This work conveys the timber assessment of the International Institute for Applied Systems Analysis (IIASA) Forest Study for the former European USSR. Aspects of air pollution, silviculture practices, wood supply and forestry practice are covered. Begun in 1986, the Forest Study has assembled a detailed database of forest resources which have been linked to a matrix-type simulation model. The model generates projections of growing-stock and timber-harvest volumes over time by country, species group and age, making it possible to undertake a general timber-supply assessment. The forest-decline effects caused by air pollutants have been simulated in the model by taking into account depositions, critical loads for air pollutants and resulting damage cycles and growth losses.