set of gas mask s

air alert army art background badge banner bio biohazard black breathe caution chemical collection concept contamination cool creative danger death defence design drawing element emblem equipment filter flat fume gas gradient graphic grunge hazard icon idea illustration industry infection isolated life line logo mask military modern poison pollution poster protection respirator road safe safety security set sign silver smoke soldier stainless steel stencil stripe style symbol template terrorism toxic triangle virus war warning wear web white yellow zone