US introduces consolidated regs.
D000397:Air Pollution / Q000331:legislation & jurisprudence* / Q000517:prevention & control*; D002617:Chemical Industry; D003625:Data Collection; D004784:Environmental Monitoring / Q000592:standards*; D006801:Humans; D008420:Manufactured Materials; D011640:Public Policy; D014481:United States; D014484:United States Environmental Protection Agency