Nowadays, air pollution is a major problem in several countries including India and the number and kinds of air pollutants added to the environment have increased dramatically in the recent decades. Both plants and animals suffer from the hazardous effects of these air pollutants. The prompt detection of plant damage resulting from air pollution is extremely important since plants will often display symptoms of injury before effects are discernible in man. In the present project work, four plants namelyChromolaena odorata (L.) R.M. king & H. Rob, Sphagneticola trilobata (L.) Pruski, Vernonia cinerea (L.) Less. and Tridax procumbens L. were selected and the affects of air pollution on the foliar characters were analysed by comparing the plants growing under air polluted and non- polluted habitats. The results of the study reveal that air pollution significantly alters the morphological, anatomical and physiological attributes of all the four selected plant species.