Pollutant Standards Index
Index to describe air quality / From Wikipedia, the free encyclopedia
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The Pollutant Standards Index (PSI) is a type of air quality index used in Singapore, 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 (PM2.5).
In addition to the PSI derived by averaging data collected for the past 24 hours, Singapore also publishes 1-hr PM2.5 concentrations are also published every hour.[1]
Besides Singapore, some other countries also use air quality indices. However, the calculations used to derive their air quality indices may differ.[2] Different countries also use different names for their indices such as Air Quality Health Index, Air Pollution Index and Pollutant Standards Index.