json_schema: {
    "$schema": "http://json-schema.org/draft-04/schema#",
    "type": "object",
    "required": [
      "location",
      "country",
      "city",
      "parameter",
      "unit",
      "value",
      "date",
      "sourceName",
      "sourceType",
      "mobile"
    ],
    "properties": {
      "location": {
        "type": "string",
        "minLength": 1
      },
      "parameter": {
        "type": "string",
        "enum": [
          "pm25",
          "pm10",
          "no2",
          "so2",
          "o3",
          "co",
          "bc"
        ]
      },
      "unit": {
        "type": "string",
        "enum": [
          "ug/m^3",
          "ppm"
        ]
      },
      "averagingPeriod": {
        "type": "object",
        "required": [
          "value",
          "unit"
        ],
        "additionalProperties": false,
        "properties": {
          "value": {
            "type": "number"
          },
          "unit": {
            "type": "string",
            "enum": [
              "hours"
            ]
          }
        }
      },
      "attribution": {
        "type": "array",
        "items": {
          "type": "object",
          "required": [
            "name"
          ],
          "additionalProperties": false,
          "properties": {
            "name": {
              "type": "string",
              "minLength": 1
            },
            "url": {
              "type": "string",
              "pattern": "^(https?://)?([\\da-z\\.-]+)\\.([a-z\\.]{2,6})([/\\w \\.-]*)*/?"
            }
          }
        }
      },
      "coordinates": {
        "type": "object",
        "required": [
          "latitude",
          "longitude"
        ],
        "additionalProperties": false,
        "properties": {
          "latitude": {
            "type": "number",
            "minimum": -90,
            "maximum": 90
          },
          "longitude": {
            "type": "number",
            "minimum": -180,
            "maximum": 180
          }
        }
      },
      "value": {
        "type": "number"
      },
      "date": {
        "type": "object",
        "additionalProperties": false,
        "required": [
          "utc",
          "local"
        ],
        "properties": {
          "utc": {
            "type": "string"
          },
          "local": {
            "type": "string",
            "pattern": "\\d{4}-\\d{2}-\\d{2}T\\d{2}:\\d{2}:\\d{2}(\\+|-)\\d{2}:\\d{2}"
          }
        }
      },
      "sourceName": {
        "type": "string",
        "minLength": 1
      },
      "sourceType": {
        "type": "string",
        "enum": [
          "government",
          "research",
          "other"
        ]
      },
      "mobile": {
        "type": "boolean"
      },
      "city": {
        "type": "string",
        "minLength": 1
      },
      "country": {
        "type": "string",
        "maxLength": 2,
        "minLength": 2
      }
    }
  }
  