Browse APIs

NEA PSI (Pollutant Standards Index)

Government

by NEA via data.gov.sg

Hourly PSI and pollutant concentration readings (PM2.5, PM10, SO2, CO, O3, NO2) for the five regions of Singapore. The go-to source during haze season.

How to authenticate

  1. 1No key needed; the endpoint is public.
  2. 2Optional: request a data.gov.sg API key for higher rate limits and send it as x-api-key.

Example request

Request
curl 'https://api-open.data.gov.sg/v2/real-time/api/psi'

Example response

Response (truncated)
{"code":0,"data":{"regionMetadata":[{"name":"central","labelLocation":{"longitude":103.82,"latitude":1.35735}}]}}

Notes for AI agents

v2 uses camelCase keys; v1 (api.data.gov.sg/v1/environment/psi) uses snake_case and still works. psi_twenty_four_hourly is the headline number people mean by PSI.

Machine-readable version: /api/apis/nea-psi

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