Abstract: Background and Objective: Cilegon has three industrial zones with different types and capacities of fuel as well as the height of different stack. The amount of fuel capacity and the height of the stack used, it is estimated that air pollutants emitted to outside the industrial area. The aim of research was to estimate polluted air polluted area in Cilegon. Materials and Methods: Researchers used the analysis of climate data, emission debit, concentrations and dispersion distance of pollutants in the industrial area, while to know the dispersion is measured in several villages in Cilegon. Concentration analysis and spreading distance of air pollutants were used Screen3 software produced by US-EPA, while the estimation of the distribution used continuity equation. Results: The result of climate data analysis shows that Cilegon atmosphere stability between extremely unstable until slightly stable. Furthermore, the results of the Screen3 analysis show that at extremely unstable stability the spreading distance of air pollutants is still in the vicinity of the industrial area, whereas the moderately unstable stability until slightly stable spread out to the industrial area. Conclusion: Meanwhile, the result of equation continuity analysis within four periods in 3 month shows the different dispersion pattern. From the six emitted air pollutants, the concentration of air pollutants continues to increase i.e., sulphur dioxide (SO2). In four analysis periods, SO2 concentrations got increased from 5.41-19.59 μg m–3. Tamansari Village, Kubangsari and Kepuh are polluted villages of air pollution.