Which of the following is considered an environmental risk factor?

Pollution is regarded as an environmental risk factor because it stems from external sources that can adversely affect health. Environmental risk factors include elements in our surroundings that can lead to health issues or worsen existing conditions. Pollution, which encompasses air, water, and soil contamination from industrial activities, vehicular emissions, and other human actions, has been linked to various health problems such as respiratory diseases, cardiovascular conditions, and even certain cancers. Therefore, pollution is an example of an environmental risk factor since it is an external element that can impact public health on a large scale.

In contrast, regular exercise, high blood pressure, and a balanced diet are considered personal health factors. While they significantly influence an individual's overall health, they do not arise from environmental sources. Regular exercise and a balanced diet promote health and well-being, while high blood pressure can be a personal health condition influenced by various lifestyle choices and genetic factors.