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Updates to the PAC Data Set

Since its inception, a major revision of the PAC data set has on average been released every year or two to accommodate the addition of a new set of chemicals or to update the existing TEEL values.  Minor revisions to the PAC data set (as indicated by the addition of a letter after the revision number) have been released to incorporate updated AEGL and ERPG data or to correct small errors in the dataset. 

Substantial changes to the PAC data set or important technical notes that may be useful for the emergency management community are published as Emergency Management Updates (EMUs).