{
  "Header": [
    {
      "status": "Success",
      "request_time": "2026-05-17T08:17:20-04:00",
      "url": "https://aqs.epa.gov/data/api/list/parametersByClass?email=test%40aqs.api&key=test&pc=CRITERIA",
      "rows": 8
    }
  ],
  "Data": [
    {
      "code": "14129",
      "value_represented": "Lead (TSP) LC"
    },
    {
      "code": "42101",
      "value_represented": "Carbon monoxide"
    },
    {
      "code": "42401",
      "value_represented": "Sulfur dioxide"
    },
    {
      "code": "42602",
      "value_represented": "Nitrogen dioxide (NO2)"
    },
    {
      "code": "44201",
      "value_represented": "Ozone"
    },
    {
      "code": "81102",
      "value_represented": "PM10 Total 0-10um STP"
    },
    {
      "code": "85129",
      "value_represented": "Lead PM10 LC FRM/FEM"
    },
    {
      "code": "88101",
      "value_represented": "PM2.5 - Local Conditions"
    }
  ]
}