HOME    SEARCH    ABOUT US    CONTACT US    HELP   
           
Rule: 17.8.221 Prev     Up     Next    
Rule Title: AMBIENT AIR QUALITY STANDARD FOR VISIBILITY
Add to My Favorites
Add to Favorites
Department: ENVIRONMENTAL QUALITY, DEPARTMENT OF
Chapter: AIR QUALITY
Subchapter: Ambient Air Quality
 
Latest version of the adopted rule presented in Administrative Rules of Montana (ARM):

Printer Friendly Version

17.8.221    AMBIENT AIR QUALITY STANDARD FOR VISIBILITY

(1) No person shall cause or contribute to concentrations of particulate matter such that the scattering coefficient of particulate matter in the ambient air exceeds the following standard:

(a) annual average: 3 x 10-5 per meter, annual average, not to be exceeded.

(2) The provisions of (1) are applicable only in Class I areas as are designated under the Montana Clean Air Act rules, Prevention of Significant Deterioration of Air Quality, (ARM Title 17, chapter 8, subchapter 8) on the effective date of this rule. Areas redesignated Class I subsequent to the effective date of this rule shall be subject to the provisions of (1) only upon a finding by the board that visibility is an important attribute of such area.

(3) Measurement method: For determining compliance with this rule, visibility shall be measured by the integrating nephelometer method, as more fully described in "Methods of Air Sampling and Analysis, Second Edition" (1977) Method No. 11203-03-76 T, as modified by the addition of a heated sample inlet line and green spectral sensitivity; or by an approved equivalent method.

History: 75-2-111, 75-2-202, MCA; IMP, 75-2-202, MCA; NEW, 1980 MAR p. 2399, Eff. 8/15/80; TRANS, from DHES, 1996 MAR p. 2285.


 

 
MAR Notices Effective From Effective To History Notes
8/15/1980 Current History: 75-2-111, 75-2-202, MCA; IMP, 75-2-202, MCA; NEW, 1980 MAR p. 2399, Eff. 8/15/80; TRANS, from DHES, 1996 MAR p. 2285.
Home  |   Search  |   About Us  |   Contact Us  |   Help  |   Disclaimer  |   Privacy & Security