Measurement & Analytical Methods

PM2.5 – Filterable & Condensable PM

Recent NCASI technical studies focus on several topics related to PM2.5 measurement; in-field implementation of Method 201A for filterable PM2.5, biases in Method 202 used to measure CPM and development of a method to measure filterable PM2.5 from sources with entrained water droplets. NCASI work on Method 202 has extended EPA and industry understanding of method-related issues, resulted in the development of best practices for field implementation and also forms the basis for interim EPA guidance to compensate for bias.