Singapore experienced unhealthy air quality levels across all regions on the evening of September 29, marking the first time in two weeks that readings have reached such levels amid the ongoing haze season. At 9 p.m. on September 29, the Pollutant Standards Index (PSI) readings exceeded the unhealthy threshold of 101 in every region, with the central area recording the highest level at 145. Other regions registered PSI values of 136 in the west, 133 in the east, 113 in the south, and 105 in the north.

The 24-hour PSI, which offers a rolling average of six key air pollutants, saw a significant rise earlier that day. By 7 a.m., the central region’s reading climbed to 155, surpassing the previous peak of 154 noted on September 15. This increase continued, reaching 164 by 10 a.m., establishing a new high point since the PSI returned to unhealthy levels due to haze on September 4 — the first incidence of such readings since October 2023.

In addition to the 24-hour PSI, hourly PM2.5 measurements, which indicate fine particulate matter concentration and provide a more immediate assessment of air quality, also remained elevated. By 9 p.m. on September 29, all regions except the south recorded PM2.5 levels above the normal band. The south registered a reading of 52 micrograms per cubic meter, while other areas ranged between 60 and 77, indicating moderately high concentrations of fine particles. PM2.5 levels between 56 and 150 are characterized as elevated and pose potential health risks.

Residents expressed concerns on social media platforms, describing the visible smog and its effects. Some recounted refraining from opening windows due to the discomfort caused by the haze, while others highlighted physical symptoms such as a bitter taste in the air when ventilation was attempted. One user shared a photo from River Valley and voiced fears about the impact on students preparing for exams, emphasizing the community’s intention to respond to the worsening conditions.

The National Environment Agency (NEA) issued a haze advisory around 6:20 p.m. on September 29, forecasting air quality to remain in the high moderate to mid-unhealthy range over the following 24 hours. The agency attributed the haze to persistent dry conditions in southern Sumatra and parts of Kalimantan, which continue to contribute to increased smoke haze drifting towards Singapore. Although local showers were predicted for September 30, prevailing winds from the east or southeast are expected to maintain smoky conditions.

NEA urged the public, especially vulnerable groups such as the elderly, children, pregnant women, and individuals with chronic lung or heart conditions, to limit or avoid prolonged and strenuous outdoor activities during periods when PSI readings enter the unhealthy range. Healthy individuals were also advised to reduce such activities to mitigate potential health impacts associated with the haze.