This Small Business Technology Transfer Research (STTR) Phase II project will develop a fully functional, cost-effective, prototype sensor for carbon monoxide and volatile organic contaminants in air. Phase I results suggest that a sensor array based on catalyst-doped, nano-crystalline metal oxide films will provide a marked improvement in detection of contaminants, such as formaldehyde, and thereby upgrade control of indoor air quality. Phase II will develop this sensor technology with objectives of long-term use, low cost, high sensitivity, and sufficient selectivity for commercial applications.<br/><br/>These applications include indoor air quality monitoring, environmental air monitoring, oil refining, chemical manufacturing, automotive emission control systems, and industrial process