What is an Area Source of Hazardous Air Pollutants? Why is it regulated?
Hazardous air pollutants (HAPs) are known or suspected to cause adverse environmental effects and/or serious health effects. The U.S. Environmental Protection Agency (EPA) has identified 187 air pollutants, for example, benzene, which is found in gasoline. EPA places standards, or requirements on categories of stationary sources that emit (or have the potential to emit) one or more hazardous air pollutants called national emission standards for hazardous air pollutants (NESHAP) standards. EPA lists these standards and which agency enforces the standards in tables published in the Federal Register.
Major source of hazardous air pollutants: The term "major source" refers to any stationary source or group of stationary sources that emits or has the potential to emit 10 tons per year of any of the 187 named pollutants, or 25 tons per year of a mixture of pollutants.
Area source of hazardous air pollutants: The term "area source" refers to facilities that release smaller quantities of toxic air pollutants. Although emission from one area source may be relatively small, multiple area sources concern environmental specialists, especially when they are in densely populated areas.
To reduce the hazardous area pollutants released by area sources, EPA places standards, or requirements, on area sources to minimize emissions. These requirements call for specific management practices and generally available control technologies (GACT). These technologies consist of methods, practices, and techniques applicable to area sources. When EPA developed these technologies, staff members considered the economic impact as well as the technical abilities of employees to operate and maintain systems for emission control.
What are Missouri's Area Source Requirements?
The following table gives area source requirements for which the Missouri Department of Natural Resources is conducting compliance-enforcement activities. Direct questions regarding standards, compliance, and reports about area sources to the agency listed as “Regulating Agency” in the table, below. The department's Air Pollution Control Program recommends that facilities submit notifications and other required reports about area sources to the air program and EPA Region 7 contacts. If you have questions regarding any of the area source regulations or need help navigating the requirements, contact the Air Pollution Control Program.
Online Compliance Resources for Missouri Area Source Requirements
| Regulating Agency | Description | 40 CFR 63 Subpart | Title V Permit Sort descending | Keywords | Rule and Implementation Information | Regulation | Helpful Link |
|---|---|---|---|---|---|---|---|
| EPA | Nine Metal Fabrication and Finishing Source Categories | (6X) - XXXXXX | Exempt | Metal Fabrication and Finish | Link | Link | Link |
| MoDNR | Oil and Natural Gas Production Facilities (Major and area sources) | (2H) - HH | Exempt | Oil and Natural Gas | Link | Link | |
| EPA | Paint Stripping and Miscellaneous Surface Coating Operations | (6H) - HHHHHH | Exempt | Paint | Link | Link | Link |
| EPA | Paints and Allied Products Manufacturing | (7C) - CCCCCCC | Exempt | Paint | Link | ||
| EPA | Plating and Polishing Operations | (6W) - WWWWWW | Exempt | Plating and Polishing | Link | Link | Link |
| EPA | Acrylic and Modacrylic Fibers Production | (6L) - LLLLLL | Exempt | acrylic fibers | Link | ||
| EPA | Polyvinyl Chloride and Copolymers Production | (6D) - DDDDDD | Exempt | Polyvinyl Chloride | Link | Link | |
| EPA | Aluminum, Copper and Other Nonferrous Foundries | (6Z) - ZZZZZZ | Exempt | aluminum, Copper | Link | Link | |
| EPA | Asphalt Processing and Asphalt Roofing Manufacturing | (7A) - AAAAAAA | Exempt | asphalt | Link | Link | |
| EPA | Prepared Feeds Manufacturing | (7D) - DDDDDDD | Exempt | animal feed | Link | Link | Link |
| EPA | Chemical Preparations Industry | (7B) - BBBBBBB | Exempt | chemical | Link | Link | |
| EPA | Clay Ceramics Manufacturing Industry | (6R) - RRRRRR | Exempt | Ceramics | Link | Link | |
| MoDNR | Publicly Owned Treatment Works Regulations (Major and area sources) | (3V) - VVV | Exempt | sewer company | Link | Link | |
| MoDNR | Reciprocating Internal Combustion Engines (Major sources) | (4Z) - ZZZZ | Exempt | Internal Combustion Engines | Link | Link | Link |
| MoDNR | Dry Cleaning Facilities (Major and area sources) | (1M) - M | Exempt | dry cleaning | Link | Link | Link |
| EPA | Reciprocating Internal Combustion Engines (Area sources) | (4Z) - ZZZZ | Exempt | Internal Combustion Engines | Link | Link | Link |
| MoDNR | Secondary Aluminum Production (Major and area sources) | (3R) - RRR | Exempt | aluminum | Link | Link | |
| MoDNR | Ethylene Oxide Emissions Standards for Sterilization Facilities (Major and area sources) | (1O) - O | Exempt | Ethylene Oxide | Link | Link | |
| EPA | Ferroalloys Production Facilities | (6Y) - YYYYYY | Exempt | Ferroalloy | Link | Link | |
| EPA | Flexible Polyurethane Foam Production & Fabrication Industry | (6O) - OOOOOO | Exempt | Polyurethane foam | Link | Link |