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Air-Cleaning Drywall. Last year's news was full of stories about defective Chinese gypsum board making people sick. Now CertainTeed has come out with a drywall it says actually improves indoor air quality. Rather than off-gassing formaldehyde and other VOCs, the company says, AirRenew Gypsum Board removes these chemicals from the air and converts them to inert compounds. The product also allegedly resists moisture damage and mold intrusion. It costs 10 percent to 15 percent more than standard gypsum panels. CertainTeed Corp., 800/233-8990, airrenew.com