Toxicologist Warns of Indoor Air Pollution From Cooking, Candles, and Shoes

The air inside homes may be significantly more polluted than outdoor air, with indoor air quality sometimes being up to five times worse, according to toxicologist Dr. Yvonne Burkart. This degradation is often due to inadequate ventilation, a critical factor given that Americans spend approximately 90% of their time indoors.

Unclean indoor air is linked to a range of health issues, from short-term symptoms like headaches and fatigue to long-term risks such as asthma, COPD, heart disease, and even cancer. Vulnerable populations, including children, older adults, and individuals with respiratory or heart conditions, are particularly at risk due to prolonged indoor exposure.

Cooking Emissions

Cooking is identified as a major source of indoor pollution. Heating food releases combustion gases like nitrogen dioxide, carbon monoxide, and formaldehyde. Gas and propane stoves, used in an estimated 38% of U.S. households, are significant contributors to nitrogen dioxide exposure. Research suggests these stoves can release particles up to 100 times more dangerous than a car's exhaust pipe, increasing the risk of respiratory illnesses and benzene, a chemical linked to leukemia. Cooking also releases volatile organic compounds and fine particulate matter (PM2.5), which can penetrate deep into the lungs and bloodstream.

Scented Candles

Beyond cooking fumes, common household items like scented candles can also contribute to poor indoor air quality. Studies have linked frequent, long-term exposure to pollutants from low-quality scented candles in enclosed spaces to an increased risk of cellular damage and health complications. Some research suggests candles may emit toxins even when unlit. For those who wish to continue using candles, Burkart recommends opting for natural waxes like beeswax or soy instead of paraffin, ensuring good ventilation by opening windows, and limiting burn times to no more than four hours.

Footwear as a Pollutant Vector

Shoes worn outdoors can track a variety of contaminants into the home, including bacteria, viruses, heavy metals, industrial chemicals, pesticides, and animal waste. Burkart advises a simple solution: removing outdoor shoes at the door to prevent these pollutants from being spread throughout living spaces. She suggests wearing designated indoor slippers or shoes to maintain comfort while keeping the home environment cleaner.