I’ve written a fair amount here about green roofs, in part because I think they’re a good idea and in part because they are one of the options for roofs mandated by Local Laws 92 and 94. Here’s another reason to like them: An unexpected green roof benefit: purging urban rainfall of practically all microplastics. by Sarah DeWeerdt.
It’s not a huge surprise: filtering water flow – specifically slowing it down to reduce the strain on drainage systems and sewers – is one of the well-known general benefits of green roofs. The fact that they also filter solids in that flow should not be a surprise.
Roof gardens at Rockefeller Center, from the 1930s and still:
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