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. Author manuscript; available in PMC: 2017 Jul 1.
Published in final edited form as: Environ Res. 2016 Mar 31;148:102–111. doi: 10.1016/j.envres.2016.03.036

Figure 1.

Figure 1

Distribution of NO2 in Oklahoma using 2006 estimates from the satellite-based land-use regression model developed by Novotny et al. (2011).

Source: Major interstate highways were obtained from the National Transportation Atlas Databases for the United States published by the Federal Highway Administration.