Carbon monoxide in the atmosphere may have adverse effects upon health, and reduction of emissions of this pollutant may be of importance to an effective air pollution abatement program. Carbon monoxide originates from a variety of sources, and the available control techniques vary in type, application, effectiveness, and cost. The control techniques described herein represent a broad spectrum of information from many engineering and other technical fields. The devices, methods, and principles have been developed and used over many years, and much experience has been gained in their application. They are recommended as the techniques generally applicable to the broad range of CO emission control problems. Many agricultural, commercial, industrial and municipal processes and activities that generate CO are described individually in this document. Various techniques that can be applied to control emissions of CO from these sources are reviewed and compared, and equipment costs are included, also.