An important goal of IPCC inventory guidance is to support the development of national greenhouse gas inventories that can be readily assessed in terms of quality. It is good practice to implement quality assurance/quality control (QA/QC) and verification procedures in the development of national greenhouse gas inventories to accomplish this goal. The procedures as described in this chapter also s...

This chapter provides guidance on estimating and reporting uncertainties associated with both annual estimates of emissions and removals, and emission and removal trends over time. It also explains why uncertainty assessment is a useful means of improving emission inventories. This guidance is written primarily for inventory compilers and provides, with examples, two approaches for combining categ...

The 2006 IPCC Guidelines for National Greenhouse Gas Inventories (2006 IPCC Guidelines) which were published in 2006 provide methodologies for estimating national inventories of anthropogenic emissions by sources and removals by sinks of greenhouse gases. This IPCC Methodology Report titled the 2019 Refinement to the 2006 IPCC Guidelines for National Greenhouse Gas Inventories (2019 Refinement) wa...

A core requirement of the Paris Agreement is for countries to report on their greenhouse gas (GHG) emissions and the action they will take to reduce them. Equipped with more accurate emission inventories, countries can make informed decisions around how to reduce their emissions, including which sectors to focus on.This new toolkit supports decision makers and inventory compilers from least develo...

Black carbon (BC) is a key short-lived climate forcer and an air pollutant with significant impacts on human health. Although reporting of BC emissions remains voluntary under the Convention on Long-range Transboundary Air Pollution, 42 Parties submitted BC data in 2024. This report assesses the completeness, methodological consistency and comparability of reported BC emissions and compares nation...

The Conference of the Parties (COP), by decision 24/CP.19, adopted the “Guidelines for the preparation of national communications by Parties included in Annex I to the Convention, Part I: UNFCCC reporting guidelines on annual greenhouse gas inventories” (UNFCCC Annex I inventory reporting guidelines) and tables of the common reporting format to implement the use of the 2006 IPCC Guidelines for Nat...

This document contains the guidelines for reporting emissions and projections data under the Convention on Long-range Transboundary Air Pollution as adopted for application in 2015 and subsequent years. These guidelines are a revised version of the Guidelines for Reporting Emission data under the Convention (ECE/EB.AIR/97), which were approved by the Executive Body in 2008 (ECE/EB.AIR/96, para. 83...

Developing a greenhouse gas (GHG) inventory is an important first step toward managing emissions. A complete and transparent national GHG inventory is an essential tool for understanding emissions and trends, projecting future emissions and identifying sectors for cost-effective emission reduction opportunities. A national GHG inventory is also a core element of reporting under the United Nations ...

Developing a greenhouse gas (GHG) inventory is an important first step toward managing emissions. A complete and transparent national GHG inventory is an essential tool for understanding emissions and trends, projecting future emissions and identifying sectors for cost-effective emission reduction opportunities. A national GHG inventory is also a core element of reporting under the United Nations ...

EPA develops an annual report called the Inventory of U.S. Greenhouse Gas Emissions and Sinks (Inventory), that tracks U.S. greenhouse gas emissions and sinks by source, economic sector, and greenhouse gas going back to 1990. EPA has prepared the Inventory of U.S. Greenhouse Gas Emissions and Sinks since the early 1990s. This annual report, provides a comprehensive accounting of total greenhouse g...