U.S. 31, Decatur, Alabama, 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
U.S. 31, Decatur, Alabama, United States
AQI Trends: Highest and Lowest
Same Day Analysis (3rd October ):
On this day, AQI across the 1 years varied significantly: 2025 ranks 1st highest AQI at 48 of Good air quality on the same day.
Download 2024 Annual Data
World Air Quality Report

Day & Night AQI Trend: 4th Oct - 5th Oct 2025
U.S. 31, Decatur, Alabama, United States
6 AM4th Oct 2025
6 PM
5 AM5th Oct 2025
57AQI
39AQI
48AQI
21AQI
In the last 24 hours,
U.S. 31's AQI reached its highest point of 57 at 4 PM during the Day, while the lowest point, 21, was recorded at 7 PM during the Night between 4th Oct and 5th Oct 2025.
Day & Night AQI Trend : Sep - Oct 2025
U.S. 31, Decatur, Alabama, United States
27°C19/34°C
21°C16/23°C
20°C13/27°C
18°C12/23°C
22°C15/30°C
22°C11/32°C
23°C14/32°C
24°C14/34°C
23°C14/33°C
24°C15/33°C
25°C17/34°C
25°C16/34°C
25°C18/35°C
25°C14/34°C
25°C16/35°C
26°C20/33°C
26°C19/34°C
25°C21/33°C
24°C21/32°C
24°C21/28°C
24°C22/30°C
23°C20/28°C
23°C16/31°C
24°C16/33°C
24°C17/32°C
23°C16/32°C
24°C17/32°C
23°C15/31°C
21°C14/29°C
21°C13/30°C
--°C/°C
47AQI
43AQI
44AQI
44AQI
2025 Days Vs Air Quality
U.S. 31, Decatur, Alabama, United States
84%
160
16%
31
Total number of days with different AQI categories in last 278 days in 2025 (87 days remaining)
Under WHO’s Safe Air Quality Limits: 84%
Health Risk Level:
Low
In 2025, 84% of 278 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
U.S. 31, Decatur, Alabama, United States
AQI levels in 2025
Jan.
Feb.
Mar.
Apr.
May
Jun.
Jul.
Aug.
Sep.
Oct.
Nov.
Dec.
44AQI
64AQI
60AQI
51AQI
25AQI
23AQI
35AQI
37AQI
39AQI
34AQI
19AQI
16AQI
23AQI
24AQI
38AQI
29AQI
30AQI
30AQI
45AQI
33AQI
28AQI
50AQI
54AQI
53AQI
50AQI
47AQI
25AQI
32AQI
35AQI
42AQI
27AQI
32AQI
40AQI
50AQI
51AQI
39AQI
31AQI
22AQI
19AQI
22AQI
31AQI
38AQI
39AQI
29AQI
28AQI
20AQI
21AQI
25AQI
37AQI
43AQI
47AQI
39AQI
36AQI
37AQI
42AQI
26AQI
24AQI
24AQI
30AQI
29AQI
24AQI
19AQI
24AQI
25AQI
25AQI
38AQI
50AQI
50AQI
61AQI
64AQI
45AQI
48AQI
48AQI
31AQI
38AQI
34AQI
56AQI
55AQI
39AQI
31AQI
30AQI
32AQI
26AQI
32AQI
25AQI
31AQI
41AQI
44AQI
44AQI
54AQI
59AQI
49AQI
44AQI
36AQI
35AQI
34AQI
29AQI
34AQI
45AQI
54AQI
68AQI
58AQI
55AQI
51AQI
39AQI
31AQI
35AQI
42AQI
44AQI
28AQI
33AQI
39AQI
37AQI
24AQI
31AQI
39AQI
40AQI
46AQI
39AQI
47AQI
36AQI
26AQI
22AQI
33AQI
36AQI
48AQI
45AQI
43AQI
47AQI
32AQI
32AQI
26AQI
24AQI
29AQI
33AQI
43AQI
46AQI
26AQI
22AQI
21AQI
30AQI
48AQI
52AQI
53AQI
47AQI
49AQI
46AQI
34AQI
36AQI
36AQI
27AQI
26AQI
23AQI
28AQI
32AQI
31AQI
35AQI
33AQI
39AQI
42AQI
42AQI
39AQI
57AQI
40AQI
33AQI
28AQI
35AQI
45AQI
54AQI
54AQI
46AQI
49AQI
52AQI
54AQI
56AQI
55AQI
58AQI
58AQI
58AQI
56AQI
54AQI
46AQI
26AQI
22AQI
21AQI
26AQI
29AQI
34AQI
44AQI
43AQI
48AQI
49AQI
36AQI
30AQI
42AQI
40AQI
35AQI
44AQI
45AQI
No. of days
202538AQI
Highest AQI recorded in
March49AQI
Lowest AQI recorded in
May30AQI
Most & Least Polluted Years Over the Last 1 Years
U.S. 31's annual 2025 AQI (38) shows an average percentage change of NaN% (improved AQI) compared to previous years: .