[Code of Federal Regulations]
[Title 40, Volume 17]
[Revised as of July 1, 2007]
From the U.S. Government Printing Office via GPO Access
[CITE: 40CFR81.51]

[Page 19]
 
                   TITLE 40--PROTECTION OF ENVIRONMENT
 
         CHAPTER I--ENVIRONMENTAL PROTECTION AGENCY (CONTINUED)
 
PART 81_DESIGNATION OF AREAS FOR AIR QUALITY PLANNING PURPOSES--Table of 
 
          Subpart B_Designation of Air Quality Control Regions
 
Sec.  81.51  Portland Interstate Air Quality Control Region.

    The Portland Interstate Air Quality Control Region (Oregon-
Washington) has been revised to consist of the territorial area 
encompassed by the boundaries of the following jurisdictions or 
described area (including the territorial area of all municipalities (as 
defined in section 302(f) of the Clean Air Act, 42 U.S.C. 1857h(f)) 
geographically located within the outermost boundaries of the area so 
delimited):

    In the State of Oregon: Benton County, Clackamas County, Columbia 
County, Lane County, Linn County, Marion County, Multnomah County, Polk 
County, Washington County, Yamhill County.
    In the State of Washington: Clark County, Cowlitz County, Lewis 
County, Skamania County, Wahkiakum County.

    Note: For purposes of identification, the Portland Interstate Air 
Quality Control Region (Oregon-Washington) will be referred to by 
Washington authorities as the Portland (Oregon)-Southwest Washington 
Interstate Air Quality Control Region.