The PROPHET (Program for Research on Oxidants: PHotochemistry, Emissions, and Transport) tower and laboratory are located within a forested area on the University of Michigan Biological Station property. The tower is a 103 feet 5 inch tall, guyed stairway-type tower erected in December of 1996. A glass manifold reaches to 115 feet and delivers air samples to the laboratory for analysis. The Tower lab building is 20 x 30 x 10 feet and is insulated and supplied with heat and air conditioning (two 7.5 ton units). It has telephone and data line service and 3-phase power. The building is furnished with shelving, lab benches and a few computer desks.