What does PM15 stand for?

Particulate Matter of 15 Microns in diameter or smaller (also seen as PM-15)

This definition appears very rarely and is found in the following Acronym Finder categories:

Other Resources:

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Bureau of Political-Military Affairs Office of Regional Security and Arms Transfer Production Management System Program Manager Saudi Arabia National Guard Paper Mario: The Thousand-Year Door (game) Past Masters Volume 1 (Beatles compilation album) Patternmaker First Class (Naval Rating) Postpartum Months 1 Precursor Marker 1 (antibodies) Particulate Matter of 10 Microns in diameter or smaller (also seen as PM-10) Particulate Matter 100 Microm in Aerodynamic Diameter		Paper Mario 2 (gamcube game) Past Masters Volume 2 (Beatles compilation album) Patternmaker Second Class (Naval Rating) Professional Materials Management (Tampa, FL) Particulate Matter less than 2.5 microns in diameter Patternmaker Third Class (Naval Rating) Persistent Modula-3 (programming language) Project Management Maturity Model (also seen as PMMM) Protocerebral Medulla 4 Process Management for Highly Dynamic and Pervasive Scenarios