"low-emission" meaning in English

{
  "forms": [
    {
      "form": "lower-emission",
      "tags": [
        "comparative"
      ]
    },
    {
      "form": "lowest-emission",
      "tags": [
        "superlative"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "lower-emission",
        "sup": "lowest-emission"
      },
      "expansion": "low-emission (comparative lower-emission, superlative lowest-emission)",
      "name": "en-adj"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "adj",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with 1 entry",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with entries",
          "parents": [],
          "source": "w"
        }
      ],
      "examples": [
        {
          "text": "a low-emission fuel or vehicle",
          "type": "example"
        }
      ],
      "glosses": [
        "Producing fewer pollutants to be emitted into the atmosphere."
      ],
      "id": "en-low-emission-en-adj-mfWrZV2U",
      "related": [
        {
          "word": "zero-emission vehicle"
        }
      ]
    }
  ],
  "word": "low-emission"
}

{
  "forms": [
    {
      "form": "lower-emission",
      "tags": [
        "comparative"
      ]
    },
    {
      "form": "lowest-emission",
      "tags": [
        "superlative"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "lower-emission",
        "sup": "lowest-emission"
      },
      "expansion": "low-emission (comparative lower-emission, superlative lowest-emission)",
      "name": "en-adj"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "adj",
  "related": [
    {
      "word": "zero-emission vehicle"
    }
  ],
  "senses": [
    {
      "categories": [
        "English adjectives",
        "English entries with incorrect language header",
        "English lemmas",
        "English multiword terms",
        "English terms with usage examples",
        "Pages with 1 entry",
        "Pages with entries"
      ],
      "examples": [
        {
          "text": "a low-emission fuel or vehicle",
          "type": "example"
        }
      ],
      "glosses": [
        "Producing fewer pollutants to be emitted into the atmosphere."
      ]
    }
  ],
  "word": "low-emission"
}