Environmental impact of Mardi Gras beads

Bead composition

Polyethylene and polystyrene are common plastics in Mardi Gras beads. Polystyrene can last decades in landfills before slowly oxidizing via UV light, while polyethylene does not decompose with UV radiation and biodegrades extremely slowly. Lead, cadmium, and other elements have been detected at levels far exceeding safety limits; some beads contain lead more than 300 times the Consumer Product Safety Commission's safe threshold of 100 ppm, posing risks especially to children who may mouth the beads.

Entry into the environment

Beads enter storm drains that empty into Lake Pontchartrain and the Mississippi River, eventually reaching the Gulf of Mexico. The metals they carry cause high mortality and increased metal biomass in fish within a month of exposure. Beads tangled in trees release lead via rainwater into leaves and soil, where lead inhibits cell division, water uptake, and photosynthesis, potentially killing plants. Seafood from the Gulf, a staple of the south Louisiana diet, can become contaminated with lead and cadmium.

Impact on humans

Lead exposure significantly impairs neurological function. A study of identical twin painters found bone lead levels 5–10 times the adult average; the twin who removed paint had 2.5 times higher lead concentration and markedly worse memory. Cadmium is carcinogenic through interactions with DNA topoisomerase IIα, an enzyme involved in cell division and DNA repair. Cadmium cations react with sulfur-containing thiol groups in cysteine residues, disrupting the enzyme's structure and function.

Solutions

Alternatives to current beads include polylactic acid (PLA), which hydrolyzes into lactic acid within about a month. Purchasing used beads instead of new ones reduces waste and costs.

More restrictive measures could ban toxic beads entirely and permit only non-toxic alternatives such as beads made from paste, paper, clay, wood, or painted peas. Some U.S. communities have successfully banned plastic bags, suggesting such a ban is feasible. New Orleans could impose a tax or fee on vendors, entertainers, and attendees to offset the city's annual cleanup costs.

Did You Know?

• Plastic beads were introduced to Mardi Gras only in the late 1970s.
• Beads used to be made of glass, many imported from Czechoslovakia.
• The ritual of throwing beads dates back to the nineteenth century.