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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]
This 3-hour PSI 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. [3] In 2016, the 3-hour PSI was phased out on the grounds that the 1-hour PM 2.5 reading was a better indicator of the current air quality.
The 24-hour PSI on 20 October also reached the unhealthy range at 102. [28] Later in October, though, the situation began to improve, with the PSI hitting a low of 11 at 2 p.m. on 26 October. However, in early November, intermonsoonal winds brought slight haze back to Singapore, with the 3-hour PSI in the moderate range most of the time.
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 ]
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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.
3. General follow-up reporting . When a death occurs, it's important to file a public records request to obtain the investigative and autopsy reports when they are complete. Sometimes, news outlets do not follow up after the death is announced, which means little is known about the results of the internal investigation.