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from $1.00 / 1,000 measurement fetcheds

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OpenAQ Air Quality Tracker — PM2.5, PM10, NO2, O3, CO, SO2

Try for free

Fetch real-time and historical air quality measurements from 30,000+ monitoring stations worldwide via the OpenAQ API v3. Supports PM2.5, PM10, NO2, O3, CO, SO2 across any country. Returns AQI category per reading. No API key required — optional key raises rate limits.

Pricing

from $1.00 / 1,000 measurement fetcheds

Rating

0.0

(0)

Developer

Hojun Lee

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Bookmarked

Total users

Monthly active users

16 days ago

Last modified

OpenAQ Air Quality Tracker

Collect real-time and historical air quality measurements from 30,000+ monitoring stations worldwide using the OpenAQ API v3. Track PM2.5, PM10, NO2, O3, CO, and SO2 across any country — with built-in AQI category labels.

Two data sources:

Without a key (default): OpenAQ v3 now requires an API key, so keyless runs return modelled current or hourly concentrations (Copernicus CAMS via the Open-Meteo Air Quality API) for the major cities of 35 countries (US, KR, DE, GB, FR, JP, CN, IN, …). These are model estimates on an ~11–40 km grid, not station readings. source = Open-Meteo (CAMS model); units are µg/m³ for every pollutant.
With a free OpenAQ key: station-level measurements from OpenAQ's 30,000+ monitoring stations. source = OpenAQ.

What it does

Mode	Description
`latest`	Most recent measurement per station per pollutant
`historical`	All measurements in a user-specified date range
`locations`	Station metadata only (coordinates, city, country)

Each output record includes location name, city, country, GPS coordinates, pollutant name, value, unit, AQI category (for PM2.5), and timestamp.

Input

Field	Type	Default	Description
`mode`	string	`latest`	`latest`, `historical`, or `locations`
`countries`	array	`[]`	ISO 2-letter country codes (e.g. `US`, `KR`, `DE`). Empty = all
`parameters`	array	`[]`	Pollutant IDs: `pm25`, `pm10`, `no2`, `o3`, `co`, `so2`. Empty = all
`maxLocations`	integer	`50`	Max stations per country
`dateFrom`	string	`""`	ISO 8601 start for historical mode (e.g. `2026-08-01T00:00:00Z`)
`dateTo`	string	`""`	ISO 8601 end for historical mode
`openaqApiKey`	string	`""`	OpenAQ API key for station data. Without it, the actor uses keyless Open-Meteo CAMS model data for major cities

Output

{
  "location_id": 12345,
  "location_name": "Seoul Station",
  "city": "Seoul",
  "country": "KR",
  "coordinates": { "lat": 37.5566, "lon": 126.9722 },
  "parameter": "pm25",
  "value": 23.5,
  "unit": "µg/m³",
  "aqi_category": "Moderate",
  "measured_at": "2026-09-02T08:00:00Z",
  "source": "OpenAQ"
}

AQI Categories (PM2.5, US EPA)

µg/m³	Category
0 – 12	Good
12 – 35.4	Moderate
35.5 – 55.4	Unhealthy for Sensitive Groups
55.5 – 150.4	Unhealthy
150.5 – 250.4	Very Unhealthy
250.5+	Hazardous

Pricing (Pay-Per-Event)

Event	Price
Actor start	$0.005
Per measurement record	$0.001

Example: querying 3 countries × 50 stations × 3 pollutants ≈ 450 records → ~$0.46

Data source

OpenAQ aggregates data from government monitoring networks around the world. Data quality and availability vary by country and station.

API docs: https://api.openaq.org/v3
Get a free API key: https://explore.openaq.org/register

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