Indoor environmental quality (IEQ) may not be the only aspect of a green school, but it is one of the most significant. Advanced environmental instrumentation technology now provides school business officials with tools to measure the factors that contribute to their schools' IEQ. These new devices make it possible to identify the toxic or pathogenic contaminants within a school building and to take immediate corrective action when harmful levels of such contaminants are detected. A clean, green, and healthy school is more achievable with the help of these modern handheld tools and an established program for periodic IEQ measurements.