{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "$id": "https://raw.githubusercontent.com/api-evangelist/us-chemical-safety-and-hazard-investigation-board/main/json-schema/csb-incident-schema.json",
  "title": "CSB Chemical Incident",
  "description": "JSON Schema representing a chemical incident reported to or investigated by the US Chemical Safety and Hazard Investigation Board (CSB), including accidental releases reported under the Accidental Release Reporting Rule.",
  "type": "object",
  "properties": {
    "incidentId": {
      "type": "string",
      "description": "Unique identifier for the incident",
      "examples": ["CSB-2023-001", "2023-01-I-TX-0001"]
    },
    "incidentDate": {
      "type": "string",
      "format": "date",
      "description": "Date the incident occurred",
      "examples": ["2023-04-15"]
    },
    "incidentTime": {
      "type": "string",
      "format": "time",
      "description": "Time the incident occurred (local time)",
      "examples": ["14:30:00"]
    },
    "facilityName": {
      "type": "string",
      "description": "Name of the facility where the incident occurred",
      "examples": ["Acme Chemical Plant", "XYZ Refinery"]
    },
    "facilityLocation": {
      "$ref": "#/$defs/Location"
    },
    "facilityType": {
      "type": "string",
      "description": "Type of industrial facility",
      "examples": ["Chemical Plant", "Oil Refinery", "Petrochemical Facility", "Fertilizer Plant", "Water Treatment Plant"]
    },
    "naicsCode": {
      "type": "string",
      "description": "NAICS industry classification code for the facility",
      "examples": ["325110", "324110"]
    },
    "incidentType": {
      "type": "string",
      "description": "Primary type of incident",
      "enum": [
        "Explosion",
        "Fire",
        "Chemical Release",
        "Toxic Release",
        "Reactive Incident",
        "Multiple Causes"
      ]
    },
    "chemicalsInvolved": {
      "type": "array",
      "items": {
        "$ref": "#/$defs/ChemicalInvolved"
      },
      "description": "List of hazardous chemicals involved in the incident"
    },
    "casualties": {
      "$ref": "#/$defs/Casualties"
    },
    "investigationStatus": {
      "type": "string",
      "description": "Current status of CSB investigation",
      "enum": [
        "Current",
        "Completed",
        "No Investigation"
      ]
    },
    "investigationReport": {
      "type": "string",
      "format": "uri",
      "description": "URL to the CSB investigation report if available",
      "examples": ["https://www.csb.gov/investigations/completed-investigations/"]
    },
    "recommendations": {
      "type": "array",
      "items": {
        "$ref": "#/$defs/Recommendation"
      },
      "description": "Safety recommendations issued as a result of this incident"
    },
    "rootCauses": {
      "type": "array",
      "items": {
        "type": "string"
      },
      "description": "Root causes identified by CSB investigation"
    },
    "regulatoryNotifications": {
      "type": "array",
      "items": {
        "type": "string"
      },
      "description": "Regulatory agencies notified (EPA, OSHA, state agencies)"
    }
  },
  "required": ["incidentId", "incidentDate", "facilityName", "incidentType"],
  "$defs": {
    "Location": {
      "title": "Location",
      "description": "Geographic location of the incident",
      "type": "object",
      "properties": {
        "address": {
          "type": "string",
          "description": "Street address of the facility"
        },
        "city": {
          "type": "string",
          "description": "City where the incident occurred"
        },
        "state": {
          "type": "string",
          "description": "US state abbreviation",
          "examples": ["TX", "LA", "WV", "CA"]
        },
        "zipCode": {
          "type": "string",
          "description": "ZIP code",
          "pattern": "^\\d{5}(-\\d{4})?$"
        },
        "latitude": {
          "type": "number",
          "description": "Geographic latitude",
          "minimum": -90,
          "maximum": 90
        },
        "longitude": {
          "type": "number",
          "description": "Geographic longitude",
          "minimum": -180,
          "maximum": 180
        }
      },
      "required": ["city", "state"]
    },
    "ChemicalInvolved": {
      "title": "Chemical Involved",
      "description": "A chemical involved in an incident",
      "type": "object",
      "properties": {
        "chemicalName": {
          "type": "string",
          "description": "Common name of the chemical",
          "examples": ["Chlorine", "Anhydrous Ammonia", "Hydrogen Sulfide", "Methanol"]
        },
        "casNumber": {
          "type": "string",
          "description": "Chemical Abstracts Service (CAS) registry number",
          "pattern": "^\\d{2,7}-\\d{2}-\\d$",
          "examples": ["7782-50-5", "7664-41-7"]
        },
        "quantity": {
          "type": "number",
          "description": "Estimated quantity released"
        },
        "quantityUnit": {
          "type": "string",
          "description": "Unit of measure for released quantity",
          "examples": ["pounds", "gallons", "tons", "kg"]
        },
        "hazardClass": {
          "type": "string",
          "description": "OSHA hazard classification",
          "examples": ["Toxic", "Flammable", "Reactive", "Corrosive", "Explosive"]
        }
      },
      "required": ["chemicalName"]
    },
    "Casualties": {
      "title": "Casualties",
      "description": "Injury and fatality counts for an incident",
      "type": "object",
      "properties": {
        "fatalities": {
          "type": "integer",
          "minimum": 0,
          "description": "Number of fatalities"
        },
        "injuries": {
          "type": "integer",
          "minimum": 0,
          "description": "Number of injuries requiring medical treatment"
        },
        "evacuated": {
          "type": "integer",
          "minimum": 0,
          "description": "Number of persons evacuated"
        },
        "hospitalized": {
          "type": "integer",
          "minimum": 0,
          "description": "Number of persons hospitalized"
        }
      }
    },
    "Recommendation": {
      "title": "Safety Recommendation",
      "description": "A CSB safety recommendation issued following an investigation",
      "type": "object",
      "properties": {
        "recommendationNumber": {
          "type": "string",
          "description": "CSB recommendation number",
          "examples": ["2023-01-I-TX-R1"]
        },
        "recipientOrganization": {
          "type": "string",
          "description": "Organization to which the recommendation is directed",
          "examples": ["OSHA", "EPA", "Facility Name", "Industry Association"]
        },
        "description": {
          "type": "string",
          "description": "Text of the safety recommendation"
        },
        "status": {
          "type": "string",
          "description": "Current status of the recommendation",
          "enum": [
            "Open",
            "Closed - Acceptable Action",
            "Closed - Unacceptable Action",
            "Closed - No Response",
            "Closed - Superseded"
          ]
        },
        "issueDate": {
          "type": "string",
          "format": "date",
          "description": "Date recommendation was issued"
        }
      },
      "required": ["recommendationNumber", "description"]
    }
  }
}