For those tasked with making decisions relative to reducing particulate air pollution there is a special challenge. The definitions and the goals keep changing. All these changes are documented in a number of McIlvaine publications and services. The confusion starts with the very basic definition of particulate. Small particles penetrate the lungs and are of greater concern than large particles. So a definition based on particle diameter (10 microns or 2.5 microns) is used. However, most particles are not spheres. The actual measurement is based on impaction which is a function of size, weight and shape. Needless to say, there is lots of room for confusion and poor decision making based on the definition variables. Another problem is … Click Here For Complete News Release Text
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