Pasadena has installed a professional-grade air quality sensor at the Pasadena Public Health Department (PPHD) as part of an effort to improve environmental monitoring. The initiative, led by the California Institute of Technology (Caltech), provides real-time data on airborne particulate matter, particularly PM10—dust and ash particles linked to respiratory health risks.
The new sensor, developed by QuantAQ, is part of the PHOENIX network, which includes over 25 sensors across Pasadena and Altadena. The network offers public access to hyper-local air quality data through an interactive online map.
The project was launched after wildfires destroyed previous monitoring stations, creating gaps in air quality data. Caltech began deploying the sensors in early 2025 to restore and enhance coverage.
PM10 particles, emitted by wildfires, traffic, and construction, can cause coughing, eye irritation, and breathing difficulties. Officials advise residents to check the PHOENIX map and limit outdoor activity during high pollution periods.
The program is set to run through at least fall 2026, with potential expansion based on data and funding. More information is available on Caltech’s Environmental Monitoring site and PPHD updates.
