329 AMAQI
20th Jul 20262610 AMAQI
20th Jul 20262911 AMAQI
20th Jul 20263912 PMAQI
20th Jul 2026451 PMAQI
20th Jul 2026462 PMAQI
20th Jul 2026433 PMAQI
20th Jul 2026434 PMAQI
20th Jul 2026355 PMAQI
20th Jul 2026336 PMAQI
20th Jul 2026397 PMAQI
20th Jul 2026448 PMAQI
20th Jul 20264110 PMAQI
20th Jul 20264311 PMAQI
21st Jul 20264612 AMAQI
21st Jul 2026431 AMAQI
21st Jul 2026392 AMAQI
21st Jul 2026413 AMAQI
21st Jul 2026334 AMAQI

26°C18/37°C

21st Jul 2026285 AMAQI
21st Jul 2026316 AMAQI
21st Jul 2026327 AMAQI
21st Jul 2026408 AMAQI
21st Jul 2026439 AMAQI
21st Jul 20264610 AMAQI
21st Jul 20264711 AMAQI
21st Jul 20264612 PMAQI
21st Jul 2026401 PMAQI
21st Jul 2026402 PMAQI
21st Jul 2026353 PMAQI
21st Jul 2026384 PMAQI
21st Jul 2026345 PMAQI
21st Jul 2026316 PMAQI
21st Jul 2026307 PMAQI
21st Jul 2026278 PMAQI
21st Jul 2026319 PMAQI
21st Jul 20262910 PMAQI
21st Jul 20262511 PMAQI
22nd Jul 20263312 AMAQI
22nd Jul 2026331 AMAQI
22nd Jul 2026252 AMAQI
22nd Jul 2026323 AMAQI
22nd Jul 2026294 AMAQI

26°C19/35°C

22nd Jul 2026305 AMAQI
22nd Jul 2026306 AMAQI
22nd Jul 2026307 AMAQI
22nd Jul 2026328 AMAQI
22nd Jul 2026339 AMAQI
22nd Jul 20263510 AMAQI
22nd Jul 20262711 AMAQI
22nd Jul 20262712 PMAQI
22nd Jul 2026261 PMAQI
22nd Jul 2026262 PMAQI
22nd Jul 2026263 PMAQI
22nd Jul 2026244 PMAQI
22nd Jul 2026255 PMAQI
22nd Jul 2026246 PMAQI
22nd Jul 2026257 PMAQI
22nd Jul 2026258 PMAQI
22nd Jul 2026269 PMAQI
22nd Jul 20263210 PMAQI
22nd Jul 20263911 PMAQI
23rd Jul 20263212 AMAQI
23rd Jul 2026351 AMAQI
23rd Jul 2026292 AMAQI
23rd Jul 2026313 AMAQI
23rd Jul 2026374 AMAQI

22°C16/32°C

23rd Jul 2026335 AMAQI
23rd Jul 2026356 AMAQI
23rd Jul 2026297 AMAQI
23rd Jul 2026328 AMAQI
23rd Jul 2026329 AMAQI
23rd Jul 20263310 AMAQI
23rd Jul 20263311 AMAQI
23rd Jul 20263612 PMAQI
23rd Jul 2026371 PMAQI
23rd Jul 2026322 PMAQI
23rd Jul 2026283 PMAQI
23rd Jul 2026274 PMAQI
23rd Jul 2026265 PMAQI
23rd Jul 2026186 PMAQI
23rd Jul 2026207 PMAQI
23rd Jul 2026258 PMAQI
23rd Jul 2026339 PMAQI
23rd Jul 20263210 PMAQI
23rd Jul 20263911 PMAQI
24th Jul 20263712 AMAQI
24th Jul 2026251 AMAQI
24th Jul 2026332 AMAQI
24th Jul 2026333 AMAQI
24th Jul 2026324 AMAQI

22°C16/29°C

24th Jul 2026335 AMAQI
24th Jul 2026326 AMAQI
24th Jul 2026337 AMAQI
24th Jul 2026308 AMAQI
24th Jul 2026309 AMAQI
24th Jul 20263310 AMAQI
24th Jul 20262911 AMAQI
24th Jul 20263212 PMAQI
24th Jul 2026321 PMAQI
24th Jul 2026292 PMAQI
24th Jul 2026343 PMAQI
24th Jul 2026324 PMAQI
24th Jul 2026335 PMAQI
24th Jul 2026276 PMAQI
24th Jul 2026307 PMAQI
24th Jul 2026398 PMAQI
24th Jul 2026309 PMAQI
24th Jul 20263210 PMAQI
24th Jul 20263211 PMAQI
25th Jul 20262812 AMAQI
25th Jul 2026311 AMAQI
25th Jul 2026332 AMAQI
25th Jul 2026353 AMAQI
25th Jul 2026304 AMAQI

25°C16/34°C

25th Jul 2026305 AMAQI
25th Jul 2026306 AMAQI
25th Jul 2026287 AMAQI
25th Jul 2026308 AMAQI
25th Jul 2026309 AMAQI
25th Jul 20263010 AMAQI
25th Jul 20264611 AMAQI
25th Jul 20263712 PMAQI
25th Jul 2026281 PMAQI
25th Jul 2026252 PMAQI
25th Jul 2026163 PMAQI
25th Jul 2026254 PMAQI
25th Jul 2026275 PMAQI
25th Jul 2026276 PMAQI
25th Jul 2026257 PMAQI
25th Jul 2026298 PMAQI
25th Jul 2026259 PMAQI
25th Jul 20262510 PMAQI
25th Jul 20262511 PMAQI
26th Jul 20262812 AMAQI
26th Jul 2026121 AMAQI
26th Jul 2026182 AMAQI
26th Jul 2026253 AMAQI
26th Jul 2026294 AMAQI

26°C18/36°C

26th Jul 2026245 AMAQI
26th Jul 2026306 AMAQI
26th Jul 2026307 AMAQI
26th Jul 2026308 AMAQI
26th Jul 2026299 AMAQI
26th Jul 20263010 AMAQI
26th Jul 20263011 AMAQI
26th Jul 20263212 PMAQI
26th Jul 2026301 PMAQI
26th Jul 2026252 PMAQI
26th Jul 2026223 PMAQI
26th Jul 2026124 PMAQI
26th Jul 2026305 PMAQI
26th Jul 2026196 PMAQI
26th Jul 2026287 PMAQI
26th Jul 2026308 PMAQI
26th Jul 2026309 PMAQI
26th Jul 20263010 PMAQI
26th Jul 20262911 PMAQI
27th Jul 20263012 AMAQI
27th Jul 2026301 AMAQI
27th Jul 2026282 AMAQI
27th Jul 2026123 AMAQI
27th Jul 2026154 AMAQI

27°C21/36°C

27th Jul 2026145 AMAQI
27th Jul 2026186 AMAQI
27th Jul 2026257 AMAQI
27th Jul 2026328 AMAQI
27th Jul 2026259 AMAQI
27th Jul 20262910 AMAQI
27th Jul 20262811 AMAQI
27th Jul 20263412 PMAQI
27th Jul 2026251 PMAQI
27th Jul 2026302 PMAQI
27th Jul 2026293 PMAQI
27th Jul 2026264 PMAQI
27th Jul 2026275 PMAQI
27th Jul 2026366 PMAQI
27th Jul 2026177 PMAQI
27th Jul 2026308 PMAQI
27th Jul 2026299 PMAQI
27th Jul 20262910 PMAQI
27th Jul 20262411 PMAQI
28th Jul 20263512 AMAQI
28th Jul 2026421 AMAQI
28th Jul 2026362 AMAQI
28th Jul 2026303 AMAQI
28th Jul 2026394 AMAQI

24°C19/32°C

28th Jul 2026285 AMAQI
28th Jul 2026356 AMAQI
28th Jul 2026317 AMAQI
28th Jul 2026438 AMAQI
28th Jul 2026259 AMAQI
28th Jul 20264310 AMAQI
28th Jul 20263211 AMAQI
28th Jul 20263512 PMAQI
28th Jul 2026451 PMAQI
28th Jul 2026432 PMAQI
28th Jul 2026313 PMAQI
28th Jul 2026314 PMAQI
28th Jul 2026325 PMAQI
28th Jul 2026396 PMAQI
28th Jul 2026257 PMAQI
28th Jul 2026308 PMAQI
28th Jul 2026299 PMAQI
28th Jul 20262910 PMAQI
28th Jul 20262911 PMAQI
29th Jul 20263012 AMAQI
29th Jul 2026321 AMAQI
29th Jul 2026322 AMAQI
29th Jul 2026393 AMAQI
29th Jul 2026414 AMAQI

22°C16/32°C

29th Jul 2026475 AMAQI
29th Jul 2026566 AMAQI
29th Jul 2026317 AMAQI
29th Jul 2026418 AMAQI
29th Jul 2026449 AMAQI
29th Jul 20264310 AMAQI
29th Jul 20262911 AMAQI
29th Jul 20262412 PMAQI
29th Jul 2026321 PMAQI
29th Jul 2026322 PMAQI
29th Jul 2026273 PMAQI
29th Jul 2026324 PMAQI
29th Jul 2026185 PMAQI
29th Jul 2026306 PMAQI
29th Jul 2026377 PMAQI
29th Jul 2026298 PMAQI
29th Jul 2026239 PMAQI
29th Jul 20263410 PMAQI
29th Jul 20265211 PMAQI
30th Jul 20264412 AMAQI
30th Jul 2026301 AMAQI
30th Jul 2026442 AMAQI
30th Jul 2026393 AMAQI
30th Jul 2026274 AMAQI

21°C16/31°C

30th Jul 2026255 AMAQI
30th Jul 2026216 AMAQI
30th Jul 2026257 AMAQI
30th Jul 2026278 AMAQI
30th Jul 2026279 AMAQI
30th Jul 20264610 AMAQI
30th Jul 20262411 AMAQI
30th Jul 20262412 PMAQI
30th Jul 2026251 PMAQI
30th Jul 2026262 PMAQI
30th Jul 2026263 PMAQI
30th Jul 2026304 PMAQI
30th Jul 2026295 PMAQI
30th Jul 2026296 PMAQI
30th Jul 2026307 PMAQI
30th Jul 2026308 PMAQI
30th Jul 2026309 PMAQI
30th Jul 20263010 PMAQI
30th Jul 20262911 PMAQI
31st Jul 20263012 AMAQI
31st Jul 2026251 AMAQI
31st Jul 2026262 AMAQI
31st Jul 2026243 AMAQI
31st Jul 2026284 AMAQI

24°C16/33°C

31st Jul 2026285 AMAQI
31st Jul 2026276 AMAQI
31st Jul 2026287 AMAQI
31st Jul 2026308 AMAQI
31st Jul 2026349 AMAQI
31st Jul 20262810 AMAQI
31st Jul 20262811 AMAQI
31st Jul 20262812 PMAQI
31st Jul 2026281 PMAQI
31st Jul 2026302 PMAQI
31st Jul 2026283 PMAQI
31st Jul 2026284 PMAQI
31st Jul 2026305 PMAQI
31st Jul 2026306 PMAQI
31st Jul 2026307 PMAQI
31st Jul 2026308 PMAQI
31st Jul 2026319 PMAQI
31st Jul 20263110 PMAQI
31st Jul 20263111 PMAQI
1st Aug 20263112 AMAQI
1st Aug 2026311 AMAQI
1st Aug 2026312 AMAQI
1st Aug 2026303 AMAQI
1st Aug 2026344 AMAQI

21°C15/32°C

1st Aug 2026355 AMAQI
1st Aug 2026336 AMAQI
1st Aug 2026317 AMAQI
1st Aug 2026318 AMAQI
1st Aug 2026319 AMAQI
1st Aug 20263410 AMAQI
1st Aug 20263311 AMAQI
1st Aug 20263512 PMAQI
1st Aug 2026351 PMAQI
1st Aug 2026352 PMAQI
1st Aug 2026353 PMAQI
1st Aug 2026304 PMAQI
1st Aug 2026265 PMAQI
1st Aug 2026306 PMAQI
1st Aug 2026267 PMAQI
1st Aug 2026268 PMAQI
1st Aug 2026289 PMAQI
1st Aug 20262610 PMAQI
1st Aug 20262411 PMAQI
2nd Aug 20262612 AMAQI
2nd Aug 2026251 AMAQI
2nd Aug 2026262 AMAQI
2nd Aug 2026293 AMAQI
2nd Aug 2026294 AMAQI

23°C14/33°C

2nd Aug 2026285 AMAQI
2nd Aug 2026286 AMAQI
2nd Aug 2026297 AMAQI
2nd Aug 2026278 AMAQI
2nd Aug 2026269 AMAQI
2nd Aug 20262810 AMAQI
2nd Aug 20262811 AMAQI
2nd Aug 20263012 PMAQI
2nd Aug 2026281 PMAQI
2nd Aug 2026282 PMAQI
2nd Aug 2026283 PMAQI
2nd Aug 2026254 PMAQI
2nd Aug 2026365 PMAQI
2nd Aug 2026296 PMAQI
2nd Aug 2026457 PMAQI
2nd Aug 2026438 PMAQI
2nd Aug 2026319 PMAQI
2nd Aug 20263010 PMAQI
2nd Aug 20262611 PMAQI
3rd Aug 20264312 AMAQI
3rd Aug 2026521 AMAQI
3rd Aug 2026562 AMAQI
3rd Aug 2026593 AMAQI
3rd Aug 2026624 AMAQI

27°C17/38°C

3rd Aug 2026655 AMAQI
3rd Aug 2026626 AMAQI
3rd Aug 2026627 AMAQI
3rd Aug 2026588 AMAQI
3rd Aug 2026599 AMAQI
3rd Aug 20265910 AMAQI
3rd Aug 20265511 AMAQI
3rd Aug 20265312 PMAQI
3rd Aug 2026531 PMAQI
3rd Aug 2026512 PMAQI
3rd Aug 2026513 PMAQI
3rd Aug 2026494 PMAQI
3rd Aug 2026535 PMAQI
3rd Aug 2026546 PMAQI
3rd Aug 2026607 PMAQI
3rd Aug 2026678 PMAQI
3rd Aug 2026739 PMAQI
3rd Aug 20267410 PMAQI
3rd Aug 20268311 PMAQI
4th Aug 20267512 AMAQI
4th Aug 2026691 AMAQI
4th Aug 2026662 AMAQI
4th Aug 2026633 AMAQI
4th Aug 2026634 AMAQI

26°C18/37°C

4th Aug 2026655 AMAQI
4th Aug 2026686 AMAQI
4th Aug 2026627 AMAQI
4th Aug 2026598 AMAQI
4th Aug 2026579 AMAQI
4th Aug 20265510 AMAQI
4th Aug 20265511 AMAQI
4th Aug 20265612 PMAQI
4th Aug 2026571 PMAQI
4th Aug 2026592 PMAQI
4th Aug 2026593 PMAQI
4th Aug 2026604 PMAQI
4th Aug 2026635 PMAQI
4th Aug 2026616 PMAQI
4th Aug 2026617 PMAQI
4th Aug 2026648 PMAQI
4th Aug 2026649 PMAQI
4th Aug 20266210 PMAQI
4th Aug 20265811 PMAQI
5th Aug 20265712 AMAQI
5th Aug 2026561 AMAQI
5th Aug 2026552 AMAQI
5th Aug 2026543 AMAQI
5th Aug 2026534 AMAQI

17°C12/24°C

5th Aug 2026535 AMAQI
5th Aug 2026526 AMAQI
5th Aug 2026537 AMAQI
5th Aug 2026518 AMAQI
5th Aug 2026539 AMAQI
5th Aug 20265310 AMAQI
5th Aug 20265211 AMAQI
5th Aug 20265312 PMAQI
5th Aug 2026541 PMAQI
5th Aug 2026552 PMAQI
5th Aug 2026543 PMAQI
5th Aug 2026544 PMAQI
5th Aug 2026545 PMAQI
5th Aug 2026546 PMAQI
5th Aug 2026537 PMAQI
5th Aug 2026528 PMAQI
5th Aug 2026529 PMAQI
5th Aug 20265310 PMAQI
5th Aug 20265311 PMAQI
6th Aug 20265212 AMAQI
6th Aug 2026501 AMAQI
6th Aug 2026522 AMAQI
6th Aug 2026523 AMAQI
6th Aug 2026494 AMAQI

19°C8/29°C

6th Aug 2026495 AMAQI
6th Aug 2026506 AMAQI
6th Aug 2026487 AMAQI
6th Aug 2026488 AMAQI
6th Aug 2026499 AMAQI
6th Aug 20264810 AMAQI
6th Aug 20265011 AMAQI
6th Aug 20264912 PMAQI
6th Aug 2026521 PMAQI
6th Aug 2026522 PMAQI
6th Aug 2026523 PMAQI
6th Aug 2026524 PMAQI
6th Aug 2026515 PMAQI
6th Aug 2026516 PMAQI
6th Aug 2026507 PMAQI
6th Aug 2026498 PMAQI
6th Aug 2026499 PMAQI
6th Aug 20265110 PMAQI
6th Aug 20265211 PMAQI
7th Aug 20265012 AMAQI
7th Aug 2026511 AMAQI
7th Aug 2026512 AMAQI
7th Aug 2026523 AMAQI
7th Aug 2026494 AMAQI

24°C13/35°C

7th Aug 2026505 AMAQI
7th Aug 2026496 AMAQI
7th Aug 2026507 AMAQI
7th Aug 2026508 AMAQI
7th Aug 2026549 AMAQI
7th Aug 20265410 AMAQI
7th Aug 20265511 AMAQI
7th Aug 20265612 PMAQI
7th Aug 2026561 PMAQI
7th Aug 2026562 PMAQI
7th Aug 2026563 PMAQI
7th Aug 2026554 PMAQI
7th Aug 2026555 PMAQI
7th Aug 2026566 PMAQI
7th Aug 2026577 PMAQI
7th Aug 2026558 PMAQI
7th Aug 2026579 PMAQI
7th Aug 20265610 PMAQI
7th Aug 20265511 PMAQI
8th Aug 20265612 AMAQI
8th Aug 2026571 AMAQI
8th Aug 2026552 AMAQI
8th Aug 2026563 AMAQI
8th Aug 2026574 AMAQI

25°C16/34°C

8th Aug 2026545 AMAQI
8th Aug 2026536 AMAQI
8th Aug 2026557 AMAQI
8th Aug 2026528 AMAQI
8th Aug 2026549 AMAQI
8th Aug 20265310 AMAQI
8th Aug 20265111 AMAQI
8th Aug 20264812 PMAQI
8th Aug 2026471 PMAQI
8th Aug 2026472 PMAQI
8th Aug 2026493 PMAQI
8th Aug 2026464 PMAQI
8th Aug 2026455 PMAQI
8th Aug 2026456 PMAQI
8th Aug 2026437 PMAQI
8th Aug 2026418 PMAQI
8th Aug 2026389 PMAQI
8th Aug 20263810 PMAQI
8th Aug 20263511 PMAQI
9th Aug 20263512 AMAQI
9th Aug 2026341 AMAQI
9th Aug 2026342 AMAQI
9th Aug 2026353 AMAQI
9th Aug 2026324 AMAQI

27°C17/37°C

9th Aug 2026325 AMAQI
9th Aug 2026326 AMAQI
9th Aug 2026317 AMAQI
9th Aug 2026308 AMAQI
9th Aug 2026309 AMAQI
9th Aug 20263010 AMAQI
9th Aug 20263211 AMAQI
9th Aug 20263112 PMAQI
9th Aug 2026301 PMAQI
9th Aug 2026322 PMAQI
9th Aug 2026323 PMAQI
9th Aug 2026334 PMAQI
9th Aug 2026345 PMAQI
9th Aug 2026346 PMAQI
9th Aug 2026357 PMAQI
9th Aug 2026358 PMAQI
9th Aug 2026379 PMAQI
9th Aug 20263510 PMAQI
9th Aug 20263511 PMAQI
10th Aug 20263612 AMAQI
10th Aug 2026371 AMAQI
10th Aug 2026382 AMAQI
10th Aug 2026393 AMAQI
10th Aug 2026394 AMAQI

26°C18/35°C

10th Aug 2026395 AMAQI
10th Aug 2026406 AMAQI
10th Aug 2026397 AMAQI
10th Aug 2026408 AMAQI
10th Aug 2026419 AMAQI
10th Aug 20264310 AMAQI
10th Aug 20264211 AMAQI
10th Aug 20264612 PMAQI
10th Aug 2026501 PMAQI
10th Aug 2026432 PMAQI
10th Aug 2026423 PMAQI
10th Aug 2026414 PMAQI
10th Aug 2026365 PMAQI
10th Aug 2026356 PMAQI
10th Aug 2026347 PMAQI
10th Aug 2026338 PMAQI
10th Aug 2026339 PMAQI
10th Aug 20263310 PMAQI
10th Aug 20263411 PMAQI
11th Aug 20263412 AMAQI
11th Aug 2026321 AMAQI
11th Aug 2026322 AMAQI
11th Aug 2026313 AMAQI
11th Aug 2026304 AMAQI

24°C17/33°C

11th Aug 2026305 AMAQI
11th Aug 2026316 AMAQI
11th Aug 2026357 AMAQI
11th Aug 2026308 AMAQI
11th Aug 2026319 AMAQI
11th Aug 20263310 AMAQI
11th Aug 20263111 AMAQI
11th Aug 20263112 PMAQI
11th Aug 2026321 PMAQI
11th Aug 2026312 PMAQI
11th Aug 2026323 PMAQI
11th Aug 2026324 PMAQI
11th Aug 2026315 PMAQI
11th Aug 2026326 PMAQI
11th Aug 2026307 PMAQI
11th Aug 2026278 PMAQI
11th Aug 2026259 PMAQI
11th Aug 20262510 PMAQI
11th Aug 20262511 PMAQI
12th Aug 20262612 AMAQI
12th Aug 2026271 AMAQI
12th Aug 2026282 AMAQI
12th Aug 2026263 AMAQI
12th Aug 2026274 AMAQI

25°C17/34°C

12th Aug 2026265 AMAQI
12th Aug 2026256 AMAQI
12th Aug 2026257 AMAQI
12th Aug 2026308 AMAQI
12th Aug 2026359 AMAQI
12th Aug 20263510 AMAQI
12th Aug 20263011 AMAQI
12th Aug 20262912 PMAQI
12th Aug 2026301 PMAQI
12th Aug 2026332 PMAQI
12th Aug 2026323 PMAQI
12th Aug 2026334 PMAQI
12th Aug 2026285 PMAQI
12th Aug 2026286 PMAQI
12th Aug 2026287 PMAQI
12th Aug 2026268 PMAQI
12th Aug 2026259 PMAQI
12th Aug 20262510 PMAQI
12th Aug 20262311 PMAQI
13th Aug 20263512 AMAQI
13th Aug 2026321 AMAQI
13th Aug 2026322 AMAQI
13th Aug 2026313 AMAQI
13th Aug 2026284 AMAQI

22°C15/32°C

13th Aug 2026325 AMAQI
5 AM
13th Aug 2026316 AMAQI
13th Aug 2026317 AMAQI
13th Aug 2026328 AMAQI
13th Aug 2026379 AMAQI
13th Aug 20263410 AMAQI
13th Aug 20262411 AMAQI
13th Aug 20262612 PMAQI
12 PM
13th Aug 2026331 PMAQI
13th Aug 2026332 PMAQI
13th Aug 2026323 PMAQI
13th Aug 2026314 PMAQI
13th Aug 2026295 PMAQI
8 PM
12 AM
4 AM

18°C13/25°C

Day time
Avg. Highest Time
10 AM - 8 PM

36AQI

11 hours / Day
330 hours / Month
Avg. Lowest Time
5 AM - 9 AM

35AQI

5 hours / Day
150 hours / Month
In the last 30 days, during the daytime, the highest AQI was between 10 AM to 8 PM (Avg. 36), while the lowest AQI was between 5 AM to 9 AM (Avg. 35).
Night time
Avg. Highest Time
12 AM - 11 PM

35AQI

8 hours / Day
240 hours / Month
Avg. Lowest Time
12 AM - 11 PM

35AQI

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. 35), while the lowest AQI was between 12 AM to 11 PM (Avg. 35).

2026 Days Vs Air Quality

Boulder, Colorado, United States

2026

98%

217

2%

4

Total number of days with different AQI categories in last 225 days in 2026 (140 days remaining)

Good
217 Days
Moderate
4 Days
Poor
0 Days
Unhealthy
0 Days
Severe
0 Days
Hazardous
0 Days

Under WHO’s Safe Air Quality Limits: 98%

Health Risk Level:

Very Low

In 2026, 98% of 225 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

Boulder, Colorado, United States

AQI levels in 2026

AQI (US)
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 2026
-1th undefined 2026
-1th undefined 2026
-1th undefined 2026
1st January 2026
23AQI (US)
2nd January 2026
26AQI (US)
3rd January 2026
29AQI (US)
4th January 2026
21AQI (US)
5th January 2026
24AQI (US)
6th January 2026
17AQI (US)
7th January 2026
18AQI (US)
8th January 2026
18AQI (US)
9th January 2026
18AQI (US)
10th January 2026
16AQI (US)
11th January 2026
17AQI (US)
12th January 2026
31AQI (US)
13th January 2026
23AQI (US)
14th January 2026
13AQI (US)
15th January 2026
22AQI (US)
16th January 2026
23AQI (US)
17th January 2026
12AQI (US)
18th January 2026
15AQI (US)
19th January 2026
21AQI (US)
20th January 2026
39AQI (US)
21st January 2026
20AQI (US)
22nd January 2026
25AQI (US)
23rd January 2026
22AQI (US)
24th January 2026
30AQI (US)
25th January 2026
21AQI (US)
26th January 2026
28AQI (US)
27th January 2026
22AQI (US)
28th January 2026
29AQI (US)
29th January 2026
31AQI (US)
30th January 2026
33AQI (US)
31st January 2026
24AQI (US)
1st February 2026
21AQI (US)
2nd February 2026
24AQI (US)
3rd February 2026
21AQI (US)
4th February 2026
28AQI (US)
5th February 2026
22AQI (US)
6th February 2026
21AQI (US)
7th February 2026
21AQI (US)
8th February 2026
27AQI (US)
9th February 2026
26AQI (US)
10th February 2026
23AQI (US)
11th February 2026
24AQI (US)
12th February 2026
25AQI (US)
13th February 2026
21AQI (US)
14th February 2026
27AQI (US)
15th February 2026
21AQI (US)
16th February 2026
22AQI (US)
17th February 2026
29AQI (US)
18th February 2026
19AQI (US)
19th February 2026
24AQI (US)
20th February 2026
18AQI (US)
21st February 2026
17AQI (US)
22nd February 2026
18AQI (US)
23rd February 2026
23AQI (US)
24th February 2026
30AQI (US)
25th February 2026
27AQI (US)
26th February 2026
18AQI (US)
27th February 2026
20AQI (US)
28th February 2026
18AQI (US)
1st March 2026
22AQI (US)
2nd March 2026
30AQI (US)
3rd March 2026
16AQI (US)
4th March 2026
19AQI (US)
5th March 2026
19AQI (US)
6th March 2026
29AQI (US)
7th March 2026
26AQI (US)
8th March 2026
27AQI (US)
9th March 2026
23AQI (US)
10th March 2026
21AQI (US)
11th March 2026
19AQI (US)
12th March 2026
28AQI (US)
13th March 2026
20AQI (US)
14th March 2026
30AQI (US)
15th March 2026
19AQI (US)
16th March 2026
22AQI (US)
17th March 2026
20AQI (US)
18th March 2026
22AQI (US)
19th March 2026
17AQI (US)
20th March 2026
22AQI (US)
21st March 2026
17AQI (US)
22nd March 2026
24AQI (US)
23rd March 2026
22AQI (US)
24th March 2026
22AQI (US)
25th March 2026
19AQI (US)
26th March 2026
36AQI (US)
27th March 2026
25AQI (US)
28th March 2026
21AQI (US)
29th March 2026
20AQI (US)
30th March 2026
23AQI (US)
31st March 2026
29AQI (US)
1st April 2026
28AQI (US)
2nd April 2026
19AQI (US)
3rd April 2026
26AQI (US)
4th April 2026
17AQI (US)
5th April 2026
20AQI (US)
6th April 2026
22AQI (US)
7th April 2026
29AQI (US)
8th April 2026
29AQI (US)
9th April 2026
25AQI (US)
10th April 2026
29AQI (US)
11th April 2026
20AQI (US)
12th April 2026
16AQI (US)
13th April 2026
17AQI (US)
14th April 2026
18AQI (US)
15th April 2026
23AQI (US)
16th April 2026
21AQI (US)
17th April 2026
18th April 2026
20AQI (US)
19th April 2026
17AQI (US)
20th April 2026
21AQI (US)
21st April 2026
20AQI (US)
22nd April 2026
23rd April 2026
34AQI (US)
24th April 2026
21AQI (US)
25th April 2026
18AQI (US)
26th April 2026
17AQI (US)
27th April 2026
15AQI (US)
28th April 2026
19AQI (US)
29th April 2026
15AQI (US)
30th April 2026
17AQI (US)
1st May 2026
15AQI (US)
2nd May 2026
13AQI (US)
3rd May 2026
13AQI (US)
4th May 2026
21AQI (US)
5th May 2026
26AQI (US)
6th May 2026
22AQI (US)
7th May 2026
14AQI (US)
8th May 2026
18AQI (US)
9th May 2026
10th May 2026
25AQI (US)
11th May 2026
16AQI (US)
12th May 2026
26AQI (US)
13th May 2026
33AQI (US)
14th May 2026
30AQI (US)
15th May 2026
27AQI (US)
16th May 2026
22AQI (US)
17th May 2026
18AQI (US)
18th May 2026
33AQI (US)
19th May 2026
28AQI (US)
20th May 2026
18AQI (US)
21st May 2026
20AQI (US)
22nd May 2026
20AQI (US)
23rd May 2026
23AQI (US)
24th May 2026
18AQI (US)
25th May 2026
18AQI (US)
26th May 2026
17AQI (US)
27th May 2026
14AQI (US)
28th May 2026
18AQI (US)
29th May 2026
16AQI (US)
30th May 2026
13AQI (US)
31st May 2026
15AQI (US)
1st June 2026
16AQI (US)
2nd June 2026
16AQI (US)
3rd June 2026
19AQI (US)
4th June 2026
18AQI (US)
5th June 2026
25AQI (US)
6th June 2026
21AQI (US)
7th June 2026
22AQI (US)
8th June 2026
25AQI (US)
9th June 2026
21AQI (US)
10th June 2026
33AQI (US)
11th June 2026
27AQI (US)
12th June 2026
24AQI (US)
13th June 2026
23AQI (US)
14th June 2026
21AQI (US)
15th June 2026
21AQI (US)
16th June 2026
22AQI (US)
17th June 2026
30AQI (US)
18th June 2026
29AQI (US)
19th June 2026
35AQI (US)
20th June 2026
37AQI (US)
21st June 2026
24AQI (US)
22nd June 2026
23AQI (US)
23rd June 2026
35AQI (US)
24th June 2026
22AQI (US)
25th June 2026
16AQI (US)
26th June 2026
13AQI (US)
27th June 2026
15AQI (US)
28th June 2026
44AQI (US)
29th June 2026
27AQI (US)
30th June 2026
31AQI (US)
1st July 2026
40AQI (US)
2nd July 2026
35AQI (US)
3rd July 2026
36AQI (US)
4th July 2026
24AQI (US)
5th July 2026
25AQI (US)
6th July 2026
37AQI (US)
7th July 2026
40AQI (US)
8th July 2026
23AQI (US)
9th July 2026
13AQI (US)
10th July 2026
15AQI (US)
11th July 2026
12AQI (US)
12th July 2026
13AQI (US)
13th July 2026
20AQI (US)
14th July 2026
23AQI (US)
15th July 2026
22AQI (US)
16th July 2026
24AQI (US)
17th July 2026
27AQI (US)
18th July 2026
34AQI (US)
19th July 2026
29AQI (US)
20th July 2026
34AQI (US)
21st July 2026
37AQI (US)
22nd July 2026
29AQI (US)
23rd July 2026
31AQI (US)
24th July 2026
31AQI (US)
25th July 2026
29AQI (US)
26th July 2026
27AQI (US)
27th July 2026
26AQI (US)
28th July 2026
34AQI (US)
29th July 2026
35AQI (US)
30th July 2026
30AQI (US)
31st July 2026
29AQI (US)
1st August 2026
31AQI (US)
2nd August 2026
29AQI (US)
3rd August 2026
59AQI (US)
4th August 2026
62AQI (US)
5th August 2026
54AQI (US)
6th August 2026
50AQI (US)
7th August 2026
53AQI (US)
8th August 2026
49AQI (US)
9th August 2026
33AQI (US)
10th August 2026
39AQI (US)
11th August 2026
31AQI (US)
12th August 2026
28AQI (US)
13th August 2026
14th August 2026
15th August 2026
16th August 2026
17th August 2026
18th August 2026
19th August 2026
20th August 2026
21st August 2026
22nd August 2026
23rd August 2026
24th August 2026
25th August 2026
26th August 2026
27th August 2026
28th August 2026
29th August 2026
30th August 2026
31st August 2026
1st September 2026
2nd September 2026
3rd September 2026
4th September 2026
5th September 2026
6th September 2026
7th September 2026
8th September 2026
9th September 2026
10th September 2026
11th September 2026
12th September 2026
13th September 2026
14th September 2026
15th September 2026
16th September 2026
17th September 2026
18th September 2026
19th September 2026
20th September 2026
21st September 2026
22nd September 2026
23rd September 2026
24th September 2026
25th September 2026
26th September 2026
27th September 2026
28th September 2026
29th September 2026
30th September 2026
1st October 2026
2nd October 2026
3rd October 2026
4th October 2026
5th October 2026
6th October 2026
7th October 2026
8th October 2026
9th October 2026
10th October 2026
11th October 2026
12th October 2026
13th October 2026
14th October 2026
15th October 2026
16th October 2026
17th October 2026
18th October 2026
19th October 2026
20th October 2026
21st October 2026
22nd October 2026
23rd October 2026
24th October 2026
25th October 2026
26th October 2026
27th October 2026
28th October 2026
29th October 2026
30th October 2026
31st October 2026
1st November 2026
2nd November 2026
3rd November 2026
4th November 2026
5th November 2026
6th November 2026
7th November 2026
8th November 2026
9th November 2026
10th November 2026
11th November 2026
12th November 2026
13th November 2026
14th November 2026
15th November 2026
16th November 2026
17th November 2026
18th November 2026
19th November 2026
20th November 2026
21st November 2026
22nd November 2026
23rd November 2026
24th November 2026
25th November 2026
26th November 2026
27th November 2026
28th November 2026
29th November 2026
30th November 2026
1st December 2026
2nd December 2026
3rd December 2026
4th December 2026
5th December 2026
6th December 2026
7th December 2026
8th December 2026
9th December 2026
10th December 2026
11th December 2026
12th December 2026
13th December 2026
14th December 2026
15th December 2026
16th December 2026
17th December 2026
18th December 2026
19th December 2026
20th December 2026
21st December 2026
22nd December 2026
23rd December 2026
24th December 2026
25th December 2026
26th December 2026
27th December 2026
28th December 2026
29th December 2026
30th December 2026
31st December 2026

23AQI (US)

23AQI (US)

23AQI (US)

21AQI (US)

20AQI (US)

25AQI (US)

28AQI (US)

43AQI (US)

No. of days

Jan.Feb.Mar.Apr.MayJun.Jul.Aug.Sep.Oct.Nov.Dec.Total Days

202624AQI (US)

31
28
31
28
30
30
31
8
4
217
4

Highest AQI (US) recorded in

August

43AQI (US)

Lowest AQI (US) recorded in

May

20AQI (US)

202529AQI (US)

31
28
31
29
1
31
30
28
3
25
6
25
5
31
30
31
350
15

Highest AQI (US) recorded in

August

42AQI (US)

Lowest AQI (US) recorded in

March

20AQI (US)

202424AQI (US)

30
1
29
31
30
31
30
26
5
29
2
29
1
28
3
30
31
354
12

Highest AQI (US) recorded in

July

34AQI (US)

Lowest AQI (US) recorded in

May

17AQI (US)

202326AQI (US)

26
2
24
2
31
29
1
26
3
1
30
31
17
5
30
30
1
28
31
333
14
1

Highest AQI (US) recorded in

May

35AQI (US)

Lowest AQI (US) recorded in

December

14AQI (US)

202227AQI (US)

29
1
21
1
30
1
14
2
1
31
27
3
21
2
26
3
31
30
30
292
11
1

Highest AQI (US) recorded in

April

35AQI (US)

Lowest AQI (US) recorded in

November

23AQI (US)

202133AQI (US)

28
2
22
6
27
4
24
3
28
20
6
20
10
14
16
1
24
6
31
29
1
30
1
297
55
1

Highest AQI (US) recorded in

August

55AQI (US)

Lowest AQI (US) recorded in

May

22AQI (US)

202036AQI (US)

3
3
5
1
13
5
25
2
29
1
20
8
19
10
20
10
1
29
30
1
193
41
1

Highest AQI (US) recorded in

March

56AQI (US)

Lowest AQI (US) recorded in

November

24AQI (US)

Most & Least Polluted Years Over the Last 7 Years

Most Polluted Year Recorded
2020(Avg.)
36AQI (US)
Least Polluted Year Recorded
2024(Avg.)
24AQI (US)

Boulder's annual 2026 AQI (US) (24) shows an average percentage change of -16.1% (improved AQI (US)) compared to previous years: 2020 (36), 2021 (33), 2022 (27), 2023 (26), 2024 (24), 2025 (29).