Which of the following is NOT an example of a lifestyle risk factor?

Lifestyle risk factors are behaviors and choices that an individual can control and change, which impact their health. The correct answer indicates that poor air quality is not a lifestyle risk factor because it is an environmental condition that is typically beyond an individual's direct control. This means that while poor air quality can have significant health impacts, it is not a factor that someone can modify through personal choices or lifestyle changes.

In contrast, obesity due to overeating, lack of exercise, and tobacco use are all behaviors or choices that individuals can modify to improve their health outcomes. Each of these factors is linked directly to personal choices about diet, activity level, and habits, illustrating the concept of lifestyle risk factors more clearly. This distinction helps to understand which elements individuals can influence versus those that are environmental and systemic.