lˈændsbɜːɡ pˈʌblɪʃt ɐ ɡɹˈaʊndbɹˈeɪkɪŋ wˈoːɹn ˌɔn kɑːndɛnsˈeɪʃən nˈuːklɪi, ðə səbmaɪkɹˈɑːmɪɾɚsˈaɪzd pˈɑːɹɾɪkəlz ɪnðɪ ˈɛɹ ɐbˌaʊt wˌɪtʃ klˈaʊdz fˈɔːɹm, wˌɪtʃ wʌzðə fˈɜːst tʊ ɛɡzˈæmɪn ðə ɹˈoʊl sˈʌtʃ pɚtˈɪkjʊlˌeɪt mˈæɾɚ plˈeɪz ˌɔn ˈɛɹ pəlˈuːʃən ænd ðə dᵻɡɹˈiː tʊ wˌɪtʃ ɪɾ ɪz ɹᵻtˈeɪnd ɪnðə ɹˈɛspɹətˌoːɹi sˈɪstəm.
Landsberg published a ground-breaking worn on condensation nuclei, the submicrometre-sized particles in the air about which clouds form, which was the first to examine the role such particulate matter plays on air pollution and the degree to which it is retained in the respiratory system.