An official website of the United States government.

This is not the current EPA website. To navigate to the current EPA website, please go to This website is historical material reflecting the EPA website as it existed on January 19, 2021. This website is no longer updated and links to external websites and some internal pages may not work. More information »

Louisiana SIP: LAC 33:III Ch. 15 Section 1503. Emission Limitations; SIP effective 1993-09-13 (LAc59) to 2011-08-03

Regulatory Text: 
Louisiana Administrative Code, Title 33 ENVIRONMENTAL QUALITY, Part III Air (LAC 33:III)

Chapter 15. Emission Standards for Sulfur Dioxide

Section 1503.  Emission Limitations
As adopted in the Louisiana Register April 20, 1992 (LR 18:0374) (AQ057)
Approved by EPA July 15, 1993 (58 FR 38060) effective September 13, 1993 (LAc59)

   As used in this Section a three-hour average means the average emissions for any three consecutive one- hour periods (each commencing on the hour), provided that the number of three-hour periods during which the SO2 limitation is exceeded is not greater than the number of one-hour periods during which the SO2 limitation is exceeded.

   A.  Sulfuric Acid Plants New and Existing. The emissions of sulfur dioxide and acid mist from new sulfuric acid production units which commence construction or modification after August 17, 1971 shall be limited to that specified in LAC 33:III.3232 and 3233, i.e. 4.0 pounds/ton of 100 percent H2SO4 (2 kilograms/metric ton) and 0.15 pounds/ton of 100 percent H2SO4 (.075 kilograms/metric ton) respectively (three-hour averages).

Emissions from existing units shall be limited as follows:

SO2-not more than 2000 ppm by volume (three-hour average);

acid mist-not more than 0.5 pounds/ton of 100 percent H2SO4
(three-hour average).

   B.  Sulfur Recovery Plants-New and Existing. The emission of sulfur oxides calculated as sulfur dioxide from a new sulfur recovery plant which commences construction or modification after October 4, 1976 shall be limited to that specified in LAC 33:III.3264.A.2.  The emission of sulfur oxides calculated as sulfur dioxide from an existing plant shall be limited to a sulfur dioxide concentration of not more than 1,300 ppm by volume (three-hour average).

   C.  All Other Sources-New and Existing not elsewhere discussed. No person shall discharge gases from the subject sources which contain concentrations of SO2, which exceed 2000 parts per million (ppm) by volume at standard conditions (three-hour average), or any applicable Federal NSPS emission limitation, whichever is more stringent. Units emitting less than 250 tons per year of sulfur compounds measured as sulfur dioxide may be exempted from the 2000 ppm(v) limitation by the administrative authority.

   D.  Measurement of Concentrations

       1.  Analytical Methods. The methods listed in Table 4 or such equivalent method as may be approved by the administrative authority* shall be utilized to determine sulfur dioxide and sulfuric acid mist concentrations in stack gases.  These methods are to be used for initial compliance determinations and for additional compliance determinations for those facilities not subject to continuous emission monitoring.

   2.  Calibration of Equipment Required. Measurement equipment shall be periodically calibrated to comply with minimal American Bureau of Standards Criteria.

   AUTHORITY NOTE:  Promulgated in accordance with R.S. 30:2054.
   HISTORICAL NOTE:  Promulgated by the Department of Environmental Quality, Office of Air Quality and Nuclear Energy, Air Quality Division in LR 13:741 (December 1987), amended by the Office of Air Quality and Radiation Protection, Air Quality Division, LR 18:374 (April 1992).

********************** end section 1503 ******************86t**