Orange County Transportation Authority

Skip navigation Reduce Motion High Contrast Careers Contact Us
Skip to main content
  • Greenhouse Gas Report 2015

  • The OCTA reviews GHG emissions from our fleet’s operations on an annual basis to understand our effect on Orange County’s vehicle air emission levels. Additionally, we review how overall emissions levels are affected when drivers shift from private vehicles to public transit. A reduction of congestion on our streets and freeways is expected when public transit is used. To quantify GHG emissions, the OCTA uses guidance from the American Public Transportation Association (APTA). APTA has set standards for Quantifying Greenhouse

    Gas Emissions From Transit. These standardized methodologies aid in calculating "displaced emissions" when people shift from cars to bus and rail.

    In October 2013, the OCTA joined government and industry leaders as members of The Climate Registry.  The Climate Registry is the leading voluntary greenhouse gas (GHG) registry in North America. A non profit group governed by states, provinces and tribes, The Climate Registry helps organizations measure and reduce their GHG emissions.  The OCTA was able to participate at no cost through funding from the Cool Planet Project Program from Southern California Edison. The Cool Planet Project Program provides utility business and government customers with education and technical training to measure and manage their energy use and greenhouse gas emissions.

    In 2015, the OCTA produced 84,390 metric tons of CO2e (carbon dioxide equivalent for greenhouse gas emissions) from its day to day activities.  Comparatively, 147,334 metric tons of CO2e was displaced by transit activities in Orange County. Total GHG emission from the OCTA’s operations had a net-positive effect of -62,944 metric tons of CO2e. In Orange County, public transportation directly results in significant reduction in overall GHG emissions.


    Past Years

Get Connected