Worst air pollution Hawthorne, today and tomorrow
Today (20 September): Air quality in Hawthorne is moderate. AQI and PM10 are moderate; PM2.5 is fair; NO2, O3, SO2, CO, HCHO, and PM1 are good. Pollution peaks around 9:00 AM (PM10: 42.1/100).
Tomorrow (21 September 2026): Air quality in Hawthorne is fair. AQI improves to fair; PM10 decreases to fair; O3 increases to fair; 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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Hawthorne's air quality reflects the South Bay's position in the Los Angeles basin adjacent to Los Angeles International Airport, with concentrated aviation and ground vehicle emissions generating elevated NOₓ and ultrafine particles alongside vehicle traffic on I-105 and I-405. The coastal proximity provides some Pacific afternoon ventilation, while the basin inversion continues to affect all of the South Bay throughout the year.
Today - 20 September | Pollution peaks at 09:00
AQI:
Moderate
42.1/100
PM2.5 (fine particles):
Fair
28.9/100
PM10 (coarse particles):
Moderate
42.1/100
NO2 (nitrogen dioxide):
Good
17.2/100
O3 (ozone):
Good
19.8/100
SO2 (sulfur dioxide):
Good
0.3/100
CO (carbon monoxide):
Good
0.4/100
HCHO (formaldehyde):
Good
1.1/100
PM1 (ultrafine particles):
Good
3.2/100
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
25.3/100
PM10 (coarse particles):
Fair
29.6/100
NO2 (nitrogen dioxide):
Good
13.0/100
O3 (ozone):
Fair
24.6/100
SO2 (sulfur dioxide):
Good
0.7/100
CO (carbon monoxide):
Good
0.5/100
HCHO (formaldehyde):
Good
1.9/100
PM1 (ultrafine particles):
Good
4.6/100
Pollen forecast in Hawthorne
View pollen forecastAir quality forecasts for neighbourhoods and landmarks in Hawthorne
Frequently Asked Questions
Is air quality bad in Hawthorne right now?
On 20 September 2026, overall air quality in Hawthorne 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 Hawthorne?
On 21 September 2026, air quality conditions in Hawthorne 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 Hawthorne?
Conditions in Hawthorne vary noticeably across the seasons — winter typically brings the cleanest stretch, once occasional rain clears the basin, whereas summer and early autumn bring the highest ozone levels, and wildfire smoke can spike particulate readings sharply from August through October. The mountains ringing the basin can trap pollution close to the ground for days when winds are calm.
Are air quality levels in Hawthorne 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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