U.S. cities contain unknown numbers of undocumented “manufactured gas” sites, legacies of an industry that dominated energy production during the late-19th and early-20th centuries. While many of these unidentified sites likely contain significant levels of highly toxic and biologically persistent contamination, locating them remains a significant challenge. We propose a new method to identify manufactured gas production, storage, and distribution infrastructure in bulk by applying feature extraction and machine learning techniques to digitized historic Sanborn fire insurance maps. Our approach, which relies on a two-part neural network to classify candidate map regions, increases the rate of site identification 20-fold compared to unaided visual coding.

The authors use multiple logistic regression techniques to investigate whether individuals’ occupation, nativity, race, and ethnicity predict residential proximity to large-scale energy infrastructure in Providence, Rhode Island, in 1880 and 1930. Results indicate that in 1880, environmental risks associated with urban energy infrastructure fell most heavily on working-class immigrants; by 1930, those risks disproportionately affected the city’s small population of African American and Latinx residents. Across this 50-year span, environmental inequality racialized such that Providence’s gas lines effectively came to describe the city’s sharpening color line. The article concludes with a discussion of how a historical perspective can help clarify the dynamic relationship between environmental risk and urbanization in the (re)production of racial, ethnic, and economic inequality.

The urban environmental inequality literature holds that marginalized communities are generally concentrated in neighborhoods with greater levels of industrial pollution and lesser access to parks and playfields. Yet, “green” and “brown” land uses are also linked historically and through contemporary practices of green redevelopment. This article thus begins from the understanding that it is important to analyze both forms of urban land use at once, to avoid mistaking one historical process for another. Focusing on Providence, Rhode Island (1970–2010), we leverage original historical data on the location and operating years of public parks alongside comprehensive industrial site data to analyze the joint transformation of residential populations, parks, and industry over time. We find that park access generally increases for Latinx residents; however, after accounting for increases in park access associated with past industrial land use, we find that census tracts with growing proportions of African American residents are associated with relatively less access to parks than other census tracts. Results reveal additional dimensions to the role of industrial history in shaping the socioenvironmental trajectory of local neighborhoods and additionally emphasize the importance of a historical and relational view of urban land use in urban environmental research.