Worst air pollution National City, today and tomorrow
Today (15 July): Air quality in National City is fair. AQI, PM10, and O3 are fair; PM2.5, NO2, SO2, CO, HCHO, and PM1 are good. Pollution peaks around 8:00 AM (PM10: 30.8/100).
Tomorrow (16 July 2026): Air quality in National City is fair. All pollutants stay as today. Pollution peaks around 8:00 AM (O3: 28.0/100). 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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National City's air quality reflects San Diego Bay's immediate southern shoreline adjacent to the Naval Base San Diego, with concentrated military vessel and vehicle operations generating elevated NOₓ and PM2.5 alongside vehicle traffic on I-5 and SR-54. The bay and Pacific coastal exposure provide maritime ventilation, while the naval base's industrial operations — including ship maintenance and dry dock activities — represent the most distinctive local emission source alongside the primary vehicle corridor throughout the year.
Today - 15 July | Pollution peaks at 08:00
AQI:
Fair
30.8/100
PM2.5 (fine particles):
Good
18.1/100
PM10 (coarse particles):
Fair
30.8/100
NO2 (nitrogen dioxide):
Good
0.4/100
O3 (ozone):
Fair
26.9/100
SO2 (sulfur dioxide):
Good
0.7/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
1.0/100
PM1 (ultrafine particles):
Good
3.0/100
Levels show the poorest local air quality during the day
Tomorrow - 16 July | Pollution peaks at 08:00
AQI:
Fair
28.0/100
PM2.5 (fine particles):
Good
12.2/100
PM10 (coarse particles):
Fair
22.1/100
NO2 (nitrogen dioxide):
Good
0.5/100
O3 (ozone):
Fair
28.0/100
SO2 (sulfur dioxide):
Good
0.8/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
0.9/100
PM1 (ultrafine particles):
Good
2.5/100
Pollen forecast in National City
View pollen forecastFrequently Asked Questions
Is air quality bad in National City right now?
On 15 July 2026, overall air quality in National City is fair. AQI is the main air quality indicator at 30.8/100. Pollution peaks around 8:00 AM (PM10: 30.8/100).
Will air quality be worse tomorrow in National City?
On 16 July 2026, air quality conditions in National City will be similar to today, with AQI forecast at fair at 28.0/100. Pollution peaks around 8:00 AM (O3: 28.0/100).
When is air pollution at its worst in National City?
Air quality in National City shifts across the year — the shortest stretch of clean air usually falls in the wetter winter months, whereas 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 National City 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