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. 2019 Mar 15;127(3):037006. doi: 10.1289/EHP3860

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EHP is an open-access journal published with support from the National Institute of Environmental Health Sciences, National Institutes of Health. All content is public domain unless otherwise noted.

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Figure 1 is a map of the USA marking counties not included, counties in study area, and counties in study area with monitoring sites, which are indicating fire point of origin across an area of 0 to 1,000 kilometers. — Counties included in analysis, 2008–2010.

The centroid of all highlighted counties ( $n = 692$ ) were located within $200 km$ of a wildfire point of origin ( $n = 123$ , denoted by a triangle), of which 178 counties (25.7%) had monitoring sites.