Our flagship wearable sampler. Collect filter-based air samples on to 37 mm filter media along with extensive sensor data to inform you on motion, compliance, environmental factors, particulate matter, carbon dioxide and tVOC and NOx. Access Sensor Technologies’ UPAS is a compact, filter sampler built around ultrasonic pumping technology. The UPAS is smaller, lighter, quieter, more affordable, and easier to use than conventional air sampling equipment.