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This action proposes revisions to the existing Air Emissions Reporting Requirements (AERR) rule last revised on February 19, 2015 (80 FR 8787). The EPA is considering how to improve the quality and completeness of hazardous air pollutant (HAP) emissions data from stationary sources and all pollutant emissions data from prescribed fires. Further, the EPA is considering how best to quantify emissions from intermittent sources such as backup generators; how to obtain data from facilities in Indian country when a Tribe is not required to report emissions data; and how to address known data gaps, streamline processes, and improve data quality, documentation, and transparency for nonpoint and mobile sources.