By Dr. Shellie L. Rosen, PhD, DOM, L.Ac.
As winter approaches, many people keep windows and doors shut with the heater on, recirculating indoor air without exchanging it for fresh air. This traps pollutants, moisture, and biological particulates inside. Indoor pollutant exposure often exceeds outdoor air quality. Poor air quality is characterized by elevated levels of particulate matter (PM), volatile organic compounds (VOCs) such as from paints, cleaning products, and cooking, allergens such as dust mites and pet dander, and microbes — all of which are linked to various health problems. Air filtration helps.
Chronic exposure to fine particulates and other pollutants triggers low-grade systemic inflammation, oxidative stress, endothelial dysfunction, and autonomic nervous system imbalance, such as heart rate variability. Data from the landmark Harvard Six Cities Study and other large groups show that even small reductions in ambient fine particulates are associated with significant decreases in all-cause mortality and cardiovascular events.
Controlled trials of indoor air purification indicate physiological benefits. For example, using air filters has been linked to reductions in systolic blood pressure (about 5-8 mmHg in some studies) and improvements in measures of vascular reactivity.
Cleaner air allows the body’s detox and repair systems to function without being overwhelmed by pollutants. If you are recovering from infection, surgery, or chronic illness, your immune responses can work more effectively without excessive airborne burdens.
The Environmental Protection Agency states that a high-quality air filtration system can help lower airborne viral and bacterial levels. HEPA filters can effectively reduce the concentration of many respiratory aerosols.
A systematic review by Allergy Asthma Immunol Research in 2021 found that long-term exposure to indoor pollutants exacerbates asthma, chronic obstructive pulmonary disease (COPD), and causes declines in lung function. The review also showed that air filters lowered indoor PM levels and helped asthmatic patients. Removing particles from the air directly lessens allergenic burdens (dust mites, pet dander, mold spores) and reduces symptoms like sneezing, nasal congestion, and airway hyperresponsiveness. Air pollution is increasingly seen as a risk factor for neuroinflammation, microvascular damage, and even accelerated cognitive decline. Clean indoor air helps reduce that ongoing “neural stress load.”
Home improvement projects, indoor pets, and viral illnesses during holiday gatherings increase airborne pollutants indoors. Using air filtration support, especially in rooms where you spend long periods, can make a noticeable difference in risk and symptom burden. Aim for HEPA-certified filters with activated carbon to trap gases and odors. The device’s size and airflow rating must match the room size. A small unit in a large room will be ineffective. Be sure to change filters as recommended and extend their lifespan by running them when windows and doors are closed. Get outside whenever possible to enjoy sunshine and fresh air. Abundant blessings on your fresh air this holiday season!
