Background: Technological environmental pollution has become one of the biggest challenges facing humanity. This type of pollution refers to the harmful effects of technology on the environment. Aim of the study: Was to assess mothers' awareness regarding technological environment pollution and its health hazards on their preschool children. Subjects and methods:  Research design: A descriptive design was used. Setting: Conducting 4 nursery schools in Zagazig city randomly selected. Sample: Sampling contained 212 mothers randomly selected. Tools of data collection: Two tools were used: Tool I: An interview questionnaire composed of two parts to collect demographic data about mother, their children and the mother awareness about technological environment pollution. Tool II:  Health hazards among preschool children scale. Results: 54.3% of the studied mothers had total satisfactory awareness about technological pollution while nearly half of their children had severe concentration and attention problems. A significant negative correlation between the studied mothers` total awareness and the studied children total health hazards Conclusion: More than half of the studied mothers had satisfactory awareness about technological environmental pollution. Also, nearly half of preschool children had severe health hazards. Finally, a statistically negative correlation between mothers' awareness and children's health Recommendations: Implement health education programs for all mothers attending health care settings about technological environmental pollution and its effects on children's health. Replicate this study in other settings to permit generalization.