Knowledge. Background Information: PSI and PM2.5 Readings 8 PSI is an index developed by the United States Environmental Protection Agency (USEPA) to provide accurate, timely and easily understandable information about daily levels of air pollution. Air pollutants such as sulphur dioxide, nitrogen dioxide, ozone, carbon monoxide and particulate matter 10 (PM10) are used in the determination of the index. The figure is derived by averaging data collected for the past 24 hours. Computation of the PSI can be found here: app2.nea.gov.sg/docs/default-source/default-document-library/computation-of-psi.pdf?sfvrsn=0. 9 The figure for the 3-hour PSI is derived by averaging data collected for the past three hours. This index is unique to Singapore and was introduced in 1997 to provide additional air quality information which would better reflect a more current air quality situation. 10 The PSI readings and health advisories for the five regions in Singapore (North, South, East, West and Central), which are updated at 8am, 12 noon and 4pm are available at the PSI page. The public can also access PSI updates through the following channels: Weather@SG website NEA Twitter NEA Call Centre at 1800 CALL NEA (1800 2255 632) NEA myENV App on iPhone and Android - See more at: app2.nea.gov.sg/corporate-functions/newsroom/news-releases/singapore-government-agencies-coordinate-effort-to-mitigate-haze-impact-on-public#sthash.2Tl241g8.dpuf
Posted on: Thu, 20 Jun 2013 03:53:43 +0000
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