"summer smog" meaning in English

{
  "forms": [
    {
      "form": "summer smogs",
      "tags": [
        "plural"
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      "expansion": "summer smog (countable and uncountable, plural summer smogs)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
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          "name": "English entries with incorrect language header",
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      ],
      "glosses": [
        "Photochemical smog."
      ],
      "id": "en-summer_smog-en-noun-TvhP2oK0",
      "links": [
        [
          "Photochemical smog",
          "photochemical smog"
        ]
      ],
      "tags": [
        "countable",
        "uncountable"
      ]
    }
  ],
  "word": "summer smog"
}

{
  "forms": [
    {
      "form": "summer smogs",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "~"
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      "expansion": "summer smog (countable and uncountable, plural summer smogs)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
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        "English lemmas",
        "English multiword terms",
        "English nouns",
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        "Pages with 1 entry",
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      ],
      "glosses": [
        "Photochemical smog."
      ],
      "links": [
        [
          "Photochemical smog",
          "photochemical smog"
        ]
      ],
      "tags": [
        "countable",
        "uncountable"
      ]
    }
  ],
  "word": "summer smog"
}