Cardiovascular Effects of Aerosols in Residences Study

"Two HEPA filters will be placed in participant's homes (one in the bedroom and one in the main living area); each HEPA will run for 2 consecutive 7-day sampling sessions. During one of the 7-day sampling sessions, the HEPA filter will run without the internal filter in place (i.e., placebo filtration)."

for one of the two 7-day sampling sessions, both HEPA filters placed in participants' homes will be run without the actual filter in the housing unit.