RT null T1 Monitoring of dl-POPs and PFOS and its precursors in Air – Asia-Pacific Region A2 Fiedler, Heidelore YR 2018 FD 2018 LK https://wedocs.unep.org/handle/20.500.11822/26164 UL https://wedocs.unep.org/handle/20.500.11822/26164 DS UN Environment Document Repository RD Sep 22, 2026