This study describes the effects of Simulated Acid Rain (SAR) on Growth, Photosynthetic pigments, Flowering, Pollen germination and Yield in Sunflower Plant (Helianthus annuus L., Family - Asteraceae) under natural field conditions and draws attention towards challenges posed by air pollution and acidic precipitation on growth, reproduction and productivity in crop plants and need for development of plant varieties suited to acid rain affected croplands