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All data are collected real-time and have not been corrected nor validated.
Hourly averages in PPB for 09/16/2025
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| *Hour (MST) |
ACAD | **ASPN | AURE | BHWK | BOUR | CAMP | CASA | CHAT | CTZ | EVG | FOS | FTC | FTCW | GRET | HLD | LAST | MAN | MFP | NREL | PAL | PWES | RFN | RIFLO3 | TIM | WBY | |
| 1:00 AM | 1hr 8hr AQI |
17 32 30 |
35 33 31 |
44 48 44 |
42 45 42 |
25 36 33 |
36 43 40 |
42 39 |
37 42 39 |
24 29 27 |
36 36 33 |
41 40 37 |
42 29 27 |
35 46 43 |
32 38 35 |
36 43 40 |
12 36 33 |
41 42 39 |
39 46 43 |
43 45 42 |
32 40 37 |
35 40 37 |
46 52 48 |
17 20 19 |
40 35 32 |
30 35 32 |
| 2:00 AM | 1hr 8hr AQI |
19 28 26 |
35 32 30 |
42 48 44 |
42 44 41 |
31 34 31 |
32 41 38 |
41 38 |
35 40 37 |
26 26 24 |
33 35 32 |
45 39 36 |
45 30 28 |
37 44 41 |
38 36 33 |
37 41 38 |
24 32 30 |
44 41 38 |
39 45 42 |
44 44 41 |
27 37 34 |
37 38 35 |
41 49 45 |
19 17 16 |
41 33 31 |
33 33 31 |
| 3:00 AM | 1hr 8hr AQI |
22 26 24 |
34 32 30 |
39 46 43 |
42 43 40 |
29 32 30 |
28 38 35 |
37 40 37 |
21 24 22 |
32 34 31 |
45 39 36 |
42 31 29 |
37 42 39 |
38 35 32 |
32 40 37 |
33 30 28 |
44 41 38 |
38 43 40 |
45 43 40 |
27 35 32 |
33 37 34 |
44 47 44 |
13 16 15 |
45 34 31 |
36 32 30 |
|
| 4:00 AM | 1hr 8hr AQI |
21 24 22 |
33 32 30 |
33 45 42 |
42 43 40 |
31 31 29 |
31 36 33 |
38 |
42 40 37 |
23 22 20 |
30 33 31 |
41 38 35 |
39 33 31 |
37 40 37 |
37 34 31 |
34 38 35 |
32 29 27 |
45 41 38 |
38 42 39 |
42 43 40 |
26 33 31 |
26 35 32 |
44 46 43 |
11 15 14 |
41 35 32 |
36 31 29 |
| 5:00 AM | 1hr 8hr AQI |
27 23 21 |
33 32 30 |
28 42 39 |
42 43 40 |
30 29 27 |
35 35 32 |
29 |
30 38 35 |
23 22 20 |
30 33 31 |
32 37 34 |
35 36 33 |
35 38 35 |
38 33 31 |
34 37 34 |
31 28 26 |
45 42 39 |
37 40 37 |
38 42 39 |
25 30 28 |
24 33 31 |
46 46 43 |
9 15 14 |
37 35 32 |
21 30 28 |
| 6:00 AM | 1hr 8hr AQI |
28 22 20 |
32 32 30 |
29 39 36 |
41 42 39 |
27 28 26 |
24 33 31 |
20 |
28 36 33 |
22 22 20 |
30 32 30 |
30 36 33 |
25 36 33 |
34 37 34 |
39 34 31 |
24 34 31 |
33 27 25 |
39 42 39 |
31 38 35 |
37 41 38 |
25 29 27 |
19 31 29 |
45 45 42 |
6 13 12 |
34 35 32 |
1 27 25 |
| 7:00 AM | 1hr 8hr AQI |
35 24 22 |
29 32 30 |
27 36 33 |
39 41 38 |
19 27 25 |
14 29 27 |
15 |
27 34 31 |
17 22 20 |
27 31 29 |
27 35 32 |
20 35 32 |
34 36 33 |
33 35 32 |
25 32 30 |
25 26 24 |
34 41 38 |
27 36 33 |
37 41 38 |
23 27 25 |
21 29 27 |
43 44 41 |
4 11 10 |
27 35 32 |
4 23 21 |
| 8:00 AM | 1hr 8hr AQI |
36 25 23 |
16 30 28 |
35 34 31 |
37 40 37 |
26 27 25 |
14 26 24 |
18 |
29 33 31 |
23 22 20 |
31 31 29 |
22 35 32 |
28 34 31 |
35 35 32 |
32 35 32 |
31 31 29 |
29 27 25 |
27 39 36 |
18 33 31 |
41 40 37 |
26 26 24 |
33 28 26 |
45 44 41 |
11 11 10 |
25 36 33 |
15 22 20 |
| 9:00 AM | 1hr 8hr AQI |
44 29 27 |
13 27 25 |
42 34 31 |
40 40 37 |
42 29 27 |
26 25 23 |
34 25 23 |
37 33 31 |
27 22 20 |
44 32 30 |
31 34 31 |
39 34 31 |
43 36 33 |
37 36 33 |
37 31 29 |
40 30 28 |
35 39 36 |
30 32 30 |
42 40 37 |
30 26 24 |
40 29 27 |
43 43 40 |
16 11 10 |
35 35 32 |
40 23 21 |
| 10:00 AM | 1hr 8hr AQI |
49 32 30 |
29 26 24 |
45 34 31 |
44 40 37 |
48 31 29 |
45 27 25 |
47 28 26 |
44 34 31 |
39 24 22 |
49 34 31 |
47 34 31 |
45 34 31 |
49 38 35 |
43 37 34 |
38 31 29 |
44 33 31 |
46 39 36 |
42 32 30 |
47 41 38 |
35 27 25 |
43 29 27 |
49 44 41 |
25 11 10 |
45 36 33 |
47 25 23 |
| 11:00 AM | 1hr 8hr AQI |
53 36 33 |
42 27 25 |
53 36 33 |
48 41 38 |
50 34 31 |
46 29 27 |
47 31 29 |
47 35 32 |
46 27 25 |
52 36 33 |
52 35 32 |
49 35 32 |
52 39 36 |
48 38 35 |
43 33 31 |
47 35 32 |
52 40 37 |
50 34 31 |
53 42 39 |
42 29 27 |
50 32 30 |
52 45 42 |
30 14 13 |
53 37 34 |
46 26 24 |
| 12:00 PM | 1hr 8hr AQI |
56 41 38 |
33 27 25 |
56 39 36 |
52 42 39 |
52 36 33 |
47 31 29 |
47 32 30 |
54 37 34 |
47 30 28 |
55 39 36 |
55 37 34 |
53 36 33 |
55 42 39 |
50 40 37 |
33 31 |
50 37 34 |
54 41 38 |
54 36 33 |
55 43 40 |
47 31 29 |
55 35 32 |
54 47 44 |
36 17 16 |
56 39 36 |
48 27 25 |
| 1:00 PM | 1hr 8hr AQI |
55 44 41 |
38 28 26 |
56 42 39 |
54 44 41 |
53 39 36 |
50 33 31 |
50 34 31 |
56 40 37 |
48 33 31 |
59 43 40 |
53 39 36 |
54 39 36 |
57 44 41 |
52 41 38 |
33 31 |
52 40 37 |
53 42 39 |
55 38 35 |
56 46 43 |
51 34 31 |
59 40 37 |
57 48 44 |
38 20 19 |
53 41 38 |
50 31 29 |
| 2:00 PM | 1hr 8hr AQI |
57 48 44 |
41 29 27 |
57 46 43 |
52 45 42 |
52 42 39 |
49 36 33 |
49 38 35 |
55 43 40 |
49 37 34 |
54 46 43 |
53 42 39 |
48 42 39 |
52 47 44 |
54 43 40 |
54 42 39 |
54 44 41 |
53 41 38 |
54 48 44 |
52 38 35 |
54 44 41 |
57 50 46 |
43 25 23 |
55 43 40 |
51 37 34 |
|
| 3:00 PM | 1hr 8hr AQI |
53 50 46 |
38 30 28 |
54 49 45 |
49 47 44 |
50 46 43 |
47 40 37 |
47 42 39 |
52 46 43 |
49 41 38 |
47 48 44 |
51 45 42 |
46 45 42 |
48 48 44 |
53 46 43 |
46 |
51 45 42 |
53 46 43 |
52 44 41 |
48 49 45 |
51 41 38 |
53 48 44 |
51 51 47 |
42 30 28 |
54 47 44 |
45 42 39 |
| 4:00 PM | 1hr 8hr AQI |
45 51 47 |
44 34 31 |
56 52 48 |
49 48 44 |
53 50 46 |
44 44 41 |
47 46 43 |
54 49 45 |
47 44 41 |
52 51 47 |
44 48 44 |
39 46 43 |
47 50 46 |
49 48 44 |
47 |
47 48 44 |
51 49 45 |
47 47 44 |
53 51 47 |
52 45 42 |
54 51 47 |
50 51 47 |
42 34 31 |
46 49 45 |
47 46 43 |
| 5:00 PM | 1hr 8hr AQI |
41 51 47 |
47 38 35 |
58 54 50 |
50 49 45 |
52 51 47 |
44 46 43 |
51 48 44 |
55 52 48 |
47 46 43 |
47 51 47 |
45 50 46 |
40 46 43 |
42 50 46 |
48 49 45 |
49 |
49 49 45 |
46 51 47 |
47 50 46 |
54 52 48 |
52 47 44 |
52 52 48 |
57 53 49 |
44 37 34 |
47 51 47 |
50 48 44 |
| 6:00 PM | 1hr 8hr AQI |
36 49 45 |
46 40 37 |
53 55 51 |
49 50 46 |
51 51 47 |
44 46 43 |
49 48 44 |
54 53 49 |
51 48 44 |
32 49 45 |
44 49 45 |
39 46 43 |
42 49 45 |
47 50 46 |
47 |
46 49 45 |
45 51 47 |
49 50 46 |
53 53 49 |
51 49 45 |
50 53 49 |
52 53 49 |
49 40 37 |
41 50 46 |
47 48 44 |
| 7:00 PM | 1hr 8hr AQI |
32 46 43 |
40 40 37 |
48 54 50 |
50 50 46 |
48 51 47 |
43 46 43 |
46 48 44 |
49 53 49 |
44 47 44 |
46 49 45 |
47 49 45 |
45 45 42 |
44 48 44 |
47 50 46 |
41 |
45 49 45 |
41 49 45 |
47 50 46 |
49 52 48 |
53 51 47 |
46 52 48 |
49 53 49 |
46 42 39 |
49 50 46 |
43 47 44 |
| 8:00 PM | 1hr 8hr AQI |
36 44 41 |
37 40 37 |
46 53 49 |
47 50 46 |
46 50 46 |
38 44 41 |
39 47 44 |
41 52 48 |
32 45 42 |
49 48 44 |
41 47 44 |
39 43 40 |
39 46 43 |
47 49 45 |
39 44 41 |
47 48 44 |
38 47 44 |
42 49 45 |
47 51 47 |
52 51 47 |
44 51 47 |
48 52 48 |
39 42 39 |
45 48 44 |
41 46 43 |
| 9:00 PM | 1hr 8hr AQI |
41 42 39 |
32 39 36 |
45 52 48 |
51 49 45 |
48 50 46 |
42 43 40 |
46 46 43 |
29 48 44 |
26 43 40 |
48 46 43 |
36 45 42 |
30 40 37 |
41 44 41 |
46 48 44 |
34 43 40 |
42 47 44 |
46 46 43 |
48 48 44 |
46 50 46 |
50 51 47 |
41 49 45 |
50 51 47 |
36 42 39 |
41 47 44 |
41 45 42 |
| 10:00 PM | 1hr 8hr AQI |
40 40 37 |
33 38 35 |
48 51 47 |
48 49 45 |
45 49 45 |
48 43 40 |
47 46 43 |
41 46 43 |
23 39 36 |
41 45 42 |
44 41 |
31 38 35 |
34 42 39 |
46 47 44 |
38 42 39 |
44 46 43 |
45 45 42 |
42 46 43 |
42 49 45 |
50 51 47 |
43 47 44 |
44 50 46 |
33 41 38 |
38 45 42 |
49 45 42 |
| 11:00 PM | 1hr 8hr AQI |
41 39 36 |
31 38 35 |
50 50 46 |
41 48 44 |
38 47 44 |
50 44 41 |
33 44 41 |
40 45 42 |
18 36 33 |
31 43 40 |
29 40 37 |
29 36 33 |
38 40 37 |
49 47 44 |
34 41 38 |
49 46 43 |
47 44 41 |
42 45 42 |
38 47 44 |
48 51 47 |
43 46 43 |
38 48 44 |
33 40 37 |
37 43 40 |
39 44 41 |
| 12:00 AM | 1hr 8hr AQI |
38 38 35 |
29 36 33 |
45 49 45 |
48 44 |
36 45 42 |
36 43 40 |
31 42 39 |
41 43 40 |
20 32 30 |
25 39 36 |
27 38 35 |
23 34 31 |
29 38 35 |
46 47 44 |
38 40 37 |
47 46 43 |
42 43 40 |
36 44 41 |
32 45 42 |
46 50 46 |
39 44 41 |
40 47 44 |
32 39 36 |
34 41 38 |
35 43 40 |
| Max Value | 1hr 8hr AQI |
57 51 47 |
47 40 37 |
58 55 51 |
54 50 46 |
53 51 47 |
50 46 43 |
51 48 44 |
56 53 49 |
51 48 44 |
59 51 47 |
55 50 46 |
54 46 43 |
57 50 46 |
54 50 46 |
49 44 41 |
54 49 45 |
54 51 47 |
55 50 46 |
56 53 49 |
53 51 47 |
59 53 49 |
57 53 49 |
49 42 39 |
56 51 47 |
51 48 44 |
| *Hour (MST) |
ACAD | **ASPN | AURE | BHWK | BOUR | CAMP | CASA | CHAT | CTZ | EVG | FOS | FTC | FTCW | GRET | HLD | LAST | MAN | MFP | NREL | PAL | PWES | RFN | RIFLO3 | TIM | WBY |
| Key: | [blank] | [ - ] (diagnostic) | [Yellow] | [Orange] |
| no data available/reported | reported data below zero | highest value for the hour | highest value for the day |
* All data are reported in Mountain Standard Time (MST). During daylight savings time add one hour to the reported hour.
** ASPN - These data are provided courtesy of the city of Aspen.