Many people use strong cleaning products to keep their homes spotless, but those same products can have negative effects on health. New research points to a specific chemical as a concern.
A study published in the journal Environmental Science & Technology suggests that quaternary ammonium compounds, or QACs, are a chemical to avoid. Researchers already knew that exposure to QACs raises the risk for asthma and chronic obstructive pulmonary disease.
Because QACs are not easily absorbed through the skin or gut, scientists wanted to see if breathing them in was a problem. They tested this theory on mice, exposing them to various chemicals including QACs and then checking the levels in their blood.
The team found that when mice breathed in QACs at levels that hurt their lungs, the QACs in their blood were similar to amounts found in human blood. This suggests that breathing in the compounds is far more harmful than swallowing them.
Gino Cortopassi, the lead study author, said, “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.”
Widespread Use and Alternatives
The study authors note that despite evidence of harm, QACs are still used widely. They say a ban on other disinfectants in 2015 and the COVID-19 pandemic increased the use of QACs. Air concentrations of QACs rose during that period.
With one million pounds or more produced or imported each year, QACs are found in many products. These include herbicides, eye drop disinfectants, nasal sprays, mouthwash, and dryer sheets.
Based on the findings, the study suggests it is aerosol products that should be avoided most. Cortopassi said, “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.”
To avoid these chemicals, consumers can look for nontoxic cleaners without harsh ingredients. Products with a Safer Choice label from the Environmental Protection Agency follow specific guidelines. Other labels to look for include Non-GMO Project, B-Corp, and MADE SAFE certified.
The findings may explain why some people feel respiratory discomfort after a day of heavy cleaning. Breathing in QACs could damage lung health and increase the risk of asthma and COPD. The research indicates that harsh products are not necessary for a clean home, and non-toxic options are available.
The study was published on April 11, 2026. The research adds to ongoing scientific discussion about the safety of common household chemicals and their long-term health impacts.
