Which of the following is an uncontrollable environmental risk factor?

Air pollution is indeed considered an uncontrollable environmental risk factor because it is not something individuals can manage or influence directly. It is determined by various external factors such as industrial activity, vehicle emissions, and natural events, all of which contribute to the air quality in a given area. Since individuals cannot change these external conditions, exposure to air pollution can have significant health impacts over time, including respiratory issues and other chronic health conditions.

In contrast, the other options listed—regular health screenings, daily exercise, and healthy eating—are all controllable behaviors or practices that individuals can choose to engage in or modify. Regular health screenings allow individuals to monitor their health proactively, while daily exercise and healthy eating are lifestyle choices that can have a direct positive impact on overall health. By focusing on maintaining these controllable factors, individuals can mitigate some of the risk factors associated with their environment, unlike the unavoidable nature of air pollution.