Singapore’s air quality has substantially improved, returning to the good-to-moderate range after 18 days of unhealthy conditions caused by haze. As of October 22, the 24-hour Pollutant Standards Index (PSI) ranged from 71 to 99 across the island, a development that allows residents to resume normal outdoor activities.
The western region of Singapore was the last to exit the unhealthy air quality category, with its PSI dropping from 101 to 99. This marks an end to a period that began on October 5, when air quality first exceeded the unhealthy threshold of 101.
Throughout the island, fine particulate matter, known as PM2.5, was recorded within the normal range. At 3 p.m., the one-hour PM2.5 readings were between 16 and 39 micrograms per cubic meter, indicating a notable improvement in air quality.
Despite the positive change in Singapore, the haze remains a concern in the region. Satellite data continue to show hotspots in Indonesia, though prevailing winds have directed much of the smoke away from Singapore. However, areas such as Peninsular Malaysia, Kalimantan, Sumatra, and western Sarawak have experienced greater levels of pollution.