The invention is an improved impinger for collecting airborne nano- and micron- particles, and is particularly suitable for sampling biological particles (bioaerosols include viruses, bacteria, fungi, and their spores). The collection efficiency of the commercially available impinger for airborne nanoparticles is only around 20-30%, but the collection efficiency of the present invention is as high as 98%.

The mechanism of capturing particles for commercially available impingers is mainly centrifugal force, inertial force, or physical interception. In addition to inertial force and the physical interception, the mechanism of capturing particles in the present invention also utilizes the Brownian motion of nanoparticles to enhance their collection efficiency for nanoparticles. Compared with the collection efficiency for airborne nanoparticles in currently commercially available impingers (around 10%), the collection efficiency of the present invention is as high as 98%.

Air sampling of airborne pathogens in medical institutions, process environmental sampling in the biotechnology industry, and environmental sampling in places where airborne pathogens are concerned.