Site Feedback

Title 40

Displaying title 40, up to date as of 7/09/2026. Title 40 was last amended 7/09/2026.
There have been changes in the last two weeks to Subpart DDDD.
eCFR Content

The Code of Federal Regulations (CFR) is the official legal print publication containing the codification of the general and permanent rules published in the Federal Register by the departments and agencies of the Federal Government. The Electronic Code of Federal Regulations (eCFR) is a continuously updated online version of the CFR. It is not an official legal edition of the CFR.

Learn more about the eCFR, its status, and the editorial process.

Title 40Protection of EnvironmentPart / Section
Chapter IEnvironmental Protection Agency1 – 1099
Subchapter CAir Programs50 – 99
Part 63National Emission Standards for Hazardous Air Pollutants for Source Categories63.1 – 63.12099
Subpart DDDDNational Emission Standards for Hazardous Air Pollutants: Plywood and Composite Wood Products63.2230 – 63.2292
What This Subpart Covers63.2230 – 63.2233
§ 63.2230What is the purpose of this subpart?
§ 63.2231Does this subpart apply to me?
§ 63.2232What parts of my plant does this subpart cover?
§ 63.2233When do I have to comply with this subpart?
Compliance Options, Operating Requirements, and Work Practice Requirements63.2240 – 63.2241
§ 63.2240What are the compliance options and operating requirements and how must I meet them?
§ 63.2241What are the work practice requirements and how must I meet them?
General Compliance Requirements63.2250 – 63.2253
§ 63.2250What are the general requirements?
§ 63.2251What are the requirements for the routine control device maintenance exemption?
§ 63.2252 [Reserved]
§ 63.2253What are the general requirements for lumber kilns?
Initial Compliance Requirements63.2260 – 63.2269
§ 63.2260How do I demonstrate initial compliance with the compliance options, operating requirements, and work practice requirements?
§ 63.2261By what date must I conduct performance tests or other initial compliance demonstrations?
§ 63.2262How do I conduct performance tests and establish operating requirements?
§ 63.2263Initial compliance demonstration for a dry rotary dryer.
§ 63.2264Initial compliance demonstration for a hardwood veneer dryer.
§ 63.2265Initial compliance demonstration for a softwood veneer dryer.
§ 63.2266Initial compliance demonstration for a veneer redryer.
§ 63.2267Initial compliance demonstration for a reconstituted wood product press or board cooler.
§ 63.2268Initial compliance demonstration for a wet control device.
§ 63.2269What are my monitoring installation, operation, and maintenance requirements?
Continuous Compliance Requirements63.2270 – 63.2271
§ 63.2270How do I monitor and collect data to demonstrate continuous compliance?
§ 63.2271How do I demonstrate continuous compliance with the compliance options, operating requirements, and work practice requirements?
Notifications, Reports, and Records63.2280 – 63.2283
§ 63.2280What notifications must I submit and when?
§ 63.2281What reports must I submit and when?
§ 63.2282What records must I keep?
§ 63.2283In what form and how long must I keep my records?
Other Requirements and Information63.2290 – 63.2292
§ 63.2290What parts of the general provisions apply to me?
§ 63.2291Who implements and enforces this subpart?
§ 63.2292What definitions apply to this subpart?
Table 1A to Subpart DDDD of Part 63
Production-Based Compliance Options
Table 1B to Subpart DDDD of Part 63
Add-on Control Systems Compliance Options
Table 1C to Subpart DDDD of Part 63
Compliance Options Applicable On and After July 6, 2026
Table 1D to Subpart DDDD of Part 63
Compliance Options Applicable On and After July 6, 2029, for Direct Wood-Fired PCWP Dryers at Affected Sources That Commenced Construction or Reconstruction On or Before May 18, 2023
Table 1E to Subpart DDDD of Part 63
Compliance Options Applicable On and After July 6, 2026, for Direct Wood-Fired PCWP Dryers at Affected Sources That Commenced Construction or Reconstruction After May 18, 2023
Table 2 to Subpart DDDD of Part 63
Operating Requirements
Table 3 to Subpart DDDD of Part 63
Work Practice Requirements
Table 4 to Subpart DDDD of Part 63
Requirements for Performance Tests
Table 5 to Subpart DDDD of Part 63
Performance Testing and Initial Compliance Demonstrations for the Compliance Options and Operating Requirements
Table 6 to Subpart DDDD of Part 63
Initial Compliance Demonstrations for Work Practice Requirements
Table 7 to Subpart DDDD of Part 63
Continuous Compliance With the Compliance Options and Operating Requirements
Table 8 to Subpart DDDD of Part 63
Continuous Compliance With the Work Practice Requirements Requirements
Table 9 to Subpart DDDD of Part 63
Requirements for Reports
Table 10 to Subpart DDDD of Part 63
Applicability of General Provisions to This Subpart
Table 11 to Subpart DDDD of Part 63
Lumber Minimum Moisture Content Limits
Table 12 to Subpart DDDD of Part 63
Toxic Equivalency Factors
Appendix A to Subpart DDDD of Part 63
Alternative Procedure To Determine Capture Efficiency From Enclosures Around Hot Presses in the Plywood and Composite Wood Products Industry Using Sulfur Hexafluoride Tracer Gas