The effect of automobile pollution on floral pigments of Caesalpinia pulcherrima Suotz. and Nerium indicum Miq. was studied. A decrease in Anthocyanin content in flowers of plants growing near Agra-Mumbai Road NH-3 was observed. There was 8 to 35% reduction noted in floral pigments. Nerium indicum flowers were found more affected than Caesalpinia pulcherrima.