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• AQI translates pollution measurements into a health-related index. This site estimates a PM2.5-only US AQI from NEA readings using the US EPA NowCast method and current breakpoints.
• Singapore’s PSI tracks six pollutants, including PM2.5. The 24-hour PSI shown here is supplied by NEA.

• Matching categories are not equivalent readings: AQI and PSI use different methods and time windows.
• Sensitive Groups applies only to AQI.
• For activity advice, use NEA’s PM2.5 guide below.

US EPA Method (May 2026 guidance)

• Up to 12 hourly readings, with more weight on recent hours when levels change; at least two of the latest three are required.
• This PM2.5-only estimate is not an official Singapore AQI.

NEA PSI Advisory

PM2.5 means fine inhalable particles generally 2.5 micrometres or smaller. It is the dominant pollutant during transboundary haze in Singapore.

The middle reading is NEA’s 1-hour PM2.5 concentration in µg/m³. It is a concentration, not an AQI or PSI score.

NEA guidance based on 1-hour PM2.5:

NEA’s PM2.5 activity guide

• Singapore haze readings and advisories
• NEA’s PM2.5 and PSI guide
• Understanding 1-hour PM2.5

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