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

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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

Pay per usage

Rating

0.0

(0)

Developer

Hojun Lee

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Bookmarked

Total users

Monthly active users

19 hours 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 and no required API key.

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	`""`	Optional API key — increases rate limits

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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