Volpe provided technical support to a National Park Service project to evaluate vehicular emissions in the Santa Monica Mountains National Recreation Area. Air emissions were analyzed using the Environmental Protection Agency MOBILE6.2 emissions inventory prediction model, and noise emissions were analyzed using the Federal Highway Administration Traffic Noise Model. Input data are based on historical data, U.S. Geological Survey data, and recommended roadway speeds. An emissions inventory, location point receiver analysis, and contour analysis are presented for the Santa Monica Mountains National Recreation Area.