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Synthetic Organic Chemical Manufacturing Industry: New Source Performance Standards (NSPS) - 40 CFR part 60, Subparts VV/VVa/VVb, III/IIIa, NNN/NNNa, & RRR/RRRa

Synthetic Organic Chemical Manufacturing Industry: New Source Performance Standards (NSPS) - 40 CFR part 60, Subparts VV/VVa/VVb, III/IIIa, NNN/NNNa, & RRR/RRRa
Basic Information
Code of Federal Regulations Citations
  • 40 CFR Part 60 Subpart VV
  • 40 CFR Part 60 Subpart VVa
  • 40 CFR Part 60 Subpart VVb
  • 40 CFR Part 60 Subpart III
  • 40 CFR Part 60 Subpart IIIa
  • 40 CFR Part 60 Subpart NNN
  • 40 CFR Part 60 Subpart NNNa
  • 40 CFR Part 60 Subpart RRR
  • 40 CFR Part 60 Subpart RRRa
Docket Numbers
  • EPA-HQ-OAR-2006-0699
  • EPA-HQ-OAR-2022-0730

On this page:

  • Rule Summary
  • Rule History
  • Additional Resources

Rule Summary

The Synthetic Organic Chemical Manufacturing Industry (SOCMI) is a large source category that includes hundreds of chemical plants manufacturing bulk commodity chemicals. EPA has promulgated NSPS for Volatile organic compound (VOC) emissions from process vents and equipment leaks at SOCMI facilities. Process vents from air oxidation units, distillation operations, and reactor processes are required to be controlled under the SOCMI process vent NSPS while for equipment leaks, SOCMI facilities must control VOC emissions following a leak detection and repair program. 

Rule History

05/16/2024 - Final Rule (NSPS VVb, IIIa, NNNa, & RRRa); Lift of Stay (NSPS VV & VVa)  

04/25/2023 - Proposed Rule (NSPS VV/VVa/VVb, NNNa, IIIa, & RRRa)

06/02/2008 – Final Rule; Stay (NSPS VV & VVa)

11/16/2007 - Final Rule (NSPS VV & VVa)

11/07/2006 – Proposed Rule (NSPS VV & VVa)

08/31/1993 - Final Rule (NSPS RRR) [58 FR 45948]

06/29/1990 - Proposed Rule (NSPS RRR) [55 FR 26953]

06/29/1990 - Final Rule (NSPS NNN) [55 FR 26931]

06/29/1990 - Final Rule (NSPS III) [55 FR 26912]

05/16/1985 - Proposed Amendments (NSPS III & NNN) [50 FR 20446]

12/30/1983 - Proposed Rule (NSPS NNN) [48 FR 57538]

10/21/1983 - Proposed Rule (NSPS III) [48 FR 48932]

10/18/1983 - Final Rule (NSPS VV) [48 FR 48328]

01/05/1981 - Proposed Rule (NSPS VV) [46 FR 1136]

Related Rules

Hazardous Organic NESHAP

Additional Resources

Protocol for Equipment Leak Emission Estimates

Distillation Operations in SOCMI - Background Information

CTG for VOC From Reactors and Distillation Operations

Air Oxidation Units in SOCMI - Background Information

Stationary Sources of Air Pollution

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Last updated on July 17, 2024
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