Seattle, 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
Seattle, Washington, United States
AQI Trends: Highest and Lowest
Same Day Analysis (8th March):
On this day, AQI across the 5 years varied significantly: 2026 ranks 4th highest AQI at 35 of Good air quality, showing improvement over 2024, 2023 and 2022 on the same day.
Download 2024 Annual Data
World Air Quality Report

Day & Night AQI Trend: 7th Mar - 8th Mar 2026
Seattle, Washington, United States
7 AM7th Mar 2026
5 PM
6 AM8th Mar 2026
64AQI
33AQI
42AQI
12AQI
In the last 24 hours,
Seattle's AQI reached its highest point of 64 at 11 AM during the Day, while the lowest point, 12, was recorded at 5 AM during the Night between 7th Mar and 8th Mar 2026.
Day & Night AQI Trend : Feb - Mar 2026
Seattle, Washington, United States
9°C6/10°C
8°C5/13°C
7°C5/10°C
8°C3/14°C
6°C3/12°C
5°C1/11°C
7°C5/8°C
6°C4/9°C
5°C2/9°C
3°C0/6°C
3°C1/9°C
3°C1/6°C
2°C0/5°C
2°C-2/6°C
5°C2/9°C
8°C6/12°C
8°C5/10°C
5°C2/9°C
5°C1/9°C
7°C4/12°C
8°C6/10°C
7°C4/11°C
7°C2/14°C
7°C2/15°C
9°C7/12°C
9°C7/10°C
8°C6/10°C
8°C6/9°C
10°C9/12°C
7°C4/10°C
40AQI
29AQI
32AQI
26AQI
2026 Days Vs Air Quality
Seattle, Washington, United States
96%
64
4%
3
Total number of days with different AQI categories in last 68 days in 2026 (297 days remaining)
Under WHO’s Safe Air Quality Limits: 96%
Health Risk Level:
Very Low
In 2026, 96% of 68 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
Seattle, Washington, United States
AQI levels in 2026
Jan.
Feb.
Mar.
Apr.
May
Jun.
Jul.
Aug.
Sep.
Oct.
Nov.
Dec.
54AQI (US)
38AQI (US)
25AQI (US)
16AQI (US)
22AQI (US)
19AQI (US)
17AQI (US)
16AQI (US)
18AQI (US)
34AQI (US)
30AQI (US)
18AQI (US)
22AQI (US)
21AQI (US)
18AQI (US)
23AQI (US)
29AQI (US)
45AQI (US)
53AQI (US)
49AQI (US)
53AQI (US)
29AQI (US)
32AQI (US)
26AQI (US)
25AQI (US)
36AQI (US)
36AQI (US)
25AQI (US)
45AQI (US)
43AQI (US)
35AQI (US)
43AQI (US)
42AQI (US)
33AQI (US)
24AQI (US)
31AQI (US)
28AQI (US)
29AQI (US)
26AQI (US)
39AQI (US)
37AQI (US)
27AQI (US)
21AQI (US)
36AQI (US)
48AQI (US)
30AQI (US)
28AQI (US)
34AQI (US)
37AQI (US)
32AQI (US)
20AQI (US)
31AQI (US)
34AQI (US)
28AQI (US)
29AQI (US)
26AQI (US)
41AQI (US)
20AQI (US)
21AQI (US)
27AQI (US)
36AQI (US)
24AQI (US)
45AQI (US)
35AQI (US)
34AQI (US)
42AQI (US)
35AQI (US)
31AQI (US)
31AQI (US)
35AQI (US)
No. of days
202631AQI (US)
Highest AQI (US) recorded in
March35AQI (US)
Lowest AQI (US) recorded in
January31AQI (US)
202532AQI (US)
Highest AQI (US) recorded in
January42AQI (US)
Lowest AQI (US) recorded in
May22AQI (US)
202428AQI (US)
Highest AQI (US) recorded in
September35AQI (US)
Lowest AQI (US) recorded in
February21AQI (US)
202332AQI (US)
Highest AQI (US) recorded in
August39AQI (US)
Lowest AQI (US) recorded in
April25AQI (US)
202233AQI (US)
Highest AQI (US) recorded in
October65AQI (US)
Lowest AQI (US) recorded in
May22AQI (US)
202127AQI (US)
Highest AQI (US) recorded in
August34AQI (US)
Lowest AQI (US) recorded in
May20AQI (US)
202035AQI (US)
Highest AQI (US) recorded in
September82AQI (US)
Lowest AQI (US) recorded in
June23AQI (US)
Most & Least Polluted Years Over the Last 7 Years
Seattle's annual 2026 AQI (US) (31) shows an average percentage change of 1.6% (worsened AQI (US)) compared to previous years: 2020 (35), 2021 (27), 2022 (33), 2023 (32), 2024 (28), 2025 (32).