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A green roof will filter the air moving across it. A study has shown that 10.76 sf of a grass roof can remove .44 pounds of airborne particulates from the air every year. The typical size of one GRO Module is 4 sf, so it would just take 2.5 GRO Modules accomplish this task. Another study found that 16.15 sf of grass roof can produce enough oxygen to supply one human with their yearly oxygen intake requirement. This is the equivilent of 4 GRO Modules.

The modules also filter pollutants that are transported down from the atmosphere by rain drops. If these great benefits can be had with just a few GRO Modules, think of the ramifications of having a whole roof full of modules, or a whole city full of green roofs!