Mill City, Oregon, 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
Mill City, Oregon, United States
AQI Trends: Highest and Lowest
Same Day Analysis (27th September ):
On this day, AQI across the 1 years varied significantly: 2025 ranks 1st highest AQI at 17 of Good air quality on the same day.
Download 2024 Annual Data
World Air Quality Report

Day & Night AQI Trend: 27th Sep - 28th Sep 2025
Mill City, Oregon, United States
6 AM27th Sep 2025
7 PM
5 AM28th Sep 2025
19AQI
13AQI
19AQI
16AQI
In the last 24 hours,
Mill City's AQI reached its highest point of 19 at 3 PM during the Day, while the lowest point, 13, was recorded at 9 AM during the Day between 27th Sep and 28th Sep 2025.
Day & Night AQI Trend : Aug - Sep 2025
Mill City, Oregon, United States
--°C/°C
18°C11/27°C
18°C12/26°C
15°C10/22°C
22°C12/31°C
23°C18/30°C
24°C14/31°C
22°C18/28°C
16°C12/20°C
15°C11/21°C
16°C11/22°C
14°C10/19°C
15°C11/21°C
14°C10/19°C
17°C11/23°C
17°C12/25°C
15°C13/17°C
16°C9/25°C
21°C12/32°C
19°C12/25°C
18°C15/23°C
21°C16/27°C
19°C10/25°C
13°C7/16°C
16°C8/26°C
23°C17/31°C
23°C16/31°C
18°C11/24°C
16°C8/25°C
19°C12/26°C
18°C12/24°C
36AQI
36AQI
36AQI
36AQI
2025 Days Vs Air Quality
Mill City, Oregon, United States
97%
181
3%
5
Total number of days with different AQI categories in last 272 days in 2025 (93 days remaining)
Under WHO’s Safe Air Quality Limits: 97%
Health Risk Level:
Very Low
In 2025, 97% of 272 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
Mill City, Oregon, United States
AQI levels in 2025
Jan.
Feb.
Mar.
Apr.
May
Jun.
Jul.
Aug.
Sep.
Oct.
Nov.
Dec.
18AQI
16AQI
16AQI
17AQI
30AQI
17AQI
22AQI
19AQI
19AQI
28AQI
25AQI
27AQI
17AQI
16AQI
17AQI
22AQI
19AQI
19AQI
32AQI
30AQI
32AQI
29AQI
33AQI
28AQI
32AQI
27AQI
15AQI
23AQI
28AQI
30AQI
27AQI
27AQI
21AQI
15AQI
21AQI
22AQI
29AQI
24AQI
15AQI
17AQI
22AQI
21AQI
25AQI
18AQI
22AQI
22AQI
16AQI
16AQI
16AQI
17AQI
20AQI
21AQI
15AQI
15AQI
19AQI
14AQI
17AQI
20AQI
20AQI
22AQI
19AQI
17AQI
19AQI
20AQI
17AQI
20AQI
25AQI
17AQI
21AQI
22AQI
22AQI
21AQI
25AQI
20AQI
26AQI
29AQI
29AQI
30AQI
30AQI
22AQI
20AQI
24AQI
25AQI
20AQI
17AQI
18AQI
16AQI
15AQI
14AQI
23AQI
44AQI
32AQI
21AQI
14AQI
15AQI
17AQI
20AQI
22AQI
17AQI
16AQI
18AQI
31AQI
21AQI
20AQI
22AQI
17AQI
15AQI
18AQI
22AQI
25AQI
19AQI
20AQI
26AQI
27AQI
25AQI
21AQI
21AQI
22AQI
24AQI
24AQI
23AQI
21AQI
16AQI
18AQI
18AQI
19AQI
22AQI
29AQI
46AQI
22AQI
22AQI
27AQI
34AQI
21AQI
17AQI
18AQI
20AQI
26AQI
29AQI
28AQI
36AQI
18AQI
16AQI
14AQI
16AQI
17AQI
20AQI
21AQI
17AQI
24AQI
39AQI
47AQI
52AQI
48AQI
48AQI
38AQI
42AQI
48AQI
40AQI
31AQI
40AQI
54AQI
65AQI
60AQI
43AQI
38AQI
40AQI
32AQI
33AQI
42AQI
31AQI
36AQI
20AQI
19AQI
21AQI
25AQI
26AQI
40AQI
39AQI
26AQI
20AQI
33AQI
52AQI
46AQI
24AQI
17AQI
19AQI
24AQI
19AQI
22AQI
21AQI
29AQI
35AQI
No. of days
202525AQI
Highest AQI recorded in
September35AQI
Lowest AQI recorded in
March19AQI
Most & Least Polluted Years Over the Last 1 Years
Mill City's annual 2025 AQI (25) shows an average percentage change of NaN% (improved AQI) compared to previous years: .