The Science of the total environment
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Methylcyclopentadienyl Manganese Tricarbonyl (MMT) has been shown to be an effective octane enhancer in gasoline. It is presently used in the U. S. in leaded gasoline and in Canada in both leaded and unleaded gasoline. ⋯ Authors of several health assessments on MMT concluded the increase in environmental levels of manganese oxides would be slight compared to the natural background levels of manganese and would present no health hazards. Studies showed that MMT usage had no effect on CO emissions, caused a slight decrease in NOx emissions, and a slight increase in HC emissions. MMT usage caused a decrease in NOx + HC emissions in one test and had no effect in another.