Unit (Unit of reported main variable)
The unit of the reported main variable is determined by the component name. A list of all allowed combinations of component name and unit can be found here. For particle mass concentration data measured by online methods and particle mass concentration data measured by gravimetric filter sampling, the unit always needs to be ug/m3 (as ASCII version of μg/m³). The unit stated here doesn't rule out that the file contains auxiliary variables that are given in other units as specified in the respective column headers.