Dayton, 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
Dayton, 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 44 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
Dayton, Washington, United States
6 AM23rd Sep 2025
7 PM
5 AM24th Sep 2025
40AQI
33AQI
43AQI
37AQI
In the last 24 hours,
Dayton's AQI reached its highest point of 43 at 1 AM during the Night, while the lowest point, 33, was recorded at 6 AM during the Day between 23rd Sep and 24th Sep 2025.
Day & Night AQI Trend : Aug - Sep 2025
Dayton, Washington, United States
29°C22/36°C
29°C24/36°C
23°C18/26°C
24°C17/31°C
26°C21/33°C
26°C19/34°C
27°C20/35°C
27°C19/35°C
27°C18/36°C
30°C23/37°C
28°C20/36°C
28°C21/35°C
23°C17/31°C
22°C15/30°C
21°C14/30°C
21°C14/29°C
21°C15/27°C
19°C14/27°C
19°C13/26°C
22°C15/29°C
16°C12/21°C
14°C9/21°C
19°C10/28°C
22°C16/30°C
22°C14/29°C
23°C16/30°C
23°C18/30°C
18°C10/22°C
15°C9/22°C
18°C10/27°C
--°C/°C
46AQI
46AQI
46AQI
46AQI
2025 Days Vs Air Quality
Dayton, Washington, United States
88%
161
11%
20
0.5%
1
Total number of days with different AQI categories in last 267 days in 2025 (98 days remaining)
Under WHO’s Safe Air Quality Limits: 88%
Health Risk Level:
Low
In 2025, 88% of 267 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
Dayton, Washington, United States
AQI levels in 2025
Jan.
Feb.
Mar.
Apr.
May
Jun.
Jul.
Aug.
Sep.
Oct.
Nov.
Dec.
19AQI
17AQI
17AQI
14AQI
15AQI
16AQI
16AQI
19AQI
16AQI
17AQI
18AQI
17AQI
18AQI
13AQI
12AQI
15AQI
15AQI
16AQI
19AQI
19AQI
22AQI
21AQI
16AQI
17AQI
18AQI
18AQI
13AQI
13AQI
15AQI
23AQI
21AQI
24AQI
26AQI
17AQI
14AQI
16AQI
16AQI
19AQI
15AQI
13AQI
13AQI
15AQI
15AQI
15AQI
16AQI
17AQI
16AQI
14AQI
13AQI
15AQI
16AQI
12AQI
13AQI
12AQI
13AQI
12AQI
12AQI
16AQI
16AQI
16AQI
18AQI
17AQI
14AQI
15AQI
15AQI
14AQI
17AQI
14AQI
13AQI
15AQI
17AQI
18AQI
18AQI
19AQI
21AQI
22AQI
24AQI
24AQI
32AQI
22AQI
18AQI
19AQI
20AQI
21AQI
16AQI
16AQI
16AQI
13AQI
13AQI
19AQI
31AQI
32AQI
18AQI
14AQI
14AQI
14AQI
17AQI
21AQI
23AQI
18AQI
17AQI
22AQI
18AQI
19AQI
20AQI
18AQI
15AQI
17AQI
19AQI
19AQI
20AQI
19AQI
25AQI
35AQI
27AQI
31AQI
34AQI
27AQI
27AQI
27AQI
27AQI
20AQI
16AQI
16AQI
17AQI
19AQI
21AQI
28AQI
41AQI
49AQI
35AQI
23AQI
30AQI
26AQI
17AQI
17AQI
17AQI
21AQI
29AQI
25AQI
33AQI
26AQI
25AQI
14AQI
16AQI
19AQI
21AQI
22AQI
22AQI
27AQI
51AQI
59AQI
52AQI
53AQI
57AQI
59AQI
54AQI
54AQI
60AQI
57AQI
59AQI
61AQI
63AQI
97AQI
119AQI
70AQI
52AQI
45AQI
54AQI
54AQI
51AQI
53AQI
39AQI
23AQI
28AQI
30AQI
29AQI
35AQI
48AQI
31AQI
27AQI
44AQI
16AQI
17AQI
15AQI
19AQI
22AQI
34AQI
51AQI
No. of days
202525AQI
Highest AQI recorded in
September51AQI
Lowest AQI recorded in
May15AQI
Most & Least Polluted Years Over the Last 1 Years
Dayton's annual 2025 AQI (25) shows an average percentage change of NaN% (improved AQI) compared to previous years: .