Diesel-powered cars afford some distinct advantages in fuel economy and certain exhaust emissions relative to the conventional Otto cycle engine. Particulate and sulfate emissions from light-duty diesels are two important unregulated emissions for which little is known. Five diesel-powered, light-duty vehicles, a Peugeot 204D, a Mercedes 240D, a Mercedes 300D, a Comprex-equipped Mercedes 220D, and a Perkins 6-247 powered IH pickup, were used to quantify the range of particulate, sulfate as well as other unregulated emissions of odor, visible smoke, sulfur dioxide, aldehydes, and selected non-reactive hydrocarbons. Three transient driving cycles were employed including that used in emissions certification, sulfate testing, and highway fuel economy. Emission rates of particulate, sulfate, and other contaminants of a regulated and unregulated nature are presented in several ways: mass per unit of time, per unit of fuel consumed, and per unit of distance driven. Fuel consumption and economy values are also provided.