The world's busiest airport plans to roll out a long-awaited step in its environmental efforts by requiring concessionaires to go Styrofoam-less and to use compostable materials starting in October.

The materials concessionaires use will have to be certified by the Biodegradable Products Institute or accepted by Cedar Grove Composting.

Some concessionaires have already stopped using Styrofoam, while others will need to convert their materials by the deadline.

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The expansion to one section of Concourse D, historically Hartsfield-Jackson Atlanta International Airport's narrowest and most cramped concourse, is now complete. The $1.4 billion project, led by the airport and Atlanta-based Delta Air Lines, promises to completely remake the concourse in the world’s busiest airport. (Miguel Martinez/AJC)

Credit: Miguel Martinez-Jimenez

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The city of Atlanta opened Azalea Fresh Market downtown to help residents find affordable groceries. (Natrice Miller/AJC)