(a) Notwithstanding the other provisions of this chapter, the board of trustees of any municipal firemen's relief and pension fund for which a full one-mill tax is levied and which received in excess of five hundred thousand dollars ($500,000) from premium tax funds during the most recent year shall increase surviving spouse benefits payable from the firemen's relief and pension fund to the amount of the pension received by the retired firefighter at the time of his or her death, or the amount of the pension to which the member would have been entitled on the day he or she died had he or she been retired.
(b) The board shall direct a monthly pension in the increased amount effective on or before August 1, 1993.