An official website of the State of Oregon
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Oregon's sector-based greenhouse gas inventory measures emissions produced within Oregon by economic sector. It also includes the emissions associated with all the electricity used in Oregon, including emissions from electricity generated out of the state and imported for use in Oregon. The inventory allows us to better understand historical trends, is used to track progress toward Oregon's emission reduction goals, informs climate policy and is the basis to develop emissions projections.
The inventory is compiled by integrating data from DEQ's Greenhouse Gas Reporting Program and modeled emissions estimates from EPA's State Inventory Tool. Starting with the 2010 emissions year approximately 80 percent of the total emissions data is derived from data reported directly to DEQ.
The updated sector-based inventory includes statewide emissions from 1990 through 2021. Based on this data, 2021 statewide emissions are 7% higher than 1990 levels. Emissions from transportation and electricity use continue to be Oregon's largest sources of greenhouse gas emissions. In 2021, emissions from transportation contributed to 35% of statewide emissions.
DEQ updates emission data for the entire inventory time series when improved methods or data become available. For this reason, published data sets may vary from year to year.
To provide the most current emissions estimates possible to decision makers, DEQ develops preliminary greenhouse gas estimates. These estimates are based on reported data that is often available up to a year earlier than data from EPA's State Inventory Tool. When an updated version of the inventory tool becomes available, DEQ updates and finalizes preliminary emission estimates.
Oregon's greenhouse gas reporting program collects emissions data from certain facilities, fuel importers, electricity and natural gas suppliers, and landfills. Data collected in the program improves the accuracy of our inventory and our understanding of Oregon's emissions. The majority of the mandatory reported emissions data is third-party verified and made available to the public annually on our Greenhouse Gas Reported Emissions page.
Since Oregon contributes to climate change in different ways, we have developed several resources to track emissions and indicators. Some of these include DEQ's consumption based inventory and the Oregon Global Warming Commission's work on Natural & Working Lands. Accounting for emissions in multiple ways creates a more complete understanding of our contribution to global climate change and helps identify opportunities to influence our impact.
For additional information please contact the greenhouse gas reporting program at GHGReport@deq.oregon.gov
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