Regulations last checked for updates: Jan 31, 2025

Title 40 - Protection of Environment last revised: Nov 08, 2025
All TitlesTitle 40Chapter IPart 98Subpart WAppendix - Table W-3 to Subpart W of Part 98—Default Total Hydrocarbon Population Emission Factors
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Appendix - Table W-3 to Subpart W of Part 98—Default Total Hydrocarbon Population Emission Factors
Industry segment Source type/component Emission factor
(scf total hydrocarbon/
hour/component)
Population Emission Factors—Storage Wellheads, Gas Service
Underground natural gas storageConnector0.01
Valve0.1
Pressure Relief Valve0.17
Open-Ended Line0.03
[89 FR 42325, May 14, 2024]
authority: 42 U.S.C. 7401-7671q.
source: 74 FR 56374, Oct. 30, 2009, unless otherwise noted.
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