This page archives several key aerosol measurement instruments developed by Dr. Dale Lundgren throughout his distinguished career. At present, we highlight two groundbreaking instruments that have shaped the way we understand airborne particles.

The Lundgren Rotating-Drum Impactor (1967)

The Lundgren Rotating-Drum Impactor was one of the first tools to measure how airborne particles change in size and concentration over time. With its innovative rotating drum collection surface, it gave scientists a powerful new way to monitor particle exposures, laying the foundation for modern aerosol sampling.

Lundgren Impactor
Lundgren Rotating Drum Impactor photographed in the laboratory 

The In-Stack Low-Pressure Impactor (LPI) (1990)

Two decades later, Dr. Lundgren developed the in-stack low-pressure impactor (LPI), taking wide-range aerosol sizing into the stack. Designed to operate in a stack, it preserved the true nature of industrial emissions without the need for dilution or transport. This leap in sampling technology transformed how we monitor real-world emissions, which helps provide background to consider new standards for environmental and occupational health.

In Stack Low Pressure Impactor with five stages visable
In-Stack Low-Pressure Impactor with five stages exposed