OAR 340-223-0020

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


“BART-eligible source” means any source determined by the Department to meet the criteria for a BART-eligible source established in Appendix Y to 40 CFR Part 51, “Guidelines for BART Determinations Under the Regional Haze Rule”, and in accordance with the federal Regional Haze Rules under 40 CFR § 51.308(e), as in effect on December 9, 2010.


“Best Available Retrofit Technology (BART)” means an emission limitation based on the degree of reduction achievable through the application of the best system of continuous emission reduction for each pollutant that is emitted by an existing stationary facility. The emission limitation must be established, on a case-by-case basis, taking into consideration the technology available, the costs of compliance, the energy and nonair quality environmental impacts of compliance, any pollution control equipment in use or in existence at the source or unit, the remaining useful life of the source or unit, and the degree of improvement in visibility which may reasonably be anticipated to result from the use of such technology.


“Deciview” means a measurement of visibility impairment. A deciview is a haze index derived from calculated light extinction, such that uniform changes in haziness correspond to uniform incremental changes in perception across the entire range of conditions, from pristine to highly impaired. The deciview haze index is calculated based on the following equation (for the purposes of calculating deciview, the atmospheric light extinction coefficient must be calculated from aerosol measurements):
Deciview haze index=10ln(bext/10 Mm-1)
Where bext= the atmospheric light extinction coefficient, expressed in inverse megameters (Mm-1).


“Dry sorbent injection pollution control system” means a pollution control system that reduces sulfur dioxide emissions by combining a dry alkaline reagent directly with the boiler exhaust gas stream to enable the reagent to adsorb sulfur dioxide and be collected by the existing electrostatic precipitator.


“Subject to BART” means a BART-eligible source that based on air quality dispersion modeling causes visibility impairment equal to or greater than 0.5 deciview in any Class I area, at the 98th percentile for both a three-year period and one-year period.


“Ultra-low sulfur coal” means coal that contains no more than 0.25 lb sulfur/mmBtu heat input on average.
[NOTE: View a PDF of Appendix Y to 40 C.F.R. Part 51 by clicking on “Tables” link below.]
[ED. NOTE: To view attachments referenced in rule text, click here to view rule.]
Last Updated

Jun. 8, 2021

Rule 340-223-0020’s source at or​.us