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This document is not intended, nor can it be relied upon, to create any rights enforceable by any party in litigation with the United States. This guidance may be revised without public notice to reflect changes in EPA’s approach to implementing 40 CFR Parts 50, 53, and 58.  \nMention of commercial products or trade names should not be interpreted as endorsement. Some types of instruments currently in use may be described in text or in example figures or tables. Sometimes these products are given as a typical and perhaps well-known example of the general class of instruments. Other instruments in the class are available and may be fully acceptable.  \nTable of Contents  \n1.0 Introduction ..................................................................................................................................... 1  \n1.1 Definitions .................................................................................................................................... 3  \n1.2 Guiding Principles ...................................................................................................................... 8  \n1.2.1 Standards for Data Usability ............................................................................................. 9  \n1.2.1.1 Regulatory Requirements............................................................................................. 10  \n1.2.1.1.1 Data Quality Regulations and Policy ......................................................................... 10  \n1.2.1.1.2 Ambient Air Monitoring Regulations ......................................................................... 11  \n1.2.1.2 Technical Expectations ..................................................................................................... 12  \n1.2.1.2.1 FRM/FEM Requirements ........................................................................................ 13  \n1.2.1.2.2 Traceable Measurements ......................................................................................... 14  \n1.2.1.3 Defensibility ................................................................................................................... 14  \n1.2.1.3.1 Documentation ......................................................................................................... 15  \n1.2.1.3.2 Custody ..................................................................................................................... 16  \n2.0 Building a Data Review Program ................................................................................................ 16  \n2.1 Personnel.................................................................................................................................... 16  \n2.1.1 Independence ..................................................................................................................... 17  \n2.2 Tools ........................................................................................................................................... 19  \n2.2.1 EPA Data Validation Templates ...................................................................................... 19  \n2.2.1.1 Template Design and Utilization .................................................................................... 20  \n2.2.1.2 Compelling Evidence ....................................................................................................... 24  \n2.2.1.3 Weight of Evidence Approach ............................................................................","cbCaii6Gmd0RZ1GL","https://ap.wps.com/l/cbCaii6Gmd0RZ1GL","pdf",6083958,96,"English","# Introduction\n## Definitions\n## Guiding Principles\n### Standards for Data Usability\n#### Regulatory Requirements\n#### Technical Expectations\n#### Defensibility\n## Building a Data Review Program\n## Data Review Process\n## Overall Assessment of Data Quality","[{\"question\":\"What is the purpose of this guidance document?\",\"answer\":\"It provides advisory guidance on best practices for reviewing and validating ambient air monitoring data. 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