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this content across social media, with one-click access to facebook, twitter, pinterest, and other major social media sites. data, source code and documentation, including this document, are available for download at the air trends report github repository . this document details the methodologies used
tribal agencies or other organizations that are not part of the natts network. the natts sites were created to generate long-term, quality assured, standardized ambient air toxics data to identify trends in air toxic concentrations, support model evaluation and other air toxics program needs. epa used...
https://gispub.epa.gov/air/trendsreport/2019/documentation/Air_Trends_Report_Methodologies.docx