Greenguard is a certificate offered by UL Environment. The role of Greenguard is to show a product has kept a threshold of limited chemical emissions. The Greenguard test is designed to replicate the products use in its environment. The emissions tested for, include: formaldehyde, volatile organic compounds, and other air contaminants. The label is typically used for flooring, paint, doors, windows, and furniture. UL also offers Greenguard Gold, which includes an even lower amount of chemical emissions. If a product qualifies for the Gold standard it's to be displayed at the bottom of the logo, also at the bottom of the logo you'll see the letters UL and a number code, these are referring to a specific certification.
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