Scientists from the University of California, Riverside and Duke University used simple silicone wristbands to track what people breathe in daily city life. The bands captured plasticizers, the chemicals added to plastics to make them soft and flexible. The team found that exposure was high and steady during normal routines in southern California.
Three plasticizers dominated the exposures. Two are phthalates, diisononyl phthalate and DEHP, which California lists as harmful to reproduction and as cancer risks. The third, DEHT, is a common substitute for DEHP. The finding that DEHT is also widespread means that replacing older phthalates has not reduced overall exposure in the air people breathe.
The study supports a wider pattern seen in other U.S. cities. It suggests that in dense urban areas, people inhale plasticizers each day, not only during special events or near industry. The authors conclude that the effective way to lower these chemicals in air is to reduce how much soft plastic we make and use.
Definitions:
- Phthalates are a family of chemicals used to soften vinyl and many consumer products.
- DEHT is a terephthalate, a newer plasticizer used as a replacement.
- Silicone wristbands act like passive sponges, absorbing airborne chemicals that people encounter through normal activity.
Environmental Research – Silicone wristbands reveal ubiquitous human exposure to ortho phthalates and non ortho phthalate plasticizers in Southern California -2024
Peer reviewed study showing that personal silicone wristbands worn by university students captured widespread exposure to plasticizers during everyday life in southern California. Three compounds, DiNP, DEHP, and DEHT, made up most of the measured mass, indicating chronic exposure and limited benefit from substituting DEHT for DEHP.
UC Riverside News – Airborne plastic chemical levels shock researchers – October 1, 2024
University press release explaining the study’s results in plain language, noting that DiNP and DEHP are on California’s Proposition 65 list and that DEHT, a common substitute, is also prevalent in daily exposure.
Yale Environment 360 – Study Finds Plastic Additives in the Air – October 2, 2024
Brief report highlighting that wristbands detected multiple plasticizers from common products and that several are linked to cancer and birth defects, underscoring the public health relevance.
LAist – Yep, you are probably breathing in plastic chemicals, study finds – October 8, 2024
Local coverage emphasizing that daily urban air contains plasticizers and reviewing the study’s method of using wristbands as passive samplers during normal commuting and campus life.
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