The enzymes succinate dehydrogenase and peroxidase were localized histochemically in the leaf epidermal cells and in the young stems of:Annona squamosa L.,Coccinia indica W. and A.,Bougainvillea spectabilis Willd.,Azadirechta indica L.,Ficus benghalensis L.,Lantana camara L. var.aculeata, Mangifera indica L.,Manilkara hexandra (Roxb) Dub.,Streblus asper Lour,Syzygium cumini L.,Tamarindus indica L., andZizyphus oenoplia L., from the areas around the Gujarat State Fertilizer Company, near Baroda (22°−30′ N latitude, 73°−60′ E longitude), and nearly-normal area of Vallabh Vidyanagar (22°−50′ N latitude, 73°−10′ E longitude). The soil types, temperature, rainfall, humidity and agricultural patterns of the two localities are identical. Intensities of enzyme activity vary in different cell types of the epidermis and in various tissues of the stem. Intensities of succinate dehydrogenase and peroxidase in epidermal cells is low in majority of the pollution-affected plants. Except inAzadirechta indica andManilkara hexandra, stem of all the other pollution-affected species showed lower succinate dehydrogenase activity than in the normal. Vascular parenchyma in the stems of pollution-affected plants ofAzadirechta indica andManilkara hexandra showed high succinate dehydrogenase activity than that in the normal, whereas in extravascular regions it is almost identical with that of the normal stem. Peroxidase activity in the stem of pollution-affected plants ofManilkara hexandra andStreblus asper is higher than that in normal, and in rest of the species it is lower than or almost the same as in the normal.