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State
Oregon Regulations
CHAP 340 DIVISION 202 AMBIENT AIR QUALITY STANDARDS AND PSD INCREMENTS




The Oregon Administrative Rules contain OARs filed through July 14, 2006

DEPARTMENT OF ENVIRONMENTAL QUALITY

DIVISION 202

AMBIENT AIR QUALITY STANDARDS AND PSD
INCREMENTS



[NOTE: Administrative Order DEQ 37 repealed previous OAR 340-031-0005 through 340-031-0020 (DEQ 5 and 6).]

340-202-0010

Definitions

The definitions in OAR 340-200-0020 and this rule apply to this division. If the same term is defined in this rule and OAR 340-200-0020, the definition in this rule applies to this division.

(1) "Ambient Air" means that portion of the atmosphere external to buildings, to which the general public has access.

(2) "Ambient Air Monitoring Site Criteria" means the general probe siting specifications as set forth in Appendix E of 40 CFR 58.

(3) "Approved Method" means an analytical method for measuring air contaminant concentrations described or referenced in 40 CFR 50 and Appendices. These methods are approved by the Department of Environmental Quality.

(4) "Baseline Concentration" means:

(a) Except as provided in subsection (c), the ambient concentration level for sulfur dioxide and PM10 that existed in an area during the calendar year 1978. If no ambient air quality data is available in an area, the baseline concentration may be estimated using modeling based on actual emissions for 1978. Actual emission increases or decreases occurring before January 1, 1978 must be included in the baseline calculation, except that actual emission increases from any major source or major modification on which construction commenced after January 6, 1975 must not be included in the baseline calculation;

(b) The ambient concentration level for nitrogen oxides that existed in an area during the calendar year 1988.

(c) For the area of northeastern Oregon within the boundaries of the Umatilla, Wallowa-Whitman, Ochoco, and Malheur National Forests, the ambient concentration level for PM10 that existed during the calendar year 1993. The Department allows the use of a prior time period if the Department determines that it is more representative of normal emissions.

(5) "Indian Governing Body" means the governing body of any tribe, band, or group of Indians subject to the jurisdiction of the United States and recognized by the United States as possessing power of self-government.

(6) "Indian Reservation" means any federally recognized reservation established by Treaty, Agreement, Executive Order, or Act of Congress.

(7) "Oregon Standard Method" means any method of sampling and analyzing for an air contaminant approved by the Department. Oregon standard methods are kept on file by the Department.

(8) "PPM" means parts per million by volume. It is a dimensionless unit of measurement for gases that expresses the ratio of the volume of one component gas to the volume of the entire sample mixture of gases.

[NOTE: This rule is included in the State of Oregon Clean Air Act Implementation Plan as adopted by the Environmental Quality Commission under OAR 340-200-0040.]

[Publications: The publications referenced in this rule are available from the agency.]

Stat. Auth.: ORS 468A
Stats. Implemented: ORS 468A.025
Hist.: DEQ 37, f. 2-15-72, ef. 3-1-72; DEQ 18-1979, f. & ef. 6-22-79; DEQ 25-1981, f. & ef. 9-8-81; DEQ 8-1988, f. & cert. ef. 5-19-88 (corrected 9-30-88); DEQ 4-1993, f. & cert. ef. 3-10-93; DEQ 19-1993, f. & cert. ef. 11-4-93; Renumbered from 340-031-0105; DEQ 17-1995, f. & cert. ef. 7-12-95; DEQ 14-1999, f. & cert. ef. 10-14-99, Renumbered from 340-031-0005; DEQ 6-2001, f. 6-18-01, cert. ef. 7-1-01

Ambient Air Quality Standards
340-202-0050

Purpose and Scope of Ambient Air Quality Standards

(1) An ambient air quality standard is an established concentration, exposure time, and frequency of occurrence of an air contaminant or multiple contaminants in the ambient air that must not be exceeded. The ambient air quality standards set forth in OAR 340-202-0050 through 340-202-0130 were established to protect both public health and public welfare.

(2) Ambient air quality standards are not generally used to determine the acceptability or unacceptability of emissions from a specific source of air contamination. More commonly, the measured ambient air quality is compared with the ambient air quality standards to determine the adequacy or effectiveness of emission standards for all sources in a general area. However, if a source or combination of sources are singularly responsible for a violation of ambient air quality standards in a particular area, it may be appropriate to impose emission standards that are more stringent than those otherwise applied to the class of sources involved. Similarly, proposed construction of new sources or expansions of existing sources, that may prevent or interfere with the attainment and maintenance of ambient air quality standards are grounds for issuing an order prohibiting such proposed construction as authorized by ORS 468A.055 and pursuant to OAR 340-210-0200 through 340-210-0220, and OAR 340-218-0190.

(3) In adopting the ambient air quality standards in this division, the Environmental Quality Commission recognizes that one or more of the standards are currently being exceeded in certain parts of the state. It is hereby declared to be the policy of the Environmental Quality Commission to achieve, by application of a timely but orderly program of pollution abatement, full compliance with ambient air quality standards throughout the state at the earliest possible date.

[NOTE: This rule is included in the State of Oregon Clean Air Act Implementation Plan as adopted by the Environmental Quality Commission under OAR 340-200-0040.]

Stat. Auth.: ORS 468 & ORS 468A
Stats. Implemented: ORS 468A.025
Hist.: DEQ 37, f. 2-15-72, ef. 3-1-72; DEQ 4-1993, f. & cert. ef. 3-10-93; DEQ 14-1999, f. & cert. ef. 10-14-99, Renumbered from 340-031-0010; DEQ 6-2001, f. 6-18-01, cert. ef. 7-1-01

340-202-0060

Suspended Particulate Matter

Concentrations of the fraction of suspended particulate that is equal to or less than ten microns in aerodynamic diameter in ambient air as measured by an approved method must not exceed:

(1) 50 micrograms of PM10 per cubic meter of air as an annual arithmetic mean. This standard is attained when the expected annual arithmetic mean concentration, as determined in accordance with Appendix K of 40 CFR 50 is less than or equal to 50 micrograms per cubic meter at any site.

(2) 150 micrograms of PM10 per cubic meter of air as a 24-hour average concentration for any calendar day. This standard is attained when the expected number of days per calendar year with a 24-hour average concentration above 150 micrograms per cubic meter as determined in accordance with Appendix K of 40 CFR 50 is equal to or less than one at any site.

[NOTE: This rule is included in the State of Oregon Clean Air Act Implementation Plan as adopted by the Environmental Quality Commission under OAR 340-200-0040.]

[Publications: The publication(s) referenced in this rule is available from the agency.]

Stat. Auth.: ORS 468 & ORS 468A
Stats. Implemented: ORS 468A.025
Hist.: DEQ 37, f. 2-15-72, ef. 3-1-72; DEQ 8-1988, f. & cert. ef. 5-19-88 (corrected 9-30-88); DEQ 24-1991, f. & cert. ef. 11-13-91; DEQ 4-1993, f. & cert. ef. 3-10-93; DEQ 14-1999, f. & cert. ef. 10-14-99, Renumbered from 340-031-0015; DEQ 6-2001, f. 6-18-01, cert. ef. 7-1-01

340-202-0070

Sulfur Dioxide

Concentrations of sulfur dioxide in ambient air as measured by an approved method must not exceed:

(1) 0.02 ppm as an annual arithmetic mean for any calendar year at any site.

(2) 0.10 ppm as a 24-hour average concentration more than once per year at any site.

(3) 0.50 ppm as a three-hour average concentration more than once per year at any site.

[NOTE: This rule is included in the State of Oregon Clean Air Act Implementation Plan as adopted by the Environmental Quality Commission under OAR 340-200-0040.]

Stat. Auth.: ORS 468 & ORS 468A
Stats. Implemented: ORS 468A.025
Hist.: DEQ 37, f. 2-15-72, ef. 3-1-72; DEQ 8-1988, f. & cert. ef. 5-19-88 (corrected 9-30-88); DEQ 24-1991, f. & cert. ef. 11-13-91; DEQ 4-1993, f. & cert. ef. 3-10-93; DEQ 14-1999, f. & cert. ef. 10-14-99, Renumbered from 340-031-0020; DEQ 6-2001, f. 6-18-01, cert. ef. 7-1-01

340-202-0080

Carbon Monoxide

For comparison to the standard, averaged ambient concentrations of carbon monoxide must be rounded to the nearest integer in parts per million (ppm). Fractional parts of 0.5 or greater must be rounded up. Concentrations of carbon monoxide in ambient air as measured by an approved method, must not exceed:

(1) 9 ppm as an eight-hour average concentration more than once per year at any site.

(2) 35 ppm as a one-hour average concentration more than once per year at any site.

[NOTE: This rule is included in the State of Oregon Clean Air Act Implementation Plan as adopted by the Environmental Quality Commission under OAR 340-200-0040.]

Stat. Auth.: ORS 468 & ORS 468A
Stats. Implemented: ORS 468A.025
Hist.: DEQ 37, f. 2-15-72, ef. 3-1-72; DEQ 8-1988, f. & cert. ef. 5-19-88 (corrected 9-30-88); DEQ 24-1991, f. & cert. ef. 11-13-91; DEQ 4-1993, f. & cert. ef. 3-10-93; DEQ 14-1999, f. & cert. ef. 10-14-99, Renumbered from 340-031-0025; DEQ 6-2001, f. 6-18-01, cert. ef. 7-1-01

340-202-0090

Ozone

Concentrations of ozone in ambient air as measured by an approved method must not exceed 0.12 ppm as a one-hour average concentration. This standard is attained when, at any site the expected number of days per calendar year with maximum hourly concentrations greater than 0.12 ppm is equal to or less than one as determined by the method of Appendix H, 40 CFR 50.

[NOTE: This rule is included in the State of Oregon Clean Air Act Implementation Plan as adopted by the Environmental Quality Commission under OAR 340-200-0040.]

[Publications: The publication(s) referenced in this rule is available from the agency.]

Stat. Auth.: ORS 468 & ORS 468A
Stats. Implemented: ORS 468A.025
Hist.: DEQ 37, f. 2-15-72, ef. 3-1-72; DEQ 15-1979, f. & ef. 6-22-79; DEQ 7-1980, f. & ef. 3-5-80; DEQ 4-1982, f. & ef. 1-29-82; DEQ 8-1988, f. & cert. ef. 5-19-88 (corrected 9-30-88); DEQ 24-1991, f. & cert. ef. 11-13-91; DEQ 4-1993, f. & cert. ef. 3-10-93; DEQ 14-1999, f. & cert. ef. 10-14-99, Renumbered from 340-031-0030; DEQ 6-2001, f. 6-18-01, cert. ef. 7-1-01

340-202-0100

Nitrogen Dioxide

Concentrations of nitrogen dioxide in ambient air as measured by an approved method must not exceed 0.053 ppm as an annual arithmetic mean at any site.

[NOTE: This rule is included in the State of Oregon Clean Air Act Implementation Plan as adopted by the Environmental Quality Commission under OAR 340-200-0040.]

Stat. Auth.: ORS 468 & ORS 468A
Stats. Implemented: ORS 468A.025
Hist.: DEQ 37, f. 2-15-72, ef. 3-1-72; DEQ 8-1988, f. & cert. ef. 5-19-88 (corrected 9-30-88); DEQ 24-1991, f. & cert. ef. 11-13-91; DEQ 4-1993, f. & cert. ef. 3-10-93; DEQ 14-1999, f. & cert. ef. 10-14-99, Renumbered from 340-031-0040; DEQ 6-2001, f. 6-18-01, cert. ef. 7-1-01

340-202-0110

Particle Fallout

The particle fallout rate as measured by an Oregon standard method at a location approved by the Department of Environmental Quality must not exceed:

(1) 10 grams per square meter per month in an industrial area.

(2) 5.0 grams per square meter per month in an industrial area if visual observations show a presence of wood waste or soot and the volatile fraction of the sample exceeds 70 percent.

(3) 5.0 grams per square meter per month in residential and commercial areas.

(4) 3.5 grams per square meter per month in residential and commercial areas if visual observations show the presence of wood waste or soot and the volatile fraction of the sample exceeds 70 percent.

Stat. Auth.: ORS 468 & ORS 468A
Stats. Implemented: ORS 468A.025
Hist.: DEQ 37, f. 2-15-72, ef. 3-1-72; DEQ 8-1988, f. & cert. ef. 5-19-88 (corrected 9-30-88); DEQ 14-1999, f. & cert. ef. 10-14-99, Renumbered from 340-031-0045; DEQ 6-2001, f. 6-18-01, cert. ef. 7-1-01

340-202-0130

Ambient Air Quality Standard for Lead

The lead concentration in ambient air as measured by an approved method must not exceed 1.5 micrograms per cubic meter as an arithmetic average concentration of all samples collected at any site during any one calendar quarter.

[NOTE: This rule is included in the State of Oregon Clean Air Act Implementation Plan as adopted by the Environmental Quality Commission under OAR 340-200-0040.]

Stat. Auth.: ORS 468 & ORS 468A
Stats. Implemented: ORS 468A.025
Hist.: DEQ 85, f. 1-29-75, ef. 2-25-75; DEQ 1-1983, f. & ef. 1-21-83; DEQ 8-1988, f. & cert. ef. 5-19-88 (corrected 9-30-88); DEQ 24-1991, f. & cert. ef. 11-13-91; DEQ 4-1993, f. & cert. ef. 3-10-93; DEQ 14-1999, f. & cert. ef. 10-14-99, Renumbered from 340-031-0055; DEQ 6-2001, f. 6-18-01, cert. ef. 7-1-01

Prevention of Significant Deterioration Increments
340-202-0200

General

(1) The purpose of OAR 340-202-0200 through 340-202-0220 is to implement a program to prevent significant deterioration of air quality in the State of Oregon as required by the federal Clean Air Act Amendments of 1977.

(2) The Department will review the adequacy of the State Implementation Plan on a periodic basis and within 60 days of such time as information becomes available that an applicable increment is being violated. Any Plan revision resulting from the reviews will be subject to the opportunity for public hearing in accordance with procedures established in the Plan.

[NOTE: This rule is included in the State of Oregon Clean Air Act Implementation Plan as adopted by the Environmental Quality Commission under OAR 340-200-0040.]

Stat. Auth.: ORS 468 & ORS 468A
Stats. Implemented: ORS 468A.025
Hist.: DEQ 18-1979, f. & ef. 6-22-79; DEQ 4-1993, f. & cert. ef. 3-10-93; DEQ 14-1999, f. & cert. ef. 10-14-99, Renumbered from 340-031-0100.

340-202-0210

Ambient Air Increments

(1) This rule defines significant deterioration. In areas designated as Class I, II or III, emissions from new or modified sources must be limited such that increases in pollutant concentration over the baseline concentration must be limited to those set out in Table 1.

(2) For any period other than an annual period, the applicable maximum allowable increase may be exceeded during one such period per year at any one location.

[NOTE: This rule is included in the State of Oregon Clean Air Act Implementation Plan as adopted by the Environmental Quality Commission under OAR 340-200-0040.]

[ED. NOTE: The Table referenced in this rule is not printed in the OAR Compilation. Copies are available from the agency.]

Stat. Auth.: ORS 468 & ORS 468A
Stats. Implemented: ORS 468A.025
Hist.: DEQ 18-1979, f. & ef. 6-22-79; DEQ 8-1988, f. & cert. ef. 5-19-88 (corrected 9-30-88); DEQ 7-1992, f. & cert. ef. 3-30-92; DEQ 17-1995, f. & cert. ef. 7-12-95; DEQ 14-1999, f. & cert. ef. 10-14-99, Renumbered from 340-031-0110; DEQ 6-2001, f. 6-18-01, cert. ef. 7-1-01

340-202-0220

Ambient Air Ceilings

No concentration of a pollutant may exceed:

(1) The concentration permitted under the national secondary ambient air quality standard; or

(2) The concentration permitted under the national primary ambient air quality standard; or

(3) The concentration permitted under the state ambient air quality standard, whichever concentration is lowest for the pollutant for a period of exposure.

[NOTE: This rule is included in the State of Oregon Clean Air Act Implementation Plan as adopted by the Environmental Quality Commission under OAR 340-200-0040.]

Stat. Auth.: ORS 468 & ORS 468A
Stats. Implemented: ORS 468A.025
Hist.: DEQ 18-1979, f. & ef. 6-22-79; DEQ 14-1999, f. & cert. ef. 10-14-99, Renumbered from 340-031-0115; DEQ 6-2001, f. 6-18-01, cert. ef. 7-1-01


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