Emissions factors quantify the average CO₂ output per unit of energy. They are measured in kilograms of CO₂ per megawatt-hour (MWh) of energy from various fossil fuel sources. By comparison, the average petrol or diesel car is estimated to emit between 39 and 41 tonnes of CO2 from fuel during its lifetime, a conventional hybrid would typically emit more like 33 tonnes. Kg CO 2 per litre of diesel vehicles. Diesel produces 2.6391 kgs of CO 2 per litre burnt. The precise figures depend on the quality of the fuel. Since fuel weighs less than a kilogram per litre, it is interesting to see how the weight of emissions is multiplied by the addition of oxygen. One liter of gasoline weighs 750 grams. Petrol has an 87 percent carbon content, or 652 grammes of carbon per liter. 1740 grammes of oxygen are required to convert this carbon to CO2. The total is 652 + 1740 = 2392 grammes CO2/liter of gasoline. 5 l x 2392 g/l / 100 (per km) = 120 g CO2/km equates to 5 l x 2392 g/l / 100 (per km) = 120 g CO2/km. Collectively, cars and trucks account for nearly one-fifth of all US emissions, emitting around 24 pounds of carbon dioxide and other global-warming gases for every gallon of gas. About five pounds comes from the extraction, production, and delivery of the fuel, while the great bulk of heat-trapping emissions—more than 19 pounds per gallon CO 2 makes up roughly 99% of the total greenhouse gases emitted from the tailpipe. The smog rating reflects the current federal emission standards, which cover: Oxides of Nitrogen (NOx), which combine with hydrocarbons to create smog Particulate Matter (PM), tiny particles of solid matter that lodge in the lungs and deposit on buildings Even before buying the car emissions occurred, corresponding to approximately 5.3 tons and 17.5 tons of Carbon Dioxide. The numbers can be difficult to relate to. As a comparison, a trip for one person round trip from Stockholm to New York by air causes the release of more than 600 kilograms of carbon dioxide, according to the UN organization For diesel fuel, it is 10.21, for jet fuel, it is 9.75 and for biodiesel, it is 9.45. For propane, this figure is again much lower, at 5.72 kilograms of CO2 per gallon. In vehicles, propane engines emit 12% less CO 2 , 20% less nitrogen oxide and 30% less carbon monoxide (CO) than gasoline engines, and they produce 80% fewer hydrocarbon DbNtqy.

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