Pollution. Air pollution. Colorado. Pueblo First federal clean-air lawsuit filed; accused CF&I FUEL IRON Steel Corporation of violating Colorado air quality regulations. RMN Jy 3, 1976 p.6 Post Jy 3, 1976 p.3 State board approves changes in CF&I control emissions plan. RMN N 19, .1976 p.6 Workers at CF&I Steel Corp. being exposed to harmful toxic dusts, despite clean outside air awards. RMN Mr 9, 1980 p.4 EPA official calls Pueblo CF&I Steel Corp. plant a model facility, denies pollution charges. RMN,d%, Mr 10, 1982 p.8