Union, Kentucky, United States Historical Air Quality Analysis
Dive into detailed Air Quality Insights with historical data, monthly patterns, and yearly trends at your fingertips!
September Air Quality Analysis
Union, Kentucky, United States
AQI Trends: Highest and Lowest
Same Day Analysis (29th September ):
On this day, AQI across the 1 years varied significantly: 2025 ranks 1st highest AQI at 34 of Good air quality on the same day.
Download 2024 Annual Data
World Air Quality Report

Day & Night AQI Trend: 29th Sep - 30th Sep 2025
Union, Kentucky, United States
7 AM29th Sep 2025
7 PM
6 AM30th Sep 2025
75AQI
37AQI
61AQI
43AQI
In the last 24 hours,
Union's AQI reached its highest point of 75 at 11 AM during the Day, while the lowest point, 37, was recorded at 5 PM during the Day between 29th Sep and 30th Sep 2025.
Day & Night AQI Trend : Aug - Sep 2025
Union, Kentucky, United States
20°C12/28°C
21°C13/29°C
23°C14/31°C
21°C14/29°C
20°C17/25°C
20°C11/30°C
19°C15/25°C
16°C11/21°C
17°C8/25°C
19°C11/27°C
21°C14/30°C
22°C13/31°C
23°C15/31°C
23°C14/32°C
25°C19/33°C
25°C17/33°C
24°C17/32°C
25°C17/32°C
25°C15/33°C
25°C16/33°C
25°C19/33°C
25°C18/33°C
22°C19/30°C
22°C19/28°C
21°C19/23°C
21°C18/24°C
20°C14/28°C
21°C14/31°C
23°C14/33°C
23°C15/33°C
--°C/°C
41AQI
38AQI
40AQI
40AQI
2025 Days Vs Air Quality
Union, Kentucky, United States
86%
160
14%
27
Total number of days with different AQI categories in last 273 days in 2025 (92 days remaining)
Under WHO’s Safe Air Quality Limits: 86%
Health Risk Level:
Low
In 2025, 86% of 273 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
Union, Kentucky, United States
AQI levels in 2025
Jan.
Feb.
Mar.
Apr.
May
Jun.
Jul.
Aug.
Sep.
Oct.
Nov.
Dec.
33AQI
39AQI
54AQI
37AQI
18AQI
21AQI
25AQI
23AQI
18AQI
15AQI
17AQI
25AQI
16AQI
22AQI
28AQI
40AQI
44AQI
36AQI
42AQI
21AQI
23AQI
28AQI
44AQI
41AQI
36AQI
37AQI
21AQI
30AQI
35AQI
26AQI
27AQI
20AQI
24AQI
42AQI
25AQI
32AQI
29AQI
19AQI
17AQI
15AQI
20AQI
27AQI
29AQI
26AQI
28AQI
37AQI
24AQI
17AQI
23AQI
39AQI
48AQI
25AQI
19AQI
24AQI
26AQI
22AQI
14AQI
15AQI
15AQI
19AQI
18AQI
16AQI
17AQI
30AQI
31AQI
42AQI
29AQI
44AQI
49AQI
70AQI
59AQI
42AQI
38AQI
39AQI
53AQI
50AQI
57AQI
63AQI
63AQI
29AQI
27AQI
33AQI
30AQI
29AQI
23AQI
35AQI
42AQI
45AQI
56AQI
56AQI
55AQI
49AQI
38AQI
35AQI
35AQI
31AQI
28AQI
35AQI
47AQI
56AQI
89AQI
62AQI
52AQI
44AQI
53AQI
40AQI
42AQI
44AQI
41AQI
40AQI
43AQI
29AQI
26AQI
24AQI
25AQI
31AQI
32AQI
58AQI
58AQI
54AQI
50AQI
34AQI
21AQI
22AQI
24AQI
30AQI
36AQI
67AQI
48AQI
39AQI
35AQI
36AQI
31AQI
30AQI
31AQI
39AQI
44AQI
50AQI
42AQI
30AQI
51AQI
56AQI
56AQI
45AQI
37AQI
41AQI
29AQI
23AQI
29AQI
41AQI
35AQI
20AQI
20AQI
25AQI
31AQI
29AQI
25AQI
28AQI
28AQI
27AQI
34AQI
36AQI
52AQI
29AQI
32AQI
23AQI
27AQI
34AQI
45AQI
41AQI
48AQI
50AQI
48AQI
46AQI
52AQI
55AQI
58AQI
54AQI
47AQI
39AQI
33AQI
35AQI
32AQI
35AQI
38AQI
39AQI
34AQI
36AQI
28AQI
25AQI
43AQI
41AQI
37AQI
40AQI
No. of days
202536AQI
Highest AQI recorded in
June43AQI
Lowest AQI recorded in
May25AQI
Most & Least Polluted Years Over the Last 1 Years
Union's annual 2025 AQI (36) shows an average percentage change of NaN% (improved AQI) compared to previous years: .