Inclusion Criteria:

• * Nonsmoker
• * ≥60 years old
• * residing in Carpenter Place Apartments

Exclusion Criteria:

• * Active cigarette smoker
• * daily secondhand smoke exposure (self-report)
• * any CV event (myocardial infarction, stroke, heart failure, revascularization) in the past 3 months
• * unstable CV condition or risk factor (uncontrolled diabetes, class 3-4 angina or heart failure) or any medical condition that would place the participant at risk from participation or jeopardize study integrity (per investigators)
• * expected overnight travel outside their apartment during the 14-week study period
• * unable to provide informed consent
• * lung disease requiring oxygen
• * renal dialysis
• * cancer receiving active treatment or chemotherapy
• * severe uncontrolled high BP ≥160/100 mm Hg or SBP\<115 mm Hg.
• * CV medication change in the prior month. If participants are on medications for high BP, diabetes, or a CV condition, they will need to have stable therapy during the prior month with no planned changes during the study period.