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. 2020 Aug 27;211:118701. doi: 10.1016/j.energy.2020.118701

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Fig. 3 — Comparison of environmental (GHG) footprint and potential energy recovery of different masks/respiratory. ^a [33], ^b [35], ^c [33], ^d [35], ^eCalculated based on the low heating value of plastic based on Klemeš et al. [36]. PP = polypropylene. Al = Aluminium. HDPE = High-density polyethylene.