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The inspector told me to put the dehumidifier in the crawl space. Keep in mind this is only if you close off the entire crawl space. By closing off I mean building a woody thing to put in the window wells. Or you could but foam insulation (about 1" thick) and cut it to size.
If you go the dehum route the object is to keep all the outside air out and just dehum the air that is down there.
As far as ground gases. Radon is the big one that I have heard talked about. Here's a website to check that out. http://www.epa.gov/iaq/radon/
You can order a kit from them or go to your hardware or home center and buy one. To test for radon isn't expensive. You just hang a cardboard packet from the ceiling in the lowest living level of the house for 10 days and then mail the packet in. They will send you back the test results.
Do you have any water down in your crawl space?
Do you have plastic spread?