Ariz. Admin. Code § R18-2-218 - Limitation of Pollutants in Classified Attainment Areas

A. Areas designated as Class I, II, or III shall be limited to the following 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 is that ambient concentration level which exists in the baseline area at the time of the applicable 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 PM_2.5.

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.

a. The trigger date is:

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

b ii. February 8, 1988, for nitrogen dioxide.

c iii. October 20, 2011, for PM_2.5.

b. Any minor source baseline date established originally for total suspended particulates shall remain in effect and shall apply for purposes of determining the amount of available PM-10 increments, except that the Department may rescind any such minor source baseline date where it can be shown, to the satisfaction of the Department, that the emissions increase from the major source, or the net emissions increase from the major modification, responsible for triggering that date did not result in a significant amount of PM-10 emissions.

3. A baseline concentration shall be determined for each pollutant for which there is a minor source baseline date and shall include both:

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 operation by the applicable minor source baseline date.

4. The following shall not be included in the baseline concentration 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 stationary source occurring after the minor source baseline date.

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

1. The area in which the proposed source or modification would construct is designated as attainment or unclassifiable 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 significant 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 dioxide, nitrogen dioxide or PM₁₀; or greater than or equal to 0.3 microgram per cubic meter (annual average) for PM_2.5.

1. Area redesignations under section 107(d)(1)(A)(ii) or (iii) of the Act 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 a. Establishes a minor source baseline date, or

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

2. Any baseline area established originally for total suspended particulates shall remain in effect and shall apply for purposes of determining the amount of available PM-10 increments, except that such baseline area shall not remain in effect if the Department rescinds the corresponding minor source baseline date in accordance with subsection (B)(2)(b).

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 permitted under the national ambient air quality standards.

F. For purposes of determining compliance with the maximum allowable increases in ambient concentrations of an air pollutant, 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 products, 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 Environmental 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 natural 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 or PM_2.5 attributable to the increase in emissions from construction or other temporary emission related activities of a new or modified source;

4. The increase in concentrations attributable to new sources outside the United States over the concentrations attributable 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, PM_2.5, or PM₁₀ from major sources as defined in R18-2-401 when the following conditions are met:

a. The permits issued to such sources specify the time period during which the temporary emissions increase of sulfur dioxide, nitrogen oxides, PM_2.5 or PM₁₀ would occur. Such time period shall not be renewable and shall not exceed two years.

b. The temporary emissions increase will not:

i. Impact any Class I area or any area where a maximum increase allowed by subsection (A) is known to be violated; or

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

c. The operating permit issued to such sources specifies 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 by subsections (F)(1) and (2) with respect to maximum increases allowed under subsection (A) 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 consultation with the Director.

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

Notes

Ariz. Admin. Code § R18-2-218

Adopted effective May 14, 1979 (Supp. 79-1). Amended effective October 2, 1979 (Supp. 79-5). Editorial correction, 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 Section 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). Amended by final rulemaking at 18 A.A.R. 1542, effective August 7, 2012 (Supp. 12-2). Amended by final rulemaking at 23 A.A.R. 333, effective 3/21/2017.