Pollutant Standards Index

Air quality in Singapore has deteriorated, with the Pollutant Standards Index staying in the unhealthy range in the central region. Residents are tracking PSI readings closely as haze conditions persist, raising concerns about outdoor activities and health precautions, particularly for children, the elderly and those with respiratory conditions.

PSI, the Pollutant Standards Index, is Singapore's official air-quality measure, and searches for it have surged. A haze update from AsiaOne reports that air quality in central Singapore has turned unhealthy, which fits the pattern of people checking the index to see whether it is safe to go outside, exercise, or send children to school. Singapore experiences seasonal haze, often linked to forest fires in neighbouring Indonesia, so the term typically spikes whenever readings deteriorate.