Under Singapore's Environmental Protection and Management (Control of Noise at Construction Sites) Regulations, Second Schedule, the 12 hours equivalent continuous noise level(LEQ12hrs) maximum permissible noise level for construction sites are set based on a start time of 7am and end time of 7pm for the DAY period. And from 7pm to 7am for the NIGHT period.
In order to know the 12hr Leq, a 12-hr measurement time would have to performed.
The "Current ongoing 12hr Leq" for DAY period, attempts to provide reader or user with a Leq value that is started since 7am, and is updated to the most current Leq5 minutes.
Example 1: If the "current ongoing 12hr Leq" value is being read at 3:04pm, then the Leq value is for measurement duration from 7:00am to 3:00pm.
This value provide a gauge on 'how much' noise has been measured since 7am, so as to estimate if the maximum permissible noise level for LEQ12hrs would be met.
For more details on NEA"s EPM regulations, kindly visit http://statutes.agc.gov.sg/ and seach for control of noise at construction sites.
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