Litter is any waste material discarded in an open or public space rather than in a proper waste container. That includes obvious items like fast food wrappers and plastic bottles, but it also covers things people don’t always think of: cigarette butts, broken glass, food scraps, and even organic waste like fruit peels. Legally, most jurisdictions define litter broadly enough to include almost anything disposed of improperly, regardless of size or material.
The Most Common Types of Litter
Cigarette butts are the single most littered item on the planet, with an estimated 4.5 trillion discarded annually worldwide. A 2020 study by Keep America Beautiful counted nearly 10 billion cigarette butts as litter in the United States alone, more than the next nine categories combined.
After cigarette butts, the most frequently found items are plastic film (like bag fragments and shrink wrap), food packaging film, broken glass, expanded polystyrene (foam containers and packing peanuts), beer containers, other beverage packaging, food waste, small textiles, and fast food wrappers. Together, these ten categories account for the vast majority of litter picked up along roads, waterways, and urban areas.
What Counts Legally
Laws define litter broadly. In most states, it includes any solid waste, rubbish, refuse, or debris deposited on public or private property without permission. That means tossing a candy wrapper from a car window, leaving a bag of trash on the side of the road, or even dropping a tissue on the sidewalk all qualify. Biodegradable items like apple cores and banana peels are generally considered litter too, because most statutes don’t distinguish between organic and inorganic materials.
The legal consequences scale with the amount. Texas law illustrates a common approach: waste weighing five pounds or less is a minor misdemeanor, while anything over five pounds but under 500 pounds bumps the charge up a level. Waste over 1,000 pounds or 200 cubic feet crosses into felony territory. Dumping for a commercial purpose carries stiffer penalties at lower weight thresholds. In Louisiana, fines for litter violations range from $175 to $1,000, with up to eight hours of community litter cleanup. Other states follow similar patterns, with fines increasing for repeat offenses.
How Long Litter Lasts in the Environment
One reason litter is such a problem is that most of it doesn’t go away on its own. Plastic bags take 10 to 20 years to break down. Plastic bottles last roughly 450 years. Aluminum cans need 80 to 200 years to fully decompose. And some rigid plastic items can persist for up to 1,000 years in a landfill, even longer in open environments where conditions for decomposition are less favorable.
Cigarette butts are a particularly stubborn case. Their filters are made from cellulose acetate, a type of plastic, not cotton or paper as many smokers assume. A two-year decomposition study found that cigarette filters lost only about 38% of their mass over 720 days, and the chemical bonds in the cellulose acetate showed no signs of breaking down during that period. While they slowly degrade, they leach nicotine, heavy metals, formaldehyde, benzene, and other toxic compounds into soil and water.
From Litter to Microplastics
Larger plastic litter doesn’t just sit there. Over time, sunlight and weather break it into progressively smaller fragments. Once those pieces shrink below 5 millimeters (roughly the size of a sesame seed), they’re classified as microplastics. About 60 to 80% of all litter in aquatic and terrestrial environments is plastic, and much of it eventually becomes microplastic pollution. An estimated 20 million metric tons of plastic litter enter the environment each year, according to the International Union for Conservation of Nature, with the vast majority consisting of visible pieces that will fragment over decades.
How Litter Harms Wildlife
Discarded containers are a surprisingly lethal form of litter. A global study cataloging reports from 51 countries found that bottles, cans, and cups act as traps for animals. Across 503 documented cases, roughly 1,050 invertebrates died inside discarded containers, and 496 vertebrates were found trapped in them. Animals pulled from containers alive frequently had open wounds, swelling, dehydration, or breathing problems.
The scale is likely much larger than individual case studies capture. One estimate suggests 2.9 million small mammals, including mice, shrews, and voles, die in discarded containers in Great Britain each year. On remote Pacific islands, researchers estimated a combined mortality of half a million hermit crabs from beach litter. Beyond trapping, litter injures animals through broken glass, entanglement in plastic rings and bags, and ingestion of materials they mistake for food.
Public Health Risks
Litter isn’t just an eyesore. Accumulated waste along roads and in urban areas creates genuine health hazards. Cigarette butts leach heavy metals, nicotine, cyanide, and carcinogenic compounds into soil and groundwater. Standing water in discarded containers breeds mosquitoes. And infectious litter became a documented concern during the COVID-19 pandemic, when discarded masks and gloves on sidewalks and beaches raised the risk of disease transmission and introduced a new wave of microplastic pollution into waterways.
The leaching problem is especially significant in areas with high litter density. Toxins from cigarette filters and degrading plastics seep into the ground during rainstorms, eventually reaching streams and groundwater supplies. In urban environments, heavy litter accumulation has been linked to both soil contamination and reduced property values, compounding the health and economic effects on surrounding communities.