Excessive use of household chemicals for disinfection can pose health risks, according to environmentalist Colleen Marciel Rosales University of California, Davis (USA). The harm of household chemicals was found to be comparable to automobile exhaust, according to the study published in the journal Science Advances. The team of scientists conducted experiments in conditions that fully replicated the offices where regular cleaning is most often done to prevent the spread of the coronavirus. As it turned out, household chemicals can spread fine aerosol particles into the air, which then enter a person's respiratory system at the same rate as exhaust from vehicles. Similar studies have been done before, but specialists were interested in observing the formation of secondary organic aerosols (SOA) under realistic conditions. Such particles are molecules that form as a result of oxidation of several generations of the primary molecule.