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Redlines and Greenspace: The Relationship between Historical Redlining and 2010 Greenspace across the United States

Environmental health perspectives, 2021-01, Vol.129 (1), p.17006 [Peer Reviewed Journal]

Reproduced from Environmental Health Perspectives. This article is published under https://ehp.niehs.nih.gov/about-ehp/copyright-permissions (the “License”). Notwithstanding the ProQuest Terms and Conditions, you may use this content in accordance with the terms of the License. ;ISSN: 0091-6765 ;EISSN: 1552-9924 ;DOI: 10.1289/ehp7495 ;PMID: 33502254

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  • Title:
    Redlines and Greenspace: The Relationship between Historical Redlining and 2010 Greenspace across the United States
  • Author: Nardone, Anthony ; Rudolph, Kara E ; Morello-Frosch, Rachel ; Casey, Joan A
  • Subjects: Air pollution ; Census ; Health disparities ; Health promotion ; Matching ; Maximum likelihood estimation ; Minority & ethnic groups ; Neighborhoods ; Normalized difference vegetative index ; Outdoor air quality ; Polygons ; Population ; Population density ; Satellite imagery ; Security ; Segregation ; Sociodemographics ; Standard deviation ; Urban areas
  • Is Part Of: Environmental health perspectives, 2021-01, Vol.129 (1), p.17006
  • Description: Redlining, a racist mortgage appraisal practice of the 1930s, established and exacerbated racial residential segregation boundaries in the United States. Investment risk grades assigned ago through security maps from the Home Owners' Loan Corporation (HOLC) are associated with current sociodemographics and adverse health outcomes. We assessed whether historical HOLC investment grades are associated with 2010 greenspace, a health-promoting neighborhood resource. We compared 2010 normalized difference vegetation index (NDVI) across previous HOLC neighborhood grades using propensity score restriction and matching. Security map shapefiles were downloaded from the Mapping Inequality Project. Neighborhood investment risk grades included A (best, green), B (blue), C (yellow), and D (hazardous, red, i.e., redlined). We used 2010 satellite imagery to calculate the average NDVI for each HOLC neighborhood. Our main outcomes were 2010 annual average NDVI and summer NDVI. We assigned areal-apportioned 1940 census measures to each HOLC neighborhood. We used propensity score restriction, matching, and targeted maximum likelihood estimation to limit model extrapolation, reduce confounding, and estimate the association between HOLC grade and NDVI for the following comparisons: Grades B vs. A, C vs. B, and D vs. C. Across 102 urban areas (4,141 HOLC polygons), annual average 2010 NDVI was 0.47 ( ), 0.43 ( ), 0.39 ( ), and 0.36 ( ) in Grades A-D, respectively. In analyses adjusted for current ecoregion and census region, 1940s census measures, and 1940s population density, annual average NDVI values in 2010 were estimated at (95% CI: , ), (95% CI: , ), and (95% CI: , ) for Grades B vs. A, C vs. B, and D vs. C, respectively, in the 1930s. Estimates adjusted for historical characteristics indicate that neighborhoods assigned worse HOLC grades in the 1930s are associated with reduced present-day greenspace. https://doi.org/10.1289/EHP7495.
  • Publisher: United States: National Institute of Environmental Health Sciences
  • Language: English
  • Identifier: ISSN: 0091-6765
    EISSN: 1552-9924
    DOI: 10.1289/ehp7495
    PMID: 33502254
  • Source: Open Access: PubMed Central
    US Government Documents
    AUTh Library subscriptions: ProQuest Central
    Directory of Open Access Journals
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