Personal Impactors PM₁₀, PM₄ and PM_2.5

The Mesa Personal Impactor is a development of the Environmental Science and Engineering Group at the Harvard School of Public Health. It is a group of four impactors designed to be worn on the person in order to closely gauge their exposure to PM₁₀ PM₄ or PM_2.5 concentrations at two different flow rates. This design eliminates the bias found when particles impact dry surfaces.