Associations issued comments to the Environmental Protection Agency last week saying that the agency has not considered the environmental and public health effects of the mercury and air toxics standard that would allow backup, reciprocating internal combustion engines to run 50 of the 100 hours annually for nonemergency use to meet peak power demand until April 2017 without being subject to emissions limits, giving sources time to address reliability issues as power plants come into compliance with the standards. The National Association of Clean Air Agencies charged that the rule would increase operation of diesel-fired engines and emissions of air toxics, particulate matter, and other pollutants. The Northeast States for Coordinated Air Use Management said that the agency has not released important pieces of information, including the number of engines and their locations, when they would run, and the proposed rule’s impact on states that are trying to meet air quality standards.