Researchers at the University of Texas at Austin report that human hair can record chemical exposure over days, weeks and months because hair grows slowly. The study explains that each hair section represents a period of past exposure and can reconstruct timelines that blood or urine cannot capture.
Anna Neville began the work in a class with Pawel Misztal after testing a lock of her own hair. Heating the strands released molecules that a mass spectrometer identified in real time, and a clear spike of phthalates matched a visit to her parents' house during renovations.
The team paired thermal desorption with a fast mass spectrometer known in the lab as the "sniffer." Analyzing donated hair, they detected more than 1,000 compounds, including phthalates and cigarette smoke residues. The study highlights indoor sources of exposure and suggests practical steps to reduce risks.
Difficult words
- exposure — contact with a chemical or harmful thing
- reconstruct — build a past timeline from evidence
- mass spectrometer — machine that finds chemicals by mass
- phthalate — chemical used in plastics, possible pollutantphthalates
- residue — small amount left after a processresidues
- detect — find or notice the presence ofdetected
Tip: hover, focus or tap highlighted words in the article to see quick definitions while you read or listen.
Discussion questions
- How could hair analysis like this change health checks or exposure monitoring in your community?
- Would you be willing to donate hair for research? Why or why not?
- What practical steps could people take to reduce indoor chemical exposure during home renovations?
Related articles
Mining pressure threatens large areas of the Brazilian Amazon
A study warns that mining for minerals used in clean energy could threaten nearly 363,000 square kilometres of the Brazilian Legal Amazon. The area is mostly forest and is home to many indigenous people and quilombola communities.
Eclipse project increased people’s connection to science
A public participatory science project linked to the 2024 total solar eclipse showed that witnessing awe-inspiring events can raise people’s sense of science identity and belonging. Volunteers recorded animal behaviour and completed surveys.
