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GHG Reporting and Verification

GHG Reporting and Verification

For over 25 years, Ashworth Leininger Group (ALG) has offered expert air quality and environmental consulting services to a broad spectrum of clients, agencies, trade associations, and industry. ALG has been accredited as a Verification Body by California Air Resources Board (CARB) since the inception of the AB32 mandatory Greenhouse Gas (GHG) Reporting Program.  ALG is also accredited in Oregon for its GHG and Clean Fuels Programs (CFP), and in Washington for its GHG emissions reporting program.

Since inception of CARB's AB32 program, ALG has performed over 500 verifications for more than 200 separate facilities/entities.

In addition to GHG verification services, ALG also assists facilities in developing comprehensive GHG compliance and reporting programs to meet the state and federal requirements.

Sector Accreditations

ALG is qualified to report and verify all types of GHG emission reports submitted to California (CARB), Oregon (ODEQ), and Washington (Ecology).


Our team includes accredited specialists for Washington and California in:


  • Stationary combustion sources;

  • Transactions sources;

  • Oil and Gas Systems:

  • Process sources;


ALG is also accredited under Oregon's Greenhouse Gas Reporting Rule with the following specialties:

  • Electricity Suppliers;

  • Natural Gas Suppliers;

  • Natural Gas Systems;

  • Fuel Suppliers;

  • Process Emissions

Our Strengths

ALG’s verification team members have extensive experience in preparing greenhouse gas, criteria pollutant, and toxic pollutant emission inventory calculations and reports. Outside of GHG verifications, we have experience in formal and informal comprehensive auditing of facilities to determine compliance status with respect to a wide variety of local, state, and federal environmental regulations. With regards to GHG compliance, ALG assists companies in using the Environmental Protection Agency (EPA) e-GGRT and CARB Cal e-GGRT online reporting tools.

Industry Experience

ALG has performed third-party CARB greenhouse gas report verifications for:


  • electricity generation and cogeneration facilities,

  • electricity transaction entities,

  • oil and gas facilities,

  • natural gas and liquified petroleum gas (LPG) importers,

  • fuel transaction entities,

  • biomass combustion,

  • geothermal power production,

  • cement production,

  • petroleum refinery facilities, and

  • agricultural producers

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