Air Quality Index (AQI), #512

Air Quality Index (AQI) Values Levels of Health Concern Colors 101 to 150 Unhealthy for Sensitive Groups Orange 151 to 200 Unhealthy Red 201 to 300 Very Unhealthy Purple 301 to 500 Hazardous Maroon
Additionally, how bad is the air quality right now? Air Quality Scale

AQI Air Pollution Level 0 - 50 Good 51 -100 Moderate 101-150 Unhealthy for Sensitive Groups 151-200 Unhealthy
Likewise, what causes bad air quality in California?

The combination of three main factors are the cause of notable unhealthy levels of air pollution in California: the activities of over 39 million people, a mountainous terrain that traps pollution, and a warm climate that helps form ozone and other pollutants.

What is the current air quality in San Jose California?

San Jose - Jackson St, Santa Clara, California Air Pollution: Real-time Air Quality Index (AQI)

Current Max PM2.5 AQI 5 38 PM10 AQI - 18 O3 AQI 25 29 NO2 AQI 3 19