Abstract
In the Kingdom of Saudi Arabia the city roads and highways have witnessed a phenomenal rise in vehicular traffic in the last 20 years. The atmospheric lead concentration in Jeddah city was found to be 3.38 mu g/m of air in certain heavy traffic areas, and this is higher than the air quality guideline 0.5-1.0 mu g/m for Europe. The present study was undertaken to evaluate the health hazards related to lead in school children in different areas in Riyadh City. The study is essentially an environmental as well as a biological one.