Answer
(a)
Work Step by Step
Nitrogen oxides ($NO_x$) are reduced by catalytic converters in vehicles, which convert $NO_x$ into nitrogen gas ($N_2$) and oxygen.
The answer is (a).
Environmental Science for AP* (2nd Edition)
by Friedland, Andrew J.; Relyea, Rick
Published by
W. H. Freeman
ISBN 10:
1464108684
ISBN 13:
978-1-46410-868-6
Chapter 15 - Module 48 - Pollution Control Measures - AP Review Questions - Page 537: 1
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