State, regional, county, and local governments are developing and implementing plans to counterbalance the impacts of climate change. As part of the California Air Resources Board scoping plan developed in response to Assembly Bill 32 (landmark greenhouse gas legislation), California encourages, but does not require, cities to develop jurisdictional-specific Climate Action Plans. One task in developing these plans is quantifying the contribution of the transportation sector that each local community should either take responsibility for or attempt to affect through its local jurisdictional planning. As local Climate Action Plans around the country continue to develop and new plans are initiated, efforts to more rigorously quantify and analyze city-level transportation emissions will grow in importance. This paper describes a step in that direction by presenting a methodological approach for quantifying the contribution of the on-road transportation sector that takes advantage of the analytical framework offered by activity based travel models. By applying this approach in several locations in the San Francisco Bay Area, this practice illustrates the method and suggests the broad applicability for its potential uses elsewhere.
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