Miles City, Montana, United States Historical Air Quality Analysis
Dive into detailed Air Quality Insights with historical data, monthly patterns, and yearly trends at your fingertips!
August Air Quality Analysis
Miles City, Montana, United States
AQI Trends: Highest and Lowest
Same Day Analysis (12th August ):
On this day, AQI across the 5 years varied significantly: 2025 ranks 4th highest AQI at 25 of Good air quality, showing improvement over 2024, 2023 and 2021 on the same day.
Download 2024 Annual Data
World Air Quality Report

Day & Night AQI Trend: 12th Aug - 13th Aug 2025
Miles City, Montana, United States
5 AM12th Aug 2025
8 PM
4 AM13th Aug 2025
34AQI
21AQI
35AQI
25AQI
In the last 24 hours,
Miles City's AQI reached its highest point of 35 at 1 AM during the Night, while the lowest point, 21, was recorded at 6 PM during the Day between 12th Aug and 13th Aug 2025.
Day & Night AQI Trend : Jul - Aug 2025
Miles City, Montana, United States
29°C17/38°C
17°C15/17°C
16°C12/22°C
18°C11/25°C
22°C14/29°C
26°C17/34°C
24°C16/31°C
23°C15/32°C
21°C17/26°C
21°C18/26°C
24°C14/32°C
28°C17/36°C
28°C19/36°C
25°C16/33°C
23°C19/30°C
23°C17/29°C
21°C18/27°C
23°C17/29°C
25°C18/33°C
25°C17/34°C
25°C17/32°C
27°C15/35°C
24°C17/30°C
26°C17/34°C
26°C19/33°C
19°C15/23°C
20°C15/25°C
22°C11/30°C
23°C15/32°C
22°C13/31°C
--°C/°C
34AQI
34AQI
37AQI
33AQI
2025 Days Vs Air Quality
Miles City, Montana, United States
96%
214
4%
10
Total number of days with different AQI categories in last 225 days in 2025 (140 days remaining)
Under WHO’s Safe Air Quality Limits: 96%
Health Risk Level:
Very Low
In 2025, 96% of 225 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
Miles City, Montana, United States
AQI levels in 2025
Jan.
Feb.
Mar.
Apr.
May
Jun.
Jul.
Aug.
Sep.
Oct.
Nov.
Dec.
36AQI
31AQI
27AQI
27AQI
28AQI
28AQI
36AQI
27AQI
26AQI
24AQI
23AQI
24AQI
28AQI
25AQI
27AQI
28AQI
25AQI
29AQI
40AQI
50AQI
44AQI
26AQI
26AQI
26AQI
26AQI
26AQI
27AQI
27AQI
27AQI
28AQI
28AQI
28AQI
28AQI
27AQI
29AQI
26AQI
36AQI
26AQI
31AQI
31AQI
32AQI
32AQI
33AQI
38AQI
38AQI
31AQI
28AQI
28AQI
27AQI
45AQI
42AQI
30AQI
26AQI
29AQI
37AQI
23AQI
24AQI
22AQI
22AQI
23AQI
23AQI
33AQI
25AQI
20AQI
21AQI
23AQI
24AQI
23AQI
24AQI
22AQI
26AQI
24AQI
28AQI
16AQI
15AQI
17AQI
21AQI
23AQI
16AQI
16AQI
15AQI
18AQI
16AQI
22AQI
19AQI
19AQI
30AQI
22AQI
20AQI
22AQI
23AQI
23AQI
26AQI
25AQI
19AQI
22AQI
24AQI
23AQI
21AQI
25AQI
32AQI
29AQI
20AQI
20AQI
21AQI
25AQI
18AQI
16AQI
18AQI
17AQI
15AQI
13AQI
16AQI
21AQI
22AQI
18AQI
23AQI
22AQI
18AQI
19AQI
18AQI
21AQI
23AQI
24AQI
27AQI
21AQI
23AQI
23AQI
30AQI
31AQI
27AQI
24AQI
29AQI
25AQI
20AQI
22AQI
19AQI
17AQI
16AQI
12AQI
15AQI
18AQI
16AQI
21AQI
22AQI
19AQI
21AQI
19AQI
19AQI
22AQI
59AQI
48AQI
29AQI
42AQI
29AQI
26AQI
24AQI
36AQI
56AQI
54AQI
54AQI
81AQI
81AQI
51AQI
28AQI
28AQI
30AQI
28AQI
27AQI
29AQI
28AQI
32AQI
27AQI
19AQI
30AQI
29AQI
23AQI
24AQI
23AQI
20AQI
19AQI
22AQI
27AQI
27AQI
30AQI
33AQI
27AQI
25AQI
24AQI
28AQI
22AQI
38AQI
48AQI
37AQI
32AQI
35AQI
33AQI
38AQI
38AQI
35AQI
29AQI
26AQI
35AQI
32AQI
35AQI
36AQI
29AQI
25AQI
26AQI
31AQI
54AQI
49AQI
51AQI
41AQI
33AQI
37AQI
31AQI
30AQI
31AQI
19AQI
20AQI
63AQI
43AQI
25AQI
29AQI
30AQI
21AQI
21AQI
23AQI
35AQI
32AQI
35AQI
No. of days
202528AQI
Highest AQI recorded in
August35AQI
Lowest AQI recorded in
April21AQI
202434AQI
Highest AQI recorded in
July73AQI
Lowest AQI recorded in
March19AQI
202345AQI
Highest AQI recorded in
July70AQI
Lowest AQI recorded in
January31AQI
202237AQI
Highest AQI recorded in
July52AQI
Lowest AQI recorded in
January29AQI
202145AQI
Highest AQI recorded in
August74AQI
Lowest AQI recorded in
December31AQI
202044AQI
Highest AQI recorded in
September62AQI
Lowest AQI recorded in
March31AQI
Most & Least Polluted Years Over the Last 6 Years
Miles City's annual 2025 AQI (28) shows an average percentage change of -30.8% (improved AQI) compared to previous years: 2020 (44), 2021 (45), 2022 (37), 2023 (45), 2024 (34).