Class I area definition

Class I area means a mandatory visibility protection area designated pursuant to section 169A of the federal Clean Air Act.

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Class I area means any prevention of significant deterioration area (i) in which virtually any deterioration of existing air quality is considered significant and (ii) designated as such in 9VAC5-20-205.

Class I area means any area designated pursuant to Sections 162 or 164 of the Federal Clean Air Act as a Class I area. The following areas are the Class I areas located within Washington state:

Examples of Class I area in a sentence

The fifth of five factors that must be considered for a BART determination analysis, as required by a 40 CFR part 51-Appendix Y, is the degree of Class I area visibility improvement that would result from the installation of the various options for control technology.
Method 6 requires input of monthly relative humidity factors [f(RH)] for each Class I area that is being modeled.
Latitude and longitude coordinates for Class I area discrete receptors were taken from the National Park Service (NPS) Class I Receptors database and converted to the appropriate LCC coordinates.
This factor was evaluated for the Sooner Generating Station by using an EPA-approved dispersion modeling system (CALPUFF) to predict the change in Class I area visibility.
OG&E Muskogee Generating Station BART Review January 15, 2010 DEQ has determined that an individual source will be considered to "contribute to visibility impairment" if emissions from the source result in a change in visibility, measured as a change in deciviews (∆-dv), that is greater than or equal to 0.5 dv in a Class I area.

More Definitions of Class I area

Class I area or “PSD Class I area” means any Federal, State or Indian reservation land which is classified or reclassified as a Class I area under OAR 340-204-0050 and 340-204-0060.

Class I area means any area designated under section 162 or 164 of the Federal Clean Air Act as a Class I area. The following areas are the Class I areas in Washington state:

Class I area means any area designated under section 162 or 164 of the federal Clean Air Act (42 U.S.C., Sec. 7472 or 7474) as a Class I area. The following areas are the Class I areas in Washing- ton state:

Class I area means any area listed as Class I in 40 CFR Part 81 Subpart D, including Section 81.405, or an area otherwise specified as Class I in the legislation that creates a national monument, a national primitive area, a national preserve, a national recreational area, a national wild and scenic river, a national wildlife refuge,or a national lakeshore or seashore.

Class I area means any area designated as Class I under Title I, Part C of the federal Clean Air Act. As of April 27, 2016, the Agua Tibia National Wilderness Area was the only area so designated within San Diego County. As of April 27, 2016, the following were the only designated Class I areas within 100 km of San Diego County (see Table 20.1-3):

Class I area or "PSD Class I area" means any Federal, State, or Indian reservation land which is classified or reclassified as a Class I area under LRAPA title 29.

Class I area means any one of the Arizona mandatory federal Class I areas defined in A.R.S. § 49-401.01.