EPA Positive Matrix Factorization 3.0 (EPA PMF 3.0)
Receptor models provide scientific support for current ambient air quality standards and for implementation of those standards by identifying and quantifying contributions of various source types. EPA PMF is one of the receptor models being developed by ORD. The user provides a file of concentrations where each column contains a different species and each row contains a different time, typically an hour or a day. Then EPA PMF uses a constrained weighted least squares approach to decompose the file of concentrations into a set of profiles and times series of contributions for each of the profiles.
receptor modeling, air, pollution sources