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Subject segment: UNITED 20STATES 20ACT 20TO 20AMEND 20THE 20CLEAN 20AIR 20ACT 20TO 20PROVIDE 20FOR 20ATTAINMENT 20 7BAND 7D 20MAINTENANCE 20OF 20HEALTH 20PROTECTIVE 20NATIONAL 20AMBIENT 20AIR 20QUALITY 20STANDARDS 20 7BAND 7D 20FOR 20OTHER 20PURPOSES