From EPA.gov:
Subpart W–Petroleum and Natural Gas Systems
Rule Information
On November 8, 2010, Administrator Jackson signed a rule that finalizes reporting requirements for the petroleum and natural gas industry under 40 CFR Part 98, the regulatory framework for the Greenhouse Gas (GHG) Reporting Program.
This final rule requires petroleum and natural gas facilities that emit 25,000 metric tons or more of carbon dioxide (CO2) equivalent per year to report annual methane (CH4) and CO2 emissions from equipment leaks and venting, and emissions of CO2, CH4, and nitrous oxide (N2O) from gas flaring and from onshore petroleum and natural gas production stationary and portable combustion emissions and combustion emissions from stationary equipment involved in natural gas distribution.
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