Personal Exposome Tracker (PET) is a compact device that monitors the airborne exposome. PET reports in real-time particulate matter concentrations, air quality index, humidity, and temperature. What sets PET apart from other air quality sensors is that PET is capable of collecting both biological (e.g. fungi, bacteria, viruses) and chemical (e.g. plastics, paints, pesticides) exposures. Coupled with our patented detection workflow, PET provides the most detailed exposure information at the personal level. The miniature PET can be worn on the user or placed in a fixed location if needed.