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New York Codes, Rules and Regulations
Title 6 - DEPARTMENT OF ENVIRONMENTAL CONSERVATIONChapter III - AIR RESOURCESSubchapter A - PREVENTION AND CONTROL OF AIR CONTAMINATION AND AIR POLLUTIONPart 231 - NEW SOURCE REVIEW FOR NEW AND MODIFIED FACILITIES
Subpart 231-6 - Modifications to Existing Major Facilities in Nonattainment Areas and Attainment Areas of the State within the Ozone Transport Region
Section 231-6.6 - Emission offset requirements

N.Y. Comp. Codes R. & Regs. Tit. 6 §§ 231-6.6

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Current through Register Vol. 46, No. 45, November 2, 2024
Section 231-6.6 - Emission offset requirements
(a) 'Emission offset applicability'. For a NSR major modification, the project emission potential must be offset.
(b) 'Offset ratio'.
(1) An emission offset of VOC or NOx must exceed the corresponding project emission potential (subsequent to application of LAER), as appropriate, by the applicable offset ratio specified in Subpart 231-13 of this Part. A greater offset ratio may be required, on a case by case basis, to provide an acceptable contribution demonstration as set forth in this section.
(2) An emission offset of PM-10 must at least equal (offset ratio of one to one or greater) the corresponding project emission potential (subsequent to application of LAER), as appropriate, by the applicable offset ratio specified in Subpart 231-13 of this Part. A greater offset ratio may be required to provide a net air quality benefit as set forth in this section.
(3) An emission offset of PM-2.5 (including applicable precursors) must at least equal (offset ratio of one to one or greater) the corresponding facility potential to emit or project emission potential of the same pollutant (subsequent to application of LAER), as appropriate, by the applicable offset ratio specified in Subpart 231-13 of this Part. A greater offset ratio may be required to provide a net air quality benefit as set forth in this section.
(c) 'Use of an ERC as an emission offset'. An ERC must meet the following requirements to be used as an emission offset:
(1) for NOx, PM-10, and VOC emissions, ERCs must have physically occurred on or after November 15, 1990 but need not be contemporaneo us;
(2) for PM-2.5 (including its precursors SO2 a n d N Ox), ERCs must have physically occurred on or after April 5, 2005 but need not be contemporaneous;
(3) an ERC, or portion thereof, must be included as a condition in the permit f or the proposed NSR major modification for which the reduction is used.
(d) 'Net air quality benefit and emission offset location f or PM-10, or PM-2.5 (including applicable precursors)'. An emission offset of PM-10, or PM-2.5 (including applicable precursors) must meet the following requirements:
(1) Contribution demonstration. An emission offset may be obtained from the same nonattainment area in which a proposed NSR major modification is to be located. An emission offset may also be obtained from other nonattainment areas of equal or higher classification if emissions from such other areas contribute to a violation of the NAAQS for PM-10 or PM-2.5 in the nonattainment area where the proposed NSR major modification is to be located. These other areas must be determined in accordance with department approved modeling procedures.
(2) Net air quality benefit demonstration. As part of a permit application, the applicant must submit an air quality impact evaluation for PM-10 and PM-2.5, as applicable, in accordance with department approved modeling procedures. The ambient air quality impact analysis must demonstrate that:
(i) the net impact of the proposed emissions increase and the emission offset provides for a net benefit, on balance, in the area affected by the proposed NSR major modification; and
(ii) for PM-10 and PM-2.5, the net impact in no case exceeds an applicable significant impact level set forth in section 231-12.6 of this Part.
(3) Interstate offsets. An emission offset of PM-10, or PM-2.5 (including applicable precursors), may be obtained from areas of equal or higher classification located in another state, in accordance with department approved modeling procedures, provided that an interstate reciprocal trading agreement is in place and the requirements of paragraphs (1) and (2) of this subdivision are met.
(e) 'Ozone nonattainment and emission offset location'. Department approved modeling procedures must be used by an applicant to find default acceptable VOC or NOx offset source locations within New York State or to perform a case specific contribution demonstration. An emission offset of VOC or NOx is subject to the following:
(1) Proposed NSR major modification located in an ozone nonattainment area.
(i) Intrastate offset sources. An emission offset of VOC or NOx be obtained from:
('a') the same ozone nonattainment area; or
('b') other ozone nonattainment areas of equal or higher classification, if emissions from such other areas contribute to a violation of the NAAQS for ozone in the nonattainment area where the proposed NSR major modification is to be located.
(ii) Interstate offset sources. An emission offset may be obtained from ozone nonattainment areas of equal or higher classification in another state, if emissions from such other areas contribute to a violation of the NAAQS for ozone in the nonattainment area where the proposed NSR major modification is to be located and an interstate reciprocal trading agreement is in place. Department approved modeling procedures may be used by an applicant to perform a case specific contribution demonstration.
(2) Proposed NSR major modification located in an attainment area of the state within the ozone transport region. An emission offset of VOC or NOx may be obtained from any location within the ozone transport region in New York State. Such an offset may also be obtained from another state in the ozone transport region, provided that an interstate reciprocal trading agreement is in place.

N.Y. Comp. Codes R. & Regs. Tit. 6 §§ 231-6.6

Amended New York State Register February 10, 2021/Volume XLIII, Issue 06, eff. 2/25/2021