Which statement discribes an atomic nucleus

Atomic nuleus is a dense structure present in the middle of atom surrounded by electrons.

Explanation:

Nucleus of atom contains protone and neutrons.

As whole it os positively charged due the presence of protones.

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.