Hazardous Air Pollutants

Hazardous air pollutants are defined by the Federal Clean Air Act as pollutants that cause or may cause cancer or other serious health effects, such as reproductive effects or birth defects, or adverse environmental and ecological effects. MDEQ implements hazardous air pollutant regulations that include Maximum Achievable Control Technology (MACT) standards and other National Emission Standards for Hazardous Air Pollutants (NESHAP) and also provides technical assistance for the requirements of regulations to anyone who may be interested. A list of Hazardous Air Pollutants can be viewed here.

MDEQ Activities Include:

Processing regulation promulgations and amendments and identification of regulated facilities within the state
Providing technical assistance for the requirements of regulations to anyone who may be interested
Air Toxics Monitoring



Consolidated Federal Register Versions of the NESHAP Rules (e-CFR)

40 CFR Part 61 NESHAP, Subparts A through FF (61.01 through 61.359)
40 CFR Part 63 NESHAP, Subparts A through Z (63.1 through 63.599)
40 CFR Part 63 NESHAP, Subparts AA through DDD (63.600 through 63.1199)
40 CFR Part 63 NESHAP, Subparts EEE through PPP (63.1200 through 63.1439)
40 CFR Part 63 NESHAP, Subparts QQQ through YYYY (63.1440 through 63.6175)
40 CFR Part 63 NESHAP, Subparts ZZZZ through MMMMM (63.6580 through 63.8830)
40 CFR Part 63 NESHAP, Subparts NNNNN through HHHHHHH (63.8980 through 63.12005)

NESHAP Guidance:

Major Source Rules
Area Source General Information
Area Source Rule Compilation
Guidance for Paint Stripping and Miscellaneous Surface Coating Operations, 40 CFR Part 63, Subpart HHHHHH
Area Source Boiler Rule – 40 CFR Part 63, Subpart JJJJJJ

FREE, Non-regulatory, Confidential and On-site Technical Assistance is available per request through the Mississippi Small Business Environmental Assistance Program (SBEAP). For more information, call the SBEAP Hot Line at 800-725-6112 or visit the Small Business Technical Assistance Program website.

Other Information:

EPA’s Air Toxics Website
Air Toxics Monitoring

      Ambient air monitoring for hazardous air pollutants has been done at various locations (link below) throughout the state off and on from May of 2001 through December of 2013. The specific monitoring efforts have included the characterization of air quality for concentrations of common hazardous air pollutant emissions in areas of more likely incidence of elevated levels. These efforts have included the EPA’s Urban Air Toxics Monitoring Program, an evaluation of ambient air quality impacts following Hurricane Katrina, participation in EPA’s Air Toxics in Schools Study, and a study to evaluate ambient air concentrations in Columbus, MS.

      The data produced from these efforts, available through the link below, provided a favorable picture of air quality for the pollutants and areas monitored, indicating no problem or troublesome conditions that warranted corrective actions.

    Contacts: For more information concerning Hazardous Air Pollutants, you may contact the Air Toxics Branch