Worst air pollution Serenity Swing / Tree of Life - San Luis Obispo, today and tomorrow
Today (20 September): Air quality in Serenity Swing / Tree of Life is moderate. AQI, PM2.5, and PM10 are moderate; NO2 is fair; O3, SO2, CO, HCHO, and PM1 are good. Pollution peaks around 4:00 AM (PM10: 42.1/100).
Tomorrow (21 September 2026): Air quality in Serenity Swing / Tree of Life is fair. AQI improves to fair; PM2.5 decreases to fair; PM10 decreases to fair; O3 increases to fair; all other pollutants stay as today. Pollution peaks around 5:00 PM (PM2.5: 36.0/100). 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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In Serenity Swing / Tree of Life, modest traffic volumes mean local air quality leans more on farmland dust and seasonal burning than on vehicle emissions. Tree cover nearby helps soften the local particulate load to a degree. Nearby areas with a similar setup tend to show a comparable air quality baseline.
Today - 20 September | Pollution peaks at 04:00
AQI:
Moderate
42.1/100
PM2.5 (fine particles):
Moderate
40.6/100
PM10 (coarse particles):
Moderate
42.1/100
NO2 (nitrogen dioxide):
Fair
26.7/100
O3 (ozone):
Good
15.4/100
SO2 (sulfur dioxide):
Good
2.2/100
CO (carbon monoxide):
Good
0.6/100
HCHO (formaldehyde):
Good
2.3/100
PM1 (ultrafine particles):
Good
11.3/100
Levels show the poorest local air quality during the day
Tomorrow - 21 September | Pollution peaks at 17:00
AQI:
Fair
36.0/100
PM2.5 (fine particles):
Fair
36.0/100
PM10 (coarse particles):
Fair
22.6/100
NO2 (nitrogen dioxide):
Fair
34.3/100
O3 (ozone):
Fair
20.7/100
SO2 (sulfur dioxide):
Good
1.7/100
CO (carbon monoxide):
Good
0.6/100
HCHO (formaldehyde):
Good
2.4/100
PM1 (ultrafine particles):
Good
10.7/100
Other Landmarks in San Luis Obispo
Frequently Asked Questions
Is air quality bad in Serenity Swing / Tree of Life right now?
On 20 September 2026, overall air quality in Serenity Swing / Tree of Life is moderate. AQI is the main air quality indicator at 42.1/100. Pollution peaks around 4:00 AM (PM10: 42.1/100).
Will air quality be worse tomorrow in Serenity Swing / Tree of Life?
On 21 September 2026, air quality conditions in Serenity Swing / Tree of Life will be better than today, with AQI forecast at fair at 36.0/100. Pollution peaks around 5:00 PM (PM2.5: 36.0/100).
When is air pollution at its worst in Serenity Swing / Tree of Life?
From September to November, average wind speeds run around 11 km/h with temperatures near 17°C, calm and cool enough to let particulate matter and smoke build up near the ground rather than disperse. From July to September, temperatures average around 22°C, warm enough for strong sun and heat to drive ground-level ozone formation.
Are air quality levels in Serenity Swing / Tree of Life 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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