Air Pollution and Cardiovascular Disease in Qatar: an Interventional Study to Reduce Blood Pressure

Inclusion Criteria: * Age ≥18 and less than 65 years old * Living in a single residence (home, apartment) located anywhere in Qatar * Mild systolic hypertension: screening visit systolic BP 130 to 159 mm Hg (off treatment or taking ≤ 2 BP medications that have been stable without changes during prior one week) * Either: Type 2 diabetes patients (HbA1c \> 6.5%) OR Non-type 2 diabetes patients with two or more additional criteria for the metabolic syndrome, * Waist circumference ≥102 cm if male and ≥88 cm if female * Fasting triglycerides ≥150 mg/dL (or taking a triglyceride-lowering medication) * HDL-C ≤ 40 mg/dL if male and ≤ 50 mg/dL if female (or taking an HDL-raising medication), * Fasting glucose ≥100 mg/dL (or taking an antidiabetic medication) Exclusion Criteria: * Pregnancy (self-reported) * ≥stage 4 kidney disease (estimated glomerular filtration rate \<30 ml/min). * A medical condition placing the participant at risk from participation (per investigators) * Expected overnight travel outside their residence during the study * HEPA filter within the ACs of the residence (self-reported) or individual use of HEPA filter filter * Unable to comprehend/sign an informed consent * Lung disease requiring oxygen * Cancer receiving treatment. * Type 1 diabetes or MODY diabetes * Screening visit: BP ≥160/100 mm Hg * Medication changes in the past week. If participants are on medications for high BP or hyperlipidemia, they will need to have had stable therapy for at least one week with no planned changes during the study * Left upper arm circumference \>17 inches as this will make BP levels inaccurate with the home monitor used * Acute illness or infectious symptoms within the prior 4 weeks.