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Take a look at "Reducing Hexavalent Chromium Emissions" in December's Products Finishing magazine (hopefully it will be on line at http://www.gardnerweb.com/pf/magazine/latest.html soon if you don't have access to the hardcopy).
I'm not vouching for this technology--I've never seen it, never even heard of it before--but the concept sounds great.
It's a special sealed cover for chromium plating tanks, which, rather than being solid all around, has a membrane window through which hydrogen and oxygen can purportedly escape. The idea apparently being that the gasses can get out without allowing the chrome mists to get out. In addition to reducing emissions, it allows the use of evacuation fans that are extremely small.
There are downsides I'm sure; in fact they list a couple (reduced cooling capacity, air agitation not allowed). But looking at it from a great distance, it sounds tremendously promising.
