Emission Standard Emission Standards are the legal requirements governing air pollutants released into the atmosphere.Emission Standards set quantitative limits on the permissible amount of specifics air pollutants that may be released from sources over specific timeframes. They are generally designed to achieve air quality standards and to protects human life. different countries and regions have different standards for emissions. This action sets for the EPA's Environmental Protection Agency decision an aspects of the agency proposed reconsideration of the December 1, 2015, Final Rule Petroleum Refinery Sector Residual Risk and Technology Review (RTR) and New Source Performance Standards (NSPS). SUPPLEMENTARY INFORMATION Acronyms : A no. of acronyms are used in this preamble. While this list may not be exhaustive, to ease the reading of this preamble and for reference purposes. AEGL acute exposure guideline level...