Tiny PM2.5 particles, which measure 2.5 microns in diameter, are 30 times smaller than a strand of hair and capable of entering the human bloodstream. Since October 5, Singapore has experienced its longest stretch of unhealthy air quality, with PSI levels consistently recording readings above 101. On October 14 at 9am, the western region reached 144, while northern Singapore saw levels at 106. Central and eastern areas recorded 142 and 139 respectively.
Understanding how to manage indoor air is critical as health experts warn that common home air-conditioners do not effectively filter these fine pollutants. While cooling a room, standard air-conditioner units are designed for dust rather than haze particles. According to Rajasekhar Balasubramanian of NUS, upgrading filters to MERV 13 or higher is required to improve efficiency, or alternatively, utilizing an air purifier equipped with a HEPA filter in an enclosed space.
National Environment Agency reports indicate that PM2.5 concentrations remain in the elevated band across all five regions. Central Singapore recorded the highest concentration at 98, followed by 83 in southern Singapore. Authorities previously warned that if dry conditions persist across Sumatra and Kalimantan, smoke haze may continue to drift toward the city-state.
While the 24-hour PSI forecast is expected to stay in the unhealthy range, there is a possibility for some relief. The National Environment Agency has forecast thundery showers in the afternoon, particularly across the northern, western, and central parts of Singapore, which may provide temporary reprieve from the current conditions.