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After 10 years of experience implementing the Federal Air Rules for Reservations, EPA Region 10 plans to revise the original rules to provide regulatory relief, streamline and make implementation easier, and promulgate three new rules on Indian Reservations in Idaho, Oregon, and Washington. The proposed revisions result from the obligation of catching up to air measures in neighboring areas, addressing high levels of particulate matter emissions in specific geographical areas, and clarifying aspects of the initial rules. These revisions will further improve basic air quality regulations resulting in the protection of human health and the environment for communities in and adjacent to such Indian reservations.