{"data":{"id":"us/40-cfr-table-1b-to-subpart-dddd-of-part-63","jurisdiction":"us","citation":"40 CFR Table 1B to Subpart DDDD of Part 63","heading":"Table 1B to Subpart DDDD of Part 63—Add-on Control Systems Compliance Options","body":"For each of the following process units . . . You must comply with one of the following six compliance options by using an emissions control system . . .\nFiberboard mat dryer heated zones (at new affected sources only); green rotary dryers; hardboard ovens; press predryers (at new affected sources only); pressurized refiners; primary tube dryers; secondary tube dryers; reconstituted wood product board coolers (at new affected sources only); reconstituted wood product presses; softwood veneer dryer heated zones; rotary strand dryers; conveyor strand dryer zone one (at existing affected sources); and conveyor strand dryer zones one and two (at new affected sources) (1) Reduce emissions of total HAP, measured as THC (as carbon) a, by 90 percent; or (2) Limit emissions of total HAP, measured as THC (as carbon) a, to 20 ppmvd; or (3) Reduce methanol emissions by 90 percent; or (4) Limit methanol emissions to less than or equal to 1 ppmvd if uncontrolled methanol emissions entering the control device are greater than or equal to 10 ppmvd; or (5) Reduce formaldehyde emissions by 90 percent; or (6) Limit formaldehyde emissions to less than or equal to 1 ppmvd if uncontrolled formaldehyde emissions entering the control device are greater than or equal to 10 ppmvd.\na You may choose to subtract methane from THC as carbon measurements.","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 DDDD—National Emission Standards for Hazardous Air Pollutants: Plywood and Composite Wood Products"],"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":"e4ebd8bbc417b400d69958336743a3a29bbff6878e9d8046f7de5e752cdac493","source_id":"us-cfr","stale":true,"prev":"us/40-cfr-table-1a-to-subpart-dddd-of-part-63","next":"us/40-cfr-table-1c-to-subpart-dddd-of-part-63"},"notice":"GroundRules: Original legal text. Not legal advice."}