Worst air pollution St. Augustine, today and tomorrow
Today (20 September): Air quality in St. Augustine is poor. AQI and PM10 are poor; PM2.5 is moderate; NO2, O3, SO2, CO, HCHO, and PM1 are good. Pollution peaks around 10:00 AM (PM10: 72.8/100).
Tomorrow (21 September 2026): Air quality in St. Augustine is moderate. AQI improves to moderate; PM10 decreases to moderate; all other pollutants stay as today. Pollution peaks around 9:00 AM (PM10: 55.0/100). 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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St. Augustine's air quality benefits from its Atlantic coastal position in northeast Florida, with consistent onshore sea breezes providing reliable maritime ventilation along the Florida First Coast. Vehicle emissions from US-1 and I-95 are the primary local sources, while summer ozone from subtropical heat and the Jacksonville-St. Augustine metropolitan traffic is the primary warm-season concern, and the flat coastal terrain and Atlantic exposure prevent significant pollution accumulation.
Today - 20 September | Pollution peaks at 10:00
AQI:
Poor
72.8/100
PM2.5 (fine particles):
Moderate
47.6/100
PM10 (coarse particles):
Poor
72.8/100
NO2 (nitrogen dioxide):
Good
0.2/100
O3 (ozone):
Good
12.6/100
SO2 (sulfur dioxide):
Good
0.2/100
CO (carbon monoxide):
Good
0.4/100
HCHO (formaldehyde):
Good
0.8/100
PM1 (ultrafine particles):
Good
2.5/100
Levels show the poorest local air quality during the day
Tomorrow - 21 September | Pollution peaks at 09:00
AQI:
Moderate
55.0/100
PM2.5 (fine particles):
Moderate
42.9/100
PM10 (coarse particles):
Moderate
55.0/100
NO2 (nitrogen dioxide):
Good
0.2/100
O3 (ozone):
Good
14.1/100
SO2 (sulfur dioxide):
Good
0.2/100
CO (carbon monoxide):
Good
0.4/100
HCHO (formaldehyde):
Good
0.8/100
PM1 (ultrafine particles):
Good
2.1/100
Pollen forecast in St. Augustine
View pollen forecastAir quality forecasts for neighbourhoods and landmarks in St. Augustine
Frequently Asked Questions
Is air quality bad in St. Augustine right now?
On 20 September 2026, overall air quality in St. Augustine is poor. AQI is the main air quality indicator at 72.8/100. Pollution peaks around 10:00 AM (PM10: 72.8/100).
Will air quality be worse tomorrow in St. Augustine?
On 21 September 2026, air quality conditions in St. Augustine will be better than today, with AQI forecast at moderate at 55.0/100. Pollution peaks around 9:00 AM (PM10: 55.0/100).
When is air pollution at its worst in St. Augustine?
St. Augustine sees air quality change through the year, as the wet season's frequent storms generally keep particulate levels lower than in the dry months; by contrast, wildfire and prescribed-burn smoke are most common in the drier months from autumn through spring. Inland areas tend to see more smoke buildup than locations closer to the coast.
Are air quality levels in St. Augustine 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 14:33 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.
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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