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Nitric acid

I have been working with a company that uses a 3% nitric acid solution to
etch film.  The process is currently exhausted to the outside.  They
want to reduce the odor from the process and are trying to determine what
options may be available to them.  They have thought about using an
activated carbon filter.  Has anybody encountered similar situations or
know of other options that may be feasible for this company?

John F. Katers, Ph.D.                                                    
University of Wisconsin-Solid and Hazardous Waste Education Center
2420 Nicolet Drive                                                
Environmental Science 317                                          
Green Bay, WI  54311-7001
Phone (920) 465-2941       FAX (920) 465-2143