Exercising outdoors when air quality is poor can negatively impact the body, in part because the body’s natural air filtration system process is less effective when a person breathes through the mouth, which means that more pollutants reach the lungs. This holds true regardless of the cause of the reduced air quality, whether it’s wildfires, pollen or even periods of heavy traffic.
The Impact of Air Pollution on the Body
Large pollutant particles in the air can cause irritation and discomfort, while small, fine pollutants from sources such as auto exhaust or power plants can penetrate deeply into lung tissue and enter the bloodstream. Exposure to fine particle air pollution, a growing concern due to the increase in large wildfires across the Western United States, has also been associated with cardiopulmonary dysfunctions.
The physiological responses and health risks associated with air pollution include increases in resting and exercise heart rate and blood pressure, ischemia, and asthma, as well as decreases in lung function and oxygen-carrying capacity. Older adults and individuals with preexisting cardiovascular and respiratory conditions are particularly susceptible to the damaging effects of air pollution.
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