University of California - Davis Mar 30 2026 Breathing in common disinfectant chemicals known as quaternary ammonium compounds, or QACs, may be far more harmful than swallowing them, according to a mouse study led by researchers at the University of California, Davis. The study found significant lung injury at blood QAC exposure levels similar to those measured in humans.  The findings raise questions about whether airborne exposure from disinfectant sprays and cleaning products could