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Reservoir Road, 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+

October Air Quality Analysis

Reservoir Road, Boulder, Colorado, United States

2025
AQI
.
Days

AQI Trends: Highest and Lowest

Highest AQI recorded on
8th Oct 2025
54AQI
Lowest AQI recorded on
13th Oct 2025
21AQI


Same Day Analysis (17th October ):
On this day, AQI across the 1 years varied significantly: 2025 ranks 1st highest AQI at 28 of Good air quality on the same day.

Download 2024 Annual Data

World Air Quality Report

Globe

Day & Night AQI Trend: 17th Oct - 18th Oct 2025

Reservoir Road, Boulder, Colorado, United States

AQI
Day
Night
.

7 AM17th Oct 2025

6 PM

6 AM18th Oct 2025

Day time
Avg. Highest Time
8AM17th Oct

33AQI

Avg. Lowest Time
6PM17th Oct

13AQI

Night time
Avg. Highest Time
12AM18th Oct

50AQI

Avg. Lowest Time
7PM17th Oct

14AQI

In the last 24 hours,

Reservoir Road's AQI reached its highest point of 50 at 12 AM during the Night, while the lowest point, 13, was recorded at 6 PM during the Day between 17th Oct and 18th Oct 2025.

Day & Night AQI Trend : Sep - Oct 2025

Reservoir Road, Boulder, Colorado, United States

SepOct
18th - 19th19th - 20th20th - 21st21st - 22nd22nd - 23rd23rd - 24th24th - 25th25th - 26th26th - 27th27th - 28th28th - 29th29th - 30th30th - 01st01st - 02nd02nd - 03rd03rd - 04th04th - 05th05th - 06th06th - 07th07th - 08th08th - 09th09th - 10th10th - 11th11th - 12th12th - 13th13th - 14th14th - 15th15th - 16th16th - 17th17th - 18th18th
Day
Night
18th Sep 2025177 AMAQI
18th Sep 2025198 AMAQI
18th Sep 2025229 AMAQI
18th Sep 20252410 AMAQI
18th Sep 20252711 AMAQI
18th Sep 20252612 PMAQI
18th Sep 2025231 PMAQI
18th Sep 2025222 PMAQI
18th Sep 2025213 PMAQI
18th Sep 2025194 PMAQI
18th Sep 2025195 PMAQI
18th Sep 2025196 PMAQI
18th Sep 2025197 PMAQI
18th Sep 2025198 PMAQI
18th Sep 2025209 PMAQI
18th Sep 20252210 PMAQI
18th Sep 20252311 PMAQI
19th Sep 20252412 AMAQI
19th Sep 2025241 AMAQI
19th Sep 2025242 AMAQI
19th Sep 2025253 AMAQI
19th Sep 2025244 AMAQI
19th Sep 2025305 AMAQI
19th Sep 2025326 AMAQI

15°C8/23°C

19th Sep 2025337 AMAQI
19th Sep 2025348 AMAQI
19th Sep 2025329 AMAQI
19th Sep 20253410 AMAQI
19th Sep 20253411 AMAQI
19th Sep 20253312 PMAQI
19th Sep 2025271 PMAQI
19th Sep 2025242 PMAQI
19th Sep 2025253 PMAQI
19th Sep 2025224 PMAQI
19th Sep 2025225 PMAQI
19th Sep 2025226 PMAQI
19th Sep 2025267 PMAQI
19th Sep 2025278 PMAQI
19th Sep 2025239 PMAQI
19th Sep 20252610 PMAQI
19th Sep 20252611 PMAQI
20th Sep 20252612 AMAQI
20th Sep 2025271 AMAQI
20th Sep 2025262 AMAQI
20th Sep 2025283 AMAQI
20th Sep 2025284 AMAQI
20th Sep 2025305 AMAQI
20th Sep 2025316 AMAQI

17°C8/26°C

20th Sep 2025287 AMAQI
20th Sep 2025288 AMAQI
20th Sep 2025299 AMAQI
20th Sep 20252910 AMAQI
20th Sep 20252911 AMAQI
20th Sep 20252912 PMAQI
20th Sep 2025301 PMAQI
20th Sep 2025282 PMAQI
20th Sep 2025303 PMAQI
20th Sep 2025274 PMAQI
20th Sep 2025255 PMAQI
20th Sep 2025236 PMAQI
20th Sep 2025287 PMAQI
20th Sep 2025308 PMAQI
20th Sep 2025329 PMAQI
20th Sep 20253110 PMAQI
20th Sep 20252811 PMAQI
21st Sep 20252812 AMAQI
21st Sep 2025271 AMAQI
21st Sep 2025282 AMAQI
21st Sep 2025283 AMAQI
21st Sep 2025284 AMAQI
21st Sep 2025285 AMAQI
21st Sep 2025266 AMAQI

16°C11/25°C

21st Sep 2025277 AMAQI
21st Sep 2025268 AMAQI
21st Sep 2025269 AMAQI
21st Sep 20252410 AMAQI
21st Sep 20252311 AMAQI
21st Sep 20252112 PMAQI
21st Sep 2025181 PMAQI
21st Sep 2025192 PMAQI
21st Sep 2025193 PMAQI
21st Sep 2025204 PMAQI
21st Sep 2025185 PMAQI
21st Sep 2025196 PMAQI
21st Sep 2025227 PMAQI
21st Sep 2025238 PMAQI
21st Sep 2025209 PMAQI
21st Sep 20252010 PMAQI
21st Sep 20252211 PMAQI
22nd Sep 20252212 AMAQI
22nd Sep 2025211 AMAQI
22nd Sep 2025222 AMAQI
22nd Sep 2025213 AMAQI
22nd Sep 2025224 AMAQI
22nd Sep 2025185 AMAQI
22nd Sep 2025176 AMAQI

19°C11/27°C

22nd Sep 2025187 AMAQI
22nd Sep 2025198 AMAQI
22nd Sep 2025219 AMAQI
22nd Sep 20252210 AMAQI
22nd Sep 20252411 AMAQI
22nd Sep 20252512 PMAQI
22nd Sep 2025291 PMAQI
22nd Sep 2025222 PMAQI
22nd Sep 2025203 PMAQI
22nd Sep 2025194 PMAQI
22nd Sep 2025205 PMAQI
22nd Sep 2025186 PMAQI
22nd Sep 2025197 PMAQI
22nd Sep 2025218 PMAQI
22nd Sep 2025199 PMAQI
22nd Sep 20252110 PMAQI
22nd Sep 20252211 PMAQI
23rd Sep 20252212 AMAQI
23rd Sep 2025221 AMAQI
23rd Sep 2025222 AMAQI
23rd Sep 2025223 AMAQI
23rd Sep 2025224 AMAQI
23rd Sep 2025235 AMAQI
23rd Sep 2025246 AMAQI

18°C13/23°C

23rd Sep 2025267 AMAQI
23rd Sep 2025278 AMAQI
23rd Sep 2025279 AMAQI
23rd Sep 20252610 AMAQI
23rd Sep 20252311 AMAQI
23rd Sep 20252212 PMAQI
23rd Sep 2025231 PMAQI
23rd Sep 2025222 PMAQI
23rd Sep 2025233 PMAQI
23rd Sep 2025224 PMAQI
23rd Sep 2025215 PMAQI
23rd Sep 2025216 PMAQI
23rd Sep 2025227 PMAQI
23rd Sep 2025228 PMAQI
23rd Sep 2025209 PMAQI
23rd Sep 20252110 PMAQI
23rd Sep 20252211 PMAQI
24th Sep 20252212 AMAQI
24th Sep 2025251 AMAQI
24th Sep 2025272 AMAQI
24th Sep 2025263 AMAQI
24th Sep 2025264 AMAQI
24th Sep 2025265 AMAQI
24th Sep 2025286 AMAQI

9°C6/13°C

24th Sep 2025287 AMAQI
24th Sep 2025328 AMAQI
24th Sep 2025339 AMAQI
24th Sep 20253710 AMAQI
24th Sep 20254011 AMAQI
24th Sep 20253812 PMAQI
24th Sep 2025371 PMAQI
24th Sep 2025362 PMAQI
24th Sep 2025303 PMAQI
24th Sep 2025294 PMAQI
24th Sep 2025285 PMAQI
24th Sep 2025286 PMAQI
24th Sep 2025277 PMAQI
24th Sep 2025278 PMAQI
24th Sep 2025299 PMAQI
24th Sep 20253210 PMAQI
24th Sep 20253311 PMAQI
25th Sep 20253012 AMAQI
25th Sep 2025281 AMAQI
25th Sep 2025282 AMAQI
25th Sep 2025273 AMAQI
25th Sep 2025284 AMAQI
25th Sep 2025225 AMAQI
25th Sep 2025206 AMAQI

13°C5/22°C

25th Sep 2025177 AMAQI
25th Sep 2025188 AMAQI
25th Sep 2025189 AMAQI
25th Sep 20251810 AMAQI
25th Sep 20252311 AMAQI
25th Sep 20252512 PMAQI
25th Sep 2025221 PMAQI
25th Sep 2025182 PMAQI
25th Sep 2025173 PMAQI
25th Sep 2025154 PMAQI
25th Sep 2025155 PMAQI
25th Sep 2025166 PMAQI
25th Sep 2025177 PMAQI
25th Sep 2025178 PMAQI
25th Sep 2025309 PMAQI
25th Sep 20252210 PMAQI
25th Sep 20251911 PMAQI
26th Sep 20251712 AMAQI
26th Sep 2025171 AMAQI
26th Sep 2025172 AMAQI
26th Sep 2025173 AMAQI
26th Sep 2025174 AMAQI
26th Sep 2025175 AMAQI
26th Sep 2025176 AMAQI

17°C8/26°C

26th Sep 2025177 AMAQI
26th Sep 2025178 AMAQI
26th Sep 2025269 AMAQI
26th Sep 20254010 AMAQI
26th Sep 20253911 AMAQI
26th Sep 20252912 PMAQI
26th Sep 2025271 PMAQI
26th Sep 2025242 PMAQI
26th Sep 2025183 PMAQI
26th Sep 2025154 PMAQI
26th Sep 2025165 PMAQI
26th Sep 2025166 PMAQI
26th Sep 2025197 PMAQI
26th Sep 2025238 PMAQI
26th Sep 2025279 PMAQI
26th Sep 20252110 PMAQI
26th Sep 20251911 PMAQI
27th Sep 20251812 AMAQI
27th Sep 2025181 AMAQI
27th Sep 2025182 AMAQI
27th Sep 2025173 AMAQI
27th Sep 2025174 AMAQI
27th Sep 2025175 AMAQI
27th Sep 2025166 AMAQI

19°C12/28°C

27th Sep 2025167 AMAQI
27th Sep 2025178 AMAQI
27th Sep 2025209 AMAQI
27th Sep 20252710 AMAQI
27th Sep 20252711 AMAQI
27th Sep 20252412 PMAQI
27th Sep 2025261 PMAQI
27th Sep 2025282 PMAQI
27th Sep 2025273 PMAQI
27th Sep 2025264 PMAQI
27th Sep 2025255 PMAQI
27th Sep 2025256 PMAQI
27th Sep 2025267 PMAQI
27th Sep 2025268 PMAQI
27th Sep 2025259 PMAQI
27th Sep 20252410 PMAQI
27th Sep 20252611 PMAQI
28th Sep 20252612 AMAQI
28th Sep 2025331 AMAQI
28th Sep 2025312 AMAQI
28th Sep 2025283 AMAQI
28th Sep 2025284 AMAQI
28th Sep 2025225 AMAQI
28th Sep 2025216 AMAQI

19°C14/25°C

28th Sep 2025207 AMAQI
28th Sep 2025218 AMAQI
28th Sep 2025219 AMAQI
28th Sep 20252210 AMAQI
28th Sep 20252311 AMAQI
28th Sep 20252712 PMAQI
28th Sep 2025271 PMAQI
28th Sep 2025282 PMAQI
28th Sep 2025243 PMAQI
28th Sep 2025234 PMAQI
28th Sep 2025205 PMAQI
28th Sep 2025216 PMAQI
28th Sep 2025227 PMAQI
28th Sep 2025188 PMAQI
28th Sep 2025179 PMAQI
28th Sep 20252010 PMAQI
28th Sep 20252311 PMAQI
29th Sep 20251812 AMAQI
29th Sep 2025111 AMAQI
29th Sep 2025102 AMAQI
29th Sep 2025113 AMAQI
29th Sep 2025104 AMAQI
29th Sep 2025125 AMAQI
29th Sep 2025136 AMAQI

17°C12/23°C

29th Sep 2025137 AMAQI
29th Sep 2025108 AMAQI
29th Sep 2025119 AMAQI
29th Sep 20251510 AMAQI
29th Sep 20251911 AMAQI
29th Sep 20251612 PMAQI
29th Sep 2025131 PMAQI
29th Sep 2025142 PMAQI
29th Sep 2025153 PMAQI
29th Sep 2025174 PMAQI
29th Sep 2025165 PMAQI
29th Sep 2025156 PMAQI
29th Sep 2025127 PMAQI
29th Sep 2025128 PMAQI
29th Sep 2025129 PMAQI
29th Sep 20251110 PMAQI
29th Sep 20251011 PMAQI
30th Sep 20251012 AMAQI
30th Sep 2025101 AMAQI
30th Sep 202582 AMAQI
30th Sep 202573 AMAQI
30th Sep 202574 AMAQI
30th Sep 2025135 AMAQI
30th Sep 2025126 AMAQI

15°C11/22°C

30th Sep 2025147 AMAQI
30th Sep 2025168 AMAQI
30th Sep 2025179 AMAQI
30th Sep 20251710 AMAQI
30th Sep 20252511 AMAQI
30th Sep 20252512 PMAQI
30th Sep 2025201 PMAQI
30th Sep 2025182 PMAQI
30th Sep 2025213 PMAQI
30th Sep 2025134 PMAQI
30th Sep 2025125 PMAQI
30th Sep 2025156 PMAQI
30th Sep 2025177 PMAQI
30th Sep 2025198 PMAQI
30th Sep 2025199 PMAQI
30th Sep 20252610 PMAQI
30th Sep 20252511 PMAQI
1st Oct 20251712 AMAQI
1st Oct 2025171 AMAQI
1st Oct 2025172 AMAQI
1st Oct 2025173 AMAQI
1st Oct 2025184 AMAQI
1st Oct 2025215 AMAQI
1st Oct 2025166 AMAQI

15°C8/23°C

1st Oct 2025157 AMAQI
1st Oct 2025178 AMAQI
1st Oct 2025189 AMAQI
1st Oct 20252410 AMAQI
1st Oct 20254011 AMAQI
1st Oct 20253612 PMAQI
1st Oct 2025421 PMAQI
1st Oct 2025342 PMAQI
1st Oct 2025263 PMAQI
1st Oct 2025154 PMAQI
1st Oct 2025185 PMAQI
1st Oct 2025296 PMAQI
1st Oct 2025257 PMAQI
1st Oct 2025288 PMAQI
1st Oct 2025319 PMAQI
1st Oct 20254410 PMAQI
1st Oct 20254011 PMAQI
2nd Oct 20253812 AMAQI
2nd Oct 2025361 AMAQI
2nd Oct 2025392 AMAQI
2nd Oct 2025273 AMAQI
2nd Oct 2025344 AMAQI
2nd Oct 2025395 AMAQI
2nd Oct 2025346 AMAQI

19°C15/26°C

2nd Oct 2025427 AMAQI
2nd Oct 2025528 AMAQI
2nd Oct 2025539 AMAQI
2nd Oct 20254710 AMAQI
2nd Oct 20254711 AMAQI
2nd Oct 20253612 PMAQI
2nd Oct 2025361 PMAQI
2nd Oct 2025402 PMAQI
2nd Oct 2025363 PMAQI
2nd Oct 2025274 PMAQI
2nd Oct 2025255 PMAQI
2nd Oct 2025256 PMAQI
2nd Oct 2025307 PMAQI
2nd Oct 2025348 PMAQI
2nd Oct 2025369 PMAQI
2nd Oct 20254510 PMAQI
2nd Oct 20254811 PMAQI
3rd Oct 20253412 AMAQI
3rd Oct 2025391 AMAQI
3rd Oct 2025402 AMAQI
3rd Oct 2025373 AMAQI
3rd Oct 2025364 AMAQI
3rd Oct 2025305 AMAQI
3rd Oct 2025386 AMAQI

19°C12/26°C

3rd Oct 2025417 AMAQI
3rd Oct 2025458 AMAQI
3rd Oct 2025419 AMAQI
3rd Oct 20254010 AMAQI
3rd Oct 20254811 AMAQI
3rd Oct 20254312 PMAQI
3rd Oct 2025411 PMAQI
3rd Oct 2025362 PMAQI
3rd Oct 2025413 PMAQI
3rd Oct 2025204 PMAQI
3rd Oct 2025205 PMAQI
3rd Oct 2025256 PMAQI
3rd Oct 2025307 PMAQI
3rd Oct 2025328 PMAQI
3rd Oct 2025419 PMAQI
3rd Oct 20255410 PMAQI
3rd Oct 20255511 PMAQI
4th Oct 20254512 AMAQI
4th Oct 2025501 AMAQI
4th Oct 2025292 AMAQI
4th Oct 2025413 AMAQI
4th Oct 2025384 AMAQI
4th Oct 2025425 AMAQI
4th Oct 2025346 AMAQI

21°C12/29°C

4th Oct 2025277 AMAQI
4th Oct 2025198 AMAQI
4th Oct 2025289 AMAQI
4th Oct 20252610 AMAQI
4th Oct 20253511 AMAQI
4th Oct 20254012 PMAQI
4th Oct 2025341 PMAQI
4th Oct 2025362 PMAQI
4th Oct 2025293 PMAQI
4th Oct 2025324 PMAQI
4th Oct 2025415 PMAQI
4th Oct 2025296 PMAQI
4th Oct 2025387 PMAQI
4th Oct 2025288 PMAQI
4th Oct 2025269 PMAQI
4th Oct 20252510 PMAQI
4th Oct 20252911 PMAQI
5th Oct 20253312 AMAQI
5th Oct 2025151 AMAQI
5th Oct 2025292 AMAQI
5th Oct 2025173 AMAQI
5th Oct 2025274 AMAQI
5th Oct 2025245 AMAQI
5th Oct 2025216 AMAQI

19°C12/26°C

5th Oct 2025187 AMAQI
5th Oct 2025348 AMAQI
5th Oct 2025339 AMAQI
5th Oct 20252010 AMAQI
5th Oct 20253311 AMAQI
5th Oct 20253812 PMAQI
5th Oct 2025371 PMAQI
5th Oct 2025422 PMAQI
5th Oct 2025283 PMAQI
5th Oct 2025154 PMAQI
5th Oct 2025145 PMAQI
5th Oct 2025126 PMAQI
5th Oct 2025147 PMAQI
5th Oct 2025228 PMAQI
5th Oct 2025169 PMAQI
5th Oct 20251010 PMAQI
5th Oct 20252511 PMAQI
6th Oct 20253212 AMAQI
6th Oct 2025271 AMAQI
6th Oct 2025282 AMAQI
6th Oct 2025223 AMAQI
6th Oct 2025194 AMAQI
6th Oct 2025175 AMAQI
6th Oct 2025176 AMAQI

11°C8/17°C

6th Oct 2025137 AMAQI
6th Oct 2025148 AMAQI
6th Oct 2025159 AMAQI
6th Oct 20252910 AMAQI
6th Oct 2025811 AMAQI
7th Oct 2025375 AMAQI
7th Oct 2025446 AMAQI

7°C4/9°C

7th Oct 2025347 AMAQI
7th Oct 2025468 AMAQI
7th Oct 2025379 AMAQI
7th Oct 20253910 AMAQI
7th Oct 20254011 AMAQI
7th Oct 20254412 PMAQI
7th Oct 2025401 PMAQI
7th Oct 2025452 PMAQI
7th Oct 2025433 PMAQI
7th Oct 2025524 PMAQI
7th Oct 2025535 PMAQI
7th Oct 2025556 PMAQI
7th Oct 2025547 PMAQI
7th Oct 2025568 PMAQI
7th Oct 2025569 PMAQI
7th Oct 20255610 PMAQI
7th Oct 20255811 PMAQI
8th Oct 20255412 AMAQI
8th Oct 2025551 AMAQI
8th Oct 2025542 AMAQI
8th Oct 2025573 AMAQI
8th Oct 2025544 AMAQI
8th Oct 2025515 AMAQI
8th Oct 2025576 AMAQI

10°C5/15°C

8th Oct 2025567 AMAQI
8th Oct 2025568 AMAQI
8th Oct 2025549 AMAQI
8th Oct 20255910 AMAQI
8th Oct 20255911 AMAQI
8th Oct 20255512 PMAQI
8th Oct 2025551 PMAQI
8th Oct 2025552 PMAQI
8th Oct 2025543 PMAQI
8th Oct 2025534 PMAQI
8th Oct 2025445 PMAQI
8th Oct 2025466 PMAQI
8th Oct 2025507 PMAQI
8th Oct 2025548 PMAQI
8th Oct 2025499 PMAQI
8th Oct 20255410 PMAQI
8th Oct 20255711 PMAQI
9th Oct 20255712 AMAQI
9th Oct 2025581 AMAQI
9th Oct 2025562 AMAQI
9th Oct 2025433 AMAQI
9th Oct 2025404 AMAQI
9th Oct 2025435 AMAQI
9th Oct 2025406 AMAQI

17°C10/26°C

9th Oct 2025517 AMAQI
9th Oct 2025608 AMAQI
9th Oct 2025689 AMAQI
9th Oct 20256610 AMAQI
9th Oct 20256511 AMAQI
9th Oct 20256212 PMAQI
9th Oct 2025501 PMAQI
9th Oct 2025522 PMAQI
9th Oct 2025423 PMAQI
9th Oct 2025404 PMAQI
9th Oct 2025215 PMAQI
9th Oct 2025266 PMAQI
9th Oct 2025227 PMAQI
9th Oct 2025328 PMAQI
9th Oct 2025459 PMAQI
9th Oct 20255910 PMAQI
9th Oct 20255611 PMAQI
10th Oct 20254512 AMAQI
10th Oct 2025161 AMAQI
10th Oct 2025322 AMAQI
10th Oct 2025173 AMAQI
10th Oct 2025244 AMAQI
10th Oct 2025395 AMAQI
10th Oct 2025346 AMAQI

16°C9/26°C

10th Oct 2025227 AMAQI
10th Oct 2025548 AMAQI
10th Oct 2025359 AMAQI
10th Oct 20255210 AMAQI
10th Oct 20253911 AMAQI
10th Oct 20253512 PMAQI
10th Oct 2025331 PMAQI
10th Oct 2025342 PMAQI
10th Oct 2025443 PMAQI
10th Oct 2025484 PMAQI
10th Oct 2025435 PMAQI
10th Oct 2025386 PMAQI
10th Oct 2025417 PMAQI
10th Oct 2025378 PMAQI
10th Oct 2025399 PMAQI
10th Oct 20254310 PMAQI
10th Oct 20254811 PMAQI
11th Oct 20255312 AMAQI
11th Oct 2025561 AMAQI
11th Oct 2025572 AMAQI
11th Oct 2025603 AMAQI
11th Oct 2025614 AMAQI
11th Oct 2025565 AMAQI
11th Oct 2025586 AMAQI

14°C11/18°C

11th Oct 2025447 AMAQI
11th Oct 2025448 AMAQI
11th Oct 2025449 AMAQI
11th Oct 20254210 AMAQI
11th Oct 20255311 AMAQI
11th Oct 20254212 PMAQI
11th Oct 2025451 PMAQI
11th Oct 2025502 PMAQI
11th Oct 2025483 PMAQI
11th Oct 2025514 PMAQI
11th Oct 2025515 PMAQI
11th Oct 2025506 PMAQI
11th Oct 2025517 PMAQI
11th Oct 2025508 PMAQI
11th Oct 2025479 PMAQI
11th Oct 20255210 PMAQI
11th Oct 20256011 PMAQI
12th Oct 20255912 AMAQI
12th Oct 2025591 AMAQI
12th Oct 2025602 AMAQI
12th Oct 2025613 AMAQI
12th Oct 2025564 AMAQI
12th Oct 2025565 AMAQI
12th Oct 2025576 AMAQI

15°C11/19°C

12th Oct 2025517 AMAQI
12th Oct 2025528 AMAQI
12th Oct 2025559 AMAQI
12th Oct 20255610 AMAQI
12th Oct 20253711 AMAQI
12th Oct 20252012 PMAQI
12th Oct 2025171 PMAQI
12th Oct 2025162 PMAQI
12th Oct 2025373 PMAQI
12th Oct 2025214 PMAQI
12th Oct 2025135 PMAQI
12th Oct 2025126 PMAQI
12th Oct 2025177 PMAQI
12th Oct 2025128 PMAQI
12th Oct 2025339 PMAQI
12th Oct 20252310 PMAQI
12th Oct 20251911 PMAQI
13th Oct 20251712 AMAQI
13th Oct 2025281 AMAQI
13th Oct 2025102 AMAQI
13th Oct 202593 AMAQI
13th Oct 2025144 AMAQI
13th Oct 2025245 AMAQI
13th Oct 2025286 AMAQI

15°C10/21°C

13th Oct 2025177 AMAQI
13th Oct 2025158 AMAQI
13th Oct 2025179 AMAQI
13th Oct 20251810 AMAQI
13th Oct 20252411 AMAQI
13th Oct 20252212 PMAQI
13th Oct 2025181 PMAQI
13th Oct 2025182 PMAQI
13th Oct 2025203 PMAQI
13th Oct 2025244 PMAQI
13th Oct 2025225 PMAQI
13th Oct 2025176 PMAQI
13th Oct 2025177 PMAQI
13th Oct 2025258 PMAQI
13th Oct 2025299 PMAQI
13th Oct 20253510 PMAQI
13th Oct 20253211 PMAQI
14th Oct 20253512 AMAQI
14th Oct 2025401 AMAQI
14th Oct 2025402 AMAQI
14th Oct 2025363 AMAQI
14th Oct 2025234 AMAQI
14th Oct 2025195 AMAQI
14th Oct 2025216 AMAQI

9°C4/14°C

14th Oct 2025287 AMAQI
14th Oct 2025258 AMAQI
14th Oct 2025289 AMAQI
14th Oct 20253710 AMAQI
14th Oct 20253611 AMAQI
14th Oct 20253412 PMAQI
14th Oct 2025351 PMAQI
14th Oct 2025322 PMAQI
14th Oct 2025393 PMAQI
14th Oct 2025364 PMAQI
14th Oct 2025375 PMAQI
14th Oct 2025436 PMAQI
14th Oct 2025407 PMAQI
14th Oct 2025438 PMAQI
14th Oct 2025509 PMAQI
14th Oct 20255010 PMAQI
14th Oct 20255311 PMAQI
15th Oct 20252712 AMAQI
15th Oct 2025451 AMAQI
15th Oct 2025512 AMAQI
15th Oct 2025363 AMAQI
15th Oct 2025404 AMAQI
15th Oct 2025445 AMAQI
15th Oct 2025436 AMAQI

11°C3/19°C

15th Oct 2025407 AMAQI
15th Oct 2025488 AMAQI
15th Oct 2025489 AMAQI
15th Oct 20254710 AMAQI
15th Oct 20253711 AMAQI
15th Oct 20254612 PMAQI
15th Oct 2025521 PMAQI
15th Oct 2025432 PMAQI
15th Oct 2025423 PMAQI
15th Oct 2025404 PMAQI
15th Oct 2025555 PMAQI
15th Oct 2025556 PMAQI
15th Oct 2025567 PMAQI
15th Oct 2025548 PMAQI
15th Oct 2025549 PMAQI
15th Oct 20255110 PMAQI
15th Oct 20255111 PMAQI
16th Oct 20254512 AMAQI
16th Oct 2025441 AMAQI
16th Oct 2025372 AMAQI
16th Oct 2025303 AMAQI
16th Oct 2025134 AMAQI
16th Oct 202585 AMAQI
16th Oct 2025306 AMAQI

14°C8/22°C

16th Oct 2025357 AMAQI
16th Oct 2025368 AMAQI
16th Oct 2025389 AMAQI
16th Oct 20253910 AMAQI
16th Oct 20252811 AMAQI
16th Oct 20253012 PMAQI
16th Oct 2025321 PMAQI
16th Oct 2025352 PMAQI
16th Oct 2025293 PMAQI
16th Oct 2025394 PMAQI
16th Oct 2025375 PMAQI
16th Oct 2025376 PMAQI
16th Oct 2025337 PMAQI
16th Oct 2025368 PMAQI
16th Oct 2025369 PMAQI
16th Oct 20254010 PMAQI
16th Oct 20254311 PMAQI
17th Oct 20254412 AMAQI
17th Oct 2025391 AMAQI
17th Oct 2025222 AMAQI
17th Oct 2025233 AMAQI
17th Oct 2025224 AMAQI
17th Oct 2025375 AMAQI
17th Oct 2025226 AMAQI

13°C7/21°C

17th Oct 2025327 AMAQI
17th Oct 2025338 AMAQI
17th Oct 2025259 AMAQI
17th Oct 20253310 AMAQI
17th Oct 20252811 AMAQI
17th Oct 20251812 PMAQI
17th Oct 2025261 PMAQI
17th Oct 2025212 PMAQI
17th Oct 2025303 PMAQI
17th Oct 2025164 PMAQI
17th Oct 2025145 PMAQI
17th Oct 2025136 PMAQI
17th Oct 2025147 PMAQI
17th Oct 2025168 PMAQI
17th Oct 2025479 PMAQI
17th Oct 20254010 PMAQI
17th Oct 20254411 PMAQI
18th Oct 20255012 AMAQI
18th Oct 2025451 AMAQI
18th Oct 2025362 AMAQI
18th Oct 2025483 AMAQI
18th Oct 2025334 AMAQI
18th Oct 2025305 AMAQI
18th Oct 2025286 AMAQI

12°C6/19°C

18th Oct 2025347 AMAQI
7 AM
18th Oct 2025268 AMAQI
18th Oct 2025329 AMAQI
18th Oct 20254410 AMAQI
18th Oct 20255511 AMAQI
12 PM
6 PM
12 AM
6 AM

--°C/°C

Day time
Avg. Highest Time
10 AM - 11 AM

34AQI

2 hours / Day
60 hours / Month
Avg. Lowest Time
5 PM

26AQI

1 hours / Day
30 hours / Month
In the last 30 days, during the daytime, the highest AQI was between 10 AM to 11 AM (Avg. 34), while the lowest AQI was between 5 PM to 5 PM (Avg. 26).
Night time
Avg. Highest Time
10 PM - 11 PM

35AQI

2 hours / Day
60 hours / Month
Avg. Lowest Time
4 AM

28AQI

1 hours / Day
30 hours / Month
In the last 30 days, during the daytime, the highest AQI was between 10 PM to 11 PM (Avg. 35), while the lowest AQI was between 4 AM to 4 AM (Avg. 28).

2025 Days Vs Air Quality

Reservoir Road, Boulder, Colorado, United States

2025

91%

188

9%

18

Total number of days with different AQI categories in last 291 days in 2025 (74 days remaining)

Good
188 Days
Moderate
18 Days
Poor
0 Days
Unhealthy
0 Days
Severe
0 Days
Hazardous
0 Days



Under WHO’s Safe Air Quality Limits: 91%

Health Risk Level:

Very Low

In 2025, 91% of 291 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

Reservoir Road, Boulder, 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.

-1th undefined 2025
-1th undefined 2025
-1th undefined 2025
1st January 2025
2nd January 2025
3rd January 2025
4th January 2025
5th January 2025
6th January 2025
7th January 2025
8th January 2025
9th January 2025
10th January 2025
11th January 2025
12th January 2025
13th January 2025
14th January 2025
15th January 2025
16th January 2025
17th January 2025
18th January 2025
19th January 2025
20th January 2025
21st January 2025
22nd January 2025
23rd January 2025
24th January 2025
25th January 2025
26th January 2025
27th January 2025
28th January 2025
29th January 2025
30th January 2025
31st January 2025
1st February 2025
2nd February 2025
3rd February 2025
4th February 2025
5th February 2025
6th February 2025
7th February 2025
8th February 2025
9th February 2025
10th February 2025
11th February 2025
12th February 2025
13th February 2025
14th February 2025
15th February 2025
16th February 2025
17th February 2025
18th February 2025
19th February 2025
20th February 2025
21st February 2025
22nd February 2025
23rd February 2025
24th February 2025
25th February 2025
26th February 2025
27th February 2025
28th February 2025
1st March 2025
2nd March 2025
3rd March 2025
4th March 2025
5th March 2025
6th March 2025
7th March 2025
8th March 2025
9th March 2025
10th March 2025
11th March 2025
12th March 2025
13th March 2025
14th March 2025
15th March 2025
16th March 2025
17th March 2025
18th March 2025
19th March 2025
20th March 2025
21st March 2025
22nd March 2025
23rd March 2025
24th March 2025
25th March 2025
26th March 2025
27AQI
27th March 2025
25AQI
28th March 2025
29AQI
29th March 2025
20AQI
30th March 2025
27AQI
31st March 2025
42AQI
1st April 2025
29AQI
2nd April 2025
18AQI
3rd April 2025
20AQI
4th April 2025
29AQI
5th April 2025
32AQI
6th April 2025
26AQI
7th April 2025
31AQI
8th April 2025
31AQI
9th April 2025
42AQI
10th April 2025
45AQI
11th April 2025
42AQI
12th April 2025
31AQI
13th April 2025
25AQI
14th April 2025
18AQI
15th April 2025
37AQI
16th April 2025
28AQI
17th April 2025
26AQI
18th April 2025
14AQI
19th April 2025
24AQI
20th April 2025
21AQI
21st April 2025
17AQI
22nd April 2025
21AQI
23rd April 2025
35AQI
24th April 2025
57AQI
25th April 2025
28AQI
26th April 2025
28AQI
27th April 2025
30AQI
28th April 2025
17AQI
29th April 2025
17AQI
30th April 2025
19AQI
1st May 2025
17AQI
2nd May 2025
20AQI
3rd May 2025
21AQI
4th May 2025
22AQI
5th May 2025
17AQI
6th May 2025
19AQI
7th May 2025
24AQI
8th May 2025
29AQI
9th May 2025
27AQI
10th May 2025
25AQI
11th May 2025
20AQI
12th May 2025
23AQI
13th May 2025
28AQI
14th May 2025
34AQI
15th May 2025
15AQI
16th May 2025
16AQI
17th May 2025
19AQI
18th May 2025
34AQI
19th May 2025
14AQI
20th May 2025
17AQI
21st May 2025
20AQI
22nd May 2025
24AQI
23rd May 2025
32AQI
24th May 2025
46AQI
25th May 2025
17AQI
26th May 2025
18AQI
27th May 2025
34AQI
28th May 2025
25AQI
29th May 2025
18AQI
30th May 2025
24AQI
31st May 2025
26AQI
1st June 2025
30AQI
2nd June 2025
25AQI
3rd June 2025
21AQI
4th June 2025
37AQI
5th June 2025
38AQI
6th June 2025
33AQI
7th June 2025
22AQI
8th June 2025
31AQI
9th June 2025
49AQI
10th June 2025
37AQI
11th June 2025
28AQI
12th June 2025
26AQI
13th June 2025
26AQI
14th June 2025
32AQI
15th June 2025
26AQI
16th June 2025
27AQI
17th June 2025
31AQI
18th June 2025
27AQI
19th June 2025
30AQI
20th June 2025
32AQI
21st June 2025
33AQI
22nd June 2025
34AQI
23rd June 2025
40AQI
24th June 2025
50AQI
25th June 2025
43AQI
26th June 2025
32AQI
27th June 2025
32AQI
28th June 2025
33AQI
29th June 2025
32AQI
30th June 2025
33AQI
1st July 2025
33AQI
2nd July 2025
28AQI
3rd July 2025
27AQI
4th July 2025
25AQI
5th July 2025
40AQI
6th July 2025
29AQI
7th July 2025
29AQI
8th July 2025
31AQI
9th July 2025
32AQI
10th July 2025
34AQI
11th July 2025
39AQI
12th July 2025
57AQI
13th July 2025
47AQI
14th July 2025
33AQI
15th July 2025
32AQI
16th July 2025
45AQI
17th July 2025
53AQI
18th July 2025
51AQI
19th July 2025
44AQI
20th July 2025
33AQI
21st July 2025
28AQI
22nd July 2025
27AQI
23rd July 2025
25AQI
24th July 2025
31AQI
25th July 2025
36AQI
26th July 2025
40AQI
27th July 2025
28AQI
28th July 2025
29AQI
29th July 2025
49AQI
30th July 2025
42AQI
31st July 2025
55AQI
1st August 2025
52AQI
2nd August 2025
36AQI
3rd August 2025
26AQI
4th August 2025
39AQI
5th August 2025
54AQI
6th August 2025
67AQI
7th August 2025
52AQI
8th August 2025
47AQI
9th August 2025
44AQI
10th August 2025
41AQI
11th August 2025
37AQI
12th August 2025
35AQI
13th August 2025
48AQI
14th August 2025
59AQI
15th August 2025
57AQI
16th August 2025
48AQI
17th August 2025
30AQI
18th August 2025
35AQI
19th August 2025
23AQI
20th August 2025
32AQI
21st August 2025
42AQI
22nd August 2025
40AQI
23rd August 2025
41AQI
24th August 2025
44AQI
25th August 2025
46AQI
26th August 2025
48AQI
27th August 2025
43AQI
28th August 2025
38AQI
29th August 2025
42AQI
30th August 2025
46AQI
31st August 2025
40AQI
1st September 2025
40AQI
2nd September 2025
44AQI
3rd September 2025
54AQI
4th September 2025
66AQI
5th September 2025
77AQI
6th September 2025
68AQI
7th September 2025
55AQI
8th September 2025
37AQI
9th September 2025
35AQI
10th September 2025
27AQI
11th September 2025
24AQI
12th September 2025
20AQI
13th September 2025
17AQI
14th September 2025
17AQI
15th September 2025
21AQI
16th September 2025
22AQI
17th September 2025
19AQI
18th September 2025
20AQI
19th September 2025
27AQI
20th September 2025
28AQI
21st September 2025
24AQI
22nd September 2025
21AQI
23rd September 2025
22AQI
24th September 2025
30AQI
25th September 2025
22AQI
26th September 2025
21AQI
27th September 2025
22AQI
28th September 2025
24AQI
29th September 2025
13AQI
30th September 2025
16AQI
1st October 2025
25AQI
2nd October 2025
37AQI
3rd October 2025
38AQI
4th October 2025
34AQI
5th October 2025
25AQI
6th October 2025
25AQI
7th October 2025
48AQI
8th October 2025
54AQI
9th October 2025
47AQI
10th October 2025
36AQI
11th October 2025
52AQI
12th October 2025
38AQI
13th October 2025
21AQI
14th October 2025
37AQI
15th October 2025
46AQI
16th October 2025
34AQI
17th October 2025
28AQI
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

28AQI

28AQI

23AQI

32AQI

37AQI

43AQI

31AQI

37AQI


No. of days

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

202533AQI

6
29
1
31
30
27
4
25
6
25
5
15
2
188
18

Highest AQI recorded in

August

43AQI


Lowest AQI recorded in

May

23AQI


Most & Least Polluted Years Over the Last 1 Years

Most Polluted Year Recorded
2025(Avg.)
33AQI
Least Polluted Year Recorded
2025(Avg.)
33AQI


Reservoir Road's annual 2025 AQI (33) shows an average percentage change of NaN% (improved AQI) compared to previous years: .