Read the full story from the American Chemical Society.
Researchers found that scented cleaners can react with ozone indoors to create billions or trillions of invisible nanoparticles that can penetrate deep into the lungs. The pollution forms within minutes and, in some cases, may produce an inhaled particle dose comparable to or greater than standing near heavy traffic.
See also
Boor, B. (2026). Indoor atmospheric nanoparticle formation from scented cleaning products. Healthy Indoor Spaces: Bridging the Microbiome and Chemistry Symposium at the 2026 American Chemical Society (ACS) Fall Meeting, Chicago, IL. https://acs.digitellinc.com/p/s/indoor-atmospheric-nanoparticle-formation-from-scented-cleaning-products-664730