"emissions test" meaning in English

{
  "forms": [
    {
      "form": "emissions tests",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "head": "emissions test"
      },
      "expansion": "emissions test (plural emissions tests)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        }
      ],
      "derived": [
        {
          "word": "emissions testing"
        }
      ],
      "glosses": [
        "A measurement performed on motor vehicles, required by the DMV, to prevent issuing valid registration if an excessive amount of waste fumes are produced during typical use. Cars typically are placed on a dynamometer to simulate different driving speeds."
      ],
      "id": "en-emissions_test-en-noun-UriosxHF",
      "links": [
        [
          "measurement",
          "measurement"
        ],
        [
          "DMV",
          "DMV"
        ],
        [
          "Cars",
          "car"
        ],
        [
          "dynamometer",
          "dynamometer"
        ]
      ],
      "wikipedia": [
        "Emission standard"
      ]
    }
  ],
  "word": "emissions test"
}

{
  "derived": [
    {
      "word": "emissions testing"
    }
  ],
  "forms": [
    {
      "form": "emissions tests",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "head": "emissions test"
      },
      "expansion": "emissions test (plural emissions tests)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        "English countable nouns",
        "English entries with incorrect language header",
        "English lemmas",
        "English multiword terms",
        "English nouns"
      ],
      "glosses": [
        "A measurement performed on motor vehicles, required by the DMV, to prevent issuing valid registration if an excessive amount of waste fumes are produced during typical use. Cars typically are placed on a dynamometer to simulate different driving speeds."
      ],
      "links": [
        [
          "measurement",
          "measurement"
        ],
        [
          "DMV",
          "DMV"
        ],
        [
          "Cars",
          "car"
        ],
        [
          "dynamometer",
          "dynamometer"
        ]
      ],
      "wikipedia": [
        "Emission standard"
      ]
    }
  ],
  "word": "emissions test"
}