Illinois 1, West Union, Illinois, 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
Illinois 1, West Union, Illinois, United States
AQI Trends: Highest and Lowest
Same Day Analysis (18th October ):
On this day, AQI across the 1 years varied significantly: 2025 ranks 1st highest AQI at 46 of Good air quality on the same day.
Download 2024 Annual Data
World Air Quality Report

Day & Night AQI Trend: 18th Oct - 19th Oct 2025
Illinois 1, West Union, Illinois, United States
6 AM18th Oct 2025
6 PM
5 AM19th Oct 2025
76AQI
26AQI
50AQI
14AQI
In the last 24 hours,
Illinois 1's AQI reached its highest point of 76 at 4 PM during the Day, while the lowest point, 14, was recorded at 1 AM during the Night between 18th Oct and 19th Oct 2025.
Day & Night AQI Trend : Sep - Oct 2025
Illinois 1, West Union, Illinois, United States
23°C14/29°C
24°C19/30°C
23°C18/30°C
20°C19/23°C
22°C18/28°C
21°C19/26°C
20°C16/24°C
19°C10/27°C
19°C11/29°C
22°C13/31°C
22°C14/32°C
22°C15/30°C
21°C13/30°C
21°C13/30°C
23°C15/31°C
22°C16/30°C
20°C13/29°C
21°C16/26°C
21°C16/27°C
16°C9/23°C
14°C6/22°C
13°C4/23°C
16°C9/25°C
16°C7/25°C
16°C8/25°C
19°C10/28°C
19°C11/27°C
17°C13/23°C
17°C10/26°C
20°C15/30°C
--°C/°C
58AQI
38AQI
52AQI
39AQI
2025 Days Vs Air Quality
Illinois 1, West Union, Illinois, United States
75%
155
25%
51
Total number of days with different AQI categories in last 292 days in 2025 (73 days remaining)
Under WHO’s Safe Air Quality Limits: 75%
Health Risk Level:
Low
In 2025, 75% of 292 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
Illinois 1, West Union, Illinois, United States
AQI levels in 2025
Jan.
Feb.
Mar.
Apr.
May
Jun.
Jul.
Aug.
Sep.
Oct.
Nov.
Dec.
43AQI
41AQI
49AQI
38AQI
23AQI
30AQI
32AQI
27AQI
26AQI
20AQI
21AQI
28AQI
20AQI
31AQI
33AQI
33AQI
43AQI
38AQI
38AQI
24AQI
30AQI
36AQI
50AQI
38AQI
42AQI
29AQI
37AQI
42AQI
45AQI
33AQI
30AQI
27AQI
30AQI
37AQI
27AQI
33AQI
27AQI
26AQI
21AQI
21AQI
25AQI
31AQI
32AQI
28AQI
36AQI
37AQI
32AQI
26AQI
32AQI
44AQI
49AQI
30AQI
28AQI
29AQI
29AQI
19AQI
16AQI
23AQI
26AQI
26AQI
24AQI
23AQI
27AQI
27AQI
30AQI
45AQI
31AQI
45AQI
54AQI
59AQI
48AQI
52AQI
57AQI
53AQI
53AQI
55AQI
61AQI
69AQI
64AQI
44AQI
38AQI
39AQI
37AQI
37AQI
28AQI
37AQI
42AQI
46AQI
54AQI
54AQI
53AQI
53AQI
46AQI
37AQI
35AQI
31AQI
26AQI
34AQI
46AQI
53AQI
68AQI
62AQI
49AQI
55AQI
53AQI
43AQI
44AQI
45AQI
38AQI
33AQI
37AQI
35AQI
30AQI
26AQI
35AQI
36AQI
31AQI
47AQI
55AQI
54AQI
50AQI
47AQI
31AQI
30AQI
33AQI
38AQI
44AQI
88AQI
72AQI
45AQI
36AQI
39AQI
44AQI
45AQI
48AQI
48AQI
45AQI
52AQI
44AQI
39AQI
57AQI
59AQI
56AQI
49AQI
47AQI
41AQI
22AQI
19AQI
28AQI
37AQI
25AQI
23AQI
25AQI
35AQI
35AQI
36AQI
31AQI
29AQI
28AQI
29AQI
35AQI
51AQI
54AQI
31AQI
31AQI
25AQI
37AQI
47AQI
56AQI
54AQI
57AQI
56AQI
55AQI
54AQI
52AQI
52AQI
52AQI
54AQI
49AQI
42AQI
35AQI
29AQI
29AQI
32AQI
42AQI
54AQI
34AQI
34AQI
52AQI
54AQI
58AQI
61AQI
63AQI
46AQI
32AQI
42AQI
44AQI
49AQI
62AQI
55AQI
57AQI
55AQI
60AQI
53AQI
44AQI
46AQI
39AQI
33AQI
29AQI
47AQI
42AQI
42AQI
43AQI
52AQI
No. of days
202540AQI
Highest AQI recorded in
October52AQI
Lowest AQI recorded in
May29AQI
Most & Least Polluted Years Over the Last 1 Years
Illinois 1's annual 2025 AQI (40) shows an average percentage change of NaN% (improved AQI) compared to previous years: .