Chapter 3 E-Annex: Methodology for estimating mercury emissions to air and results of the 2015 global emissions inventory

This technical annex, serving as Chapter 3 of the Global Mercury Assessment, outlines the methodology used to estimate global mercury emissions to air for the 2015 emissions inventory. It applies a rigorous, three-step approach: collecting statistical activity data, applying unabated emission factors (UEFs), and incorporating technological controls for mercury abatement. Chapter 3 provides detailed examples, including sector-specific calculations such as for cement production in China and mercury emissions from artisanal and small-scale gold mining (ASGM). The annex highlights the critical role of assumptions due to sparse data, using proxies like GDP-PPP and regional technology profiles. It also presents emission factor tables and abatement technology profiles across diverse sectors—from coal combustion and metal production to waste incineration and cremation.