Evanston, Wyoming, 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
Evanston, Wyoming, United States
AQI Trends: Highest and Lowest
Same Day Analysis (4th October ):
On this day, AQI across the 2 years varied significantly: 2025 ranks 2nd highest AQI at 24 of Good air quality, showing improvement over 2024 on the same day.
Download 2024 Annual Data
World Air Quality Report

Day & Night AQI Trend: 4th Oct - 5th Oct 2025
Evanston, Wyoming, United States
7 AM4th Oct 2025
7 PM
6 AM5th Oct 2025
22AQI
11AQI
30AQI
11AQI
In the last 24 hours,
Evanston's AQI reached its highest point of 30 at 10 PM during the Night, while the lowest point, undefined, was recorded at 6 AM during the Night between 4th Oct and 5th Oct 2025.
Day & Night AQI Trend : Sep - Oct 2025
Evanston, Wyoming, United States
15°C9/25°C
15°C8/23°C
15°C7/25°C
16°C6/25°C
16°C8/25°C
16°C5/26°C
15°C5/24°C
12°C7/21°C
9°C3/19°C
12°C2/22°C
13°C4/22°C
12°C5/19°C
12°C4/20°C
13°C4/23°C
14°C5/22°C
13°C8/20°C
14°C5/22°C
11°C7/16°C
9°C1/17°C
12°C1/23°C
14°C5/25°C
14°C7/21°C
14°C6/24°C
13°C9/20°C
13°C5/20°C
11°C6/17°C
11°C3/19°C
13°C3/23°C
13°C4/22°C
6°C3/8°C
--°C/°C
29AQI
24AQI
26AQI
23AQI
2025 Days Vs Air Quality
Evanston, Wyoming, United States
97%
270
3%
7
Total number of days with different AQI categories in last 278 days in 2025 (87 days remaining)
Under WHO’s Safe Air Quality Limits: 97%
Health Risk Level:
Very Low
In 2025, 97% of 278 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
Evanston, Wyoming, United States
AQI levels in 2025
Jan.
Feb.
Mar.
Apr.
May
Jun.
Jul.
Aug.
Sep.
Oct.
Nov.
Dec.
26AQI
26AQI
29AQI
27AQI
24AQI
26AQI
28AQI
28AQI
27AQI
28AQI
26AQI
26AQI
24AQI
25AQI
37AQI
38AQI
38AQI
29AQI
26AQI
28AQI
31AQI
34AQI
30AQI
30AQI
30AQI
30AQI
30AQI
39AQI
46AQI
52AQI
41AQI
33AQI
28AQI
33AQI
33AQI
31AQI
26AQI
29AQI
28AQI
28AQI
27AQI
28AQI
30AQI
21AQI
21AQI
22AQI
19AQI
20AQI
19AQI
20AQI
19AQI
19AQI
20AQI
22AQI
24AQI
21AQI
19AQI
19AQI
22AQI
24AQI
22AQI
26AQI
20AQI
19AQI
19AQI
19AQI
19AQI
21AQI
20AQI
20AQI
23AQI
20AQI
17AQI
19AQI
20AQI
34AQI
18AQI
24AQI
22AQI
22AQI
22AQI
21AQI
21AQI
20AQI
21AQI
19AQI
50AQI
53AQI
37AQI
25AQI
20AQI
16AQI
16AQI
17AQI
15AQI
15AQI
18AQI
21AQI
36AQI
36AQI
33AQI
23AQI
21AQI
22AQI
21AQI
20AQI
18AQI
15AQI
13AQI
15AQI
17AQI
21AQI
21AQI
19AQI
17AQI
17AQI
16AQI
14AQI
17AQI
17AQI
16AQI
19AQI
21AQI
18AQI
18AQI
14AQI
14AQI
18AQI
17AQI
19AQI
22AQI
25AQI
29AQI
18AQI
15AQI
16AQI
15AQI
16AQI
18AQI
18AQI
19AQI
20AQI
25AQI
21AQI
17AQI
16AQI
21AQI
22AQI
17AQI
24AQI
27AQI
26AQI
24AQI
18AQI
18AQI
22AQI
23AQI
26AQI
23AQI
26AQI
23AQI
21AQI
22AQI
29AQI
29AQI
23AQI
23AQI
21AQI
24AQI
25AQI
35AQI
52AQI
42AQI
21AQI
24AQI
28AQI
24AQI
39AQI
38AQI
27AQI
22AQI
28AQI
25AQI
27AQI
25AQI
31AQI
31AQI
29AQI
27AQI
29AQI
29AQI
40AQI
34AQI
31AQI
31AQI
32AQI
39AQI
37AQI
40AQI
31AQI
29AQI
24AQI
22AQI
23AQI
32AQI
32AQI
32AQI
30AQI
29AQI
41AQI
39AQI
42AQI
31AQI
22AQI
21AQI
39AQI
53AQI
48AQI
36AQI
30AQI
19AQI
19AQI
28AQI
28AQI
36AQI
45AQI
34AQI
30AQI
19AQI
22AQI
19AQI
21AQI
24AQI
27AQI
34AQI
38AQI
46AQI
52AQI
31AQI
25AQI
48AQI
42AQI
31AQI
38AQI
36AQI
40AQI
43AQI
58AQI
66AQI
43AQI
46AQI
29AQI
19AQI
14AQI
15AQI
12AQI
17AQI
22AQI
20AQI
16AQI
17AQI
21AQI
19AQI
16AQI
14AQI
13AQI
15AQI
34AQI
27AQI
24AQI
16AQI
18AQI
14AQI
32AQI
39AQI
36AQI
24AQI
31AQI
24AQI
24AQI
20AQI
19AQI
27AQI
31AQI
32AQI
26AQI
33AQI
No. of days
202526AQI
Highest AQI recorded in
October33AQI
Lowest AQI recorded in
May19AQI
202432AQI
Highest AQI recorded in
July45AQI
Lowest AQI recorded in
February0AQI
202326AQI
Highest AQI recorded in
November43AQI
Lowest AQI recorded in
December24AQI
202034AQI
Highest AQI recorded in
August41AQI
Lowest AQI recorded in
June31AQI
Most & Least Polluted Years Over the Last 4 Years
Evanston's annual 2025 AQI (26) shows an average percentage change of -13.8% (improved AQI) compared to previous years: 2020 (34), 2023 (26), 2024 (32).