Question

which of the following pollutants is most commonly associated with poor air quality? carbon monoxide oxygen nitrogen water vapor

Explanation:

Carbon monoxide is a harmful pollutant. Oxygen is essential for life and not a pollutant. Nitrogen is a major component of air (about 78%) and not a pollutant in the context of poor air quality here. Water vapor is a natural part of the atmosphere and not a pollutant related to poor air quality in this sense.

Answer:

Carbon monoxide