Historical variations of δ202Hg and Δ199Hg in speciated Hg emissions.
Historical (1850s to 2010s) variations of δ202Hg and Δ199Hg for GEM (A), GOM (B) and PBM (C) emitted from ‘by-product’ sectors and all sectors (by-product’ + ‘intentional Hg use’), bounding within 90% confidence levels (P10 to P90).