Which of the following is a type of wave that does not need a medium though which to travel? A.) equilibrium
B.) longitudinal
C.) amplitude
D.) transverse​

The answer is D) Transverse

Explanation:

Electromagnetic waves which are in transverse (by nature) can travel withought a medium.

significant amounts of nitrogen oxides, carbon monoxide, and other pollution

explanation:

passenger vehicles are a major pollution contributor, producing significant amounts of nitrogen oxides, carbon monoxide, and other pollution. in 2013, transportation contributed more than half of the carbon monoxide and nitrogen oxides, and almost a quarter of the hydrocarbons emitted into our air.