SINGAPORE AIR QUALITY
Singapore air quality
Current readings and seven-day history.
PM₂.₅
CENTRALRegional readings
PM₂.₅ sub-indexTap a region to explore · Illustrative regions, not monitoring boundaries
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CONCENTRATION
Past week
Select a point to inspect that hour. Missing readings are gaps.
CALCULATION
How PSI is calculated
Average the concentration, convert it to a sub-index, then take the highest sub-index.
24-hour mean
Concentration to sub-index
The line changes slope at NEA’s breakpoints. Find your concentration on the bottom; read its PSI sub-index on the left.
NEXT-HOUR SCENARIO
Change the next hour’s PM₂.₅
The new reading replaces the oldest hour. Chart 01 and the conversion in 02 update together.
Simulation using the selected hour’s rounded samples; other pollutants are held fixed.
Pollutant sub-indices
The overall PSI is the highest sub-index at each hour. Select a pollutant to highlight its line.
DAILY REPLAY
Satellite, smoke and hotspots
Follows the history slider’s selected day. Smoke areas and hotspots are ASMC observations; the satellite background is NASA imagery. Clouds and satellite coverage can hide detections.
Why the numbers don’t always match
Hourly readings and published averages are rounded. Our reconstruction uses the public hourly samples, so it can differ from NEA’s published 24-hour concentration. Official readings always stay separate.
One-hour bands are a different scale
PM₂.₅’s hourly concentration bands are Normal (0–55), Elevated (56–150), High (151–250), and Very high (251+ µg/m³). Don’t read them as PSI bands. For health advice, check NEA’s latest guidance ↗.