[20130220]R40096_2006年细颗粒物（PM2.5）国家环境空气质量标准（NAAQS）：指定非附着区域.pdf

CRS Report for CongressPrepared for Members and Committees of Congress 2006 National Ambient Air Quality Standards (NAAQS) for Fine Particulate Matter (PM2.5): Designating Nonattainment Areas (name redacted) Specialist in Environmental Policy February 20, 2013 Congressional Research Service 7-. www.crs.gov R40096