Teledyne-API (TAPI) designs and builds precision air quality monitoring instruments at our factory located in San Diego, California, USA. Our products are used worldwide in ambient air quality monitoring systems (AQMS), continuous emissions monitoring systems (CEMS), and industrial process applications. Our analyzers comply with United States Environmental Protection Administration (EPA), European Union (EN), and other global regulatory agencies for the measurement of criteria pollutants including NOX, SO2, CO, O3, PM10 & PM2.5, among others. We also provide a variety of precision Zero Air Generators and Calibrator instruments for both standard and trace-level applications.