Particulate Matter (PM) is present in every breath you take and it comes in a range of different sizes. Particulate Matter is measured in a range of different sizes with the most common from PM10 (10 micron Particles or less), PM2.5 (2.5 micron particles or less) or PM1 particles (1 Micron Particles). Our body has built in defenses against many of these particle sizes but some can penetrate deeper than others.
The PM1 particle is the size that penetrated deepest into the human body. Find out more about this particle in the video below