BEFORE THE 

ENVIRONMENTAL QUALITY COUNCIL 

STATE OF WYOMING 

IN THE MATTER OF REVISIONS TO SECTIONS ) 

TWO AND NINE OF CHAPTER THREE; REVISIONS ) 

TO SECTIONS ONE AND FIVE, AND THE ADDITION ) 

OF SECTION SIX TO CHAPTER FOUR; REVISIONS ) 

TO SECTIONS TWO, THREE AND FOUR OF ) 

CHAPTER FIVE; REVISIONS TO SECTIONS FOUR ) 

AND FOURTEEN OF CHAPTER SIX; REVISIONS TO ) 

SECTIONS ONE AND FIVE, AND THE ADDITION OF ) 

SECTIONS SIX, SEVEN, EIGHT, NINE AND TEN OF ) 

CHAPTER EIGHT; AND REVISIONS TO SECTION ) 

TWO OF CHAPTER ELEVEN OF THE WYOMING ) 

AIR QUALITY STANDARDS AND REGULATIONS ) 

STATEMENT OF 

PRINCIPAL REASONS 

FOR ADOPTION 

1. The Environmental Quality Council, pursuant to the authority vested in it by the 

Wyoming Statutes 35-11-112 (a) (i), has revised, removed, or added the following 

chapters and sections to the Wyoming Air Quality Standards and Regulations: Chapter 3, 

General Emission Standards, Section 2, Emission standards for particulate matter, and 

Section 9, Incorporation by reference; Chapter 4, State Performance Standards for 

Specific Existing Sources, Section 1, Introduction to state performance standards for 

specific existing sources, Section 5, Existing hospital/medical/infectious waste 

incinerators, and Section 6, Incorporation by reference; Chapter 5, National Emission 

Standards, Section 2, New source performance standards, Section 3, National emission 

standards for hazardous air pollutants, and Section 4, Incorporation by reference; Chapter 

6, Permitting Requirements, Section 4, Prevention of significant deterioration, and 

Section 14, Incorporation by reference; Chapter 8, Nonattainment Area Regulations, 

Section 1, Introduction to nonattainment area regulations, Section 5, Ozone 

nonattainment emission inventory rule, Section 6, Reserved, Section 7, Reserved, Section 

8, Reserved, Section 9, Reserved, and Section 10, Incorporation by reference; and 

Chapter 11, National Acid Rain Program, Section 2, Acid rain program. 

2. Section 35-11-202 (a) of the Environmental Quality Act states that the Administrator, 

after consultation with the Advisory Board, shall recommend to the Director such 

ambient air standards and regulations that may be necessary to prevent, abate, or control 

pollution. 
4. Chapter 4, State Performance Standards for Specific Existing Sources, Section 1, 

Introduction to state performance standards for specific existing sources, has been revised 

to reflect the addition of Section 6, Incorporation by reference. Section 5, Existing 

hospital/medical/infectious waste incinerators, is outdated and has been revised to 

maintain consistency with the federal regulations. Section 6, Incorporation by reference, 

has been added to reference all CFR citations in Chapter 4 as of July 1, 2012. 

5. Chapter 5, National Emission Standards, Section 2, New source performance standards, 

Section 3, National emission standards for hazardous air pollutants, and Section 4, 

Incorporation by reference, and Chapter II, National Acid Rain Program, Section 2, Acid 

rain program, have been updated as an annual effort to adopt by reference from the CFR 

as of July 1, 2012 and relevant sections ofthe August 16,2012 Federal Register. 

6. Chapter 5, National Emission Standards, Section 2, New source performance standards, 

has been revised to update the definition of"commenced" to make the definition 

consistent with the federal definition. Section 3, National emission standards for 

hazardous air pollutants, was revised to update footnotes at the bottom of the hazardous 

air pollutants table near the end of Section 3. 

7. Chapter 6, Permitting Requirements, Section 4, Prevention of significant deterioration, 

has been revised to specifically list new minor source baseline dates for fine particulate, 

include revised federal language on the treatment of condensable particulate matter, and 

clarify when the maximum allowable increment is exceeded for particulate matter. 

Section 14, Incorporation by reference, was updated to adopt by reference from the CFR 

as ofJuly I, 2012. Section 4, Prevention of significant deterioration, and Section 14, 

Incorporation by reference, involve changes to the SIP. 

8. Chapter 8, Nonattainment Area Regulations, Section I, Introduction to nonattainment 

area regulations, has been revised to reflect the reorganization and addition of new 

sections to the chapter. Section 5, Ozone nonattainment emission inventory rule, is a new 

rule to establish requirements for the submittal of emission inventories from facilities or 

sources located in an ozone nonattainment area pursuant to the requirements of the Clean 

Air Act (CAA), Section 182. Section placeholder numbers for Sections 6, 7, 8, and 9 are 

being added and reserved for future rulemaking purposes. Section I 0, Incorporation by 

reference (formerly Section 5), is being updated to adopt by reference from the CFR as of 

July I, 2012. Section 5, Ozone nonattainment emission inventory rule, and Section 10, 

Incorporation by reference, involve changes to the SIP. 

The Council finds that these regulations are reasonable and necessary to accomplish the policy