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.