PSI band + advisory API

Maps a 0-500 Pollutant Standards Index value to its Singapore NEA band and 24h health advisory. Answers 'What does PSI 150 mean?', 'What activity advice goes with this PSI?'.

Price$0.02per request

MethodPOST

Route/v1/climate/psi-category

StatusLive

MIME typeapplication/json

Rate limit120/minute

Cache0s public

psipollutant-standards-indexair-qualitysingaporepollutionadvisoryhealthband

API URLhttps://x402.hexl.dev/v1/climate/psi-category

Integration docs

Example request

{
  "psi": 150
}

Example response

{
  "psi": 150,
  "band": "Unhealthy",
  "advisory": "Reduce prolonged outdoor exertion; sensitive groups stay indoors.",
  "interpretation": "PSI 150 — Unhealthy.",
  "formula": "Singapore NEA PSI 24h bands: 0-50 Good, 51-100 Moderate, 101-200 Unhealthy, 201-300 Very Unhealthy, 301+ Hazardous"
}

Input schema

{
  "type": "object",
  "required": [
    "psi"
  ],
  "properties": {
    "psi": {
      "type": "number",
      "description": "PSI value 0-500",
      "examples": [
        150
      ]
    }
  }
}

Output schema

{
  "type": "object",
  "additionalProperties": true
}