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Today in cement world many companies started to use alternative materials for cement production. Some of these alternative material have direct and indirect impact on emissions, energy consumption etc. In order to reduce CO2 and other emissions some cement plants intend to introduce granulated blast furnace slag (GBFS) as partial substitution of cement clinker in final product (cement). Increasing of granulated blast furnace slag content lead to decreasing clinker content in slag cement. This will have the effect in the way that we will have to produce/use less clinker for production 1 ton of cement. This information is important because according to the current clinker/cement technology production, most of the CO2 emission is result of decarbonatization of calcium carbonate during the burning process2. Some estimates put the cement industry total as high as 5% of total global anthropogenic CO2 emissions. In this paper will be presented comparison of CO2, NOx, SOx and CO emission in ordinary Portland cement and cement produced by granulated blast furnace slag.