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. 2020 Mar 16;19:34. doi: 10.1186/s12940-020-00584-z

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© The Author(s) 2020

Open AccessThis article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated in a credit line to the data.

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Fig. 2 — Correlation of BC and NO₂ levels within Allegheny County census tracts. Exposure estimates for each pollutant were obtained for each census tract as described from the LUR models (Fig. 1). Each point represents a single tract plotted in terms of its modeled BC (μg/m³) and NO₂ (ppb) value. Linear regression of the entire dataset indicates a significant positive correlation between each pollutant; however, considerable variability exists around the linear relationship (r² = 0.3178)