Northwest St. Louis, Minnesota, 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 St. Louis, Minnesota, United States
AQI Trends: Highest and Lowest
Same Day Analysis (16th October ):
On this day, AQI across the 1 years varied significantly: 2025 ranks 1st highest AQI at 35 of Good air quality on the same day.
Download 2024 Annual Data
World Air Quality Report

Day & Night AQI Trend: 16th Oct - 17th Oct 2025
Northwest St. Louis, Minnesota, United States
7 AM16th Oct 2025
6 PM
6 AM17th Oct 2025
46AQI
16AQI
56AQI
42AQI
In the last 24 hours,
Northwest St. Louis's AQI reached its highest point of 56 at 3 AM during the Night, while the lowest point, 16, was recorded at 1 PM during the Day between 16th Oct and 17th Oct 2025.
Day & Night AQI Trend : Sep - Oct 2025
Northwest St. Louis, Minnesota, United States
18°C13/23°C
17°C14/20°C
15°C14/16°C
16°C12/24°C
17°C16/20°C
17°C15/22°C
16°C11/24°C
17°C8/26°C
17°C13/22°C
13°C3/22°C
16°C10/22°C
18°C11/26°C
18°C10/26°C
19°C14/26°C
20°C15/26°C
21°C18/27°C
18°C9/27°C
24°C20/29°C
20°C11/24°C
9°C6/13°C
8°C5/11°C
7°C-3/17°C
14°C6/20°C
12°C8/16°C
10°C2/19°C
15°C13/18°C
8°C6/11°C
6°C1/9°C
9°C6/14°C
11°C7/13°C
--°C/°C
33AQI
27AQI
34AQI
30AQI
2025 Days Vs Air Quality
Northwest St. Louis, Minnesota, United States
80%
163
16%
33
2%
5
1%
3
Total number of days with different AQI categories in last 290 days in 2025 (75 days remaining)
Under WHO’s Safe Air Quality Limits: 80%
Health Risk Level:
Low
In 2025, 80% of 290 days were within WHO’s safe air quality limits. The risk of health issues is Low, but the long-term effects, especially on vulnerable individuals, remain uncertain.
Annual Air Quality Insights
Northwest St. Louis, Minnesota, United States
AQI levels in 2025
Jan.
Feb.
Mar.
Apr.
May
Jun.
Jul.
Aug.
Sep.
Oct.
Nov.
Dec.
19AQI
18AQI
15AQI
15AQI
17AQI
16AQI
17AQI
16AQI
29AQI
18AQI
23AQI
14AQI
20AQI
23AQI
39AQI
42AQI
51AQI
50AQI
18AQI
13AQI
18AQI
26AQI
20AQI
16AQI
18AQI
18AQI
21AQI
19AQI
18AQI
16AQI
21AQI
21AQI
19AQI
13AQI
23AQI
19AQI
14AQI
18AQI
25AQI
21AQI
24AQI
16AQI
15AQI
37AQI
22AQI
28AQI
33AQI
38AQI
36AQI
37AQI
14AQI
13AQI
13AQI
12AQI
14AQI
15AQI
16AQI
13AQI
18AQI
30AQI
33AQI
30AQI
20AQI
34AQI
48AQI
48AQI
59AQI
73AQI
115AQI
62AQI
53AQI
49AQI
52AQI
54AQI
51AQI
63AQI
79AQI
60AQI
39AQI
28AQI
30AQI
35AQI
30AQI
42AQI
30AQI
28AQI
22AQI
24AQI
31AQI
43AQI
38AQI
27AQI
24AQI
24AQI
22AQI
21AQI
40AQI
47AQI
52AQI
48AQI
28AQI
57AQI
49AQI
37AQI
38AQI
30AQI
37AQI
162AQI
146AQI
133AQI
80AQI
40AQI
36AQI
39AQI
33AQI
72AQI
61AQI
66AQI
37AQI
57AQI
90AQI
73AQI
37AQI
39AQI
70AQI
127AQI
164AQI
163AQI
146AQI
97AQI
79AQI
82AQI
63AQI
53AQI
47AQI
37AQI
34AQI
99AQI
77AQI
65AQI
59AQI
48AQI
25AQI
16AQI
18AQI
23AQI
20AQI
26AQI
33AQI
19AQI
17AQI
18AQI
26AQI
30AQI
30AQI
29AQI
36AQI
45AQI
46AQI
39AQI
41AQI
22AQI
19AQI
20AQI
27AQI
39AQI
48AQI
44AQI
35AQI
45AQI
49AQI
49AQI
49AQI
48AQI
46AQI
27AQI
20AQI
21AQI
22AQI
24AQI
29AQI
32AQI
36AQI
23AQI
22AQI
23AQI
42AQI
27AQI
34AQI
46AQI
57AQI
62AQI
62AQI
13AQI
15AQI
19AQI
38AQI
26AQI
22AQI
28AQI
20AQI
20AQI
24AQI
35AQI
17AQI
23AQI
24AQI
44AQI
65AQI
50AQI
34AQI
33AQI
No. of days
202539AQI
Highest AQI recorded in
July65AQI
Lowest AQI recorded in
March17AQI
Most & Least Polluted Years Over the Last 1 Years
Northwest St. Louis's annual 2025 AQI (39) shows an average percentage change of NaN% (improved AQI) compared to previous years: .