title: EPA's PM2.5 program criticized.
mesh_terms: D000397:Air Pollution / Q000331:legislation & jurisprudence*; D004781:Environmental Exposure; D006801:Humans; D009307:National Academy of Sciences, U.S.; D012906:Smoke; D014481:United States; D014484:United States Environmental Protection Agency / Q000331:legislation & jurisprudence*
chemical_list: D012906:Smoke