Worst air pollution Balboa Park Museums - San Diego, today and tomorrow
Today (20 September): Air quality in Balboa Park Museums is moderate. AQI, PM2.5, and PM10 are moderate; NO2, O3, SO2, CO, HCHO, and PM1 are good. Pollution peaks around 9:00 AM (PM10: 56.0/100).
Tomorrow (21 September 2026): Air quality in Balboa Park Museums is moderate. PM2.5 decreases to fair; all other pollutants stay as today. Pollution peaks around 2:00 AM (PM10: 46.1/100). Airmine updates local air quality forecasts four times daily.
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Developed with support from the European Space Agency (ESA)’s Business Applications and Space Solutions (BASS) team
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San Diego's Balboa Park Museums air quality benefits from the 1,200-acre elevated mesa park's substantial tree canopy providing exceptional natural filtration. Vehicle traffic on El Prado and the surrounding visitor traffic contribute local sources, while the Pacific sea breeze and the park's elevated mesa position generally maintain the Balboa Park museum campus among San Diego's more moderately ventilated major cultural institutions throughout most of the year.
Today - 20 September | Pollution peaks at 09:00
AQI:
Moderate
56.0/100
PM2.5 (fine particles):
Moderate
41.2/100
PM10 (coarse particles):
Moderate
56.0/100
NO2 (nitrogen dioxide):
Good
9.3/100
O3 (ozone):
Good
16.2/100
SO2 (sulfur dioxide):
Good
0.2/100
CO (carbon monoxide):
Good
0.4/100
HCHO (formaldehyde):
Good
0.9/100
PM1 (ultrafine particles):
Good
9.0/100
Levels show the poorest local air quality during the day
Tomorrow - 21 September | Pollution peaks at 02:00
AQI:
Moderate
46.1/100
PM2.5 (fine particles):
Fair
39.3/100
PM10 (coarse particles):
Moderate
46.1/100
NO2 (nitrogen dioxide):
Good
11.5/100
O3 (ozone):
Good
17.2/100
SO2 (sulfur dioxide):
Good
0.5/100
CO (carbon monoxide):
Good
0.4/100
HCHO (formaldehyde):
Good
1.2/100
PM1 (ultrafine particles):
Good
10.9/100
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Frequently Asked Questions
Is air quality bad in Balboa Park Museums right now?
On 20 September 2026, overall air quality in Balboa Park Museums is moderate. AQI is the main air quality indicator at 56.0/100. Pollution peaks around 9:00 AM (PM10: 56.0/100).
Will air quality be worse tomorrow in Balboa Park Museums?
On 21 September 2026, air quality conditions in Balboa Park Museums will be similar to today, with AQI forecast at moderate at 46.1/100. Pollution peaks around 2:00 AM (PM10: 46.1/100).
When is air pollution at its worst in Balboa Park Museums?
This landmark in San Diego sees air quality shift through the year: the shortest stretch of clean air usually falls in the wetter winter months, but hot, sunny summer conditions drive persistent ozone problems, compounded by wildfire smoke risk into early autumn. Coastal breezes offer some relief compared to inland valley locations that see heavier smog buildup.
Are air quality levels in Balboa Park Museums 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.
Why doesn’t the forecast always reflect wildfire impacts?
Airmine’s forecast uses CAMS (Copernicus Atmosphere Monitoring Service) as its background atmospheric model. While CAMS includes wildfire emissions, these are derived from satellite observations and are not available in real time. During rapidly evolving wildfire events, there may therefore be a delay before increased emissions are incorporated into the model. As a result, the forecast may temporarily underestimate PM₂.₅ and other pollutants associated with wildfire smoke.
During rapidly evolving wildfire events, CAMS may lag by approximately 1–2 days before increased wildfire emissions are fully represented, which can lead to temporary underestimation of PM₂.₅ concentrations in Airmine’s forecast.
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Data provided by Airmine — Last update: 20 September 2026 at 20:27 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.
Disclaimer: Forecasts are provided for informational purposes only and should not be relied upon as medical advice. Actual pollen and air quality conditions may vary from the forecast. If you have allergies, asthma, or another medical condition, consult a healthcare professional. Please see our Terms of Service for important information about limitations of liability.
Some text on this page may be generated or summarised using artificial intelligence (AI). Wherever possible, AI-generated content is enriched with Airmine's proprietary data to improve its accuracy and relevance. However, AI-generated content may still contain errors, omissions, or inaccuracies.
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