GgoogleSG SciencePhysics first seen 17 h ago, last 10 h ago, peak #1

psi

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.

Why now: Singapore's air quality has turned unhealthy, prompting residents to check current PSI readings.

SingaporePollutant Standards IndexAsiaOne

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Evidence

• Haze in S’pore: Air quality worsens as PSI hits unhealthy range in central, eastern and western regions · Yahoo News Singapore
• Haze update Sept 26: Air quality turns unhealthy in central Singapore · AsiaOne
• Haze Situation Update (26 September 2026) · NEA.gov.sg

API: https://socialmediatrends-api.osmike.com/v1/trends/1403