Nevada Administrative Code (Last Updated: January 6, 2015)

NAC445B.121. “Opacity” defined.

Latest version.

“Opacity” means the property of a substance tending to obscure vision and measured in terms of percent obscuration. The relationship between opacity and Ringelmann number is approximately equal to the following in shades of white to gray.

Opacity	Ringelmann
(Percent)	Number

20...................................	1
40.................................	2
60.................................	3
80.................................	4
100.................................	5

[Environmental Comm’n, Air Quality Reg. § 1.44, eff. 11-7-75; renumbered as § 1.120, 12-4-76]—(Substituted in revision for NAC 445.557)

                    
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