A persistent haze continues to affect Singapore, with air quality in the western part of the island remaining at “very unhealthy” levels overnight. As of 6am today, one-hour PM2.5 readings across much of Singapore were in the elevated range, indicating continued pollution. The National Environment Agency has not released a 24-hour PSI reading yet. Residents, particularly those in western Singapore, are advised to reduce prolonged or strenuous outdoor activities. Vulnerable groups, including the elderly, children, and those with pre-existing heart or lung conditions, are especially cautioned. The haze is believed to be caused by hotspots in Sumatra, Indonesia, with smoke blown in by prevailing winds. Authorities are monitoring the situation closely and are prepared to take necessary measures.