Miscellaneous Organic Chemical Manufacturing: National Emission Standards for Hazardous Air Pollutants (NESHAP)
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Rule Summary
The national emission standards for hazardous air pollutants (NESHAP) for the miscellaneous organic chemical (MON) manufacturing industry established emission limits and work practice standards for new and existing miscellaneous organic chemical manufacturing process units, wastewater treatment and conveyance systems, transfer operations, and associated ancillary equipment and implemented section 112(d) of the Clean Air Act (CAA) by requiring all major sources to meet hazardous air pollutants (HAP) emission standards to reflect application of the maximum achievable control technology (MACT).
The HAP emitted from MON manufacturing facilities include toluene, ethylene oxide, methanol, xylene, hydrogen chloride, and methylene chloride. Exposure to these substances may cause adverse health effects such as irritation of the lung, eye, and mucous membranes, effects on the central nervous system, and cancer.
See the regulations below for more details.
Rule History
04/04/2024 - Petroleum Refinery and Chemical Sector Final Amendments
04/27/2023 - Petroleum Refinery and Chemical Sector Proposed Amendments
02/04/2022 - Proposed Rule: Reconsideration of the 2020 NESHAP for the MON RTR
12/17/2019 - Public Hearing and Comment Period Extension
08/06/2008 - Miscellaneous Organic Chemical Manufacturing Proposed Amendments
07/14/2006 - Miscellaneous Organic Chemical Manufacturing Final Rule
12/08/2005 - Miscellaneous Organic Chemical Manufacturing Proposed Rule
08/30/2005 - Miscellaneous Organic Chemical Manufacturing Partial Withdrawal of Rule
07/01/2005 - Miscellaneous Organic Chemical Manufacturing Direct final Rule; Amendments
11/10/2003 - Miscellaneous Organic Chemical Manufacturing Final Rule
05/01/2002 - Miscellaneous Organic Chemical Manufacturing Proposed Rule; Comment Period Extension
04/04/2002 - Miscellaneous Organic Chemical Manufacturing Proposed Rule
Additional Resources
Reconsideration:
- Fact Sheet: Reconsideration of the 2022 MON Residual Risk & Technology Review (pdf)
- Public Hearing Information for the Reconsideration
- Fact Sheet: Reconsideration Proposal of the MON Final Risk and Technology Review Amendments (pdf)
- Ficha Informativa: Reconsideración de las Normas Nacionales de Emisiones para Contaminantes Peligrosos del Aire (NESHAP) de 2020 - Industria química orgánica miscelánea (pdf)
- TỜ SỰ KIỆN: Xem xét lại Tiêu Chuẩn Khí Thải Quốc Gia Năm 2020 Đối Với các Chất Gây Ô Nhiễm Không Khí Nguy Hiểm (NESHAP): Sản Xuất Hóa Chất Hữu Cơ Linh Tinh (pdf)
Final Amendments:
- Fact Sheet: Final Petroleum Refinery and Chemical Sector Amendments (03/15/2024)
- Fact Sheet: Final Risk and Technology Review Amendments
Proposed Amendments:
- Fact Sheet - Petroleum Refinery and Chemical Sector Proposed Amendments (pdf)
- Fact Sheet: Proposed Risk and Technology Review Amendments
- Webinar slides
View the supporting documents in the docket folder to find additional related documents to this rule.
Compliance
Inspection Tool for the Miscellaneous Organic Chemical Manufacturing NESHAP (pdf)