Mount Vernon, Washington, United States Historical Air Quality Analysis
Dive into detailed Air Quality Insights with historical data, monthly patterns, and yearly trends at your fingertips!
August Air Quality Analysis
Mount Vernon, Washington, United States
AQI Trends: Highest and Lowest
Same Day Analysis (11th August ):
On this day, AQI across the 5 years varied significantly: 2025 ranks 1st highest AQI at 23 of Good air quality on the same day.
Download 2024 Annual Data
World Air Quality Report

Day & Night AQI Trend: 11th Aug - 12th Aug 2025
Mount Vernon, Washington, United States
5 AM11th Aug 2025
8 PM
4 AM12th Aug 2025
25AQI
22AQI
23AQI
21AQI
In the last 24 hours,
Mount Vernon's AQI reached its highest point of 25 at 1 PM during the Day, while the lowest point, 21, was recorded at 12 AM during the Night between 11th Aug and 12th Aug 2025.
Day & Night AQI Trend : Jul - Aug 2025
Mount Vernon, Washington, United States
20°C14/27°C
15°C13/19°C
18°C12/24°C
22°C17/27°C
18°C12/25°C
16°C13/18°C
14°C12/17°C
15°C10/18°C
16°C11/21°C
16°C14/19°C
17°C14/22°C
17°C14/21°C
14°C12/17°C
15°C11/21°C
15°C10/20°C
17°C12/23°C
18°C13/24°C
18°C13/25°C
18°C15/21°C
17°C14/21°C
16°C13/18°C
14°C12/15°C
15°C13/19°C
18°C12/22°C
17°C13/20°C
15°C12/21°C
15°C12/19°C
17°C12/22°C
19°C14/23°C
18°C14/23°C
--°C/°C
20AQI
18AQI
20AQI
18AQI
2025 Days Vs Air Quality
Mount Vernon, Washington, United States
100%
223
Total number of days with different AQI categories in last 224 days in 2025 (141 days remaining)
Under WHO’s Safe Air Quality Limits: 100%
Health Risk Level:
Very Low
In 2025, 100% of 224 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
Mount Vernon, Washington, United States
AQI levels in 2025
Jan.
Feb.
Mar.
Apr.
May
Jun.
Jul.
Aug.
Sep.
Oct.
Nov.
Dec.
26AQI
24AQI
22AQI
21AQI
24AQI
23AQI
22AQI
22AQI
22AQI
22AQI
22AQI
25AQI
28AQI
35AQI
30AQI
26AQI
26AQI
31AQI
31AQI
31AQI
38AQI
34AQI
34AQI
33AQI
27AQI
33AQI
36AQI
39AQI
43AQI
38AQI
23AQI
18AQI
20AQI
21AQI
20AQI
20AQI
21AQI
22AQI
24AQI
26AQI
22AQI
22AQI
26AQI
23AQI
21AQI
20AQI
19AQI
21AQI
22AQI
18AQI
18AQI
18AQI
19AQI
16AQI
19AQI
18AQI
23AQI
21AQI
24AQI
26AQI
25AQI
19AQI
20AQI
19AQI
19AQI
21AQI
18AQI
19AQI
18AQI
18AQI
17AQI
16AQI
16AQI
16AQI
16AQI
15AQI
15AQI
16AQI
15AQI
15AQI
15AQI
15AQI
16AQI
25AQI
20AQI
18AQI
17AQI
15AQI
17AQI
20AQI
18AQI
18AQI
18AQI
18AQI
18AQI
16AQI
13AQI
12AQI
13AQI
15AQI
16AQI
15AQI
17AQI
18AQI
17AQI
17AQI
17AQI
20AQI
19AQI
22AQI
23AQI
13AQI
13AQI
18AQI
21AQI
23AQI
19AQI
16AQI
13AQI
13AQI
17AQI
20AQI
13AQI
14AQI
13AQI
16AQI
15AQI
14AQI
15AQI
16AQI
15AQI
14AQI
15AQI
15AQI
16AQI
13AQI
13AQI
12AQI
12AQI
11AQI
12AQI
12AQI
12AQI
12AQI
13AQI
13AQI
14AQI
14AQI
13AQI
14AQI
15AQI
14AQI
14AQI
15AQI
15AQI
15AQI
16AQI
17AQI
17AQI
17AQI
19AQI
24AQI
23AQI
17AQI
17AQI
17AQI
16AQI
16AQI
14AQI
15AQI
15AQI
11AQI
12AQI
18AQI
23AQI
18AQI
14AQI
13AQI
13AQI
15AQI
16AQI
16AQI
14AQI
15AQI
16AQI
17AQI
16AQI
18AQI
18AQI
16AQI
15AQI
17AQI
17AQI
17AQI
16AQI
17AQI
21AQI
24AQI
22AQI
20AQI
18AQI
19AQI
18AQI
18AQI
17AQI
16AQI
17AQI
18AQI
19AQI
19AQI
19AQI
18AQI
18AQI
19AQI
22AQI
28AQI
29AQI
25AQI
16AQI
17AQI
18AQI
20AQI
23AQI
29AQI
21AQI
18AQI
17AQI
14AQI
16AQI
18AQI
21AQI
No. of days
202519AQI
Highest AQI recorded in
January29AQI
Lowest AQI recorded in
May14AQI
202416AQI
Highest AQI recorded in
August25AQI
Lowest AQI recorded in
September12AQI
202320AQI
Highest AQI recorded in
May38AQI
Lowest AQI recorded in
April13AQI
202224AQI
Highest AQI recorded in
October49AQI
Lowest AQI recorded in
April15AQI
202116AQI
Highest AQI recorded in
August29AQI
Lowest AQI recorded in
February8AQI
202024AQI
Highest AQI recorded in
September66AQI
Lowest AQI recorded in
June11AQI
Most & Least Polluted Years Over the Last 6 Years
Mount Vernon's annual 2025 AQI (19) shows an average percentage change of -2.8% (improved AQI) compared to previous years: 2020 (24), 2021 (16), 2022 (24), 2023 (20), 2024 (16).