Total Suspended particulate sampling is a federal reference method defined in 40 CFR 50, appendix B, appendix G , and appendix J. This method calls for the use of a high volume air sampler to collect particles with an aerodynamic diameter of approximately 30 µm or less. The design of the high volume air sampler allows TSP to be deposited evenly across the filter surface. These samplers are operated between 40-60 cfm over a constant sampling period, typically 24 hours. The Tisch family was instrumental in the design of the first high volume air sampler back in 1954 and Tisch Environmental is still recognized as an industry leader in high volume air sampling equipment.