The key component of smog is

Question

Quizplus · Accepted Answer

While all of the listed components can contribute to smog, ground-level ozone is the key component. This is because it is the pollutant that has the greatest impact on human health and the environment. Ground-level ozone is formed when pollutants like nitrogen oxides and volatile organic compounds react in the presence of sunlight, and it can cause respiratory problems, damage crops and trees, and contribute to climate change. Particulate matter, sulfur dioxide, and carbon monoxide are all also important elements of smog, but they have different sources and impacts than ground-level ozone.

The Key Component of Smog Is