Cities Utilize Dry Ice as Rodenticide Alternative

New York, Chicago, Boston, and Washington, D.C. are among cities that are using dry ice as a tool for rat control, reports Marketplace. Exterminators place dry ice pellets in burrow entrances, where they give off carbon dioxide that suffocates rats inside. Although the method is more labor-intensive than using rodenticide, it can be more effective in a network of burrows, and it prevents secondary poisonings of predators.