What is the air quality in Hayward CA?

Hayward CA, United States of America has an annual US AQI of 47 (Reasonable) and average PM2.5 of 9.3 µg/m³, ranking #583 of 5856 cities. Main pollutant: PM2.5.

What is the cleanest month in Hayward CA?

March is typically the cleanest month (AQI 39) and December the most polluted (AQI 59).

Where does Hayward CA's air quality data come from?

PM2.5: 1998–2024 (satellite). From satellite data, because no government monitor covers the city. Full sources are on the methodology page.

Hayward CA, United States of America — Air Quality & Clean City Guide 2026

Hayward CA Air Quality Data

Global rank	City	Continent	AQI	PM2.5
583	Hayward CA, United States of America	North America	AQI 47	PM2.5 9.3 µg/m³