What happens if the O2 levels are too low?

A. CO emissions may decrease.
B. CO emissions may increase.
C. NOx emissions may decrease.
D. NOx emissions may increase.


A. Incorrect. If O2 levels are too low, then CO emissions may increase.
B. Correct. If O2 levels are too low, then CO emissions may increase.
C. Incorrect. If O2 levels are too low, then CO emissions may increase.
D. Incorrect. If O2 levels are too low, then CO emissions may increase.

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