Can disinfectant sprays with quaternary ammonium compounds irritate your lungs?

What's actually in it

Many disinfectant sprays and wipes use quaternary ammonium compounds, also called quats. Two common quats are benzalkonium chloride (BAC) and didecyl dimethylammonium chloride (DDAC).

These ingredients kill germs on surfaces. The concern is exposure route. When a product is sprayed, small droplets can hang in the air. That makes it easier to breathe the cleaner into your lungs.

What the research says

A 2026 study in Environ Sci Technol tested BAC and DDAC in mice. The researchers compared lung exposure with oral exposure.

The study found that aspirated quats caused much more harm than swallowed quats. In mice, lung exposure caused 100-fold more lung injury and lethality than oral dosing. DDAC caused more injury than BAC. The doses that injured lungs also produced blood levels that overlapped with levels measured in people.

This does not mean one quick spray will damage your lungs. It does mean sprays deserve caution, especially with repeated use or poor ventilation. People with asthma, kids, and cleaning workers may have higher exposure.

Use disinfectants only when you need to kill germs, not for everyday dust or crumbs. When you do use them, open a window, avoid breathing mist, spray onto a cloth when the label allows it, and read labels for BAC, DDAC, and other quats.