; and (B) the total population of all States. (4) Relative unit of local government population proportion amount For purposes of subsection (b), with respect to a unit of local government, the relative unit of local government population proportion amount is equal to the product of— (A) the relative population proportion amount determined under paragraph (2) for the State in which the unit of local government is located; and (B) the quotient of— (i) the population of the unit of local government; and (ii) the sum of the population of all units of local government with a population of 500,000 or less within the State that submit the certification required by subsection (e) by the deadline specified in that subsection. (5) Data For purposes of this subsection, the population of States and units of local governments shall be determined based on the most recent year for which data are available from the Bureau of the Census. (6) Other relief The payments made under this section shall be in addition to, and shall not affect or reduce, payments made to units of local government with a population that exceeds 500,000 under section 601. (d) Use of funds (1) In general A unit of local government shall use the funds provided under a payment made under this section to cover only those costs of the unit of local government that— (A) such government reasonably deems to be necessary and directly or indirectly involve, relate to, are, have been, or will be incurred due to, or are, have been, or will be a response to circumstances caused by, the public health emergency with respect to the Coronavirus Disease 2019 (COVID–19)