How does sampling in high humidity affect the readings obtained from the DUSTTRAK?
Relative humidity higher than 80 percent can cause particle concentration readings to be biased high from the actual concentration of dry particles. The amount that an aerosol’s mass concentration increases due to water absorption is a complex function of the particle’s material and the atmosphere’s absolute humidity (i.e. specific humidity). This humidity effect can bias the DUSTTRAK’s readings up to 60 percent high in the most extreme conditions of high temperature and high relative humidity.
