Final answer:
Secondary pollutant formation is the process commonly referred to when pollutants and atmospheric compounds interact to create over 100 different chemicals. This occurs when primary pollutants, such as nitrogen oxides and VOCs, react with sunlight, air, or each other.
Step-by-step explanation:
Secondary pollutant formation is the process commonly referred to when pollutants and atmospheric compounds interact to create over 100 different chemicals. This occurs when primary pollutants, such as nitrogen oxides and volatile organic compounds (VOCs), react with sunlight, air, or each other. These reactions result in the formation of secondary pollutants, such as ground-level ozone, which can contribute to the formation of photochemical smog.