Comparative studies were conducted in the current investigation to determine the impact of air contaminants produced by the exhaust of automobiles and industries on the chrorophyll content of leaves. The leaves of Azadirachta indica, Nerium oleander, Mangifera indica, and Dalbergia sissoo were collected from regions with potentially higher and reduced levels of air pollution. Chlorophyll a, chlorophyll b, and carotenoids were used to quantify photosynthetic pigments. A decrease in the photosynthetic pigments of plant foliage that are planted in more polluted areas as opposed to those that are not or are less polluted.