The Environmental Protection Agency (EPA) is approving State Implementation Plan (SIP) revisions submitted by the State of New Hampshire on March 31, 2011 and on July 23, 2013. These SIP revisions establish particulate matter (PM) and visible emissions (VE) standards for the following sources: foundries, smelters, and investment casting operations; hot mix asphalt plants; and sand and gravel sources, non- metallic mineral processing plants, and cement and concrete sources. In addition, EPA is approving a part of a SIP revision submitted by New Hampshire on March 12, 2003 that establishes procedures for testing opacity of emissions (i.e., VE). This action is being taken under the Clean Air Act.