The present paper deals with the effect of polluted air on the chlorohyll content of mosses, namely Barbula consanguinea Jaeg., Ceratodon stenocarpus B.S.G. and Physcomitrium japonicum (Hedw.) Mitt. growing in the vicinity of National Thermal Power Corporation (NTPC) Unchahar, Rae Bareli. During the course of study it was observed that chlorophyll concentration depends upon the pollution air quality index (AQI), leaf area index, (LAI) and resistance of species towards the pollutants. Among the three studied species B. consanguinea emerged out as most resistant species.