Pollutants Pollutants can also have adverse effects on the body. This is of concern if you exercise outdoors in or near big cities. Some common ones include ozone, carbon monoxide, and sulfur dioxide. The most problematic of these pollutants is ozone, or smog, which is caused by the combination of ultraviolet light and emissions from internal combustion engines. Ozone exposure may impair lung function during cardiovascular exercise.
Carbon monoxide is another common air pollutant that can reduce exercise safety and effectiveness.
This is caused by exposure to crowded freeways or smoke filled rooms. Sulfur dioxide is not a major irritant for most people, but those with asthma or bronchospasms tend to be adversely affected by it. Cardiovascular exercise provides many important benefits that cannot be achieved by any other exercise or activity. However, when enjoying this great form of physical activity, be sure to adhere to these precautions so that your program is not only effective, but safe as well.