Existing contaminant monitors are examined, such as source or stack gas and portable monitors, that are applicable to measurement of recirculated exhaust air. For industrial environment and ambient air measurement, comparison is made of required measurements, measurement levels or standards, and analytical techniques (chemiluminescence, colorimetry, coulometry, conductivity, gas chromatography-flame ionization detection, gas chromatography-flame photometric detection, nondispersive infrared absorption, colorimetric/wet chemical detection, etc.). Finally, problem areas in selecting monitors are identified and suggestions are offered regarding the acquisition and use of a monitoring system.
Recirculation of Exhaust Air, Division of Physical Sciences and Engineering, NIOSH, HEW Publication No. (NIOSH) 76-186