formaldehyde (methanal) molecule. important indoor pollutant

formaldehyde formaldehyd formol formalin formaline aldehyde indoor pollutant cancer carcinogenic inhalation lung toxic poison paraformaldehyde methanal disinfectant preservative trioxane methanol resin biocide vaccine methenamine fixative embalming carbon hydrogen oxygen molecule atoms atomic model molecular compound composition chemical chemistry bond structure formula blackboard chalkboard chalk written writing drawing background ring line skeletal flat icon stylized style