Seaside, California, United States Historical Air Quality Analysis
Dive into detailed Air Quality Insights with historical data, monthly patterns, and yearly trends at your fingertips!
February Air Quality Analysis
Seaside, California, United States
AQI Trends: Highest and Lowest
Same Day Analysis (18th February):
On this day, AQI across the 5 years varied significantly: 2026 ranks 1st highest AQI at 46 of Good air quality on the same day.
Download 2024 Annual Data
World Air Quality Report

Day & Night AQI Trend: 17th Feb - 18th Feb 2026
Seaside, California, United States
7 AM17th Feb 2026
5 PM
6 AM18th Feb 2026
106AQI
39AQI
46AQI
28AQI
In the last 24 hours,
Seaside's AQI reached its highest point of 106 at 11 AM during the Day, while the lowest point, 28, was recorded at 3 AM during the Night between 17th Feb and 18th Feb 2026.
Day & Night AQI Trend : Jan - Feb 2026
Seaside, California, United States
14°C8/22°C
12°C10/17°C
13°C9/19°C
12°C11/13°C
13°C9/18°C
12°C7/19°C
12°C8/18°C
13°C8/21°C
13°C9/20°C
14°C9/21°C
14°C9/20°C
16°C10/24°C
13°C9/20°C
13°C8/19°C
15°C9/24°C
18°C12/25°C
18°C14/25°C
15°C11/22°C
13°C9/18°C
13°C7/18°C
15°C10/22°C
13°C10/21°C
13°C10/17°C
13°C8/20°C
11°C7/14°C
10°C8/13°C
13°C9/19°C
10°C8/11°C
9°C6/12°C
7°C4/11°C
55AQI
33AQI
41AQI
27AQI
2026 Days Vs Air Quality
Seaside, California, United States
98%
48
2%
1
Total number of days with different AQI categories in last 50 days in 2026 (315 days remaining)
Under WHO’s Safe Air Quality Limits: 98%
Health Risk Level:
Very Low
In 2026, 98% of 50 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
Seaside, California, United States
AQI levels in 2026
Jan.
Feb.
Mar.
Apr.
May
Jun.
Jul.
Aug.
Sep.
Oct.
Nov.
Dec.
28AQI (US)
14AQI (US)
13AQI (US)
14AQI (US)
21AQI (US)
19AQI (US)
14AQI (US)
20AQI (US)
20AQI (US)
24AQI (US)
16AQI (US)
16AQI (US)
19AQI (US)
14AQI (US)
20AQI (US)
19AQI (US)
16AQI (US)
18AQI (US)
17AQI (US)
22AQI (US)
26AQI (US)
45AQI (US)
42AQI (US)
30AQI (US)
38AQI (US)
41AQI (US)
35AQI (US)
40AQI (US)
49AQI (US)
50AQI (US)
34AQI (US)
34AQI (US)
32AQI (US)
33AQI (US)
33AQI (US)
36AQI (US)
38AQI (US)
30AQI (US)
26AQI (US)
37AQI (US)
40AQI (US)
34AQI (US)
23AQI (US)
28AQI (US)
40AQI (US)
41AQI (US)
45AQI (US)
51AQI (US)
46AQI (US)
26AQI (US)
36AQI (US)
No. of days
202629AQI (US)
Highest AQI (US) recorded in
February36AQI (US)
Lowest AQI (US) recorded in
January26AQI (US)
202527AQI (US)
Highest AQI (US) recorded in
August32AQI (US)
Lowest AQI (US) recorded in
July21AQI (US)
202427AQI (US)
Highest AQI (US) recorded in
October32AQI (US)
Lowest AQI (US) recorded in
January24AQI (US)
202326AQI (US)
Highest AQI (US) recorded in
September32AQI (US)
Lowest AQI (US) recorded in
July20AQI (US)
202226AQI (US)
Highest AQI (US) recorded in
October33AQI (US)
Lowest AQI (US) recorded in
August16AQI (US)
202125AQI (US)
Highest AQI (US) recorded in
April30AQI (US)
Lowest AQI (US) recorded in
July21AQI (US)
202034AQI (US)
Highest AQI (US) recorded in
September60AQI (US)
Lowest AQI (US) recorded in
November22AQI (US)
Most & Least Polluted Years Over the Last 7 Years
Seaside's annual 2026 AQI (US) (29) shows an average percentage change of 8.7% (worsened AQI (US)) compared to previous years: 2020 (34), 2021 (25), 2022 (26), 2023 (26), 2024 (27), 2025 (27).