The earliest concerns about air pollution in the United States arose in response to the smoke emitted by factories that accompanied industrialization. Chicago and Cincinnati enacted the nation’s first clean air laws in 1881. Chicago’s ordinance declared that the emissions of dense smoke from the smokestack of any boat or locomotive or from any chimney anywhere within the city shall be a public nuisance.
- Judith A. Layzer (2012). The Environmental Case: Translating Values Into Policy.