- DENR Administrative Order No. 2021-19 Updated Water Quality Guidelines (WQG) and General Effluent Standards (GES) for Selected Parameters
- DENR EMB Memorandum Circular No. 2021-09 Guidelines in the Implementation of Globally Harmonized System (GHS) Classification and Labelling Requirements for Chemical Mixtures
- DENR EMB Memorandum Circular No 2021-10 Guidelines for Payment of Fines and Penalties for Violation of Environmental Laws, Rules, and Regulations During the Implementation of Community Quarantine
- DENR EMB Memorandum Circular No 2021-11 Registration of Service Providers of Ozone-Depleting Substance (ODS) Using Equipment
- DENR EMB Memorandum Circular No 2021-12 Amendment of EMB Memorandum Circular No. 2014-05 (Annex A) Relative to the Reclassification of Steel and other Steel-Related Projects as Metal Industries
- POEA Memorandum Circular No. 17 Series of 2021 Extension of Accreditation of Principals