RT null T1 Monitoring of dl-POPs and PFOS and its Precursors in Air – Africa Region A2 Fiedler, Heidelore K1 persistent organic pollutant K1 air pollution K1 Africa YR 2018 FD 2018 LK https://wedocs.unep.org/handle/20.500.11822/26132 UL https://wedocs.unep.org/handle/20.500.11822/26132 DS UN Environment Document Repository RD Sep 20, 2026