Tisch Environmental PM Cyclones are particle fractionators that utilize a cyclonic effect to separate ambient particles.  Particles within the aerosol whose aerodynamic diameter is greater than PM2.5, PM₄ or PM₁ are collected in the collector cup and those particles within the aerosol that are less or equal to the designated aerodynamic diameter are passed onward through the downtube assembly.  Tisch Environmental PM cyclones are used in conjunction with a standard US EPA PM₁₀ inlet.  The cyclone is placed downstream of the PM₁₀ inlet to achieve PM particulate collection.  The cyclone is designed to be operated at a flowrate of 16.67 Liters per minute to achieve optimal PM collection.