Hazardous waste
waste materials that exhibit hazardous characteristics
Hazardous waste is waste that can damage human health or the environment. Waste can be hazardous because it is toxic, reactive, or corrosive, etc. As of 2022, humanity produces 300–500 million metric tons of hazardous waste annually. Some common sources of hazardous wastes are solvents, batteries, and byproducts of metal refining. Hazardous waste is regulated on local, national, and international scales.
Types
Universal wastes
Universal wastes are a special category of hazardous wastes that (in the U.S.) generally pose a lower threat relative to other hazardous wastes, are ubiquitous and produced in very large quantities by a large number of generators. Some of the most common "universal wastes" are: fluorescent light bulbs, some specialty batteries (e.g. lithium or lead containing batteries), cathode-ray tubes, and mercury-containing devices.
Universal wastes are subject to somewhat less stringent regulatory requirements. Small quantity generators of universal wastes may be classified as "conditionally exempt small quantity generators" (CESQGs) which release them from some of the regulatory requirements for the handling and storage hazardous wastes.
The public source identifies “Hazardous waste” as waste materials that exhibit hazardous characteristics. This brief keeps that definition visible, then builds a research path around Hazardous, waste and materials.
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Named sources, stable identifiers and responsible institutions provide the strongest route from overview to verifiable evidence. The source revision retrieved here is dated Sep 5, 2026. The linked authority identifier is Q1069369. The Library of Congress control number is sh85059459. 1 of 1 selected statements include explicit references; 0 carry qualifiers and 0 use preferred rank. The first chronological checks are 2022.
The absence of detail may reflect summary conventions rather than a lack of surviving documentation. The source lead contains qualifying language; that uncertainty should survive quotation, summary and reuse. Authority statements aid reconciliation but still require their own references, qualifiers and ranks to be checked.
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This entry incorporates text from “Hazardous waste” on English Wikipedia. Contributors are listed in the page history. Text is available under the Creative Commons Attribution-ShareAlike 4.0 License. Selected authority identifiers and statements are retrieved from Wikidata under CC0; their references and qualifiers remain part of the verification path.