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City of Pleasanton <br />GHG Inventory, Forecast, and Targets Methodology and Calculations <br /> <br />18 <br />Table 8 Estimated On-Road Transportation Emissions for 2017 <br />Source <br />Activity Data <br />(VMT)2 Emission Factor <br />Total Emissions <br />(MTCO2e) <br />Internal-Internal Daily VMT 217,216 0.000445 MT CO2e per VMT 97 <br />½ Internal-External Daily VMT 472,942 0.000445 MT CO2e per VMT 210 <br />½ External-Internal Daily VMT 1,032,616 0.000445 MT CO2e per VMT 459 <br />Total Passenger Daily VMT 1,722,744 0.000338 MT CO2e per VMT 522 <br />Total Adjusted Passenger Daily VMT3 1,732,827 0.000338 MT CO2e per VMT 582 <br />Total Commercial Daily VMT 255,776 0.001366 MT CO2e per VMT 349 <br />Total Adjusted Commercial Daily <br />VMT3 <br />267,248 0.001366 MT CO2e per VMT 365 <br />Yearly Passenger VMT1 601,291,074 0.000338 MT CO2e per VMT 202,946 <br />Yearly Commercial VMT1 92,735,039 0.001366 MT CO2e per VMT 126,668 <br />Yearly VMT1 694,026,113 .000852 MT CO2e per VMT 329,615 <br />MT CO2e: metric tons of carbon dioxide equivalent; VMT: vehicle miles traveled <br />1 Weekday to annual conversion of 347 is used per CARB guidance on VMT modeling <br />2 The origin-destination methodology for VMT calculation attributes 100 percent of internal to internal daily trips, 50 percent of <br />internal-external and external-internal daily trips and excludes all pass-through trips. This sum is then multiplied by 347 to get an <br />annual VMT number. <br />3 Motorcycle, motor homes, and bus VMT not included in original data, and were estimated based on average prevalence of these <br />vehicles in Alameda County, which is approximately 1 percent. <br />Transportation emissions are generated by the community of Pleasanton through on-road <br />transportation, including passenger, commercial, and heavy machinery. Emissions factors are <br />established using the latest CARB and EPA-approved emissions modeling software, 2017 State <br />EMissions FACtors (EMFAC) Model. Carbon dioxide, nitrous oxide, and methane emissions from engine <br />combustion are multiplied by their GWP to determine CO2e per VMT. Emissions for both passenger and <br />commercial vehicles were established using the EMFAC2017 GHG module and weighted by VMT to <br />establish an average emissions factor per VMT for the City. Emissions from electricity used by charging <br />of electric vehicles are captured under the electricity sector. In 2017, the average emissions factor for <br />cars on the road in the County of Alameda was 0.000435 MTCO2e per VMT as calculated using the <br />EMFAC2017 model.43 Technical details on the EMFAC2017 modeling tool can be found on the EMFAC <br />Mobile Source Emissions Inventory Technical Support Documentation Portal.44 <br /> <br /> <br /> <br />43 California Air Resources Board. 2017. EMFAC2017. Base year 2017, County of Alameda model run. Available: <br /><https://www.arb.ca.gov/emfac/>. Accessed: April 5, 2020 <br />44 California Air Resources Board. 2017. EMFAC Software and Technical Support Documentation. Available: <https://ww2.arb.ca.gov/our- <br />work/programs/mobile-source-emissions-inventory/road-documentation/msei-modeling-tools-emfac>. Accessed: April 5, 2020.