Abstract: One variation of a method includes: accessing a timeseries of aerosol particle concentrations captured via a set of sensors arranged within an indoor environment during execution of an air test and following dispensation of a tracer load; based on the timeseries of aerosol particle concentrations, deriving a clean air-delivery rate for the indoor environment; accessing a set of building data defined for the indoor environment; estimating an outdoor air-delivery rate for the indoor environment based on the clean air-delivery rate and the set of building data; in response to the outdoor air-delivery rate exceeding a target outdoor air-delivery rate, interpreting a pass outcome for the air test and calculating a set of environmental controls for implementation at an environmental control system within the indoor environment, the set of environmental controls predicted to drive the outdoor air-delivery rate toward the target outdoor air-delivery rate by reducing the outdoor air-delivery rate.