By Valerie Volcovici WASHINGTON (Reuters) – The U.S. Environmental Protection Agency on Friday said it would tighten national air quality standards for fine particle pollution for the first time since 2012, a move that could lead to tougher limits on tailpipe and smokestack emissions. Fine particulate matter, or soot, comes from sources ranging from power plants to cars and trucks. It causes lung and heart damage and has been found to disproportionately affect low-income communities, according to EPA. “Fine particulate matter is both deadly and extremely costly,” EPA Administrator Michael Rega…