With the release of the new InvisiClean Claro and Sensa Air Purifiers, one of the common questions we get is what is PM2.5. Simply put, it is a measurement of PM (Particulate Matter) in the air that is smaller than 2.5 micrometers. Human hair is about 75 micrometers in diameter, so even the largest PM2.5 particle is 30 times smaller...
