The types of harmful environments studied here included bars, video parlors, horse race betting, pornographic movies, and telephones clubs. There was a higher tendency for male junior high school students to be exposed to harmful environments than male senior high school students. Among the younger sample, there was a strong relationship between contact with harmful environments and delinquent or near- delinquent behavior that appeared to weaken among the older sample of boys, probably due to developmental maturity. While the girls in the sample had less contact with harmful environments, those who did tended to engage in near- delinquent behavior more frequently than the girls who had no contact with these environments. 7 tables