Most of the rubber that is recycled comes from automobile and truck tires. The EPA says that over 300 million tires are disposed of in America every year. If they end up in a landfill they cause problems because of their bulk and their void space. The empty area inside can trap and hold methane gas that is supposed to be collected and vented out of the landfill. Air or methane inside causes the tires to “bubble” up through the landfill composition. They can also damage the liners placed in some areas of a landfill to prevent ground water contamination.
Tires that are stockpiled or dumped illegally create an eyesore and a breeding ground for mosquitoes and disease carrying vermin. Tire fires can occur easily: burning for months and creating substantial pollution in the air and ground.
Tires account for most of the rubber available for recycling, but not all of it. Shoes, especially sports shoes, often have rubber soles. Rubber is used in construction materials, floor mats for home, industry and automobiles, and inner tubes for bicycles, trailer tires, hand trucks, wagons, etc.