Researchers at Purdue University have uncovered startling findings about the impact of scented wax melts on indoor air quality. The study reveals that these popular household products produce three times more nanoparticles than traditional candles. The results, published in the "Environmental Science & Technology Letters" journal, indicate that wax melts release nanoparticle levels comparable to those emitted by indoor stoves and diesel engines.
The research team, working in Purdue's zEDGE laboratory, tested a variety of wax melts. They gathered unscented and 14 scented variants, including fragrances like papaya, lemon, peppermint, and bamboo. The facility is designed to mimic home environments and is equipped with advanced machinery for measuring small particles. Their investigation shows that scented wax melts release a higher concentration of volatile organic compounds (VOCs), particularly terpenes, which contribute to nanoparticle formation.
“What we found was surprising—significant formation of airborne nanoparticles that could impact indoor air quality in ways consumers might not expect,” – Jung.
The study challenges the prevailing perception that wax melts are a cleaner alternative to candles. The researchers highlight that manufacturers often do not disclose all ingredients due to a lack of stringent regulations, complicating safety assessments for consumers.
“Unfortunately, due to a lack of stringent regulations, manufacturers are not always required to disclose all ingredients, making it difficult to determine which products are the safest,” – Jung.
This research has garnered praise from experts in the field. Paul Ziemann, PhD, a chemistry professor at the University of Colorado Boulder, commended the study's thoroughness. Similarly, Michael Waring, PhD, a professor of engineering at Drexel University, noted the significance of these findings for indoor air quality and human exposure.
“The findings indicate that nanoparticle formation from wax melts can be comparable to emissions from other strong sources, which is significant for indoor air quality and human exposure,” – Waring.
The study's implications extend to health concerns as well. The formation of nanoparticles and VOCs from wax melts poses risks due to their potential to irritate the respiratory system.
“In the context of health, nanoparticles and VOCs are concerning because they can irritate the respiratory system,” – Boor.
“Airborne nanoparticles have been linked to lung inflammation, cardiovascular effects, and other adverse health outcomes.” – Boor.
Given these findings, individuals with asthma, respiratory issues, or chemical sensitivities should exercise caution when using scented wax melts. Experts advise reducing use in poorly ventilated areas where emissions may accumulate.
“People with asthma, respiratory issues, or chemical sensitivities may want to limit their use, especially in poorly ventilated spaces where emissions can accumulate,” – Jung.
The study calls for further research into the health effects of nanoparticles from scented wax melts. Researchers urge consumers to choose fragrance-free products when possible to minimize exposure.
“A good rule of thumb is to choose products labeled as fragrance-free.” – Jung.
Leave a Reply