What does PSI stand for?

Pollution Standard Index

This definition appears very rarely and is found in the following Acronym Finder categories:

Science, medicine, engineering, etc.

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Samples in periodicals archive:

The new index, which will replace the Pollution Standard Index, adds a new category called ``unhealthful for sensitive groups'' which will fall between moderate and unhealthful smog levels.

RATING FOR AIR QUALITY ADDED

The smoggiest day was June 29, when ozone levels reached an 83 pollution standard index (PSI), the state standard.

GIFT FROM LA NINA: LESS SMOG; OZONE LEVELS LOWER DUE TO COOLER TEMPS