Glossary

bottom-up inventory

A list of emission sources by category and quantity. Often refers to an aggregate emission rate estimate achieved by multiplying activity factors (counts of components, equipment, or throughput) by emission factors (estimates of gas-loss rates per unit of activity). Most bottom-up inventories use emission factors derived from industry averages rather than measurements specific to the company. Bottom-up inventory emission rate estimates are consistently lower than site-level and regional emissions measurements in academic research.

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