Section R18-2-218. Limitation of Pollutants in Classified Attainment Areas

A.      Areas designated as Class I, II, or III shall be limited to the fol- lowing increases in air pollutant concentrations occurring over the baseline concentration; provided that for any period other than an annual period, the applicable maximum allowable increase may be exceeded once per year at any one location:

CLASS I

Maximum Allowable Increase (Micrograms per cubic meter) Particulate matter: PM2.5

Annual arithmetic mean                          1

24-hr maximum                                      2

Particulate matter: PM10

Annual arithmetic mean                          4

24-hour maximum                                  8

Sulfur dioxide:

Annual arithmetic mean                          2

24-hour maximum                                  5

3-hour maximum                                    25

Nitrogen dioxide:

Annual arithmetic mean                          2.5

CLASS II

Particulate matter: PM2.5

Annual arithmetic mean                             4

24-hr maximum                                         9

Particulate matter: PM10

Annual arithmetic mean                          17

24-hour maximum                                  30

Sulfur dioxide:

Annual arithmetic mean                          20

24-hour maximum                                  91

3-hour maximum                                    512

Nitrogen dioxide:

Annual arithmetic mean                          25

CLASS III

Particulate matter: PM2.5

Annual arithmetic mean                             8

24-hr maximum                                         18

Particulate matter: PM10

Annual arithmetic mean                          34

24-hour maximum                                  60

Sulfur dioxide:

Annual arithmetic mean                          40

24-hour maximum                                  182

3-hour maximum                                    700

Nitrogen dioxide:

Annual arithmetic mean                          50

B.       The baseline concentration shall be that ambient concentration level which exists in the baseline area at the time of the appli- cable minor source baseline data.

1.        The major source baseline date is:

a.         January 6, 1975, for sulfur dioxide and PM10.

b.        February 8, 1988, for nitrogen dioxide.

c.         October 20, 2010, for PM2.5.

2.        The minor source baseline date shall be the earliest date

after the trigger date on which a major source as defined in R18-2-401 or major modification subject to 40 CFR

52.21 or R18-2-406 submits a complete application under the relevant regulations. The trigger date is:

a.         August 7, 1977, for PM10 and sulfur dioxide.

b.        February 8, 1988, for nitrogen dioxide.

c.         October 20, 2011, for PM2.5.

3.        A baseline concentration shall be determined for each

pollutant for which there is a minor source baseline date and shall include both:

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a.         The actual emissions representative of sources in existence on the minor source baseline date, except as provided in subsection (B)(4); and

b.        The allowable emissions of major sources as defined in R18-2-401 which commenced construction before the major source baseline date but were not in opera- tion by the applicable minor source baseline date.

4.        The following shall not be included in the baseline con- centration and shall affect the applicable maximum allowable increase:

a.         Actual emissions from any major source as defined in R18-2-401 on which construction commenced after the major source baseline date; and

b.        Actual emissions increases and decreases at any sta- tionary source occurring after the minor source base- line date.

C.      The baseline date shall be established for each pollutant for which maximum allowable increases or other equivalent mea- sures have been established if both:

1.        The area in which the proposed source or modification would construct is designated as attainment or unclassifi- able under section 107(d)(1)(A)(ii) or (iii) of the Act for the pollutant on the date of its complete application under 40 CFR 52.21 or R18-2-406; and

2.        In the case of a major source as defined in R18-2-401, the pollutant would be emitted in significant amounts, or in the case of a major modification, there would be a signif- icant net emissions increase of the pollutant.

D.      The baseline area shall be the AQCR that contains the area, designated as attainment or unclassifiable under section 107(d)(1)(A)(ii) or (iii) of the Act, in which the major source as defined in R18-2-401 or major modification establishing the minor source baseline date would construct or would have an air quality impact for the pollutant for which the minor source baseline date is established, as follows: greater than or equal to 1 microgram per cubic meter (annual average) for sulfur diox- ide, nitrogen dioxide or PM10; or greater than or equal to 0.3

microgram per cubic meter (annual average) for PM2.5. Area

redesignations   under  R18-2-217   that  would  redesignate  a

baseline area may not intersect or be smaller than the area of impact of any new major source as defined in R18-2-401 or a major modification which either:

1.        Establishes a minor source baseline date, or

2.        Is subject to either 40 CFR 52.21 or R18-2-406 and would be constructed in Arizona.

E.       The maximum allowable concentration of any air pollutant in any area to which subsection (A) applies shall not exceed a concentration for each pollutant equal to the concentration per- mitted under the ambient air quality standards contained in this Article.

F.       For purposes of determining compliance with the maximum allowable increases in ambient concentrations of an air pollut- ant, the following concentrations of such pollutant shall not be taken into account:

1.        Concentration of such pollutant attributable to the increase in emissions from major and stationary sources which have converted from the use of petroleum prod- ucts, or natural gas, or both, by reason of a natural gas curtailment order which is in effect under the provisions of sections 2(a) and (b) of the Energy Supply and Envi- ronmental Coordination Act of 1974, 15 U.S.C. 792, over the emissions from such sources before the effective date of such order;

2.        The concentration of such pollutant attributable to the increase in emissions from major and stationary sources which have converted from using gas by reason of a natu-

ral gas curtailment plan in effect pursuant to the Federal Power Act, 16 U.S.C. 792 - 825r, over the emissions from such sources before the effective date of the natural gas curtailment plan;

3.        Concentrations of PM10 attributable to the increase in emissions from construction or other temporary activities of a new or modified source;

4.        The increase in concentrations attributable to new sources outside the United States over the concentrations attribut- able to existing sources which are included in the baseline concentration; and

5.        Concentrations attributable to the temporary increase in emissions of sulfur dioxide, nitrogen oxides, or PM10 from major sources as defined in R18-2-401 when the following conditions are met:

a.         The operating permit issued to such sources speci- fies the time  period during which the temporary emissions increase of sulfur dioxide, nitrogen oxides, or PM10 would occur. Such time period shall not be renewable and shall not exceed two years unless a longer period is specifically approved by

the Director.

b.        No emissions increase shall be approved which would either:

i.         Impact any portion of any Class I area or any portion of any other area where an applicable incremental ambient standard is known to be violated in that portion; or

ii.        Cause or contribute to the violation of a state ambient air quality standard.

c.         The operating permit issued to such sources speci- fies that, at the end of the time period described in subsection (F)(5)(a), the emissions levels from the sources would not exceed the levels occurring before the temporary emissions increase was approved.

6.        The exception granted with respect to increment con- sumption under subsections (F)(1) and (2) shall not apply more than five years after the effective date of the order or natural gas curtailment plan on which the exception is based.

G.      If the Director or the Administrator determines that the SIP is substantially inadequate to prevent significant deterioration or that an applicable maximum allowable increase as specified in subsection (A) is being violated, the SIP shall be revised to correct the inadequacy or the violation. The SIP shall be revised within 60 days of such a finding by the Director or within 60 days following notification by the Administrator, or by such later date as prescribed by the Administrator after con- sultation with the Director.

H.      The Director shall review the adequacy of the SIP on a peri- odic basis and within 60 days of such time as information becomes available that an applicable maximum allowable increase is being violated.

Historical Note

Adopted effective May 14, 1979 (Supp. 79-1). Amended

effective October 2, 1979 (Supp. 79-5). Editorial correc- tion, subsection (A), paragraph (5), subparagraph (d) (Supp. 80-2). Amended effective May 28, 1982 (Supp. 82-3). Former Section R9-3-217 renumbered without change as Section R18-2-217 (Supp. 87-3). Former Sec- tion R18-2-218 renumbered to R18-2-219, new Section R18-2-218 renumbered from R18-2- 217(B) and amended effective September 26, 1990 (Supp. 90-3).

Amended effective November 15, 1993 (Supp. 93-4).

Amended effective February 28, 1995 (Supp. 95-1).

Department of Environmental Quality – Air Pollution Control

Amended by final rulemaking at 18 A.A.R. 1542, effec- tive August 7, 2012 (Supp. 12-2).