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The concentration of a given species in a pristine air mass in which anthropogenic impurities of a relatively short lifetime are not present., Vaadeldava aine kontsentratsioon looduslikus õhus, milles puuduvad lühiealised antrpogeense päritoluga saasteained
background concentration . Keemiaterminite baas. Estonian Language Institute, Sõnaveeb 2026. https://sonaveeb.ee/search/unif//kem/background%20concentration/1/eng (13.07.2026)
