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NVTC tells Fairfax committee transit avoids roughly 120,000'160,000 metric tons of CO2 a year; buses still climate-competitive
Summary
Xavier Harmony of the Northern Virginia Transportation Commission told the Fairfax Transportation Committee that transit in the region avoids an estimated 120,000'to'160,000 metric tons of CO2 annually, highlighted commuter services'outsize climate impact, and recommended short'term actions to boost ridership and reduce deadheading.
Dr. Xavier Harmony, senior program manager at the Northern Virginia Transportation Commission, told the Fairfax County Transportation Committee that transit in the region prevents an estimated 120,000 to 160,000 metric tons of CO2 each year.
"We estimated that's about 120 to 160,000 metric tons of CO2 annually," Harmony said, explaining that the range reflects use of two different data sources and methods. To help residents visualize the numbers, he translated the savings into familiar equivalents: millions of gallons of gasoline avoided, tens of thousands of cars off the road for a year, and thousands of households of annual energy use.
The presentation emphasized that commuter rail and commuter buses produce disproportional climate benefits compared with their ridership share because longer trips displace more driving. Harmony noted, for example, that commuter rail accounted for about 0.5% of regional transit ridership in fiscal 2022 but roughly 9% of avoided CO2 in the study.
Harmony also addressed vehicle-fuel tradeoffs. "All bus fuel types, even diesel buses, are a much greater environmental option than using cars," he said, adding that a bus does not have to be full to be a better climate option than the equivalent number of cars. He cautioned that increasing electric-car market share will shift the calculus over time, but concluded that diesel buses today remain a net benefit and that jurisdictions have "time to figure this out" when transitioning buses to zero emissions.
The report materials the presenter cited drew regionally from metropolitan data (including a 2017 COG travel survey used for cross'validation) and cover the NVTC area that includes Fairfax, Arlington and Loudoun counties as well as the cities of Falls Church and Alexandria.
Board members questioned data vintage, outreach and short'term tactics. Supervisor Lusk asked why the team relied on 2017 numbers; Harmony said 2017 provided comparable data sources across agencies, and the commission has more recent estimates through 2021 but used 2017 for cross'source validity. Several supervisors requested shareable graphics; Harmony said NVTC has social assets and offered to work with county staff.
The committee did not take formal action on the report. The NVTC study and its methodology are available on the commission's website, and Harmony said staff will provide follow'up materials and answer additional questions from supervisors.
Next steps: committee members and staff said they would use the findings when weighing priorities about increasing ridership, investing in commuter services and planning a longer'term transition to zero'emission buses.
