The Quantitative Aerosol Generator (QAG) creates an aerosol of known concentration by nebulizing a solution. The resulting droplets are carried out of generation area to a drying chamber where they are dried to salt particles. Depending on the application for the salt particles the size can be varied to a number mean between 0.1 and 2 \u00b5m in diameter. The aerosol exiting the drying chamber contains a known concentration of analytes that is calculated from the QAG\u2019s input parameters. This reference aerosol produced by the QAG is process traceable to NIST (National Institute for Science and Technology) standards and can be used to challenge and evaluate the accuracy, precision, and linearity of measurement methods such as the Xact\u00ae series monitors during certification and RATA.<\/p>\n