EPA Expected To Tighten PM2.5 Annual Limit To Low End Of Planned Range

EPA is expected to select a tougher annual standard for fine particulate matter (PM2.5) at the low end of the range it has proposed, sources say, a move that industry groups say would set the standard close to background levels and push many more areas of the country into nonattainment and increase their regulatory burdens. The sources say that agency and White House officials are discussing a limit of 9 micrograms per cubic meter (ug/m3) amid recent lobbying activity from...