Pollutant Standards Index
- Pollutant Standards Index
The Pollutant Standards Index, or PSI, provides a uniform system of measuring pollution levels for the major air pollutants. It is based on a scale devised by the United States Environmental Protection Agency (USEPA) to provide a way for broadcasts and newspapers to report air quality on a daily basis.
The PSI is reported as a number on a scale of 0 to 500 and is the air quality indicator. These index figures enable the public to determine whether the air pollution levels in a particular location are good, unhealthy, hazardous or worse. The PSI is used in a number of countries including the United States and Singapore. However, since 1999, the United States EPA has replaced the Pollution Standards Index (PSI) with the Air Quality Index (AQI) to incorporate new PM2.5 and ozone standards.
PSI in Singapore
The highest PSI reading on record in Singapore is 226 in September 1997. [ [http://www.channelnewsasia.com/stories/singaporelocalnews/view/234346/1/.html "Haze worsens in Singapore, PSI reading hits 126"] , Daniel Tan, Channel NewsAsia, 07 October 2006] The PSI chart below is grouped by index values and descriptors, according to the National Environment Agency. [http://app.nea.gov.sg/cms/htdocs/article.asp?pid=1251]
Note: This chart reflects those shown in Singapore and may differ for other countries.
ee also
*Haze
*Air Quality Index
*Air Pollution Index
*2006 Southeast Asian haze
*1997 Southeast Asian haze
References
External links
* [http://app.nea.gov.sg/cms/htdocs/article.asp?pid=1253 FAQ on the haze]
* [http://app.nea.gov.sg/psi/ 24-hourly PSI readings in Singapore]
Wikimedia Foundation.
2010.
Look at other dictionaries:
Air Quality Index — The Air Quality Index (AQI) is a standardized indicator of the air quality in a given location. It measures mainly ground level ozone and particulates (except the pollen count), but may also include sulfur dioxide, and nitrogen dioxide. Various… … Wikipedia
Air Pollution Index — The Air Pollution Index (API) is a simple and generalized way to describe the air quality in mainland China, Hong Kong and Malaysia. It is calculated from several sets of air pollution data.Mainland ChinaChina s State Environment Protection… … Wikipedia
National Ambient Air Quality Standards — Counties in the United States where one or more National Ambient Air Quality Standards are not met, as of June 2007. The National Ambient Air Quality Standards (NAAQS) are standards established by the United States Environmental Protection Agency … Wikipedia
Smog — is a kind of air pollution; the word smog is a portmanteau of smoke and fog. Classic smog results from large amounts of coal burning in an area caused by a mixture of smoke and sulfur dioxide. Modern smog does not usually come from coal but from… … Wikipedia
Not-To-Exceed (NTE) — This article deals with an emissions standard for Heavy Duty Diesel Engines which was created by the United States Environmental Protection Agency. The Not To Exceed (NTE) standard recently promulgated by the United States Environmental… … Wikipedia
Not-To-Exceed — The Not To Exceed (NTE) standard recently promulgated by the United States Environmental Protection Agency (EPA) ensures that heavy duty engine emissions are controlled over the full range of speed and load combinations commonly experienced in… … Wikipedia
1997 Southeast Asian haze — The 1997 Southeast Asian haze was a large scale air quality disaster which occurred during the second half of 1997, its after effects causing widespread atmospheric visibility and health problems within Southeast Asia. The total costs of the… … Wikipedia
2006 Southeast Asian haze — The 2006 Southeast Asian haze event was caused by continued uncontrolled burning from slash and burn cultivation in Indonesia, and affected several countries in the Southeast Asian region and beyond, such as Malaysia, Singapore, southern Thailand … Wikipedia
Portable Emissions Measurement System — A Portable Emissions Measurement System (PEMS) is essentially a lightweight ‘laboratory’ that is used to test and/or assess mobile source emissions (i.e. cars, trucks, buses, construction equipment, generators, trains, cranes, etc.) for the… … Wikipedia
Environmental Protection UK — is a UK environmental Non Governmental Organization (NGO) working in the fields of air quality, noise and land quality. It was formally known as the National Society for Clean Air and Environmental Protection (NSCA), changing its name as part of… … Wikipedia
