Formaldehyde usage may be simple and inexpensive, but concerns exist over its toxicity and carcinogenicity. In fact, the European Union has banned its use in certain applications. Formaldehyde is a toxic chemical that is classified as a Group 1 human carcinogen. Largely for these reasons, formaldehyde is being used less and less for decontamination. Gaseous chlorine dioxide is being chosen by many facilities as a safer and more effective fumigation alternative.
Learn more here from a 2011 study that compared six different microbial fumigation methods with the goal to evaluate the biocidal efficacy of alternatives to formaldehyde.