airqosm 0.2.0

Air pollution source metadata client, inference engine, and optional API

airqosm

airqosm is a lightweight Python package for:

• fetching source metadata from the AirQo Platform spatial API
• normalizing the platform response into a stable {message, data} shape
• inferring likely air pollution source metadata locally from features when needed

The local inference engine works from:

• site context (category, landuse, natural, highway)
• satellite pollutant summary means (SO2, HCHO, CO, NO2, O3, AOD)

It can run as:

• a Python client (SourceMetadataClient)
• a Python library (SourceMetadataEngine)
• an optional Flask API (airqosm-api)

Requirements

• Python >=3.9
• Dependencies are managed in pyproject.toml

Do I need a requirements.txt?

No, not for this package.

This package is already standards-based and pip-installable using pyproject.toml (PEP 517/518/621).
Use requirements.txt only if you specifically want a separate pinned file for CI/runtime environments.

Install

From PyPI:

pip install airqosm

Install with API server support:

pip install "airqosm[api]"

From this monorepo (editable mode):

cd packages/airqo-source-metadata
pip install -e .

Library Quick Start

Simple import style:

import airqosm

result = airqosm.source_metadata(
    latitude=5.798044,
    longitude=-0.8212,
    token="your-platform-token",
)

print(result["data"]["primary_source"])

Direct helper imports:

from airqosm import candidate_sources, primary_source

print(primary_source(5.798044, -0.8212, token="your-platform-token"))
print(candidate_sources(5.798044, -0.8212, token="your-platform-token"))

Fetch from AirQo Platform:

from airqosm import SourceMetadataClient

client = SourceMetadataClient(token="your-platform-token")

response = client.fetch(
    latitude=5.798044,
    longitude=-0.8212,
    include_satellite=True,
)

print(response["data"]["primary_source"])

The client automatically unwraps singleton list wrappers such as [[{...}]] and returns:

{
    "message": "Operation successful",
    "data": {
        "primary_source": {...},
        "candidate_sources": [...],
        ...
    },
}

Run local inference from features:

from airqosm import SourceMetadataEngine

engine = SourceMetadataEngine()

result = engine.build_from_features(
    latitude=0.322502,
    longitude=32.584726,
    site_category={
        "category": "Urban Background",
        "landuse": "commercial",
        "natural": "unknown",
        "highway": "primary",
        "area_name": "Kampala",
        "search_radius": 100,
        "waterway": "unknown",
    },
    satellite_pollutants_mean={
        "SO2": 0.00007,
        "HCHO": 0.00012,
        "CO": 0.05,
        "NO2": 0.00009,
        "O3": 0.14,
        "AOD": 1.2,
    },
    include_satellite=True,
)

print(result["primary_source"])

Run API

airqosm-api --host 0.0.0.0 --port 8010 --platform-token your-platform-token

The API command requires the optional API extra:

pip install "airqosm[api]"

Base URL: http://127.0.0.1:8010

Endpoints

• GET /healthz
• GET /api/v2/spatial/source_metadata
• POST /api/v1/source-metadata/from-features
• POST /api/v1/source-metadata/batch-from-features

API Examples

Coordinate lookup through the platform client:

curl "http://127.0.0.1:8010/api/v2/spatial/source_metadata?latitude=5.798044&longitude=-0.8212&include_satellite=true&token=your-platform-token"

Single request:

curl -X POST "http://127.0.0.1:8010/api/v1/source-metadata/from-features" \
  -H "Content-Type: application/json" \
  -d '{
    "latitude": 0.322502,
    "longitude": 32.584726,
    "site_category": {
      "category": "Urban Background",
      "landuse": "commercial",
      "natural": "unknown",
      "highway": "primary"
    },
    "satellite_pollutants_mean": {
      "SO2": 0.00007,
      "HCHO": 0.00012,
      "CO": 0.05,
      "NO2": 0.00009,
      "O3": 0.14,
      "AOD": 1.2
    }
  }'

Batch request:

curl -X POST "http://127.0.0.1:8010/api/v1/source-metadata/batch-from-features" \
  -H "Content-Type: application/json" \
  -d '{
    "include_satellite": true,
    "items": [
      {
        "id": "site-1",
        "latitude": 0.322502,
        "longitude": 32.584726,
        "site_category": {"category": "Urban Background", "landuse": "commercial", "natural": "unknown", "highway": "primary"},
        "satellite_pollutants_mean": {"SO2": 0.00007, "HCHO": 0.00012, "CO": 0.05, "NO2": 0.00009, "O3": 0.14, "AOD": 1.2}
      },
      {
        "id": "site-2",
        "latitude": 0.347596,
        "longitude": 32.582520,
        "site_category": {"category": "Major Highway", "landuse": "industrial", "natural": "unknown", "highway": "trunk"},
        "satellite_pollutants_mean": {"SO2": 0.0001, "HCHO": 0.00011, "CO": 0.06, "NO2": 0.00012, "O3": 0.13, "AOD": 1.0}
      }
    ]
  }'

Build and Publish (PyPI)

cd packages/airqo-source-metadata
python -m pip install --upgrade build twine
python -m build
python -m twine check dist/*
python -m twine upload dist/*

License

MIT