Libby, Montana, 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
Libby, Montana, United States
AQI Trends: Highest and Lowest
Same Day Analysis (28th September ):
On this day, AQI across the 1 years varied significantly: 2025 ranks 1st highest AQI at 103 of Poor air quality on the same day.
Download 2024 Annual Data
World Air Quality Report

Day & Night AQI Trend: 28th Sep - 29th Sep 2025
Libby, Montana, United States
7 AM28th Sep 2025
7 PM
6 AM29th Sep 2025
147AQI
84AQI
86AQI
71AQI
In the last 24 hours,
Libby's AQI reached its highest point of 147 at 1 PM during the Day, while the lowest point, 71, was recorded at 6 AM during the Night between 28th Sep and 29th Sep 2025.
Day & Night AQI Trend : Aug - Sep 2025
Libby, Montana, United States
21°C15/27°C
23°C17/30°C
24°C17/29°C
25°C18/32°C
25°C18/32°C
21°C17/24°C
18°C12/25°C
21°C15/27°C
22°C17/26°C
20°C16/24°C
19°C14/25°C
20°C14/25°C
19°C14/25°C
18°C14/21°C
18°C13/23°C
17°C14/21°C
13°C12/16°C
16°C11/22°C
19°C13/24°C
19°C13/25°C
21°C14/26°C
20°C15/24°C
17°C10/22°C
13°C7/21°C
15°C6/26°C
18°C6/29°C
19°C8/28°C
16°C11/20°C
16°C7/25°C
18°C8/28°C
--°C/°C
59AQI
56AQI
59AQI
57AQI
2025 Days Vs Air Quality
Libby, Montana, United States
88%
164
11%
21
1%
2
Total number of days with different AQI categories in last 272 days in 2025 (93 days remaining)
Under WHO’s Safe Air Quality Limits: 88%
Health Risk Level:
Low
In 2025, 88% of 272 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
Libby, Montana, United States
AQI levels in 2025
Jan.
Feb.
Mar.
Apr.
May
Jun.
Jul.
Aug.
Sep.
Oct.
Nov.
Dec.
25AQI
34AQI
27AQI
27AQI
39AQI
39AQI
20AQI
28AQI
31AQI
36AQI
32AQI
39AQI
41AQI
20AQI
18AQI
33AQI
27AQI
27AQI
22AQI
33AQI
36AQI
40AQI
20AQI
29AQI
40AQI
16AQI
19AQI
20AQI
23AQI
34AQI
35AQI
32AQI
45AQI
32AQI
27AQI
25AQI
25AQI
28AQI
34AQI
19AQI
22AQI
21AQI
24AQI
23AQI
30AQI
32AQI
22AQI
16AQI
22AQI
20AQI
16AQI
23AQI
15AQI
15AQI
16AQI
15AQI
19AQI
19AQI
18AQI
22AQI
22AQI
24AQI
25AQI
23AQI
27AQI
24AQI
28AQI
20AQI
20AQI
18AQI
21AQI
29AQI
33AQI
32AQI
36AQI
38AQI
36AQI
44AQI
41AQI
34AQI
27AQI
27AQI
26AQI
34AQI
37AQI
27AQI
33AQI
27AQI
27AQI
29AQI
41AQI
41AQI
37AQI
32AQI
30AQI
30AQI
28AQI
29AQI
33AQI
34AQI
31AQI
32AQI
26AQI
24AQI
28AQI
26AQI
31AQI
24AQI
28AQI
28AQI
30AQI
25AQI
38AQI
40AQI
39AQI
39AQI
40AQI
32AQI
24AQI
27AQI
32AQI
26AQI
21AQI
23AQI
24AQI
26AQI
33AQI
32AQI
35AQI
35AQI
24AQI
25AQI
28AQI
35AQI
30AQI
22AQI
24AQI
29AQI
30AQI
28AQI
39AQI
52AQI
43AQI
25AQI
19AQI
22AQI
27AQI
28AQI
27AQI
30AQI
36AQI
21AQI
33AQI
45AQI
57AQI
57AQI
57AQI
56AQI
60AQI
60AQI
62AQI
68AQI
75AQI
76AQI
103AQI
94AQI
72AQI
55AQI
40AQI
44AQI
55AQI
58AQI
57AQI
43AQI
35AQI
51AQI
47AQI
49AQI
51AQI
52AQI
30AQI
37AQI
36AQI
41AQI
48AQI
69AQI
103AQI
32AQI
29AQI
22AQI
31AQI
30AQI
35AQI
58AQI
No. of days
202534AQI
Highest AQI recorded in
September58AQI
Lowest AQI recorded in
May22AQI
Most & Least Polluted Years Over the Last 1 Years
Libby's annual 2025 AQI (34) shows an average percentage change of NaN% (improved AQI) compared to previous years: .