Worst air pollution Tustin, today and tomorrow
Today (20 September): Air quality in Tustin is moderate. AQI and PM10 are moderate; PM2.5 is fair; NO2, O3, SO2, CO, HCHO, and PM1 are good. Pollution peaks around 10:00 AM (PM10: 43.1/100).
Tomorrow (21 September 2026): Air quality in Tustin is fair. AQI improves to fair; PM10 decreases to fair; all other pollutants stay as today. Pollution peaks around 2:00 AM (PM10: 35.1/100). 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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Tustin's air quality reflects the Orange County position in the Los Angeles basin, with vehicle emissions from SR-55 and I-5 the primary local sources. The basin inversion affects all of Orange County, while Pacific sea breezes provide better afternoon ventilation than the deeper San Fernando Valley and Tustin's position near the Santa Ana Mountains creates modest topographic variation that can concentrate local vehicle emissions under inversion conditions.
Today - 20 September | Pollution peaks at 10:00
AQI:
Moderate
43.1/100
PM2.5 (fine particles):
Fair
29.6/100
PM10 (coarse particles):
Moderate
43.1/100
NO2 (nitrogen dioxide):
Good
13.2/100
O3 (ozone):
Good
16.4/100
SO2 (sulfur dioxide):
Good
0.3/100
CO (carbon monoxide):
Good
0.4/100
HCHO (formaldehyde):
Good
1.1/100
PM1 (ultrafine particles):
Good
1.7/100
Levels show the poorest local air quality during the day
Tomorrow - 21 September | Pollution peaks at 02:00
AQI:
Fair
35.1/100
PM2.5 (fine particles):
Fair
25.2/100
PM10 (coarse particles):
Fair
35.1/100
NO2 (nitrogen dioxide):
Good
10.3/100
O3 (ozone):
Good
17.0/100
SO2 (sulfur dioxide):
Good
0.6/100
CO (carbon monoxide):
Good
0.5/100
HCHO (formaldehyde):
Good
1.5/100
PM1 (ultrafine particles):
Good
2.3/100
Pollen forecast in Tustin
View pollen forecastAir quality forecasts for neighbourhoods and landmarks in Tustin
Frequently Asked Questions
Is air quality bad in Tustin right now?
On 20 September 2026, overall air quality in Tustin is moderate. AQI is the main air quality indicator at 43.1/100. Pollution peaks around 10:00 AM (PM10: 43.1/100).
Will air quality be worse tomorrow in Tustin?
On 21 September 2026, air quality conditions in Tustin will be better than today, with AQI forecast at fair at 35.1/100. Pollution peaks around 2:00 AM (PM10: 35.1/100).
When is air pollution at its worst in Tustin?
Tustin's air quality follows a clear seasonal pattern: the cleanest air usually comes in winter, when storms periodically flush pollution out of the basin, but from August into October, wildfire smoke can add sharp particulate spikes on top of the usual summer ozone. Coastal breezes offer some relief compared to inland valley locations that see heavier smog buildup.
Are air quality levels in Tustin 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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