Which is the largest MSW component in the United States by mass?

Which is the largest MSW component in the United States by mass?

• A. Paper and Cardboard
• B. Food Waste
• C. Plastics
• D. Metals

Answer: (A)

Understanding waste composition by weight shows why paper and cardboard typically make up the largest share of municipal solid waste in the United States. A huge portion of waste comes from packaging and printed materials—corrugated cardboard boxes from shipping, office papers, newspapers, magazines, junk mail, and other paper products. That combination adds up to a very heavy stream, because paper is dense and generated in large volumes from both households and businesses. Plastics, while abundant, usually contribute less weight overall because many plastic items are lighter than a similar-sized paper product, and even though plastics are widespread, their mass in the waste stream is still often less than that of paper and cardboard. Food waste and yard trimmings can be quite heavy, but in many years the total weight of these organics is smaller than the heavy packaging and paper stream. Metals exist in the mix as well, but their overall mass is smaller due to lower quantities despite their density. So, the dominant factor is the sheer amount of heavy paper and cardboard generated from packaging and printed materials, which makes it the largest MSW component by mass.

Understanding waste composition by weight shows why paper and cardboard typically make up the largest share of municipal solid waste in the United States. A huge portion of waste comes from packaging and printed materials—corrugated cardboard boxes from shipping, office papers, newspapers, magazines, junk mail, and other paper products. That combination adds up to a very heavy stream, because paper is dense and generated in large volumes from both households and businesses.

Plastics, while abundant, usually contribute less weight overall because many plastic items are lighter than a similar-sized paper product, and even though plastics are widespread, their mass in the waste stream is still often less than that of paper and cardboard. Food waste and yard trimmings can be quite heavy, but in many years the total weight of these organics is smaller than the heavy packaging and paper stream. Metals exist in the mix as well, but their overall mass is smaller due to lower quantities despite their density.

So, the dominant factor is the sheer amount of heavy paper and cardboard generated from packaging and printed materials, which makes it the largest MSW component by mass.