Being overweight may make asthmatic children more vulnerable to pollution
From American Academy of Allergy, Asthma & Immunology:
Minority and low income populations have high rates of both obesity and asthma morbidity. These same populations also have a greater exposure to indoor pollutants, including microscopic airborne dust particles produced by cigarette smoke, cooking, sweeping, and traffic. This type of pollution is referred to as fine particulate matter (PM) and causes asthma symptoms. Another type of pollution, nitrogen dioxide (NO2), is produced by gas appliances, found in higher concentrations in urban homes, and also associated with asthma symptoms. Because overweight children breathe in higher volumes of air than normal weight children, their lungs may have more exposure to pollutants, thereby putting them at greater risk for asthma symptoms caused by pollutants. Read more.