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!
March Air Quality Analysis
Mount Vernon, Washington, United States
AQI Trends: Highest and Lowest
Same Day Analysis (12th March):
On this day, AQI across the 5 years varied significantly: 2026 ranks 1st highest AQI at 38 of Good air quality on the same day.
Download 2024 Annual Data
World Air Quality Report

Day & Night AQI Trend: 11th Mar - 12th Mar 2026
Mount Vernon, Washington, United States
7 AM11th Mar 2026
5 PM
6 AM12th Mar 2026
67AQI
30AQI
56AQI
8AQI
In the last 24 hours,
Mount Vernon's AQI reached its highest point of 67 at 6 PM during the Day, while the lowest point, 8, was recorded at 3 AM during the Night between 11th Mar and 12th Mar 2026.
Day & Night AQI Trend : Feb - Mar 2026
Mount Vernon, Washington, United States
6°C3/11°C
5°C0/11°C
6°C4/8°C
5°C2/8°C
4°C1/9°C
3°C1/8°C
4°C0/10°C
2°C0/4°C
3°C0/7°C
1°C-5/7°C
6°C2/11°C
8°C5/12°C
8°C4/11°C
5°C2/11°C
5°C2/8°C
7°C5/10°C
7°C6/10°C
6°C3/12°C
6°C2/13°C
6°C0/15°C
9°C6/13°C
9°C8/11°C
8°C6/11°C
8°C6/9°C
10°C9/12°C
7°C4/9°C
4°C1/6°C
3°C0/6°C
6°C4/10°C
5°C2/7°C
41AQI
30AQI
34AQI
25AQI
2026 Days Vs Air Quality
Mount Vernon, Washington, United States
97%
69
3%
2
Total number of days with different AQI categories in last 72 days in 2026 (293 days remaining)
Under WHO’s Safe Air Quality Limits: 97%
Health Risk Level:
Very Low
In 2026, 97% of 72 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 2026
Jan.
Feb.
Mar.
Apr.
May
Jun.
Jul.
Aug.
Sep.
Oct.
Nov.
Dec.
23AQI (US)
18AQI (US)
14AQI (US)
15AQI (US)
21AQI (US)
20AQI (US)
16AQI (US)
17AQI (US)
19AQI (US)
18AQI (US)
21AQI (US)
16AQI (US)
18AQI (US)
18AQI (US)
15AQI (US)
20AQI (US)
18AQI (US)
19AQI (US)
22AQI (US)
21AQI (US)
24AQI (US)
45AQI (US)
52AQI (US)
48AQI (US)
46AQI (US)
45AQI (US)
42AQI (US)
45AQI (US)
52AQI (US)
45AQI (US)
44AQI (US)
50AQI (US)
49AQI (US)
48AQI (US)
43AQI (US)
44AQI (US)
22AQI (US)
27AQI (US)
34AQI (US)
35AQI (US)
30AQI (US)
24AQI (US)
20AQI (US)
29AQI (US)
37AQI (US)
31AQI (US)
32AQI (US)
38AQI (US)
32AQI (US)
32AQI (US)
19AQI (US)
25AQI (US)
32AQI (US)
31AQI (US)
29AQI (US)
29AQI (US)
35AQI (US)
23AQI (US)
20AQI (US)
27AQI (US)
32AQI (US)
25AQI (US)
38AQI (US)
30AQI (US)
36AQI (US)
43AQI (US)
35AQI (US)
37AQI (US)
32AQI (US)
40AQI (US)
38AQI (US)
28AQI (US)
32AQI (US)
34AQI (US)
No. of days
202631AQI (US)
Highest AQI (US) recorded in
March34AQI (US)
Lowest AQI (US) recorded in
January28AQI (US)
202521AQI (US)
Highest AQI (US) recorded in
October36AQI (US)
Lowest AQI (US) recorded in
May14AQI (US)
202416AQI (US)
Highest AQI (US) recorded in
August25AQI (US)
Lowest AQI (US) recorded in
September12AQI (US)
202320AQI (US)
Highest AQI (US) recorded in
May38AQI (US)
Lowest AQI (US) recorded in
April13AQI (US)
202224AQI (US)
Highest AQI (US) recorded in
October49AQI (US)
Lowest AQI (US) recorded in
April15AQI (US)
202116AQI (US)
Highest AQI (US) recorded in
August29AQI (US)
Lowest AQI (US) recorded in
February8AQI (US)
202024AQI (US)
Highest AQI (US) recorded in
September66AQI (US)
Lowest AQI (US) recorded in
June11AQI (US)
Most & Least Polluted Years Over the Last 7 Years
Mount Vernon's annual 2026 AQI (US) (31) shows an average percentage change of 53.7% (worsened AQI (US)) compared to previous years: 2020 (24), 2021 (16), 2022 (24), 2023 (20), 2024 (16), 2025 (21).