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THRESHOLD PLANNING QUANTITY (TPQ)

Quantity substance used in industry which triggers emergency planning and reporting requirements. A lower TPQ reflects a substance that is considered more hazardous. Applicable TPQs for specific substances are found in several sections of the regulations developed under the Emergency Planning and Community Right-to-Know Act. TPQs are also given for substances which are covered by the Act, but for which there is no substance-specific TPQ.


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