PM2.5 Open Data Portal API

Beginner's Pick Environment / No Auth Required Beginner HTTPS

Free to Use

87 A

Metadata Score Metadata estimate · not endpoint-tested

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Overview

PM2.5 Open Data Portal provides free access to low-cost PM2.5 (fine particulate matter) sensor data from the LASS community network across Asia, particularly Taiwan. No API key is required, making it instantly accessible for developers and researchers. The API returns sensor readings in JSON format and supports filtering by device ID, location, or time range.

Beginner Tip

No registration required — you can start fetching PM2.5 sensor data immediately using the REST endpoints. Use the /project/all/ endpoint to browse available data projects, then narrow down to specific device readings using a device ID.

Available Data

The kind of data this API exposes, based on its documentation. We could not call the endpoint to confirm the exact field names.

Use case: Integrate open low-cost pm2.5 sensor data data into web and mobile applications

PM2.5 Open Data Portal data via REST API

Example Response

Illustrative shape only — we were not able to call this endpoint (it requires credentials or exposes no public sample URL), so the fields below show the kind of data this API returns rather than a recorded response.

JSON Response · Illustrative

{
  "status": "success",
  "data": {
    "result": "Data from PM2.5 Open Data Portal",
    "description": "Open low-cost PM2.5 sensor data",
    "timestamp": "2025-01-15T10:00:00Z"
  }
}

Field Reference

device_id Unique identifier of the LASS sensor device that recorded the measurement

feeds Array of time-stamped sensor readings from the device

feeds[].AirBox.s_d0 PM2.5 concentration in micrograms per cubic meter (μg/m³) from the primary sensor channel

feeds[].timestamp ISO 8601 timestamp indicating when the measurement was recorded by the sensor

source Data source identifier indicating which sensor network or project provided the data

Implementation Example

Calls a real endpoint of this API. Replace any placeholder credentials with your own key.

Request

const url = "https://pm25.lass-net.org/API-1.0.0/project/all/?format=JSON";
const response = await fetch(url);
if (!response.ok) throw new Error(`Request failed: ${response.status}`);
const data = await response.json();
console.log(data);

What Can You Build?

Note: These code examples are AI-generated and unverified. Always refer to the official API documentation for accurate usage.

Common Errors & Troubleshooting

Generated guidance based on this API's documentation, not observed by us. Treat it as a starting point and check against the provider's own error reference.

Empty feeds array No data is available for the requested device ID or time window

✓ Check that the device ID exists using the /device/all endpoint, and try querying without a time range filter first

Connection timeout The LASS network API may have intermittent availability

✓ Implement retry logic with exponential backoff; community APIs may have limited uptime compared to commercial services

Unexpected data format Different sensor types report different field names in the feeds array

✓ Always check for field existence before accessing values, as fields vary by sensor model (e.g. s_d0 vs s_d1 for different PM channels)

Metadata Score Breakdown

Estimated from metadata — endpoint not independently tested

This score is estimated from observable metadata — HTTPS support, authentication model, declared CORS, and documentation reachability — because the API requires authentication or exposes no publicly testable endpoint. The five-signal breakdown is only shown for live-tested APIs.

Metadata estimate · endpoint not independently tested

How is this scored? →