A study led by Washington University’s Scott VanBommel analyzed Martian dust clinging to Perseverance rover swatches, revealing ultrafine particles as small as 100 nanometers that could pose health risks despite being less abrasive than lunar dust. The findings, published in PNAS on October 27, 2026, inform future Mars mission design and dust mitigation strategies.
For 1,645 Martian days, NASA’s Perseverance rover collected data on dust interactions with spacesuit materials, offering the first direct measurements of ultrafine particles on Mars. The research, published in the Proceedings of the National Academy of Sciences, builds on data from Perseverance’s PIXL (Planetary Instrument for X-ray Lithochemistry) and SHERLOC (Scanning Habitable Environments with Raman & Luminescence for Organics and Chemicals) instruments.
Ultrafine Particles Adhere to Surfaces via Electrostatic Charges
Perseverance’s PIXL instrument detected two categories of particles: fine grains under 2.5 micrometers and ultrafine specks around 100 nanometers. These tiny particles, observed on Teflon and Vectran swatches, remained adhered to surfaces despite the rover’s movement, likely due to electrostatic charges. The electrostatic properties of Martian dust are likely causing it to preferentially adhere to some surfaces,
Knight noted, though the exact mechanism remains unmeasured on the swatches. The study also found that particles on PIXL’s Teflon target and SHERLOC’s Vectran swatch averaged about 2 micrometers, while those on basaltic glass and Teflon swatches ranged down to 100 to 300 nanometers.
Health Risks and Mitigation Strategies
The study highlighted potential health threats from Martian dust’s chemical composition, including perchlorates—salts that disrupt thyroid function—and reactive iron that may damage cells. While brief exposure may not pose immediate danger, prolonged missions could require stricter dust control. A NASA working group on Martian dust convened on February 20 and 27, 2026, and proposed a 0.1 milligrams per cubic meter limit, averaged over 24 hours, for particles under 10 micrometers and missions lasting up to 30 days.
Countermeasures are already in development. An electrodynamic dust shield tested on the Moon in March 2025 uses electric fields to clear lunar regolith from glass and thermal surfaces, and NASA lists several solutions including the suitport, a spacesuit that attaches to the outside of a habitat, and two-room airlocks. The shield, developed at Kennedy Space Center, reached the Moon on Firefly Aerospace’s Blue Ghost Mission 1 lander, marking a step toward practical solutions for lunar and Martian dust challenges.
Lessons from the Rover’s Swatches
The rover carries a set of five samples of spacesuit material, including Teflon and basaltic glass, to assess wear. While larger clumps of dust fell off over time, ultrafine particles clung stubbornly. The larger clumps, the Martian dust bunnies, get shaken off over time,
VanBommel described the pattern in NASA’s release. This suggests materials engineered to shed fine grains could reduce contamination risks. The swatches showed little visible wear after 1,645 Martian days, a finding that contrasts with Apollo-era issues where lunar dust caused microtears and hay fever-like symptoms.
Historical context from the Apollo missions underscores the importance of these findings. Apollo 17 astronaut Harrison Schmitt experienced watery eyes and ongoing throat irritation following moonwalks, as dust contaminated his suit and the lander. NASA engineers have long warned that abrasive particles could fray suit fabrics, risking leaks of heat and air. NASA has a long history of turning challenges into workable solutions and finding creative ways to use the data we have to answer questions beyond what they were originally collected for,
said Lindsay Hays, acting director of the Planetary Science Division at NASA headquarters in Washington. Perseverance offers our engineers and flight physicians data they can utilize to refine current solutions prior to the first American astronauts arriving on Mars.
Additional insights come from Katie Stack Morgan, Perseverance project scientist at JPL, who emphasized the rover’s role as well: Perseverance’s main job is to look for signs of ancient microbial life, but the mission was also designed to help prepare for human explorers. That effort includes technology demonstrations such as MOXIE (Mars Oxygen In-Situ Resource Utilization Experiment) and Ingenuity, as well as the spacesuit samples.
These experiments, combined with the dust study, highlight the rover’s role as a testbed for future human missions.
The research, published in the Proceedings of the National Academy of Sciences, marks a critical step in preparing for human exploration, blending rover data with practical solutions to mitigate dust’s effects. The study underscores the importance of adapting technology for Mars’ unique environment, ensuring future astronauts face fewer hazards than Apollo-era astronauts did on the Moon.