Abstract: The present disclosure provides method and apparatus for detection of airborne particulates. Liquid droplets comprising reagents capable of reacting with particulates whereby to produce emitted light are introduced to an air flow comprising particulates, whereupon the particulates and liquid droplets agglomerate thereby producing the emitted light. The light is detected by a suitable detector (7), and agglomeration may be enhanced by application of an oscillating electric field (6). The disclosure is particularly concerned with detection of biological particulates.

Abstract: A powder charging and delivery device which comprises a receptacle having a neck portion, the receptacle containing particles of a material which can be electrostatically charged and the receptacle having a reticulated, open pore, foam material disposed within the neck thereof, whereby as the particles are dispensed from the container they travel through the pores of the reticulated foam material and thereby become electrostatically charged.