All you ever wanted to know about Particulate Matter (PM) but were too afraid to ask.
PM stands for Particulate Matter.
This is the term for particles found in the air including dust, dirt, soot, and smoke. These particles can be suspended in the air for long periods of time.
Particulate Matter comes in a wide range of sizes, measured in micrometers or ‘microns’. Like inches, meters, and miles, a micron is a unit of measurement for distance, a very small distance. There are 1000 microns in one millimeter and about the same width of a hair on your head. Continue reading What Does PM Stand For?
