CEN/TC 264/WG 18 - Open path optical methods for the measurement of ambient air quality

This European Standard describes the operation of active DOAS measuring systems with continuous radiation source, the calibration procedures and applications in determining gaseous constituents (e.g. NO2, SO2, O3, BTX, Hg) in ambient air or in diffuse emissions.

This European Standard is applicable to open-path absorption measurements of 'concentration  path length' product using the Fourier transform infrared (FTIR) technique with an artificial radiation source. It is applicable to the continuous measurement of infrared active organic and inorganic compounds in the gaseous state in ambient air using fixed tropospheric open paths up to approximately 1 km in length and provides a spatial average.