Pollutant Standards Index

The Pollutant Standards Index, or PSI, is a type of air quality index, which is a number used to indicate the level of pollutants in air.

Initially PSI was based on five air pollutants, but since 1 April 2014 it has also included fine particulate matter (PM_2.5).

单词	Pollutant Standard Index
释义	Pollutant Standard Index 英语百科 Pollutant Standards Index The Pollutant Standards Index, or PSI, is a type of air quality index, which is a number used to indicate the level of pollutants in air. Initially PSI was based on five air pollutants, but since 1 April 2014 it has also included fine particulate matter (PM_2.5).
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Pollutant Standard Index