The decrease in NOx emissions in the U.S. from 1970 to 2014 can be partially attributed to which of the following?

A) a decrease in the amount of nitrogen in the atmosphere
B) the use of catalytic converters in motor vehicles
C) a decrease in vehicle miles traveled
D) the use of scrubbers in motor vehicles
E) a decrease in the amount of energy consumed


Answer: B

Environmental & Atmospheric Sciences

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Fill in the blank(s) with the appropriate word(s).

Environmental & Atmospheric Sciences