Worst air pollution Santa Clarita, today and tomorrow
Today (20 September): Air quality in Santa Clarita is moderate. AQI and PM10 are moderate; PM2.5, NO2, and O3 are fair; SO2, CO, HCHO, and PM1 are good. Pollution peaks around 10:00 AM (PM10: 43.5/100).
Tomorrow (21 September 2026): Air quality in Santa Clarita is moderate. NO2 decreases to good; O3 increases to moderate; all other pollutants stay as today. Pollution peaks around 3:00 AM (O3: 50.1/100). 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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Santa Clarita's air quality reflects the Santa Clarita Valley's partial topographic enclosure between the Santa Susana Mountains to the south and the Sierra Pelona Mountains to the north, with vehicle emissions from I-5 and SR-14 the primary local sources. The valley's position at the northern edge of the Los Angeles basin means it receives the temperature inversion's pollution accumulation, while the Newhall Pass channels both pollution from the San Fernando Valley and occasional cleaner air from the Antelope Valley.
Today - 20 September | Pollution peaks at 10:00
AQI:
Moderate
43.5/100
PM2.5 (fine particles):
Fair
30.3/100
PM10 (coarse particles):
Moderate
43.5/100
NO2 (nitrogen dioxide):
Fair
26.5/100
O3 (ozone):
Fair
28.7/100
SO2 (sulfur dioxide):
Good
0.8/100
CO (carbon monoxide):
Good
0.4/100
HCHO (formaldehyde):
Good
1.5/100
PM1 (ultrafine particles):
Good
4.6/100
Levels show the poorest local air quality during the day
Tomorrow - 21 September | Pollution peaks at 03:00
AQI:
Moderate
50.1/100
PM2.5 (fine particles):
Fair
27.1/100
PM10 (coarse particles):
Moderate
41.9/100
NO2 (nitrogen dioxide):
Good
12.3/100
O3 (ozone):
Moderate
50.1/100
SO2 (sulfur dioxide):
Good
0.9/100
CO (carbon monoxide):
Good
0.5/100
HCHO (formaldehyde):
Good
2.1/100
PM1 (ultrafine particles):
Good
5.5/100
Pollen forecast in Santa Clarita
View pollen forecastAir quality forecasts for neighbourhoods and landmarks in Santa Clarita
Frequently Asked Questions
Is air quality bad in Santa Clarita right now?
On 20 September 2026, overall air quality in Santa Clarita is moderate. AQI is the main air quality indicator at 43.5/100. Pollution peaks around 10:00 AM (PM10: 43.5/100).
Will air quality be worse tomorrow in Santa Clarita?
On 21 September 2026, air quality conditions in Santa Clarita will be similar to today, with AQI forecast at moderate at 50.1/100. Pollution peaks around 3:00 AM (O3: 50.1/100).
When is air pollution at its worst in Santa Clarita?
Santa Clarita's air quality has a clear seasonal rhythm. In short, the cleanest air usually comes in winter, when storms periodically flush pollution out of the basin, whereas summer sunshine and heat drive some of the worst ozone readings in the country. The mountains ringing the basin can trap pollution close to the ground for days when winds are calm.
Are air quality levels in Santa Clarita 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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