I'll third the humidifier suggestion. It will help with static buildup (ESD) and make the air easier to breath. You want just enough to cut through and cancel (short out) ESD, but obviously not so much as to make your place a sauna or a tropical jungle. If you have pets, they'll appreciate it too.
You could go out and buy an anti-static floor mat for under your desk and chair, but they can be expensive.
Not wearing socks, and/or making sure they're cotton and not wool or man-made fibers, can help stop the static build-up too.