THE INTERNATIONAL ORGANIZATION FOR STANDardization, ISO, Technical Committee on Corrosion of Metals and Alloys, TC156, identified atmospheric corrosion as a priority area for the development of international standards during their organizational meeting in Riga, Latvia, in 1976. In the next meeting in Borås, Sweden, in 1978, TC 156 created Working Group 4 (WG 4) to develop standards for the classification of atmospheric corrosivity under the leadership of the Czech Republic's (formerly Czechoslovakia) delegation.