Worst air pollution Hayward, today and tomorrow
Today (9 August): Air quality in Hayward is fair. AQI and O3 are fair; PM2.5, PM10, NO2, SO2, CO, HCHO, and PM1 are good. Pollution peaks around 6:00 AM (O3: 30.1/100).
Tomorrow (10 August 2026): Air quality in Hayward is fair. All pollutants stay as today. Pollution peaks around 11:00 PM (O3: 34.8/100). Airmine updates local air quality forecasts four times daily.
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Hayward's air quality in California reflects the East Bay position at the base of the Diablo Range foothills, with the San Francisco Bay-Oakland Bridge and I-880 generating concentrated freight and commuter vehicle emissions alongside the Hayward shoreline's industrial waterfront operations. The Bay Delta breeze provides afternoon ventilation from the Carquinez Strait, while the Hayward Fault corridor and the surrounding East Bay hills create topographic variation, and summer wildfire smoke from the Diablo Range and East Bay Regional Parks is a recurring seasonal concern.
Today - 9 August | Pollution peaks at 06:00
AQI:
Fair
30.1/100
PM2.5 (fine particles):
Good
10.8/100
PM10 (coarse particles):
Good
4.1/100
NO2 (nitrogen dioxide):
Good
0.6/100
O3 (ozone):
Fair
30.1/100
SO2 (sulfur dioxide):
Good
0.4/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
1.8/100
PM1 (ultrafine particles):
Good
7.0/100
Levels show the poorest local air quality during the day
Tomorrow - 10 August | Pollution peaks at 23:00
AQI:
Fair
34.8/100
PM2.5 (fine particles):
Good
9.4/100
PM10 (coarse particles):
Good
4.3/100
NO2 (nitrogen dioxide):
Good
0.4/100
O3 (ozone):
Fair
34.8/100
SO2 (sulfur dioxide):
Good
0.4/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
2.0/100
PM1 (ultrafine particles):
Good
6.2/100
Pollen forecast in Hayward
View pollen forecastFrequently Asked Questions
Is air quality bad in Hayward right now?
On 9 August 2026, overall air quality in Hayward is fair. AQI is the main air quality indicator at 30.1/100. Pollution peaks around 6:00 AM (O3: 30.1/100).
Will air quality be worse tomorrow in Hayward?
On 10 August 2026, air quality conditions in Hayward will be similar to today, with AQI forecast at fair at 34.8/100. Pollution peaks around 11:00 PM (O3: 34.8/100).
When is air pollution at its worst in Hayward?
Hayward's air quality has a clear seasonal rhythm — 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 Hayward 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: 9 August 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.
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