Emissions and Air Quality
· Emissions are very low
· Reduces tailpipe emissions of unburned hydrocarbons, carbon monoxide, and particular matter (PM) as shown in Figure 1 · B20 has been shown to reduce PM emissions 10%, CO 11%, and unburned HC 21% · Reduces greenhouse gas emissions · B100 could be more than 52% lower than those from petroleum diesel · Carbon dioxide released from biodiesel combustion is offset by the carbon dioxide isolated while growing the soybeans or other feedstock · B100 reduces CO2 emissions by more than 75% · B20 reduces CO2 emissions by 15% · NOx increase for B100 to be in the 2% to 3% range |
· Carbon dioxide released when ethanol is burned is balanced by the carbon dioxide captured when the crops are grown to make ethanol · Reduces CO2 by 34% compared to gasoline · Reduces greenhouse gas emissions (GHGs) by up to 52% compared to gasoline production and use · Low emissions of CO and unburnt hydrocarbons · Reduces tailpipe emissions · Contains 35% O which results in more complete fuel combustion |
· CNG vehicles produce no evaporated emissions because the fuel system is completely sealed · Burns cleaner due to lower carbon content · Nontoxic which makes it not harmful to soil or water · Natural gas emits approximately 6% to 11% lower levels of GHGs than gasoline · Emits a negligible amount of soot |