Which of the following is NOT a common pervasive pollutant?

Chlorofluorocarbons (CFCs) are not considered common pervasive pollutants like the others listed. Pervasive pollutants are substances that are widespread and found in various environmental media, affecting air, water, and soil on a broad scale.

Carbon monoxide, hydrocarbons, and nitrogen oxides are commonly found in urban air pollution, primarily from vehicle emissions and industrial processes, leading to widespread environmental and health impacts. They can persist in the atmosphere and affect air quality across large regions.

CFCs, while harmful and significant in terms of their impact on the ozone layer, are not considered pervasive in the same manner. They have become less common due to international regulations such as the Montreal Protocol, which successfully reduced their presence in the atmosphere. While they do exist in certain applications and locations, their general use has significantly declined, differentiating them from the pervasive profile of the other pollutants mentioned.