`tri_trends`

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

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