Imported from tiangong-ai/agent-skills (airnow-hourly-obs-fetch/SKILL.md). Install upstream with npx skills add tiangong-ai/agent-skills --skill airnow-hourly-obs-fetch. Copyright stays with the author.

AirNow Hourly Observations

Use the CLI-owned airnow.hourly-observations capability. This Skill supplies intent routing and result-use boundaries only; the CLI owns source discovery, input/output schemas, HTTP behavior, limits, validation, and receipts.

Before running

1. Read references/tiangong-data-requirement.json.
2. Use the caller- or workspace-resolved stable CLI. The requirement declares compatible capability and operation contract majors; it does not select a package build.
3. Run data describe with that same CLI. Continue only when the capability ID and required contract majors match, and copy the exact current capability/operation versions from that response into the run request.

tiangong-ai data describe airnow.hourly-observations --json

Use the returned Discovery Metadata to confirm current source coverage, freshness, restrictions, provides, and doesNotProvide. Do not substitute facts remembered from an older Skill revision.

Prepare the request

Build a tiangong.data.run-request.v1 envelope. Replace the two version placeholders with the exact versions from the same data describe response. The operation input requires hour-aligned UTC timestamps, a WGS84 bounding box, and one or more supported pollutant identifiers:

{
  "schemaVersion": "tiangong.data.run-request.v1",
  "capabilityId": "airnow.hourly-observations",
  "capabilityVersion": "<describe.manifest.capabilityVersion>",
  "operationId": "fetch-hourly",
  "operationVersion": "<describe.manifest.operations[0].operationVersion>",
  "input": {
    "startDateTimeUtc": "2026-03-22T00:00:00Z",
    "endDateTimeUtc": "2026-03-22T06:00:00Z",
    "boundingBox": {
      "minLongitude": -123.5,
      "minLatitude": 37.0,
      "maxLongitude": -121.5,
      "maxLatitude": 38.8
    },
    "parameters": ["PM25", "OZONE"]
  }
}

Use the operation input schema returned by the same data describe response when selecting fields or values under input. Do not infer unsupported aliases or silently widen the requested time or geographic range.

Run

tiangong-ai data run airnow.hourly-observations fetch-hourly \
  --input /absolute/path/to/request.json --json

The command emits a tiangong.data.run-result.v1 envelope. Preserve its contract, warnings, errors, and receipt with data when handing the result to another workflow.

Result boundaries

• Treat partial as incomplete coverage and report missing or invalid hourly files; never convert missing observations to zero.
• Treat blocked as no usable business result and surface the structured errors instead of retrying with broader inputs.
• Do not interpret AQI as health advice, estimate exposure, interpolate between sites, combine other sources, or use preliminary AirNow records for regulatory compliance.
• Cross-source comparison and research evidence admission belong to the caller or Auto Research, not this atomic Skill.

Reference

• references/tiangong-data-requirement.json: stable capability requirement; it is not a package lock.