The Department of Environment and Natural Resources-Environmental Management Bureau (DENR-EMB) has issued Memorandum Circular 2022-003, amending MC 2016-008 relative to the issuance of Permit to Operate (PTO) to all Standby Generator Sets (G.S) without requiring source emission testing in accordance with Section 1 of DAO 2004-26 and DAO 2000-81 of R.A. 8749.