This paper and film provide information on Cholrine Mitigation Tests, conducted at the Department of Energy, Nevada Test Site in June 1990. The statement are directed at the specific field tests conducted and described below, and may not apply to other conditions. One of the components of any Emergency Response Plan, is the mitigation of the release to minimize the harmful effects on people and the environment. Most mitigation techniques are aimed at leak repair, or spill containment at storage facilities, with little field test data available on vapor suppression techiques. In June 1988 Chubb National Foam and Dow Chemical U.S.A. conducted some preliminary field tests using foams on liquid chlorine pools, with positive results. In 1989 Dow started planning this set of field tests conducted in June 1990. The purpose of these tests was to provide further data on the efficacy of aqueous foam and water sprays on suppression of chlorine vapors.