This scientific study investigates morphological and morphometric changes in the major salivary glands of laboratory animals under chronic exposure to NO₂ and SO₂ gases. The histological structure of the parotid, submandibular, and sublingual salivary glands was analyzed using microscopic and morphometric methods. The results revealed cellular and tissue-level degeneration, inflammation, atrophic changes, and a decrease in secretory activity. These changes reflect the adverse effects of the gas mixture and emphasize the need for preventive measures to ensure environmental safety.

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