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!
October Air Quality Analysis
Reservoir Road, Boulder, Colorado, United States
AQI Trends: Highest and Lowest
Same Day Analysis (18th October ):
On this day, AQI across the 1 years varied significantly: 2025 ranks 1st highest AQI at 41 of Good air quality on the same day.
Download 2024 Annual Data
World Air Quality Report

Day & Night AQI Trend: 17th Oct - 18th Oct 2025
Reservoir Road, Boulder, Colorado, United States
7 AM17th Oct 2025
6 PM
6 AM18th Oct 2025
33AQI
13AQI
50AQI
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
15°C8/23°C
17°C8/26°C
16°C11/25°C
19°C11/27°C
18°C13/23°C
9°C6/13°C
13°C5/22°C
17°C8/26°C
19°C12/28°C
19°C14/25°C
17°C12/23°C
15°C11/22°C
15°C8/23°C
19°C15/26°C
19°C12/26°C
21°C12/29°C
19°C12/26°C
11°C8/17°C
7°C4/9°C
10°C5/15°C
17°C10/26°C
16°C9/26°C
14°C11/18°C
15°C11/19°C
15°C10/21°C
9°C4/14°C
11°C3/19°C
14°C8/22°C
13°C7/21°C
12°C6/19°C
--°C/°C
34AQI
26AQI
35AQI
28AQI
2025 Days Vs Air Quality
Reservoir Road, Boulder, Colorado, United States
91%
189
9%
18
Total number of days with different AQI categories in last 291 days in 2025 (74 days remaining)
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
Jan.
Feb.
Mar.
Apr.
May
Jun.
Jul.
Aug.
Sep.
Oct.
Nov.
Dec.
27AQI
25AQI
29AQI
20AQI
27AQI
42AQI
29AQI
18AQI
20AQI
29AQI
32AQI
26AQI
31AQI
31AQI
42AQI
45AQI
42AQI
31AQI
25AQI
18AQI
37AQI
28AQI
26AQI
14AQI
24AQI
21AQI
17AQI
21AQI
35AQI
57AQI
28AQI
28AQI
30AQI
17AQI
17AQI
19AQI
17AQI
20AQI
21AQI
22AQI
17AQI
19AQI
24AQI
29AQI
27AQI
25AQI
20AQI
23AQI
28AQI
34AQI
15AQI
16AQI
19AQI
34AQI
14AQI
17AQI
20AQI
24AQI
32AQI
46AQI
17AQI
18AQI
34AQI
25AQI
18AQI
24AQI
26AQI
30AQI
25AQI
21AQI
37AQI
38AQI
33AQI
22AQI
31AQI
49AQI
37AQI
28AQI
26AQI
26AQI
32AQI
26AQI
27AQI
31AQI
27AQI
30AQI
32AQI
33AQI
34AQI
40AQI
50AQI
43AQI
32AQI
32AQI
33AQI
32AQI
33AQI
33AQI
28AQI
27AQI
25AQI
40AQI
29AQI
29AQI
31AQI
32AQI
34AQI
39AQI
57AQI
47AQI
33AQI
32AQI
45AQI
53AQI
51AQI
44AQI
33AQI
28AQI
27AQI
25AQI
31AQI
36AQI
40AQI
28AQI
29AQI
49AQI
42AQI
55AQI
52AQI
36AQI
26AQI
39AQI
54AQI
67AQI
52AQI
47AQI
44AQI
41AQI
37AQI
35AQI
48AQI
59AQI
57AQI
48AQI
30AQI
35AQI
23AQI
32AQI
42AQI
40AQI
41AQI
44AQI
46AQI
48AQI
43AQI
38AQI
42AQI
46AQI
40AQI
40AQI
44AQI
54AQI
66AQI
77AQI
68AQI
55AQI
37AQI
35AQI
27AQI
24AQI
20AQI
17AQI
17AQI
21AQI
22AQI
19AQI
20AQI
27AQI
28AQI
24AQI
21AQI
22AQI
30AQI
22AQI
21AQI
22AQI
24AQI
13AQI
16AQI
25AQI
37AQI
38AQI
34AQI
25AQI
25AQI
48AQI
54AQI
47AQI
36AQI
52AQI
38AQI
21AQI
37AQI
46AQI
34AQI
28AQI
41AQI
28AQI
28AQI
23AQI
32AQI
37AQI
43AQI
31AQI
37AQI
No. of days
202533AQI
Highest AQI recorded in
August43AQI
Lowest AQI recorded in
May23AQI
Most & Least Polluted Years Over the Last 1 Years
Reservoir Road's annual 2025 AQI (33) shows an average percentage change of NaN% (improved AQI) compared to previous years: .