with the purposes of the withdrawal. (3) Closure If the Secretary, after consulting with the Secretary concerned, determines that the health and safety of the public or the common defense and security require the closure of a road, trail, or other portion of the withdrawal, or the airspace above the withdrawal, the Secretary may effect and maintain the closure and shall provide notice of the closure. (4) Implementation The Secretary and the Secretary concerned shall implement the management plan developed under paragraph (2) under terms and conditions on which they agree. (f) Immunity The United States and its departments and agencies shall be held harmless and shall not be liable for damages to persons or property suffered in the course of any mining, mineral leasing, or geothermal leasing activity conducted on the withdrawal. (g) Land acquisition The Secretary may acquire lands and interests in lands within the withdrawal. Those lands and interests in lands may be acquired by donation, purchase, lease, exchange, easement, rights-of-way, or other appropriate methods using donated or appropriated funds. The Secretary of the Interior shall conduct any exchange of lands within the withdrawal for Federal lands outside the withdrawal. (h) Air quality permits and requirements (1) Preemption No State or unit of general local government thereof may issue, implement, or enforce any air quality permit, or requirement relating to air quality, with respect to any Federal facility or activity described in paragraph (2). (2) Federal facility or activity A Federal facility or activity described in this paragraph is a Federal facility or activity that is— (A) subject to the requirements of the Nuclear Waste Policy Act of 1982 ( 42 U.S.C. 10101 et seq.)