Pollution is a major problem across the United States. More than half of all Americans live in areas with unhealthy levels of outdoor smog or particle air pollution, according to a study by the American Lung Association. In addition, indoor air pollution such as secondhand smoke and combustion byproducts can present health risks.

Pollution can be especially dangerous for those who have allergies, asthma and other respiratory disorders. The irritants in pollution can easily trigger symptoms of an allergic cascade or asthma attack.

Individuals have little control over the amount of pollution in the atmosphere. However, those with illnesses sensitive to pollution levels can take several smaller steps to control their exposure to both indoor and outdoor irritants.