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Updates to the PAC Data Set

A major revision of the PAC data set will generally be released every year or two to accommodate the addition of a new set of chemicals or to update existing TEEL values (i.e., a multi-year effort is underway to review and update, as warranted, all TEEL values). Minor revisions to the PAC data set (as indicated by the addition of a letter after the revision number) will be released to incorporate updated AEGL and ERPG data or to correct small errors in the data set.

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).