Thornton, 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
Thornton, Colorado, United States
AQI Trends: Highest and Lowest
Same Day Analysis (3rd October ):
On this day, AQI across the 1 years varied significantly: 2025 ranks 1st highest AQI at 56 of Moderate air quality on the same day.
Download 2024 Annual Data
World Air Quality Report

Day & Night AQI Trend: 2nd Oct - 3rd Oct 2025
Thornton, Colorado, United States
6 AM2nd Oct 2025
7 PM
5 AM3rd Oct 2025
98AQI
31AQI
57AQI
34AQI
In the last 24 hours,
Thornton's AQI reached its highest point of 98 at 10 AM during the Day, while the lowest point, 31, was recorded at 6 PM during the Day between 2nd Oct and 3rd Oct 2025.
Day & Night AQI Trend : Sep - Oct 2025
Thornton, Colorado, United States
--°C/°C
25°C16/33°C
17°C14/23°C
19°C10/30°C
24°C18/31°C
24°C18/33°C
21°C15/30°C
22°C15/34°C
23°C18/33°C
21°C16/29°C
19°C14/25°C
16°C13/23°C
21°C13/31°C
18°C14/27°C
16°C12/23°C
18°C11/25°C
19°C11/28°C
19°C14/27°C
22°C14/29°C
18°C14/25°C
11°C10/12°C
16°C9/22°C
19°C8/28°C
20°C10/30°C
20°C13/29°C
19°C12/25°C
18°C13/27°C
17°C9/26°C
20°C13/28°C
20°C11/29°C
21°C12/31°C
47AQI
29AQI
34AQI
30AQI
2025 Days Vs Air Quality
Thornton, Colorado, United States
90%
173
10%
19
Total number of days with different AQI categories in last 277 days in 2025 (88 days remaining)
Under WHO’s Safe Air Quality Limits: 90%
Health Risk Level:
Very Low
In 2025, 90% of 277 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
Thornton, Colorado, United States
AQI levels in 2025
Jan.
Feb.
Mar.
Apr.
May
Jun.
Jul.
Aug.
Sep.
Oct.
Nov.
Dec.
38AQI
38AQI
35AQI
21AQI
23AQI
44AQI
28AQI
18AQI
20AQI
23AQI
29AQI
28AQI
34AQI
34AQI
43AQI
48AQI
48AQI
39AQI
27AQI
20AQI
37AQI
34AQI
34AQI
13AQI
25AQI
28AQI
20AQI
25AQI
34AQI
57AQI
24AQI
26AQI
38AQI
18AQI
20AQI
22AQI
16AQI
21AQI
25AQI
25AQI
23AQI
19AQI
23AQI
34AQI
32AQI
32AQI
27AQI
28AQI
36AQI
38AQI
15AQI
17AQI
20AQI
33AQI
14AQI
17AQI
18AQI
25AQI
32AQI
43AQI
16AQI
19AQI
34AQI
23AQI
20AQI
26AQI
28AQI
31AQI
24AQI
19AQI
36AQI
38AQI
28AQI
23AQI
31AQI
50AQI
42AQI
29AQI
29AQI
31AQI
34AQI
29AQI
33AQI
29AQI
28AQI
32AQI
36AQI
39AQI
39AQI
37AQI
49AQI
38AQI
31AQI
33AQI
39AQI
35AQI
32AQI
36AQI
32AQI
28AQI
26AQI
41AQI
30AQI
31AQI
34AQI
36AQI
37AQI
40AQI
57AQI
50AQI
38AQI
35AQI
44AQI
50AQI
52AQI
49AQI
36AQI
34AQI
32AQI
27AQI
31AQI
35AQI
42AQI
30AQI
35AQI
49AQI
42AQI
55AQI
54AQI
39AQI
26AQI
38AQI
56AQI
77AQI
61AQI
55AQI
50AQI
41AQI
39AQI
40AQI
48AQI
57AQI
58AQI
53AQI
32AQI
38AQI
25AQI
35AQI
44AQI
42AQI
43AQI
46AQI
47AQI
50AQI
44AQI
33AQI
42AQI
45AQI
40AQI
39AQI
46AQI
56AQI
71AQI
78AQI
69AQI
59AQI
37AQI
35AQI
29AQI
27AQI
23AQI
19AQI
18AQI
23AQI
25AQI
19AQI
20AQI
31AQI
32AQI
24AQI
22AQI
20AQI
31AQI
33AQI
35AQI
26AQI
22AQI
29AQI
21AQI
35AQI
52AQI
56AQI
33AQI
30AQI
25AQI
33AQI
39AQI
45AQI
34AQI
48AQI
No. of days
202535AQI
Highest AQI recorded in
October48AQI
Lowest AQI recorded in
May25AQI
Most & Least Polluted Years Over the Last 1 Years
Thornton's annual 2025 AQI (35) shows an average percentage change of NaN% (improved AQI) compared to previous years: .