In this study, the reduction factors for FRP (Fiber Reinforced Polymers) proposed by various guidelines from countries including the USA, Japan, Canada, Great Britain, Norway and Europe were obtained to assemble a database of current environmental reduction factors and review their appropriateness. A literature review was also conducted that summarizes recent durability investigations conducted worldwide on various FRP materials under different exposure conditions. These FRP materials include carbon, aramid, glass, and hybrid FRP's. The reduction factors obtained from the results of the recent laboratory studies are compared with those provided by various codes on FRPs around the world. Some of the values obtained from reported experimental work were similar to the values proposed by various guidelines; however, none of the experimental results obtained provided the strength degradation due to the synergistic effect for the different exposures presented.