Comment on "Detection of exposed phosgene in household bleach: development of a selective and cost-effective sensing tool" by S. Saha and P. Sahoo, Environ. Sci.: Processes Impacts , 2023, 25 , 1144.

In the absence of an identified source of carbon, the reported formation of phosgene from bleach powder is questioned. Interferences and confounding effects other than those investigated by the authors may have led to artifactual results.