24-hour PSI by region: NEA via data.gov.sg (Singapore Open Data Licence). Region shapes group URA Master Plan 2019 planning areas; NEA publishes readings, not boundaries.
24-hour PSI in Singapore at 1:00 pm: North 135 (unhealthy), South 153 (unhealthy), East 173 (unhealthy), West 181 (unhealthy), Central 185 (unhealthy). Highest in the Central, and rising. 1-hour PM2.5 up to 242 µg/m³ (West).
The Pollutant Standards Index (PSI) is NEA's measure of air quality, reported for five regions of Singapore and updated every hour. Window shows the 24-hour PSI on the map, the last 24 hours for each region, and the 1-hour PM2.5, which shows the air in the last hour and is the better guide to what to do right now.
Older people, children, pregnant women and anyone with heart or lung conditions should take more care. For official health advice, follow NEA and MOH.
Window can alert you on Telegram when the haze turns unhealthy, very unhealthy or hazardous, and when it clears: @WindowSingaporeBot. See where today's smoke comes from on the haze page.