Northwest, Denver, 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
Northwest, Denver, Colorado, United States
AQI Trends: Highest and Lowest
Same Day Analysis (29th October ):
On this day, AQI across the 1 years varied significantly: 2025 ranks 1st highest AQI at 20 of Good air quality on the same day.
Download 2024 Annual Data
World Air Quality Report

Day & Night AQI Trend: 29th Oct - 30th Oct 2025
Northwest, Denver, Colorado, United States
7 AM29th Oct 2025
6 PM
6 AM30th Oct 2025
22AQI
17AQI
33AQI
20AQI
In the last 24 hours,
Northwest's AQI reached its highest point of 33 at 11 PM during the Night, while the lowest point, 17, was recorded at 2 PM during the Day between 29th Oct and 30th Oct 2025.
Day & Night AQI Trend : Sep - Oct 2025
Northwest, Denver, Colorado, United States
17°C10/26°C
20°C12/27°C
20°C11/29°C
21°C11/32°C
21°C16/29°C
13°C8/19°C
10°C8/12°C
12°C7/17°C
17°C6/28°C
19°C10/29°C
16°C13/21°C
16°C13/21°C
16°C11/23°C
12°C7/19°C
16°C7/28°C
18°C10/29°C
16°C11/24°C
13°C5/20°C
11°C6/19°C
14°C3/27°C
12°C8/18°C
11°C2/21°C
14°C5/23°C
14°C6/23°C
13°C7/20°C
14°C4/24°C
14°C7/24°C
13°C5/21°C
5°C0/10°C
6°C-1/17°C
--°C/°C
34AQI
25AQI
31AQI
24AQI
2025 Days Vs Air Quality
Northwest, Denver, Colorado, United States
92%
201
8%
17
Total number of days with different AQI categories in last 303 days in 2025 (62 days remaining)
Under WHO’s Safe Air Quality Limits: 92%
Health Risk Level:
Very Low
In 2025, 92% of 303 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
Northwest, Denver, Colorado, United States
AQI levels in 2025
Jan.
Feb.
Mar.
Apr.
May
Jun.
Jul.
Aug.
Sep.
Oct.
Nov.
Dec.
27AQI
21AQI
26AQI
19AQI
26AQI
38AQI
28AQI
18AQI
19AQI
28AQI
27AQI
26AQI
28AQI
26AQI
39AQI
42AQI
40AQI
30AQI
23AQI
19AQI
35AQI
25AQI
25AQI
15AQI
23AQI
19AQI
15AQI
20AQI
31AQI
55AQI
27AQI
26AQI
27AQI
16AQI
15AQI
17AQI
16AQI
20AQI
21AQI
21AQI
16AQI
17AQI
21AQI
28AQI
27AQI
27AQI
23AQI
22AQI
25AQI
33AQI
15AQI
16AQI
19AQI
34AQI
14AQI
15AQI
21AQI
23AQI
32AQI
47AQI
17AQI
19AQI
36AQI
26AQI
19AQI
23AQI
28AQI
32AQI
27AQI
20AQI
36AQI
37AQI
36AQI
24AQI
33AQI
52AQI
38AQI
27AQI
24AQI
26AQI
33AQI
28AQI
28AQI
31AQI
29AQI
27AQI
32AQI
35AQI
37AQI
40AQI
47AQI
38AQI
28AQI
29AQI
34AQI
33AQI
33AQI
32AQI
27AQI
26AQI
24AQI
44AQI
30AQI
29AQI
30AQI
31AQI
35AQI
38AQI
59AQI
49AQI
31AQI
30AQI
44AQI
54AQI
53AQI
47AQI
34AQI
31AQI
29AQI
25AQI
30AQI
38AQI
41AQI
27AQI
30AQI
49AQI
40AQI
55AQI
54AQI
36AQI
25AQI
36AQI
52AQI
67AQI
50AQI
46AQI
44AQI
41AQI
36AQI
33AQI
46AQI
60AQI
59AQI
49AQI
30AQI
36AQI
22AQI
30AQI
41AQI
42AQI
42AQI
46AQI
46AQI
50AQI
43AQI
37AQI
41AQI
45AQI
40AQI
39AQI
44AQI
53AQI
64AQI
78AQI
70AQI
61AQI
35AQI
30AQI
25AQI
23AQI
20AQI
16AQI
20AQI
21AQI
22AQI
19AQI
20AQI
28AQI
28AQI
26AQI
22AQI
22AQI
32AQI
28AQI
24AQI
21AQI
20AQI
20AQI
16AQI
19AQI
29AQI
30AQI
20AQI
13AQI
10AQI
48AQI
48AQI
34AQI
38AQI
54AQI
27AQI
13AQI
34AQI
49AQI
20AQI
15AQI
27AQI
22AQI
24AQI
23AQI
26AQI
35AQI
37AQI
25AQI
30AQI
37AQI
13AQI
20AQI
26AQI
26AQI
23AQI
32AQI
37AQI
43AQI
32AQI
28AQI
No. of days
202532AQI
Highest AQI recorded in
August43AQI
Lowest AQI recorded in
May23AQI
Most & Least Polluted Years Over the Last 1 Years
Northwest's annual 2025 AQI (32) shows an average percentage change of NaN% (improved AQI) compared to previous years: .