Update of PM2.5 Data From T640/T640X PM Mass Monitors
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Issuing agencies
Abstract
The Environmental Protection Agency (EPA) is retroactively applying the approved modification of the Federal Equivalent Method (FEM) designation for the Teledyne Advanced Pollution Instrumentation Model T640 particulate matter (PM) mass monitor including the 640X option (hereafter T640 and T640X) to all of the concentration data for PM with a diameter 2.5 micrometers or smaller (PM<INF>2.5</INF>) from the T640 and T640X monitors in the EPA's Air Quality System (AQS) that was reported prior to the modification. The EPA processed the unmodified hourly PM<INF>2.5</INF> concentration data in AQS using collocated or paired ambient temperature when available.
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