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. 2015 Oct 28;26(4):385–396. doi: 10.1038/jes.2015.59

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Spatial distribution of factor scores across monitoring locations for inversion-focused summer sampling, based on proposed 6-factor solution. For factor 2 (brake/tire), the circled highest concentration sites indicate areas located near downtown Pittsburgh. For, factor 3 (steel-making/industry), the circled highest concentrations indicate areas located near an active steel mill. For factor 4 (coal), the circled highest concentration sites indicate areas located near an active coke works.