The feasibility of an instrument for the measurement of aiborne lead was demonstrated under Phase I and subsequent research. The objective of the phase Ii program described herein is to develop an adaptable optimum instrument head configuration for the airborne lead monitor. The objective will be met with a program that features a combination of simulation and verification, in an interactive process. The test components will be delivered at the end of the program, along with a copy of a proprietary analytical software package and operating manuals. The delivered hardware and software, plus a personal computer, will constitute a working system, with which the Government can perform field surveys of airborne lead concentration, and develop experience to guide future instrument development.