According to the U.S. EPA, calibration is defined as the comparison of a measurement standard, instrument, or item with a standard or instrument of higher accuracy to detect and quantify inaccuracies and to report or eliminate those inaccuracies by adjustment.
Prior to the implementation of any ambient air monitoring activities, the sampling and analysis equipment must be checked to assure it is within calibration tolerances, and if it fails these tolerances, must be appropriately calibrated. This function is most routinely carried out at the field monitoring location.
Learn more about calibrations in this informative EPA handout.
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