1. A. A person who owns or operates a cement kiln at a Portland cement manufacturing plant shall meet the following applicable NO_x emission standards:

   1. (1) For long dry kilns, maximum emissions of 5.1 pounds of NO_x per ton of clinker produced; and
   2. (2) For pre-calciner kilns, maximum emissions of 2.8 pounds of NO_x per ton of clinker produced.
2. B. On and after April 1, 2017, the requirements in §A of this regulation no longer apply and cement kilns shall meet the applicable NO_x emission standards in §C of this regulation.

3. C. On and after April 1, 2017, a person who owns or operates a cement kiln at a Portland cement manufacturing plant shall meet the following applicable NO_x emission standards:

   1. (1) For long dry kilns, maximum emissions of 3.4 pounds of NO_x per ton of clinker produced; and
   2. (2) For pre-calciner kilns, maximum emissions of 2.4 pounds of NO_x per ton of clinker produced.
4. D. Compliance with the emission standards in §§A and C of this regulation shall be demonstrated as a 30-day rolling average.

Authority: Environment Article, §§1-101, 1-404, 2-101—2-103, 2-301—2-303, 10-102, and 10-103, Annotated Code of Maryland

Effective date: July 20, 2015 (42: Md. R. 884)