Custer, Washington, 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
Custer, Washington, United States
AQI Trends: Highest and Lowest
Same Day Analysis (23rd September ):
On this day, AQI across the 1 years varied significantly: 2025 ranks 1st highest AQI at 32 of Good air quality on the same day.
Download 2024 Annual Data
World Air Quality Report

Day & Night AQI Trend: 23rd Sep - 24th Sep 2025
Custer, Washington, United States
6 AM23rd Sep 2025
7 PM
5 AM24th Sep 2025
33AQI
24AQI
44AQI
31AQI
In the last 24 hours,
Custer's AQI reached its highest point of 44 at 2 AM during the Night, while the lowest point, 24, was recorded at 10 AM during the Day between 23rd Sep and 24th Sep 2025.
Day & Night AQI Trend : Aug - Sep 2025
Custer, Washington, United States
24°C18/32°C
24°C17/32°C
22°C17/30°C
21°C18/23°C
21°C17/29°C
19°C16/24°C
18°C12/25°C
18°C14/23°C
19°C13/26°C
22°C14/31°C
20°C14/28°C
21°C15/29°C
19°C14/25°C
17°C15/20°C
17°C15/21°C
17°C13/22°C
18°C15/24°C
16°C13/18°C
16°C14/18°C
16°C10/22°C
15°C13/18°C
16°C10/23°C
22°C13/32°C
20°C15/25°C
16°C12/21°C
15°C8/24°C
16°C10/26°C
16°C12/21°C
15°C9/23°C
17°C11/27°C
--°C/°C
43AQI
37AQI
41AQI
40AQI
2025 Days Vs Air Quality
Custer, Washington, United States
97%
176
3%
6
Total number of days with different AQI categories in last 267 days in 2025 (98 days remaining)
Under WHO’s Safe Air Quality Limits: 97%
Health Risk Level:
Very Low
In 2025, 97% of 267 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
Custer, Washington, United States
AQI levels in 2025
Jan.
Feb.
Mar.
Apr.
May
Jun.
Jul.
Aug.
Sep.
Oct.
Nov.
Dec.
24AQI
19AQI
18AQI
21AQI
25AQI
21AQI
21AQI
29AQI
27AQI
33AQI
37AQI
37AQI
17AQI
20AQI
19AQI
19AQI
22AQI
21AQI
29AQI
33AQI
29AQI
24AQI
27AQI
30AQI
27AQI
26AQI
23AQI
27AQI
32AQI
42AQI
49AQI
42AQI
46AQI
32AQI
20AQI
23AQI
36AQI
40AQI
19AQI
22AQI
25AQI
26AQI
28AQI
19AQI
27AQI
36AQI
29AQI
25AQI
33AQI
27AQI
33AQI
26AQI
22AQI
19AQI
22AQI
15AQI
18AQI
24AQI
21AQI
27AQI
25AQI
21AQI
24AQI
28AQI
21AQI
23AQI
29AQI
26AQI
29AQI
28AQI
20AQI
28AQI
22AQI
29AQI
28AQI
28AQI
37AQI
38AQI
42AQI
37AQI
29AQI
29AQI
25AQI
23AQI
22AQI
20AQI
22AQI
30AQI
28AQI
30AQI
38AQI
31AQI
22AQI
21AQI
23AQI
26AQI
26AQI
23AQI
26AQI
22AQI
23AQI
27AQI
28AQI
24AQI
19AQI
18AQI
18AQI
24AQI
20AQI
26AQI
24AQI
25AQI
37AQI
40AQI
40AQI
39AQI
38AQI
39AQI
38AQI
36AQI
27AQI
20AQI
28AQI
32AQI
32AQI
34AQI
32AQI
26AQI
23AQI
21AQI
28AQI
42AQI
45AQI
40AQI
21AQI
22AQI
30AQI
32AQI
26AQI
27AQI
24AQI
27AQI
25AQI
14AQI
15AQI
16AQI
17AQI
18AQI
24AQI
25AQI
34AQI
44AQI
49AQI
53AQI
53AQI
49AQI
52AQI
40AQI
46AQI
47AQI
45AQI
67AQI
44AQI
58AQI
52AQI
33AQI
32AQI
38AQI
32AQI
31AQI
22AQI
28AQI
35AQI
26AQI
30AQI
47AQI
30AQI
28AQI
36AQI
25AQI
23AQI
32AQI
21AQI
29AQI
25AQI
28AQI
29AQI
32AQI
37AQI
No. of days
202529AQI
Highest AQI recorded in
September37AQI
Lowest AQI recorded in
March21AQI
Most & Least Polluted Years Over the Last 1 Years
Custer's annual 2025 AQI (29) shows an average percentage change of NaN% (improved AQI) compared to previous years: .