A relationship in which one organism is helped and another organism is neither helped nor hurt is called

Commensalism

Explanation:

Commensalism is when one organism is helped while the other is neutral (neither hurt nor helped).  Example: clownfish and anemone.

looks like youre on your own with this one buddy

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.