Culture & Entertainment · Singapore Bureau
Singapore's air quality deteriorates as PSI breaches unhealthy threshold
Air pollution levels in Singapore's central region have crossed into the unhealthy range, with the Pollutant Standards Index reaching 104 on the morning of September 4. The reading marks a significant decline in air quality across the island.
LSN Singapore ·
The 24-hour PSI measurement in central Singapore hit 104 at 9am on September 4, surpassing the 100-point threshold that designates air quality as unhealthy for the general population. This elevation in pollutant concentrations signals worsening atmospheric conditions that may persist throughout the day.
When the PSI enters the unhealthy range, vulnerable groups including children, the elderly, and individuals with respiratory or heart conditions face increased health risks from prolonged or heavy outdoor exertion. The National Environment Agency typically issues health advisories when readings reach such levels, recommending residents limit outdoor activities and use appropriate protective equipment if exposure is unavoidable.
The PSI is a composite indicator that measures concentrations of five key pollutants: particulate matter, nitrogen dioxide, sulphur dioxide, carbon monoxide, and ozone. Readings of 101-200 are classified as unhealthy, while anything above 300 is hazardous. Central Singapore has historically experienced the highest pollutant concentrations during haze episodes affecting the region.
Residents are advised to monitor official air quality updates from the National Environment Agency and take necessary precautions to minimise exposure to poor air quality conditions.