EPA places standards, or requirements, on categories of stationary sources that emit (or have the potential to emit) one or more hazardous air pollutants (HAPs). EPA listed these standards, called National Emission Standards for Hazardous Air Pollutants (NESHAP) standards, and which agency enforces the standards in tables published in the Federal Register, 80 FR 10596, Feb. 27, 2015.

  • Major source of hazardous air pollutants: 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 named HAPs, or 25 tons per year of a mixture of pollutants.
  • Area source of hazardous air pollutants: 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.

EPA places NESHAP Area Source Standards on area sources to minimize emissions, which reduces the hazardous area pollutants released by the area sources. 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.

Missouri's Area Source Requirements

The Missouri Department of Natural Resources is conducting compliance and enforcement activities for area source requirements in the following table. For questions regarding standards, compliance and reports about area sources, please contact the agency listed as “Regulating Agency” in the table. If you need help navigating the requirements, contact the department's Air Pollution Control Program. The department recommends that facilities submit notifications and other required reports about area sources to the department's Air Pollution Control Program and EPA Region 7 Air Technology Standards Contacts.

Online Compliance Resources

Regulating Agency Description 40 CFR 63 Subpart Title V Permit Keywords Rule and Implementation Information Regulation Helpful Link
MoDNR Publicly Owned Treatment Works Regulations (Major and area sources) (3V) - VVV Exempt sewer company https://www.epa.gov/stationary-sources-air-pollution/clean-air-act-guidelines-a… http://www.ecfr.gov/cgi-bin/text-idx?c=ecfr&SID=7045a499ccaf0f15949ec6d5dc7332c…
EPA Reciprocating Internal Combustion Engines (Area sources) (4Z) - ZZZZ Exempt Internal Combustion Engines https://www.epa.gov/stationary-engines http://www.ecfr.gov/cgi-bin/text-idx?c=ecfr&rgn=div6&view=text&node=40%3A14.0.1… http://www.epa.gov/ttn/atwfiles/area/riceb.pdf
MoDNR Reciprocating Internal Combustion Engines (Major sources) (4Z) - ZZZZ Exempt Internal Combustion Engines https://www.epa.gov/stationary-engines http://www.ecfr.gov/cgi-bin/text-idx?c=ecfr&rgn=div6&view=text&node=40:14.0.1.1… http://www.epa.gov/ttn/atwfiles/area/riceb.pdf
MoDNR Secondary Aluminum Production (Major and area sources) (3R) - RRR Exempt aluminum https://www.epa.gov/stationary-sources-air-pollution/clean-air-act-standards-an… http://www.ecfr.gov/cgi-bin/text-idx?c=ecfr&SID=7045a499ccaf0f15949ec6d5dc7332c…
EPA Secondary Copper Smelting (6F) - FFFFFF Major Permit copper http://www.ecfr.gov/cgi-bin/text-idx?c=ecfr&rgn=div6&view=text&node=40:15.0.1.1…
MoDNR Secondary Lead Smelting (Major and area sources) (1X) - X Major Permit lead https://www.epa.gov/stationary-sources-air-pollution/clean-air-act-standards-an… http://www.ecfr.gov/cgi-bin/text-idx?c=ecfr&SID=0fab4e3a092ebbe349e93a960469826…
EPA Secondary Nonferrous Metals Processing (6T) - TTTTTT Exempt Nonferrous metals http://www.ecfr.gov/cgi-bin/text-idx?c=ecfr&SID=b8bdf102db32e7c1223ae6621a9ffe5… http://www.epa.gov/ttn/atwfiles/area/nonferrous2ndb.pdf
EPA Wood Preserving Industry (6Q) - QQQQQQ Exempt wood preserving http://www.ecfr.gov/cgi-bin/text-idx?c=ecfr&SID=d86303fee8e687ea24daffdc4bdb1c7… http://www.epa.gov/ttn/atwfiles/area/wood_preservingb.pdf
EPA Wool Fiberglass Manufacturing at Area Sources (2N) - NN Major Permit fiberglass, Wool https://www.federalregister.gov/articles/2015/07/29/2015-16643/national-emissio… http://www.ecfr.gov/cgi-bin/text-idx?SID=29e787ace826c575c33c64c432b378f5&mc=tr…