RT null T1 Abiotic air sampling in the Africa Region A2 van der Veen, Ike A2 van Dijk, Rianne A2 de Boer, Jacob K1 persistent organic pollutant K1 Africa YR 2018 FD 2018 LK https://wedocs.unep.org/handle/20.500.11822/26131 UL https://wedocs.unep.org/handle/20.500.11822/26131 DS UN Environment Document Repository RD Sep 23, 2026