Vehicular Pollution is one of the major culprits in environmental degradation. With rapid urbanization and industrialization of the country, indiscriminate fall out of exhaust sources have ensured suffering of plant life sustaining system. There has been long established use of "green belt" i.e. plants in preventing pollution thereby protecting urban environment from industrial pollution. Since plants are the initial acceptors of pollutants, effects of many air borne particulates from the atmosphere on them cannot be underestimated. This paper assesses the relative sensitivity of four cereal plants: Wheat, Rice, Maize and Oat that are socio economically important plants. The survey is carried out at one of the busiest polluted road of district Saharanpur of Western Uttar Pradesh in India. The samples of four cereal plants of family poaceae were collected from the road side i.e. (20 meter distance away from road side equal to experimental and also away from road side i.e. 200 meter distance away from road side equal tocontrol) at three different stages of growth viz. vegetative stage, flowering stage and at yield stage growing under ambient conditions at the selected sites. For each analysis few individual plants of similar age group having equal height were selected at each site and then dried. Thereafter, various parts were individually mixed, dried and powdered. This powered material was used for analysis of nitrogen and phosphorous content affecting the plants.