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Study Finds Disinfectant Chemicals More Toxic When Inhaled
Breathing in common disinfectant compounds may be far more harmful than swallowing them, according to UC Davis research.
Mar. 31, 2026 at 12:18am
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A study led by researchers at the University of California, Davis found that breathing in common disinfectant chemicals known as quaternary ammonium compounds (QACs) may be far more harmful than swallowing them. The study in mice showed significant lung injury at blood QAC exposure levels similar to those measured in humans, raising concerns about the potential respiratory health impacts of airborne exposure from disinfectant sprays and cleaning products.
Why it matters
The findings challenge previous assumptions that QACs don't penetrate the body well and suggest that inhaling these chemicals from sprays and cleaners may be a significant route of exposure. This could have implications for respiratory diseases like asthma and COPD, as well as broader questions about the widespread use of QAC-based disinfectants.
The details
The study found that when mice breathed in QACs at doses that harmed their lungs, the amount of the chemicals that ended up in their blood was similar to QAC levels found in human blood. This suggests that inhaling these compounds from spray cleaners may be one way they enter the human body, contrary to previous beliefs that they don't penetrate well. The researchers observed 100-fold more lung injury and lethality in the mice from inhaled QACs compared to ingesting them orally.
- The study was published on March 31, 2026 in the journal Environmental Science and Technology.
The players
Gino Cortopassi
A biochemist and pharmacologist with the UC Davis Weill School of Veterinary Medicine and the lead author of the study.
University of California, Davis
The institution where the research was conducted.
What they’re saying
“The surprising result of this study was that these compounds, when inhaled, caused 100-fold more lung injury and 100-fold more lethality compared to oral ingestion.”
— Gino Cortopassi, Lead author and biochemist/pharmacologist
“We have to question whether we really want to have all of these QAC-based disinfectant sprays in the environment given their proven lung toxicity in mice.”
— Gino Cortopassi, Lead author and biochemist/pharmacologist
What’s next
The researchers plan to further investigate the potential respiratory health impacts of airborne exposure to QACs, including conducting additional studies in humans.
The takeaway
This study challenges previous assumptions about the safety of QAC-based disinfectants and raises serious concerns about the potential health risks, especially from inhaling these chemicals through sprays and cleaners. The findings could prompt a re-evaluation of the widespread use of these compounds and the development of safer alternatives.
