{"data":{"id":"us/40-cfr-table-15-to-subpart-ddddd-of-part-63","jurisdiction":"us","citation":"40 CFR Table 15 to Subpart DDDDD of Part 63","heading":"Table 15 to Subpart DDDDD of Part 63—Alternative Emission Limits for Existing Boilers and Process Heaters d","body":"As stated in § 63.7500, you may continue to comply with following emission limits until October 6, 2025:\n[Units with heat input capacity of 10 million Btu per hour or greater]\nIf your boiler or process heater is in this subcategory . . . For the following pollutants . . . The emissions must not exceed the following emission limits, except during startup and shutdown . . . The emissions must not exceed the following alternative output-based limits, except during startup and shutdown . . . Using this specified sampling volume or test run duration . . .\n1. Units in all subcategories designed to burn solid fuel a. HCl 2.2E-02 lb per MMBtu of heat input 2.5E-02 lb per MMBtu of steam output or 0.27 lb per MWh For M26A, Collect a minimum of 1 dscm per run; for M26, collect a minimum of 120 liters per run.\nb. Mercury 5.7E-06 lb per MMBtu of heat input 6.4E-06 lb per MMBtu of steam output or 7.3E-05 lb per MWh For M29, collect a minimum of 3 dscm per run; for M30A or M30B, collect a minimum sample as specified in the method; for ASTM D6784 b collect a minimum of 3 dscm.\n2. Units design to burn coal/solid fossil fuel a. Filterable PM (or TSM) 4.0E-02 lb per MMBtu of heat input; or (5.3E-05 lb per MMBtu of heat input) 4.2E-02 lb per MMBtu of steam output or 4.9E-01 lb per MWh; or (5.6E-05 lb per MMBtu of steam output or 6.5E-04 lb per MWh) Collect a minimum of 2 dscm per run.\n3. Pulverized coal boilers designed to burn coal/solid fossil fuel a. CO (or CEMS) 130 ppm by volume on a dry basis corrected to 3-percent oxygen, 3-run average; or (320 ppm by volume on a dry basis corrected to 3-percent oxygen,c 30-day rolling average) 0.11 lb per MMBtu of steam output or 1.4 lb per MWh; 3-run average 1 hr minimum sampling time.\n4. Stokers/others designed to burn coal/solid fossil fuel a. CO (or CEMS) 160 ppm by volume on a dry basis corrected to 3-percent oxygen, 3-run average; or (340 ppm by volume on a dry basis corrected to 3- percent oxygen,c 30-day rolling average) 0.14 lb per MMBtu of steam output or 1.7 lb per MWh; 3-run average 1 hr minimum sampling time.\n5. Fluidized bed units designed to burn coal/solid fossil fuel a. CO (or CEMS) 130 ppm by volume on a dry basis corrected to 3-percent oxygen, 3-run average; or (230 ppm by volume on a dry basis corrected to 3- percent oxygen,c 30-day rolling average) 0.12 lb per MMBtu of steam output or 1.4 lb per MWh; 3-run average 1 hr minimum sampling time.\n6. Fluidized bed units with an integrated heat exchanger designed to burn coal/solid fossil fuel a. CO (or CEMS) 140 ppm by volume on a dry basis corrected to 3-percent oxygen, 3-run average; or (150 ppm by volume on a dry basis corrected to 3-percent oxygen,c 30-day rolling average) 1.3E-01 lb per MMBtu of steam output or 1.5 lb per MWh; 3-run average 1 hr minimum sampling time.\n7. Stokers/sloped grate/others designed to burn wet biomass fuel a. CO (or CEMS) 1,500 ppm by volume on a dry basis corrected to 3-percent oxygen, 3-run average; or (720 ppm by volume on a dry basis corrected to 3-percent oxygen,c 30-day rolling average) 1.4 lb per MMBtu of steam output or 17 lb per MWh; 3-run average 1 hr minimum sampling time.\nb. Filterable PM (or TSM) 3.7E-02 lb per MMBtu of heat input; or (2.4E-04 lb per MMBtu of heat input) 4.3E-02 lb per MMBtu of steam output or 5.2E-01 lb per MWh; or (2.8E-04 lb per MMBtu of steam output or 3.4E-04 lb per MWh) Collect a minimum of 2 dscm per run.\n8. Stokers/sloped grate/others designed to burn kiln-dried biomass fuel a. CO 460 ppm by volume on a dry basis corrected to 3-percent oxygen 4.2E-01 lb per MMBtu of steam output or 5.1 lb per MWh 1 hr minimum sampling time.\nb. Filterable PM (or TSM) 3.2E-01 lb per MMBtu of heat input; or (4.0E-03 lb per MMBtu of heat input) 3.7E-01 lb per MMBtu of steam output or 4.5 lb per MWh; or (4.6E-03 lb per MMBtu of steam output or 5.6E-02 lb per MWh) Collect a minimum of 1 dscm per run.\n9. Fluidized bed units designed to burn biomass/bio-based solid a. CO (or CEMS) 470 ppm by volume on a dry basis corrected to 3-percent oxygen, 3-run average; or (310 ppm by volume on a dry basis corrected to 3- percent oxygen,c 30-day rolling average) 4.6E-01 lb per MMBtu of steam output or 5.2 lb per MWh; 3-run average 1 hr minimum sampling time.\nb. Filterable PM (or TSM) 1.1E-01 lb per MMBtu of heat input; or (1.2E-03 lb per MMBtu of heat input) 1.4E-01 lb per MMBtu of steam output or 1.6 lb per MWh; or (1.5E-03 lb per MMBtu of steam output or 1.7E-02 lb per MWh) Collect a minimum of 1 dscm per run.\n10. Suspension burners designed to burn biomass/bio-based solid a. CO (or CEMS) 2,400 ppm by volume on a dry basis corrected to 3-percent oxygen, 3-run average; or (2,000 ppm by volume on a dry basis corrected to 3-percent oxygen,c 10-day rolling average) 1.9 lb per MMBtu of steam output or 27 lb per MWh; 3-run average 1 hr minimum sampling time.\nb. Filterable PM (or TSM) 5.1E-02 lb per MMBtu of heat input; or (6.5E-03 lb per MMBtu of heat input) 5.2E-02 lb per MMBtu of steam output or 7.1E-01 lb per MWh; or (6.6E-03 lb per MMBtu of steam output or 9.1E-02 lb per MWh) Collect a minimum of 2 dscm per run.\n11. Dutch Ovens/Pile burners designed to burn biomass/bio-based solid a. CO (or CEMS) 770 ppm by volume on a dry basis corrected to 3-percent oxygen, 3-run average; or (520 ppm by volume on a dry basis corrected to 3-percent oxygen,c 10-day rolling average) 8.4E-01 lb per MMBtu of steam output or 8.4 lb per MWh; 3-run average 1 hr minimum sampling time.\nb. Filterable PM (or TSM) 2.8E-01 lb per MMBtu of heat input; or (2.0E-03 lb per MMBtu of heat input) 3.9E-01 lb per MMBtu of steam output or 3.9 lb per MWh; or (2.8E-03 lb per MMBtu of steam output or 2.8E-02 lb per MWh) Collect a minimum of 1 dscm per run.\n12. Fuel cell units designed to burn biomass/bio-based solid a. CO 1,100 ppm by volume on a dry basis corrected to 3-percent oxygen 2.4 lb per MMBtu of steam output or 12 lb per MWh 1 hr minimum sampling time.\nb. Filterable PM (or TSM) 2.0E-02 lb per MMBtu of heat input; or (5.8E-03 lb per MMBtu of heat input) 5.5E-02 lb per MMBtu of steam output or 2.8E-01 lb per MWh; or (1.6E-02 lb per MMBtu of steam output or 8.1E-02 lb per MWh) Collect a minimum of 2 dscm per run.\n13. Hybrid suspension grate units designed to burn biomass/bio-based solid a. CO (or CEMS) 3,500 ppm by volume on a dry basis corrected to 3-percent oxygen, 3-run average; or (900 ppm by volume on a dry basis corrected to 3- percent oxygen,c 30-day rolling average) 3.5 lb per MMBtu of steam output or 39 lb per MWh; 3-run average 1 hr minimum sampling time.\nb. Filterable PM (or TSM) 4.4E-01 lb per MMBtu of heat input; or (4.5E-04 lb per MMBtu of heat input) 5.5E-01 lb per MMBtu of steam output or 6.2 lb per MWh; or (5.7E-04 lb per MMBtu of steam output or 6.3E-03 lb per MWh) Collect a minimum of 1 dscm per run.\n14. Units designed to burn liquid fuel a. HCl 1.1E-03 lb per MMBtu of heat input 1.4E-03 lb per MMBtu of steam output or 1.6E-02 lb per MWh For M26A, collect a minimum of 2 dscm per run; for M26, collect a minimum of 240 liters per run.\nb. Mercury 2.0E-06 lb per MMBtu of heat input 2.5E-06 lb per MMBtu of steam output or 2.8E-05 lb per MWh For M29, collect a minimum of 3 dscm per run; for M30A or M30B collect a minimum sample as specified in the method, for ASTM D6784 b collect a minimum of 2 dscm.\n15. Units designed to burn heavy liquid fuel a. CO 130 ppm by volume on a dry basis corrected to 3-percent oxygen, 3-run average 0.13 lb per MMBtu of steam output or 1.4 lb per MWh; 3-run average 1 hr minimum sampling time.\nb. Filterable PM (or TSM) 6.2E-02 lb per MMBtu of heat input; or (2.0E-04 lb per MMBtu of heat input) 7.5E-02 lb per MMBtu of steam output or 8.6E-01 lb per MWh; or (2.5E-04 lb per MMBtu of steam output or 2.8E-03 lb per MWh) Collect a minimum of 1 dscm per run.\n16. Units designed to burn light liquid fuel a. CO 130 ppm by volume on a dry basis corrected to 3-percent oxygen 0.13 lb per MMBtu of steam output or 1.4 lb per MWh 1 hr minimum sampling time.\nb. Filterable PM (or TSM) 7.9E-03 lb per MMBtu of heat input; or (6.2E-05 lb per MMBtu of heat input) 9.6E-03 lb per MMBtu of steam output or 1.1E-01 lb per MWh; or (7.5E-05 lb per MMBtu of steam output or 8.6E-04 lb per MWh) Collect a minimum of 3 dscm per run.\n17. Units designed to burn liquid fuel that are non-continental units a. CO 130 ppm by volume on a dry basis corrected to 3-percent oxygen, 3-run average based on stack test 0.13 lb per MMBtu of steam output or 1.4 lb per MWh; 3-run average 1 hr minimum sampling time.\nb. Filterable PM (or TSM) 2.7E-01 lb per MMBtu of heat input; or (8.6E-04 lb per MMBtu of heat input) 3.3E-01 lb per MMBtu of steam output or 3.8 lb per MWh; or (1.1E-03 lb per MMBtu of steam output or 1.2E-02 lb per MWh) Collect a minimum of 2 dscm per run.\n18. Units designed to burn gas 2 (other) gases a. CO 130 ppm by volume on a dry basis corrected to 3-percent oxygen 0.16 lb per MMBtu of steam output or 1.0 lb per MWh 1 hr minimum sampling time.\nb. HCl 1.7E-03 lb per MMBtu of heat input 2.9E-03 lb per MMBtu of steam output or 1.8E-02 lb per MWh For M26A, collect a minimum of 2 dscm per run; for M26, collect a minimum of 240 liters per run.\nc. Mercury 7.9E-06 lb per MMBtu of heat input 1.4E-05 lb per MMBtu of steam output or 8.3E-05 lb per MWh For M29, collect a minimum of 3 dscm per run; for M30A or M30B, collect a minimum sample as specified in the method; for ASTM D6784 b collect a minimum of 2 dscm.\nd. Filterable PM (or TSM) 6.7E-03 lb per MMBtu of heat input or (2.1E-04 lb per MMBtu of heat input) 1.2E-02 lb per MMBtu of steam output or 7.0E-02 lb per MWh; or (3.5E-04 lb per MMBtu of steam output or 2.2E-03 lb per MWh) Collect a minimum of three dscm per run.\na If you are conducting stack tests to demonstrate compliance and your performance tests for this pollutant for at least 2 consecutive years show that your emissions are at or below this limit, you can skip testing according to § 63.7515 if all of the other provisions of § 63.7515 are met. For all other pollutants that do not contain a footnote a, your performance tests for this pollutant for at least 2 consecutive years must show that your emissions are at or below 75 percent of this limit in order to qualify for skip testing.\nb Incorporated by reference, see § 63.14.\nc An owner or operator may determine compliance with the carbon monoxide emissions limit using carbon dioxide as a diluent correction in place of oxygen as described in § 63.7525(a)(1). EPA Method 19 F-factors in 40 CFR part 60, appendix A-7, and EPA Method 19 equations in 40 CFR part 60, appendix A-7, must be used to generate the appropriate CO2 correction percentage for the fuel type burned in the unit, and must also take into account that the 3% oxygen correction is to be done on a dry basis. The methodology must account for any CO2 being added to, or removed from, the emissions gas stream as a result of limestone injection, scrubber media, etc. This methodology must be detailed in the site-specific monitoring plan developed according to § 63.7505(d).\nd Before October 6, 2025 you may comply with the emission limits in this Table 15. On and after October 6, 2025, you must comply with the emission limits in Table 2 to this subpart.","path":["Title 40—Protection of Environment","CHAPTER I—ENVIRONMENTAL PROTECTION AGENCY","SUBCHAPTER C—AIR PROGRAMS","PART 63—NATIONAL EMISSION STANDARDS FOR HAZARDOUS AIR POLLUTANTS FOR SOURCE CATEGORIES","Subpart DDDDD—National Emission Standards for Hazardous Air Pollutants for Major Sources: Industrial, Commercial, and Institutional Boilers and Process Heaters"],"source_url":"https://www.ecfr.gov/api/versioner/v1/full/2026-08-25/title-40.xml","current_through":"2026-08-25","vintage":"","retrieved_at":"2026-08-27T02:26:04Z","sha256":"9a92dd7ac7d9b6030e7785851791e556764572fa7256cee356af2b3a11d522b7","source_id":"us-cfr","stale":true,"prev":"us/40-cfr-table-14-to-subpart-ddddd-of-part-63","next":"us/40-cfr-63.7680"},"notice":"GroundRules: Original legal text. Not legal advice."}