Predictors of airborne endotoxin concentrations in inner city homes

Few studies have assessed in home factors which contribute to airborne endotoxin concentrations. In 85 inner city Baltimore homes, we found no significant correlation between settled dust and airborne endotoxin concentrations. Certain household activities and characteristics, including frequency of dusting, air conditioner use and type of flooring, explained 36–42% of the variability of airborne concentrations. Measurements of both airborne and settled dust endotoxin concentrations may be needed to fully characterize domestic exposure in epidemiologic investigations. ► We studied the predictors of in home airborne endotoxin concentrations. ► We found no correlation between settled dust and airborne endotoxin concentrations. ► Dusting and air conditioner use explain some variability of airborne concentrations. ► Type of flooring explains additional variability in airborne endotoxin concentrations. ► Airborne and settled dust endotoxin levels may be needed to characterize exposure.