Worst air pollution Seaside, today and tomorrow
Today (15 July): Air quality in Seaside is poor. AQI and O3 are poor; PM2.5, PM10, NO2, SO2, CO, HCHO, and PM1 are good. Pollution peaks around 9:00 AM (O3: 60.3/100).
Tomorrow (16 July 2026): Air quality in Seaside is medium. AQI improves to medium; O3 decreases to medium; all other pollutants stay as today. Pollution peaks around 9:00 AM (O3: 44.2/100). Airmine updates local air quality forecasts four times daily.
For long term forecasts and maps, see the Airmine app
Developed with support from the European Space Agency (ESA)’s Business Applications and Space Solutions (BASS) team
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Seaside's air quality in California benefits from direct Monterey Bay coastal exposure, with consistent Pacific fog and sea breezes providing reliable maritime ventilation. Vehicle emissions from SR-1 and the former Fort Ord's conversion contribute modest local sources, while the exceptional Pacific coastal exposure generally maintains Seaside among California's cleaner coastal urban environments throughout most of the year.
Today - 15 July | Pollution peaks at 09:00
AQI:
Poor
60.3/100
PM2.5 (fine particles):
Good
17.5/100
PM10 (coarse particles):
Good
9.3/100
NO2 (nitrogen dioxide):
Good
18.7/100
O3 (ozone):
Poor
60.3/100
SO2 (sulfur dioxide):
Good
3.8/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
3.2/100
PM1 (ultrafine particles):
Good
12.0/100
Levels show the poorest local air quality during the day
Tomorrow - 16 July | Pollution peaks at 09:00
AQI:
Medium
44.2/100
PM2.5 (fine particles):
Good
18.5/100
PM10 (coarse particles):
Good
9.3/100
NO2 (nitrogen dioxide):
Good
17.9/100
O3 (ozone):
Medium
44.2/100
SO2 (sulfur dioxide):
Good
2.9/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
2.5/100
PM1 (ultrafine particles):
Good
12.7/100
Pollen forecast in Seaside
View pollen forecastFrequently Asked Questions
Is air quality bad in Seaside right now?
On 15 July 2026, overall air quality in Seaside is poor. AQI is the main air quality indicator at 60.3/100. Pollution peaks around 9:00 AM (O3: 60.3/100).
Will air quality be worse tomorrow in Seaside?
On 16 July 2026, air quality conditions in Seaside will be better than today, with AQI forecast at medium at 44.2/100. Pollution peaks around 9:00 AM (O3: 44.2/100).
When is air pollution at its worst in Seaside?
Seasonal changes shape air quality across Seaside, as winter typically brings the cleanest stretch, once occasional rain clears the basin; by contrast, summer and early autumn bring the highest ozone levels, and wildfire smoke can spike particulate readings sharply from August through October. Coastal breezes offer some relief compared to inland valley locations that see heavier smog buildup.
Are air quality levels in Seaside based on measurements or forecasts?
It is forecasts derived by downscaling forecasts provided by EU’s Copernicus Atmosphere Monitoring Service (CAMS) by taking into account local conditions such as traffic patterns. CAMS bases its forecast on satellite measurements of particles and chemical compounds in the atmosphere. Airmine’s services were developed with support from the European Space Agency (ESA)’s Business Applications and Space Solutions (BASS) team.
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Data provided by Airmine — Last update: 16 July 2026 at 10:33 CEST (Data is updated four times daily.)
This forecast is produced independently using Airmine's own atmospheric data and models.
Unless explicitly made clear, the content on this site has not been paid for by external organisations and is Airmine's sole responsibility.
For long term forecasts and maps, see the Airmine app