Worst air pollution Hayward, today and tomorrow
Today (15 July): 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 8:00 AM (O3: 39.4/100).
Tomorrow (16 July 2026): Air quality in Hayward is medium. AQI improves to medium; O3 decreases to medium; all other pollutants stay as today. Pollution peaks around 10:00 AM (O3: 41.0/100). 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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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 - 15 July | Pollution peaks at 08:00
AQI:
Fair
39.4/100
PM2.5 (fine particles):
Good
12.0/100
PM10 (coarse particles):
Good
7.4/100
NO2 (nitrogen dioxide):
Good
1.2/100
O3 (ozone):
Fair
39.4/100
SO2 (sulfur dioxide):
Good
0.5/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
2.2/100
PM1 (ultrafine particles):
Good
6.6/100
Levels show the poorest local air quality during the day
Tomorrow - 16 July | Pollution peaks at 10:00
AQI:
Medium
41.0/100
PM2.5 (fine particles):
Good
16.7/100
PM10 (coarse particles):
Good
8.1/100
NO2 (nitrogen dioxide):
Good
2.7/100
O3 (ozone):
Medium
41.0/100
SO2 (sulfur dioxide):
Good
0.5/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
1.9/100
PM1 (ultrafine particles):
Good
11.0/100
Pollen forecast in Hayward
View pollen forecastFrequently Asked Questions
Is air quality bad in Hayward right now?
On 15 July 2026, overall air quality in Hayward is fair. AQI is the main air quality indicator at 39.4/100. Pollution peaks around 8:00 AM (O3: 39.4/100).
Will air quality be worse tomorrow in Hayward?
On 16 July 2026, air quality conditions in Hayward will be better than today, with AQI forecast at medium at 41.0/100. Pollution peaks around 10:00 AM (O3: 41.0/100).
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.
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Data provided by Airmine — Last update: 16 July 2026 at 10:33 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.
For long term forecasts and maps, see the Airmine app