This study provides an overall assessment of the air environmental effects of co-incineration of waste plastics and coal on field-scale cement plants. Two different types of waste plastics, i. e., densified refuse plastic fuel (RPF) and fluff refuse plastic fuel (fluff RPF), were fed into cement kilns to evaluate the emission characteristics of odor, particle and gas phase air pollutants, and dioxin in exhaust gas. The observed results revealed that the emissions of air pollutants were not significantly influenced by the presence of waste plastics in cement kilns, whereas the emission of dioxin seems to increase by feeding wastes to the kiln. The concentrations were however lower than 0.1 ng-TEQ/Sm3 of emission standard for cement kiln. Feeding types of waste plastics made little difference of the emissions of air pollutants in kilns.