Teledyne-API,Inc. designs and builds precision gas analyzers in San Diego, California for use worldwide in ambient, CEMS, and process applications. Teledyne Advanced Pollution Instrumentation, Inc. (TAPI) is a world leader in the design and manufacture of analytical instrumentation for precision gas analysis. Known for Environmental Instrumentation. TAPI offers a complete line of Air Quality Monitoring (AQM) instrumentation, which complies with the Environmental Protection Administration (EPA), European Union (CEN), and other requirements for the measurement of criteria pollutant gases consisting of CO, SO2, NOX, Ozone and others.