ABSTRACT
Allowable levels of particulate emissions are specified in several different ways, having somewhat different methodologies of measurement and different philosophies of important criteria for control. Permissible emission rates are in a state of great legislative flux both as to the definition of the suitable measurement and to the actual amount to be allowed. This section summarizes the various types of quantitative standards that are used in regulating particulate emissions. For a detailed survey of standards, the reader should consult works by Stern, 1 Greenwood et al. , 2 and the Public Health Service. 3
A recent National Research Council report proposes future studies on the nature of particulate emissions, their effect on exposed populations and their control 4 . Friedrich and Reis 5 have reported the results of a 10-year multinational European study on characteristics, ambient concentrations and sources of air pollutants.
