Does AQS automatically change data less than the MDL to 1/2 MDL?
The raw data file contains two raw data fields: reported raw data value and value in standard units. The raw data value as reported is stored in the first field. The data value in standard units is computed from the reported value, a conversion factor using the gas laws, and the minimum detection value. Any reported value below the minimum detection value is replaced with 1/2 the minimum detection value.