Kennewick, 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
Kennewick, Washington, United States
AQI Trends: Highest and Lowest
Same Day Analysis (24th September ):
On this day, AQI across the 5 years varied significantly: 2025 ranks 1st highest AQI at 54 of Moderate air quality on the same day.
Download 2024 Annual Data
World Air Quality Report

Day & Night AQI Trend: 24th Sep - 25th Sep 2025
Kennewick, Washington, United States
6 AM24th Sep 2025
7 PM
5 AM25th Sep 2025
58AQI
53AQI
60AQI
39AQI
In the last 24 hours,
Kennewick's AQI reached its highest point of 60 at 12 AM during the Night, while the lowest point, 39, was recorded at 4 AM during the Night between 24th Sep and 25th Sep 2025.
Day & Night AQI Trend : Aug - Sep 2025
Kennewick, Washington, United States
30°C20/41°C
26°C22/30°C
27°C18/35°C
28°C18/38°C
28°C17/38°C
29°C20/38°C
28°C19/39°C
29°C17/40°C
30°C19/41°C
29°C18/41°C
29°C20/39°C
24°C20/31°C
25°C17/35°C
24°C15/34°C
23°C15/33°C
24°C15/33°C
23°C17/32°C
22°C14/31°C
23°C14/34°C
18°C15/25°C
19°C12/28°C
21°C11/31°C
22°C12/33°C
23°C14/33°C
24°C15/34°C
24°C15/35°C
21°C14/25°C
18°C9/27°C
18°C8/28°C
19°C8/31°C
--°C/°C
53AQI
53AQI
53AQI
53AQI
2025 Days Vs Air Quality
Kennewick, Washington, United States
93%
247
7%
19
0.3%
1
Total number of days with different AQI categories in last 268 days in 2025 (97 days remaining)
Under WHO’s Safe Air Quality Limits: 93%
Health Risk Level:
Very Low
In 2025, 93% of 268 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
Kennewick, Washington, United States
AQI levels in 2025
Jan.
Feb.
Mar.
Apr.
May
Jun.
Jul.
Aug.
Sep.
Oct.
Nov.
Dec.
30AQI
24AQI
20AQI
20AQI
23AQI
21AQI
24AQI
26AQI
21AQI
21AQI
18AQI
21AQI
23AQI
31AQI
41AQI
32AQI
28AQI
26AQI
26AQI
27AQI
36AQI
43AQI
45AQI
37AQI
23AQI
24AQI
30AQI
33AQI
44AQI
54AQI
47AQI
15AQI
18AQI
19AQI
21AQI
21AQI
26AQI
24AQI
24AQI
28AQI
22AQI
23AQI
25AQI
22AQI
20AQI
24AQI
34AQI
41AQI
34AQI
24AQI
22AQI
28AQI
44AQI
19AQI
18AQI
17AQI
21AQI
25AQI
27AQI
27AQI
34AQI
19AQI
21AQI
18AQI
18AQI
17AQI
19AQI
19AQI
18AQI
18AQI
19AQI
16AQI
15AQI
16AQI
15AQI
14AQI
15AQI
19AQI
18AQI
14AQI
17AQI
16AQI
15AQI
20AQI
30AQI
22AQI
17AQI
17AQI
18AQI
16AQI
17AQI
18AQI
17AQI
21AQI
26AQI
28AQI
19AQI
12AQI
12AQI
18AQI
16AQI
16AQI
16AQI
27AQI
29AQI
25AQI
19AQI
21AQI
21AQI
21AQI
16AQI
12AQI
17AQI
24AQI
24AQI
25AQI
30AQI
22AQI
13AQI
15AQI
18AQI
19AQI
21AQI
13AQI
13AQI
17AQI
21AQI
19AQI
18AQI
21AQI
14AQI
14AQI
14AQI
21AQI
18AQI
15AQI
12AQI
12AQI
13AQI
12AQI
12AQI
14AQI
15AQI
15AQI
17AQI
19AQI
14AQI
17AQI
30AQI
15AQI
46AQI
15AQI
14AQI
15AQI
17AQI
17AQI
21AQI
18AQI
19AQI
25AQI
28AQI
34AQI
45AQI
24AQI
32AQI
19AQI
21AQI
19AQI
18AQI
17AQI
24AQI
12AQI
12AQI
18AQI
36AQI
31AQI
18AQI
13AQI
12AQI
14AQI
17AQI
24AQI
35AQI
22AQI
17AQI
20AQI
17AQI
19AQI
24AQI
19AQI
15AQI
17AQI
20AQI
22AQI
24AQI
25AQI
26AQI
32AQI
27AQI
27AQI
39AQI
43AQI
30AQI
27AQI
26AQI
18AQI
16AQI
17AQI
17AQI
23AQI
30AQI
33AQI
36AQI
50AQI
26AQI
32AQI
42AQI
22AQI
16AQI
16AQI
19AQI
23AQI
26AQI
27AQI
27AQI
24AQI
19AQI
17AQI
19AQI
21AQI
23AQI
21AQI
20AQI
28AQI
42AQI
54AQI
55AQI
57AQI
57AQI
58AQI
55AQI
54AQI
55AQI
55AQI
57AQI
68AQI
69AQI
91AQI
110AQI
70AQI
46AQI
36AQI
45AQI
55AQI
49AQI
52AQI
34AQI
23AQI
35AQI
39AQI
35AQI
48AQI
55AQI
38AQI
30AQI
50AQI
54AQI
30AQI
25AQI
19AQI
20AQI
17AQI
21AQI
24AQI
34AQI
52AQI
No. of days
202526AQI
Highest AQI recorded in
September52AQI
Lowest AQI recorded in
May17AQI
202425AQI
Highest AQI recorded in
July36AQI
Lowest AQI recorded in
March15AQI
202327AQI
Highest AQI recorded in
August56AQI
Lowest AQI recorded in
April13AQI
202225AQI
Highest AQI recorded in
September46AQI
Lowest AQI recorded in
May11AQI
202127AQI
Highest AQI recorded in
August62AQI
Lowest AQI recorded in
December13AQI
202039AQI
Highest AQI recorded in
September126AQI
Lowest AQI recorded in
May17AQI
Most & Least Polluted Years Over the Last 6 Years
Kennewick's annual 2025 AQI (26) shows an average percentage change of -5.9% (improved AQI) compared to previous years: 2020 (39), 2021 (27), 2022 (25), 2023 (27), 2024 (25).