The aeris AE2010U Trace Level Ozone (O3) Analyser employs a non-dispersive ultraviolet (UV) absorption to accurately and reliably measure ozone concentrations of parts per trillion (ppt) in ambient air. The aeris AE2010U Trace Level Ozone (O3) Analyser employs a non-dispersive ultraviolet (UV) absorption to accurately and reliably measure ozone concentrations of parts per trillion (ppt) in ambient air. Implementing a selective O3 scrubber and continuously measuring an Ozonated and Reference sample the analyser extends upon the high sensitivity and stability of the AE2010 with the addition of a low noise detector to greatly improve signal to noise.