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The PSI has been used in a number of countries including the United States and Singapore. Since 1999, the US EPA has replaced the Pollution Standards Index (PSI) with the Air Quality Index (AQI) to incorporate new PM 2.5 and ozone standards. Prior to 1 April 2014, Singapore published the PSI and the 1-hour PM 2.5 reading separately.
The transboundary haze crisis in Singapore lasted for approximately 4 days from 20 October to 23 October 2010. [16] During this period, the overall 24-hour Pollutant Standard Index (PSI), recorded by the National Environment Agency (NEA) was mainly in the high-moderate range while the hourly PSI crept into the unhealthy range of 108. [17]
Satellite photograph of the haze above Borneo. The 2006 Southeast Asian haze was an air pollution event caused by continuous, uncontrolled burning from "slash and burn" cultivation in Indonesia, which affected several countries in the Southeast Asian region and beyond, including Malaysia, Singapore, southern Thailand, and as far away as Saipan; [1] the effects of the haze may have even spread ...
Singapore uses the Pollutant Standards Index to report on its air quality, [34] with details of the calculation similar but not identical to those used in Malaysia and Hong Kong. [35] The PSI chart below is grouped by index values and descriptors, according to the National Environment Agency .
The headquarters of the National Environment Agency, Singapore is located at Environment Building on Scotts Road. National Environment Agency (NEA) is a statutory board under the Ministry of Sustainability and the Environment of the Government of Singapore. The NEA is responsible for improving and sustaining a clean and green environment in ...
The National Environment Agency attributed this to "denser haze from the sea areas south of Singapore being blown in by the prevailing south-south=easterly winds". [104] Thunderstorms in the morning of 28 October 2015 brought respite from the haze when the PSI dropped from 61 to 26 at 9 a.m.
At 4pm on 14 September 2019, the 24-hour Pollutant Standards Index (PSI) entered the "unhealthy" range of above 100 for the first time since 2016, [32] starting from 103 in western Singapore. The PSI steadily climbed up [33] with all parts of Singapore registering "unhealthy" PSI readings at 1am the next day, peaking at 124 from 5am to 8am in ...
The graph plots the PSI readings released by NEA from 20 to 21 June 2013. At 12 p.m. on 21 June 2013, the readings reached a record-breaking level of 401, in the highest possible Hazardous range. Mild haze began to affect Singapore on 13 June, [106] before air quality worsened and remained in the Unhealthy range for a few days. [107]