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Argonne National Laboratory Research Engineers Danny Bocci (left) and Forrest Jehlik (right) with Circle Track Editor, Rob Fisher, in the background. On-board is the Sensors, Inc. SEMTECH DS portable emissions measurement system (PEMS). This system allows for modal measurement of criteria emissions (NOx, CO, HC), CO2 and fuel consumption, and pertinent environmental conditions (temperature, pressure, humidity). In addition, the unit has an analog data channel and CAN communication inputs, as well as GPS capability.