Pollen API

Pollen API concept

Deliver hourly, species-level pollen at any coordinate worldwide with a 4-day forecast. Power allergy-aware alerts, planning tools, and lightweight widgets with a simple web API.

Species & units: Alder, Birch, Grass, Mugwort, Olive, Ragweed — grains/m³
Temporal: hourly steps
Horizon: up to 4 days ahead
Level: surface (ground level)

Pollen levels by species (grains/m3)

Species (group)	Low	Moderate	High	Very high
Alder (Tree)	0–14	15–89	90–1,499	≥1,500
Birch (Tree)	0–14	15–89	90–1,499	≥1,500
Olive (Tree)	0–14	15–89	90–1,499	≥1,500
Grass (Grass)	0–4	5–19	20–199	≥200
Mugwort (Weed)	0–9	10–49	50–499	≥500
Ragweed (Weed)	0–9	10–49	50–499	≥500

Interpretation (for UI/alerts)

Low – generally safe for most users.
Moderate – sensitive users may experience symptoms.
High – many allergic users will have symptoms; consider alerts and guidance.
Very high – peak-season conditions; strong precautions for vulnerable users.

Current pollen data

API call

http://api.openweathermap.org/pollen/1.0/current?lat={lat}&lon={lon}&appid={API key}

Parameters
lat	required	Latitude. If you need the geocoder to automatic convert city names and zip-codes to geo coordinates and the other way around, please use our Geocoding API
lon	required	Longitude. If you need the geocoder to automatic convert city names and zip-codes to geo coordinates and the other way around, please use our Geocoding API
appid	required	Your unique API key (you can always find it on your account page under the "API key" tab)

Example of API request

http://api.openweathermap.org/pollen/1.0/current?lat=50&lon=0&appid={API key}

                
{
  "latitude": 50.0,
  "longitude": 0.0,
  "pollen": {
    "ALDER": 0.12,
    "BIRCH": 0.03,
    "GRASS": 27.4,
    "MUGWORT": 1.6,
    "OLIVE": 0.0,
    "RAGWEED": 0.2
  }
}

Example of API response

{
  "latitude": 50.0,
  "longitude": 0.0,
  "pollen": {
    "ALDER": 0.12,
    "BIRCH": 0.03,
    "GRASS": 27.4,
    "MUGWORT": 1.6,
    "OLIVE": 0.0,
    "RAGWEED": 0.2
  }
}

Fields in API response

latitude Latitude of the location
longitude Longitude of the location
pollen

ALDER Concentration of Alder pollen, grains/m³
BIRCH Concentration of Birch pollen, grains/m³
GRASS Concentration of Grass pollen, grains/m³
MUGWORT Concentration of Mugwort pollen, grains/m³
OLIVE Concentration of Olive pollen, grains/m³
RAGWEED Concentration of Ragweed pollen, grains/m³

Forecast pollen data

API call

http://api.openweathermap.org/pollen/1.0/forecast?lat={lat}&lon={lon}&appid={API key}

Parameters
lat	required	Latitude. If you need the geocoder to automatic convert city names and zip-codes to geo coordinates and the other way around, please use our Geocoding API
lon	required	Longitude. If you need the geocoder to automatic convert city names and zip-codes to geo coordinates and the other way around, please use our Geocoding API
appid	required	Your unique API key (you can always find it on your account page under the "API key" tab)

Example of API request

http://api.openweathermap.org/pollen/1.0/forecast?lat=50&lon=0&appid={API key}

                
{
  "latitude": 50.0,
  "longitude": 0.0,
  "forecast": [
    {
      "datetime": "2025-08-27T16:00:00+00:00",
      "pollen": {
        "ALDER": 0.10,
        "BIRCH": 0.02,
        "GRASS": 25.1,
        "MUGWORT": 1.3,
        "OLIVE": 0.0,
        "RAGWEED": 0.2
      }
    },
    {
      "datetime": "2025-08-27T17:00:00+00:00",
      "pollen": {
        "ALDER": 0.11,
        "BIRCH": 0.02,
        "GRASS": 24.9,
        "MUGWORT": 1.1,
        "OLIVE": 0.0,
        "RAGWEED": 0.2
      }
    }
  ]
}

Example of API response

{
  "latitude": 50.0,
  "longitude": 0.0,
  "forecast": [
    {
      "datetime": "2025-08-27T16:00:00+00:00",
      "pollen": {
        "ALDER": 0.10,
        "BIRCH": 0.02,
        "GRASS": 25.1,
        "MUGWORT": 1.3,
        "OLIVE": 0.0,
        "RAGWEED": 0.2
      }
    },
    {
      "datetime": "2025-08-27T17:00:00+00:00",
      "pollen": {
        "ALDER": 0.11,
        "BIRCH": 0.02,
        "GRASS": 24.9,
        "MUGWORT": 1.1,
        "OLIVE": 0.0,
        "RAGWEED": 0.2
      }
    }
  ]
}

Fields in API response

latitude Latitude of the location
longitude Longitude of the location
forecast

forecast.datetime Date and time, ISO 8601 format
forecast.pollen

pollen.ALDER Concentration of Alder pollen, grains/m³
pollen.BIRCH Concentration of Birch pollen, grains/m³
pollen.GRASS Concentration of Grass pollen, grains/m³
pollen.MUGWORT Concentration of Mugwort pollen, grains/m³
pollen.OLIVE Concentration of Olive pollen, grains/m³
pollen.RAGWEED Concentration of Ragweed pollen, grains/m³