2. Greasy pizza boxes
Pizza boxes are among the most common offenders when it comes to contamination, waste managers say. The problem is that oil often seeps into the cardboard. The oil cannot be separated from the fiber, making that material less valuable, and less marketable, to buyers.
But that’s not to say you can never recycle a pizza box, said Marjorie Griek, executive director of the National Recycling Coalition, which promotes recycling in the United States. “If you’ve got a few crumbs in there, that’s not an issue,” she said.
Pizza boxes with “small amounts of grease” are O.K. to recycle in New York City, a sanitation department spokeswoman said. If the grease seeps through the cardboard, the box should be put in a composting bin or thrown out, she said.
Remember, there are also two sides to a pizza box. If there’s a side that’s not oily, tear that off and recycle it.