Littleton, 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
Littleton, Colorado, United States
AQI Trends: Highest and Lowest
Same Day Analysis (26th October ):
On this day, AQI across the 1 years varied significantly: 2025 ranks 1st highest AQI at 19 of Good air quality on the same day.
Download 2024 Annual Data
World Air Quality Report

Day & Night AQI Trend: 26th Oct - 27th Oct 2025
Littleton, Colorado, United States
7 AM26th Oct 2025
6 PM
6 AM27th Oct 2025
21AQI
14AQI
38AQI
19AQI
In the last 24 hours,
Littleton's AQI reached its highest point of 38 at 12 AM during the Night, while the lowest point, undefined, was recorded at 6 AM during the Night between 26th Oct and 27th Oct 2025.
Day & Night AQI Trend : Sep - Oct 2025
Littleton, Colorado, United States
19°C13/29°C
18°C10/26°C
18°C13/24°C
17°C10/26°C
19°C11/27°C
20°C11/29°C
21°C11/32°C
21°C14/29°C
13°C7/18°C
9°C7/12°C
12°C8/16°C
17°C6/28°C
19°C10/30°C
17°C12/23°C
16°C13/23°C
15°C10/22°C
12°C6/18°C
16°C7/26°C
18°C9/29°C
16°C9/24°C
12°C4/19°C
9°C4/19°C
13°C2/27°C
11°C6/18°C
11°C2/21°C
14°C6/23°C
13°C6/21°C
12°C7/19°C
13°C4/23°C
14°C6/23°C
--°C/°C
30AQI
22AQI
29AQI
21AQI
2025 Days Vs Air Quality
Littleton, Colorado, United States
95%
205
5%
10
Total number of days with different AQI categories in last 300 days in 2025 (65 days remaining)
Under WHO’s Safe Air Quality Limits: 95%
Health Risk Level:
Very Low
In 2025, 95% of 300 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
Littleton, Colorado, United States
AQI levels in 2025
Jan.
Feb.
Mar.
Apr.
May
Jun.
Jul.
Aug.
Sep.
Oct.
Nov.
Dec.
20AQI
18AQI
21AQI
18AQI
23AQI
32AQI
24AQI
18AQI
18AQI
25AQI
25AQI
21AQI
24AQI
21AQI
34AQI
42AQI
36AQI
27AQI
24AQI
21AQI
30AQI
24AQI
22AQI
14AQI
19AQI
16AQI
14AQI
17AQI
27AQI
53AQI
28AQI
29AQI
26AQI
17AQI
14AQI
14AQI
14AQI
18AQI
18AQI
18AQI
15AQI
13AQI
17AQI
24AQI
21AQI
22AQI
18AQI
20AQI
24AQI
29AQI
16AQI
15AQI
17AQI
26AQI
16AQI
16AQI
18AQI
21AQI
29AQI
40AQI
26AQI
25AQI
31AQI
22AQI
15AQI
20AQI
24AQI
23AQI
22AQI
18AQI
26AQI
30AQI
25AQI
22AQI
31AQI
40AQI
30AQI
23AQI
24AQI
26AQI
29AQI
27AQI
27AQI
27AQI
23AQI
26AQI
29AQI
33AQI
33AQI
37AQI
45AQI
34AQI
23AQI
26AQI
27AQI
27AQI
29AQI
25AQI
23AQI
24AQI
22AQI
32AQI
24AQI
22AQI
24AQI
24AQI
27AQI
35AQI
52AQI
40AQI
26AQI
26AQI
39AQI
50AQI
47AQI
36AQI
24AQI
22AQI
20AQI
20AQI
23AQI
34AQI
37AQI
26AQI
24AQI
45AQI
35AQI
53AQI
49AQI
30AQI
22AQI
31AQI
44AQI
53AQI
38AQI
34AQI
37AQI
36AQI
29AQI
27AQI
40AQI
54AQI
52AQI
47AQI
33AQI
30AQI
19AQI
24AQI
36AQI
39AQI
37AQI
41AQI
44AQI
42AQI
32AQI
28AQI
32AQI
41AQI
38AQI
38AQI
39AQI
47AQI
55AQI
78AQI
67AQI
57AQI
30AQI
25AQI
20AQI
18AQI
16AQI
14AQI
16AQI
19AQI
20AQI
18AQI
18AQI
22AQI
23AQI
18AQI
16AQI
17AQI
23AQI
22AQI
20AQI
18AQI
20AQI
16AQI
12AQI
16AQI
25AQI
27AQI
20AQI
13AQI
18AQI
50AQI
44AQI
33AQI
38AQI
49AQI
28AQI
14AQI
31AQI
50AQI
23AQI
18AQI
31AQI
23AQI
24AQI
21AQI
20AQI
29AQI
27AQI
20AQI
19AQI
22AQI
24AQI
21AQI
28AQI
31AQI
37AQI
27AQI
27AQI
No. of days
202528AQI
Highest AQI recorded in
August37AQI
Lowest AQI recorded in
May21AQI
Most & Least Polluted Years Over the Last 1 Years
Littleton's annual 2025 AQI (28) shows an average percentage change of NaN% (improved AQI) compared to previous years: .