Prosser, 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
Prosser, Washington, United States
AQI Trends: Highest and Lowest
Same Day Analysis (22nd September ):
On this day, AQI across the 1 years varied significantly: 2025 ranks 1st highest AQI at 29 of Good air quality on the same day.
Download 2024 Annual Data
World Air Quality Report

Day & Night AQI Trend: 22nd Sep - 23rd Sep 2025
Prosser, Washington, United States
6 AM22nd Sep 2025
7 PM
5 AM23rd Sep 2025
46AQI
22AQI
58AQI
31AQI
In the last 24 hours,
Prosser's AQI reached its highest point of 58 at 2 AM during the Night, while the lowest point, 22, was recorded at 7 AM during the Day between 22nd Sep and 23rd Sep 2025.
Day & Night AQI Trend : Aug - Sep 2025
Prosser, Washington, United States
28°C18/39°C
28°C19/39°C
28°C18/39°C
26°C19/34°C
25°C18/34°C
25°C16/36°C
25°C14/36°C
26°C16/37°C
26°C18/37°C
27°C16/39°C
29°C18/41°C
28°C18/39°C
28°C17/37°C
24°C17/33°C
24°C15/33°C
22°C14/31°C
21°C14/31°C
22°C14/32°C
22°C15/30°C
21°C12/30°C
22°C13/33°C
18°C13/24°C
17°C8/27°C
19°C9/29°C
21°C11/32°C
21°C11/31°C
22°C12/33°C
23°C15/33°C
18°C10/25°C
16°C9/25°C
--°C/°C
55AQI
55AQI
56AQI
53AQI
2025 Days Vs Air Quality
Prosser, Washington, United States
88%
160
11%
20
0.5%
1
Total number of days with different AQI categories in last 266 days in 2025 (99 days remaining)
Under WHO’s Safe Air Quality Limits: 88%
Health Risk Level:
Low
In 2025, 88% of 266 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
Prosser, Washington, United States
AQI levels in 2025
Jan.
Feb.
Mar.
Apr.
May
Jun.
Jul.
Aug.
Sep.
Oct.
Nov.
Dec.
24AQI
19AQI
16AQI
15AQI
19AQI
16AQI
17AQI
18AQI
19AQI
21AQI
31AQI
29AQI
24AQI
13AQI
14AQI
19AQI
15AQI
16AQI
20AQI
26AQI
28AQI
28AQI
19AQI
21AQI
20AQI
21AQI
14AQI
17AQI
23AQI
27AQI
31AQI
34AQI
30AQI
18AQI
15AQI
20AQI
23AQI
23AQI
18AQI
14AQI
15AQI
21AQI
21AQI
18AQI
21AQI
23AQI
18AQI
17AQI
17AQI
17AQI
17AQI
13AQI
12AQI
12AQI
14AQI
11AQI
12AQI
16AQI
17AQI
18AQI
22AQI
21AQI
15AQI
21AQI
23AQI
18AQI
28AQI
15AQI
17AQI
20AQI
20AQI
21AQI
28AQI
23AQI
30AQI
34AQI
32AQI
31AQI
33AQI
22AQI
20AQI
24AQI
22AQI
26AQI
19AQI
17AQI
24AQI
11AQI
12AQI
30AQI
45AQI
37AQI
19AQI
14AQI
12AQI
16AQI
24AQI
29AQI
26AQI
21AQI
19AQI
29AQI
18AQI
22AQI
28AQI
23AQI
15AQI
17AQI
21AQI
20AQI
20AQI
25AQI
29AQI
37AQI
33AQI
23AQI
25AQI
38AQI
31AQI
34AQI
33AQI
19AQI
17AQI
17AQI
20AQI
25AQI
33AQI
35AQI
43AQI
53AQI
36AQI
29AQI
44AQI
27AQI
16AQI
17AQI
22AQI
27AQI
29AQI
29AQI
29AQI
30AQI
22AQI
13AQI
15AQI
19AQI
22AQI
21AQI
21AQI
27AQI
41AQI
54AQI
54AQI
59AQI
60AQI
61AQI
56AQI
54AQI
55AQI
58AQI
63AQI
71AQI
77AQI
96AQI
112AQI
71AQI
49AQI
31AQI
49AQI
56AQI
53AQI
53AQI
37AQI
22AQI
40AQI
46AQI
47AQI
55AQI
57AQI
35AQI
29AQI
18AQI
22AQI
18AQI
23AQI
25AQI
35AQI
55AQI
No. of days
202528AQI
Highest AQI recorded in
September55AQI
Lowest AQI recorded in
May18AQI
Most & Least Polluted Years Over the Last 1 Years
Prosser's annual 2025 AQI (28) shows an average percentage change of NaN% (improved AQI) compared to previous years: .