The study area was confined to the grasslands situated in the vicinity of cement factory, Chunar, Mirzapur District, Uttar Pradesh (24°42’ North latitude and 83°5’ East longitude) dominated by Heteropogon contortus to assess effect of cement dust on biomass and primary productivity of grasslands. The maximum biomass of above ground parts of Heteropogon contortus was recorded 1959.38g/m² (October) on control and 1117.75g/m² (November) on polluted grasslands. The primary productivity was comparatively higher on control than polluted grasslands.