Abstract: Provided is a device for detecting airborne particulate matter in aerosols, comprising: an air sampler to collect a sample of airborne particles suspended in air; an optical sensor; a controller; a fluidic apparatus to, under the control of the controller: capture, from the air sampler, and resuspend in a liquid medium, at least part of the airborne particles of the sample; and deliver the resuspended airborne particles to the optical sensor, which is configured to detect airborne particulate matter in the delivered airborne particles. Also provided is a method adapted to use the device of the invention, and to a computer program product adapted to implement the method of the invention.