A. Areas designated as Class I, II, or III shall be limited to the increases in air pollutant concentrations shown in Table 17.08.150 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.
B. The baseline concentration shall be that ambient concentration level which exists in the baseline area at the time of the applicable minor source baseline date.
1. The major source baseline date is:
a. January 6, 1975 for sulfur dioxide and particulate matter; and
b. February 8, 1988 for nitrogen dioxide.
2. The minor source baseline date shall be the earliest date after August 7, 1977 for sulfur dioxide and particulate matter, and February 8, 1988 for nitrogen dioxide, that either:
a. A major source as defined in Chapter 17.04, Article IX, or a major modification submits a complete permit application to the administrator under 40 CFR 52.21; or
b. A major source as defined in Chapter 17.04, Article IX, or a major modification submits a complete permit application to the control officer under Section 17.12.010(F) or Section 17.13.010(E).
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 paragraph 4 of this subsection; and
b. The allowable emissions of major sources as defined in Chapter 17.04, Article IX, which commenced construction before the major source base.
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 Chapter 17.04, Article IX, 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 for the pollutant on the date of its complete application under either subsection (B)(2)(a) or (b); and
2. In the case of a major source as defined in Chapter 17.04, Article IX, 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 any area, within any intrastate area designated as attainment or unclassifiable, in which the major source as defined in Chapter 17.04, Article IX, or a major modification establishing the minor source baseline date would construct or would have an air quality impact equal to or greater than 1 ìg/m 3 (annual average) of the pollutant for which the minor source baseline date is established. Area redesignations under Section 17.08.100 cannot intersect or be smaller than the area of impact of any new major source as defined in Chapter 17.04, Article IX, or a major modification which either:
1. Establishes a minor source baseline date; or
2. Is subject to either 40 CFR 52.21 or Chapter 17.16, Article VIII, and would be constructed in Arizona.
E. The maximum allowable concentration of any air pollutant in any area to which subsection (A) of this section applies shall not exceed a concentration for each pollutant equal to the concentration permitted under the ambient air quality standards contained in Article I of this Chapter.
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 particulate matter attributable to the increase in emissions from construction or other temporary activities of a new or altered 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 or particulate matter from major sources as defined in Chapter 17.04, Article IX, when the following conditions are met:
a. The permit issued to such sources specifies the time period during which the temporary emissions increase of sulfur dioxide, nitrogen oxides or particulate matter would occur. Such time period shall not be renewable and shall not exceed two years unless a longer period is specifically approved by the control officer.
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 permit issued to such sources specifies that at the end of the time period described in paragraph a of this subdivision, 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 consumption under subdivisions 1 and 2 of subsection F 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 control officer 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) of this section 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 control officer or within 60 days following notification by the administrator, or by such later date as prescribed by the administrator after consultation with the control officer.
H. The control officer 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.
Class I Areas
Pollutant | Applicable Standard | Maximum Allowable Increase (ìg/m 3 ) |
PM 10 | Annual arithmetic mean | 4 |
PM 10 | 24-hour maximum | 8 |
SO 2 | Annual arithmetic mean | 2 |
SO 2 | 24-hour maximum | 5 |
SO 2 | 3-hour maximum | 25 |
NO 2 | Annual arithmetic mean | 2.5 |
Class II Areas
Pollutant | Applicable Standard | Maximum Allowable Increase (ìg/m 3 ) |
PM 10 | Annual arithmetic mean | 17 |
PM 10 | 24-hour maximum | 30 |
SO 2 | Annual arithmetic mean | 20 |
SO 2 | 24-hour maximum | 91 |
SO 2 | 3-hour maximum | 512 |
NO 2 | Annual arithmetic mean | 25 |
Class III Areas
Pollutant | Applicable Standard | Maximum Allowable Increase (ìg/m 3 ) |
PM 10 | Annual arithmetic mean | 34 |
PM 10 | 24-hour maximum | 60 |
SO 2 | Annual arithmetic mean | 40 |
SO 2 | 24-hour maximum | 182 |
SO 2 | 3-hour maximum | 700 |
NO 2 | Annual arithmetic mean | 50 |
(Ord. 2017-20 § 1 (part), 2017: Ord.1993-128 § 2 (part), 1993)