a process for removal of ethylene oxide from ambient air laden with eo is passed through a zeolite - based removal media , which preferrably consists of the acid form of zeolite zsm - 5 , herein referred to as “ h - zsm - 5 .” the process described herein may be applied to many forms , configurations and uses , such as , for example , gas masks , fume hood ventilation filters , cartridge filters , etc . preferably , the h - zsm - 5 is configured within an apparatus in such a manner that the stream containing eo is brought into sufficient contact with the zeolite to remove the eo from the airstream .