Is it better to report no data or null value coded data?
It is better to report null data codes (i.e., codes that explain common reasons why some data values are missing) for data values because it documents why specific values are missing which can assist the agency, EPA and others in evaluating and interpreting the data. Using null data codes might also help agencies identify changes that can be made to reduce lost data. (Also, some Regional Offices may require that null data codes be reported). In the event that a monitor will be out of service for an extended period (e.g., several months), it is probably better for the agency to enter sampling end dates in AQS and then reopen the monitor when the monitor begins to operate again (though it is up to the agency to decide what to do in this situation).
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