Abstract: An air sampler which has an air impeller mounted within a cyclonic cup housing. A thin film of stripping liquid and/or fog of stripping liquid particles within the sampler strip target material from the air flowing through it. The inner surfaces of the sampler may be selected to be hydrophilic, for better flow of the thin film of stripping liquid across them. The stripping target material concentration in it. The sampler may be so small, light and low in energy consumption that it may be battery powered and human-portable; and may be so efficient that it may be used to strip target material that is present in the incoming air in concentrations of only a few parts per trillion, or less.