San Francisco Air Quality Sensors

Testing two dozen Purple Air Sensors at our lab in the Excelsior.

About the Sensors

Purple Air II

Purple Air II sensors are compact, low-cost sensors which measure particulate matter. We have calibrated these small sensors by co-location with an eBAM, an EPA- caliber sensor, prior to being deployed throughout the Eastern Neighborhoods. See


APIS-AQ sensors measure criteria pollutants. See