Environmental pollution is now increasingly recognized as a major threat to social and economic development and even to human survival. Environmental education [EE] increases public awareness and knowledge of environmental and health issues and challenges. There is now an advanced placement course for environmental science in Egyptian schools. The present study aimed at measuring the extent of some environmental health knowledge among children in some preparatory schools. Knowledge of environmental health was assessed in a sample of 400 students at four preparatory schools. The questionnaire sheet included information about the social status of families of students, school environment as perceived by students, and some important essential environmental health knowledge. A sizable rate of students' families of language schools [100%] and of the governmental school [over 75%] scored high and middle social status. The students critically assessed their schools giving rates of bad standard ranging from 6-11%. The overall results of responses of students on the effect of presence of environmental pollutants on their health were poor, where 67-80% of students scored low. When relating knowledge of students to the social level of their families, it revealed a poor relation. An important recommendation is that theoretical subject matter in schools must be strengthened by practical training. Parents association in schools should be provided by educational materials aids to help their reference information to their children.