['To evaluate the use of relatively low levels of hydrogen peroxide vapour (HPV) for the inactivation of Bacillus anthracis spores within an indoor environment.', 'Laboratory-scale decontamination tests were conducted using bacterial spores of both B.\xa0anthracis Ames and Bacillus atrophaeus inoculated onto several types of materials. Pilot-scale tests were also conducted using a larger chamber furnished as an indoor office. Commercial off-the-shelf (COTS) humidifiers filled with aqueous solutions of 3 or 8% hydrogen peroxide (H'] Do a simple decontamination approach using hydrogen peroxide vapour for Bacillus anthracis spore inactivation?