The Independent Radiation Monitoring Scheme for Clwyd began its monitoring programme in Clwyd in 1988. This is the third report on the results of the radiation monitoring carried out within Clwyd. It identifies any changes in techniques that have occurred in the last twelve months together with the latest monitoring and analytical data. Samples of air, beach materials, coastal sand and silt, seaweed, meat, fish and milk were taken from various locations within the county. No significant changes were found from the previous two years of monitoring. The levels of radioactivity were within the limits currently being detected throughout the United Kingdom. (author).