Oregon Administrative Code

340-200-0010 Purpose and Application (1) This division provides general air pollution procedures and definitions that apply to all air quality rules in OAR 340 divisions 200 through 268. (2) Divisions 200 through 268 apply in addition to all other rules adopted by the EQC. In cas…

340-200-0020 General Air Quality Definitions As used in OAR chapter 340, divisions 200 through 268, unless specifically defined otherwise: (1) "Act" or "FCAA" means the Federal Clean Air Act, 42 U.S.C.A. § 7401 to 7671q. (2) "Activity" means any process, operation, action, or rea…

340-200-0025 Abbreviations and Acronyms (1) “AAQS” means ambient air quality standard. (2) "ACDP" means Air Contaminant Discharge Permit. (3) "ACT" means Federal Clean Air Act. (4) "AE" means Actual Emissions. (5) "AICPA" means Association of Independent Certified Public Accounta…

340-200-0030 Exceptions (1) Except as provided in section (2), OAR chapter 340 divisions 200 through 268 do not apply to: (a) Agricultural operations, including but not limited to: (A) Growing or harvesting crops; (B) Raising fowl or animals; (C) Clearing or grading agricultural …

340-200-0035 Reference Materials As used in divisions 200 through 268, the following materials refer to the versions listed below. (1) "C.F.R." or “CFR” means Code of Federal Regulations and, unless otherwise expressly identified, refers to the July 1, 2025, edition. (2) The DEQ …

340-200-0040 State of Oregon Clean Air Act Implementation Plan (1) This implementation plan, consisting of Volumes 2 and 3 of the State of Oregon Air Quality Control Program, contains control strategies, rules and standards prepared by DEQ and is adopted as the State Implementati…

340-200-0050 Compliance Schedules (1) DEQ's goal is to encourage voluntary cooperation of all persons responsible for an air contamination source. To facilitate this cooperation and provide for a progressive program of air pollution control, DEQ may negotiate with such persons to…

340-200-0100 Conflicts of Interest: Purpose The purpose of OAR 340-200-0100 through 340-200-0120 is to comply with the requirements of Section 128 of the FCAA regarding public interest representation by a majority of the members of the EQC and by the Director and disclosure by th…

340-200-0110 Conflicts of Interest: Public Interest Representation At least a majority of the members of the EQC and the Director must represent the public interest and may not derive any significant portion of their respective incomes directly from persons subject in Oregon to p…

340-200-0120 Conflicts of Interest: Disclosure of Potential Conflicts of Interest Each member of the EQC and the Director must disclose any potential conflict of interest. NOTE: This rule is included in the State of Oregon Clean Air Act Implementation Plan that EQC adopted under …

340-202-0010 Definitions The definitions in OAR 340-200-0020, 340-204-0010 and this rule apply to this division. If the same term is defined in this rule and 340-200-0020 or 340-204-0010, the definition in this rule applies to this division. (1) "Approved method" means an analyti…

340-202-0020 Applicability and Jurisdiction Subject to the requirements in this division and OAR 340-200-0010(3), LRAPA is designated by the EQC to implement the rules in this division within its area of jurisdiction. Statutory/Other Authority: ORS 468.020, 468A.025 & 468A.035 St…

340-202-0050 Ambient Air Quality Standards: 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 mu…

340-202-0060 Ambient Air Quality Standards: 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) 150 micrograms …

340-202-0070 Ambient Air Quality Standards: Sulfur Dioxide Concentrations of sulfur dioxide in ambient air as measured by an approved method for each averaging time must not exceed the following concentrations: (1) Annual average: 10 ppb as a three-year average of annual arithmet…

340-202-0080 Ambient Air Quality Standards: 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 …

340-202-0090 Ambient Air Quality Standards: Ozone Concentrations of ozone in ambient air as measured by an approved method must not exceed 0.070 ppm as a daily maximum eight-hour average concentration. This standard is attained when, at any site the average of the annual fourth-h…

340-202-0100 Ambient Air Quality Standards: Nitrogen Dioxide Concentrations of nitrogen dioxide in ambient air as measured by a reference method based on appendix F to 40 CFR part 50 or by a Federal equivalent method (FEM) designated in accordance with 40 CFR part 53 must not exc…

340-202-0110 Ambient Air Quality Standards: Particle Fallout The particle fallout rate as measured by an Oregon standard method at a location approved by DEQ must not exceed: (1) 10 grams per square meter per month in an industrial area. (2) 5.0 grams per square meter per month i…

340-202-0130 Ambient Air Quality Standards: Lead The concentration of lead and its compounds in ambient air must not exceed: (1) 0.15 micrograms per cubic meter as a maximum arithmetic mean averaged over a calendar quarter, as measured by a reference method based on appendix G of…

340-202-0200 Prevention of Significant Deterioration Increments: 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 FCAA Amendments of 1977. (2) D…

340-202-0210 Prevention of Significant Deterioration Increments: Ambient Air PSD 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 aggregate increases in regulate…

340-202-0220 Prevention of Significant Deterioration Increments: Ambient Air Ceilings No concentration of a pollutant may exceed: (1) The concentration permitted under the national secondary ambient air quality standard; (2) The concentration permitted under the national primary …

340-202-0225 Prevention of Significant Deterioration Increments: Ambient Air Quality Impact Levels for Maintenance Areas The following ambient air quality impact levels apply to the areas specified for the purpose of the air quality analysis in OAR 340-224-0060 and 340-224-0260, …

340-204-0010 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 340-200-0020, the definition in this rule applies to this division. Definitions of boundaries in this rule also apply to OAR 340 divisio…

340-204-0020 Designation of Air Quality Control Regions Oregon's thirty-six counties are divided into five AQCRs. The AQCR boundaries follow county lines, and there are no counties that belong to more than one AQCR. The five AQCRs are as follows: (1) Portland Interstate AQCR, con…

340-204-0030 Designation of Nonattainment Areas There are not currently any areas designated as Nonattainment Areas in the State of Oregon. [NOTE: This rule is included in the State of Oregon Clean Air Act Implementation Plan that EQC adopted under OAR 340-200-0040.] Statutory/Ot…

340-204-0040 Designation of Maintenance Areas The following areas are designated as Maintenance Areas: (1) Carbon Monoxide Maintenance Areas: (a) The Eugene Maintenance Area for carbon monoxide is the Eugene-Springfield AQMA as defined in OAR 340-204-0010; (b) The Portland Mainte…

340-204-0050 Designation of Prevention of Significant Deterioration Areas (1) All of the following areas which were in existence on August 7, 1977, and for which the 1990 Clean Air Act Amendments clarified, shall be Class I Areas and may not be redesignated: (a) Mt. Hood Wilderne…

340-204-0060 Redesignation of Prevention of Significant Deterioration Areas (1)(a) All areas in Oregon, except as otherwise provided under OAR 340-204-0050, are designated Class II as of December 5, 1974; (b) Redesignation, except as otherwise precluded by OAR 340-204-0050, may b…

340-204-0070 Special Control Areas The following areas are designated as Special Control Areas: (1) The counties within the Willamette Valley, including Benton, Clackamas, Columbia, Lane, Linn, Marion, Multnomah, Polk, Washington and Yamhill Counties; (2) Umpqua Basin; (3) Rogue …

340-204-0080 Motor Vehicle Inspection Boundary Designations In addition to the area specified in ORS 815.300, pursuant to 468A.390, the following geographical areas are designated as areas within which motor vehicles are subject to the requirement under 815.300 to have a Certific…

340-204-0090 Oxygenated Gasoline Control Areas The EQC may adopt or amend a CO maintenance plan that includes contingency plan provisions that require use of oxygenated fuel. NOTE: This rule is included in the State of Oregon Clean Air Act Implementation Plan that EQC adopted und…

340-204-0300 Designation of Sustainment Areas (1) The EQC may designate sustainment areas provided that DEQ submits a request for designation that includes the following information: (a) Monitoring data showing that an area is exceeding or has the potential to exceed an ambient a…

340-204-0310 Designation of Reattainment Areas (1) The EQC may designate reattainment areas provided that DEQ submits a request for designation that includes the following information: (a) At least three consecutive years of monitoring data showing that an area that is currently …

340-204-0320 Priority Sources For the purposes of division 224, priority sources are identified as follows: (1) In the Lakeview sustainment area, uncertified residential wood fuel-fired devices. The offset values for replacement of uncertified residential wood fuel-fired devices …

340-206-0010 Introduction OAR 340-206-0030, 340-206-0050 and 340-206-0060 are effective within priority I and II air quality control regions (AQCR) as defined in 40 CFR part 51, subpart H (1995), when the AQCR contains an AQMA as defined in OAR 340-204-0010, or a nonattainment ar…

340-206-0020 Definitions The definitions in OAR 340-200-0020, 340-204-0010 and this rule apply to this division. If the same term is defined in this rule and 340-200-0020 or 340-204-0010, the definition in this rule applies to this division. NOTE: This rule is included in the Sta…

340-206-0030 Episode Stage Criteria for Air Pollution Emergencies Three stages of air pollution episode conditions and a pre-episode standby condition are established to inform the public of the general air pollution status and provide a management structure to require preplanned…

340-206-0040 Special Conditions (1) DEQ must issue an "ozone advisory" to the public when monitored ozone values at any site exceed the ambient air quality standard of 0.12 ppm but are less than 0.2 ppm for a one hour average. The ozone advisory must clearly identify the area whe…

340-206-0050 Source Emission Reduction Plans (1) OAR 340-206-8010 through 340-206-8030 set forth specific emission reduction measures which must be taken upon the declaration of an air pollution alert, air pollution warning, or air pollution emergency. Any person responsible for …

340-206-0060 Regional Air Pollution Authorities (1) DEQ and LRAPA must cooperate to the fullest extent possible to insure uniformity of enforcement and administrative action necessary to implement this division. With the exception of sources of air contamination where jurisdictio…

340-206-0070 Operations Manual The DEQ must maintain an operations manual to administer the provisions of this division. This manual must be available to the Department Emergency Action office at all times. At a minimum the operations manual must contain the following elements: (…

340-206-8010 Air Pollution Episode ALERT Conditions Source Emission Reduction Plan Emission Control Actions to be Taken as Appropriate in Alert Episode Area View a PDF of actions by clicking on "Tables" link below. [ED. NOTE: To view attachments referenced in rule text, click her…

340-206-8020 Air Pollution Episode WARNING Conditions Emission Reduction Plan [Note: View a PDF of plan details by clicking on "Tables" link below.] [ED. NOTE: To view attachments referenced in rule text, click here for PDF copy.] Statutory/Other Authority: ORS 468.020 & 468A Sta…

340-206-8030 Air Pollution Episode EMERGENCY Conditions Emission Reduction Plan Pollution Episode Conditions for all Pollutants (Except Particulate from Volcanic Activity or Windblown Dust.) [Note: View a PDF of plan details by clicking on the "Tables" link below.] [ED. NOTE: To …

340-206-8040 Air pollution episode conditions due to Particulate which is primarily fallout from volcanic activity or windblown dust. Ambient Particulate control measures to be taken as appropriate in episode area. [Note: View a PDF of control measures by clicking on the "Tables"…

340-208-0005 Applicability and Jurisdiction (1) This division applies in all areas of the state; except rules OAR 340-208-0500 through 340-208-0610, which apply in all areas of Clackamas, Columbia, Multnomah and Washington counties. (2) Subject to the requirements in this divisio…

340-208-0010 Definitions The definitions in OAR 340-200-0020, 340-204-0010 and this rule apply to this division. If the same term is defined in this rule and 340-200-0020 or 340-204-0010, the definition in this rule applies to this division. (1) "Abate" means to eliminate the nui…

340-208-0110 Visible Air Contaminant Limitations (1) The emissions standards in this rule do not apply to: (a) Fugitive emissions from a source or part of a source; or (b) Recovery furnaces regulated under OAR chapter 340, division 234. (2) The visible emissions standards in this…