Air quality in the central region of Singapore deteriorated into the unhealthy category late on September 9, with the 24-hour Pollutant Standards Index (PSI) climbing to 106 by 9 a.m. on September 10. While the central area experienced this decline, other parts of the nation, including the northern, southern, eastern, and western zones, maintained moderate air quality levels ranging from 75 to 86. The National Environment Agency monitors these figures to provide guidance for public outdoor planning. Officials suggest that residents consult the 1-hour PM2.5 concentration data for real-time assessments before engaging in immediate outdoor activities, as the 24-hour PSI is intended primarily for scheduling events for the following day.
Source : Mothership
Photo : Mothership
