Worst air pollution South Whittier - La Mirada, today and tomorrow
Today (20 September): Air quality in South Whittier is moderate. AQI and PM10 are moderate; PM2.5, NO2, and O3 are fair; SO2, CO, HCHO, and PM1 are good. Pollution peaks around 9:00 AM (PM10: 42.1/100).
Tomorrow (21 September 2026): Air quality in South Whittier is fair. AQI improves to fair; PM10 decreases to fair; NO2 decreases to good; all other pollutants stay as today. Pollution peaks around 8:00 AM (PM10: 29.6/100). 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 South Whittier, with vehicle traffic relatively low, dust from nearby fields and occasional burning are the bigger day-to-day factors. Trees and green space nearby provide a partial buffer, catching particulate matter before it spreads further. Local monitoring for the wider area tends to track closely with this general pattern.
Today - 20 September | Pollution peaks at 09:00
AQI:
Moderate
42.1/100
PM2.5 (fine particles):
Fair
27.9/100
PM10 (coarse particles):
Moderate
42.1/100
NO2 (nitrogen dioxide):
Fair
21.0/100
O3 (ozone):
Fair
20.5/100
SO2 (sulfur dioxide):
Good
0.3/100
CO (carbon monoxide):
Good
0.4/100
HCHO (formaldehyde):
Good
1.1/100
PM1 (ultrafine particles):
Good
2.3/100
Levels show the poorest local air quality during the day
Tomorrow - 21 September | Pollution peaks at 08:00
AQI:
Fair
29.6/100
PM2.5 (fine particles):
Fair
24.4/100
PM10 (coarse particles):
Fair
29.6/100
NO2 (nitrogen dioxide):
Good
16.1/100
O3 (ozone):
Fair
25.6/100
SO2 (sulfur dioxide):
Good
0.7/100
CO (carbon monoxide):
Good
0.5/100
HCHO (formaldehyde):
Good
1.9/100
PM1 (ultrafine particles):
Good
3.5/100
Other Landmarks in La Mirada
Frequently Asked Questions
Is air quality bad in South Whittier right now?
On 20 September 2026, overall air quality in South Whittier is moderate. AQI is the main air quality indicator at 42.1/100. Pollution peaks around 9:00 AM (PM10: 42.1/100).
Will air quality be worse tomorrow in South Whittier?
On 21 September 2026, air quality conditions in South Whittier will be better than today, with AQI forecast at fair at 29.6/100. Pollution peaks around 8:00 AM (PM10: 29.6/100).
When is air pollution at its worst in South Whittier?
From November to January, average wind speeds run around 11 km/h with temperatures near 14°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 24°C, warm enough for strong sun and heat to drive ground-level ozone formation.
Are air quality levels in South Whittier 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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