`tri_trends`

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

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

Analyze toxic release trends over time by state or chemical. Returns historical release data across years to identify patterns and changes.

Parameters

Name	Type	Required	Description
`state`	string	no	Two-letter state abbreviation (e.g., “OH”).
`chemical`	string	no	Chemical name (e.g., “LEAD”).
`start_year`	number	no	Start year for the trend range (default: 5 years ago).
`end_year`	number	no	End year for the trend range (default: most recent available).

Example call

Arguments

{
  "state": "TX",
  "start_year": 2018,
  "end_year": 2023
}

curl

curl -X POST https://gateway.pipeworx.io/epa-emissions/mcp \
  -H 'Content-Type: application/json' \
  -d '{"jsonrpc":"2.0","id":1,"method":"tools/call","params":{"name":"tri_trends","arguments":{"state":"TX","start_year":2018,"end_year":2023}}}'

TypeScript (@pipeworx/sdk)

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

const result = await pipeworx.call('tri_trends', {
  "state": "TX",
  "start_year": 2018,
  "end_year": 2023
});

More examples

{
  "chemical": "BENZENE",
  "start_year": 2015
}

Response shape

Always returns: state, chemical, start_year, end_year, trends

Field	Type	Description
`state`	string \| null	State abbreviation or null if not filtered
`chemical`	string \| null	Chemical name (uppercase) or null if not filtered
`start_year`	number	First year in the trend range
`end_year`	number	Last year in the trend range
`trends`	array	Year-by-year release totals and facility counts

Full JSON Schema

{
  "type": "object",
  "properties": {
    "state": {
      "type": [
        "string",
        "null"
      ],
      "description": "State abbreviation or null if not filtered"
    },
    "chemical": {
      "type": [
        "string",
        "null"
      ],
      "description": "Chemical name (uppercase) or null if not filtered"
    },
    "start_year": {
      "type": "number",
      "description": "First year in the trend range"
    },
    "end_year": {
      "type": "number",
      "description": "Last year in the trend range"
    },
    "trends": {
      "type": "array",
      "items": {
        "type": "object",
        "properties": {
          "year": {
            "type": "number",
            "description": "Reporting year"
          },
          "total_releases": {
            "type": "number",
            "description": "Total quantity released that year"
          },
          "facility_count": {
            "type": "number",
            "description": "Number of facilities with releases that year"
          }
        },
        "required": [
          "year",
          "total_releases",
          "facility_count"
        ]
      },
      "description": "Year-by-year release totals and facility counts"
    }
  },
  "required": [
    "state",
    "chemical",
    "start_year",
    "end_year",
    "trends"
  ]
}

Connect

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

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

See Getting Started for client-specific install steps.

tri_trends