Apparatus and associated methods relate to the determination of local environmental air quality by processing data from a local device sensing a user's respiration-vocalization. In an illustrative example, respiration-vocalization for a CPAP user may be sensed by an airflow and/or air pressure sensor. Respiratory disturbance events, such as coughing, for example, may be detected. The sensed events, converted to respiration-vocalization data, may be collected to estimate the environmental air quality and/or particle density around the user. Some examples may estimate specific allergen concentrations by correlating user respiration-vocalization data with the respiration-vocalization data from users/patients with known airborne particle sensitivities. In some embodiments, regional environmental air quality data may be compared with respiration-vocalization data to produce local environmental air quality results. Various results may advantageously indicate specific allergen conditions in an area based on monitoring of a population of users of CPAP machines or other devices in widespread use.