`aqs_list_parameters`

Pack: epa-aqs · Endpoint: https://gateway.pipeworx.io/epa-aqs/mcp

No MCP client? Call it directly: GET https://gateway.pipeworx.io/v1/tools/aqs_list_parameters for the schema, then POST the same URL with its arguments for the data.

Look up the EPA AQS code lists the other tools in this pack need — pollutant parameter codes, parameter classes, states, counties, sites and monitoring agencies. Call this FIRST to turn “ozone” into 44201 or “North Carolina” into 37. Sourced from the EPA Air Quality System. Requires an EPA AQS email + key.

Parameters

Name	Type	Required	Description
`list`	string	yes	Which list: “classes” (parameter groups), “parametersByClass” (needs pc), “states”, “countiesByState” (needs state), “sitesByCounty” (needs state + county), “cbsas”, “pqaos”, “mas”
`pc`	string	no	Parameter class, e.g. “CRITERIA”, “AQI POLLUTANTS”, “ALL” — required for parametersByClass
`state`	string	no	Two-digit state FIPS, e.g. “37” for North Carolina
`county`	string	no	Three-digit county FIPS, e.g. “183”
`email`	string	no	The email the AQS key was issued to, if not folded into _apiKey
`_apiKey`	string	no	EPA AQS credential as ”:”, or just "" with email= set. Register at https://aqs.epa.gov/data/api/signup?email=

Example call

Arguments

{
  "list": "classes"
}

curl

curl -X POST https://gateway.pipeworx.io/epa-aqs/mcp \
  -H 'Content-Type: application/json' \
  -d '{"jsonrpc":"2.0","id":1,"method":"tools/call","params":{"name":"aqs_list_parameters","arguments":{"list":"classes"}}}'

TypeScript (@pipeworx/sdk)

import { Pipeworx } from '@pipeworx/sdk';
const pipeworx = new Pipeworx();

const result = await pipeworx.call('aqs_list_parameters', {
  "list": "classes"
});

More examples

{
  "list": "countiesByState",
  "state": "37"
}

Connect

Add this to your MCP client config, or use one-click install buttons:

{
  "mcpServers": {
    "epa-aqs": {
      "url": "https://gateway.pipeworx.io/epa-aqs/mcp"
    }
  }
}

See Getting Started for client-specific install steps.

Regenerated from source · build September 18, 2026

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