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Virginia Administrative Code
Title 9. Environment
Agency 5. State Air Pollution Control Board
Chapter 60. Hazardous Air Pollutant Sources
12/30/2024

9VAC5-60-250. Determination of ambient air concentrations.

A. The owner shall, upon the request of the board, provide an assessment as to whether his facility emits, or may emit, any toxic pollutant in such quantities as to cause, or contribute to, any concentration exceeding, or which may exceed, any significant ambient air concentration.

B. Ambient air concentrations shall be determined using air quality analysis techniques (modeling) based on emission rates equal to the potential to emit of the stationary source for the applicable averaging time or any other method acceptable to the board.

C. Ambient air concentrations shall include all emissions from the stationary source, including those from sources exempted under 9VAC5-60-200 C.

Statutory Authority

§ 10.1-1308 of the Code of Virginia; §§ 110, 111, 123, 129, 171, 172, and 182 of the Clean Air Act; 40 CFR Parts 51 and 60.

Historical Notes

Derived from VR120-06-0101, eff. April 1, 1988; amended, Virginia Register Volume 12, Issue 3, eff. December 1, 1995; Volume 13, Issue 14, eff. May 1, 1997; Volume 14, Issue 11, eff. April 1, 1998; Volume 15, Issue 13, eff. April 14, 1999; Virginia Register Volume 16, Issue 14, eff. May 1, 2000; Volume 17, Issue 15, eff. June 1, 2001; Volume 18, Issue 7, eff. February 1, 2002; Volume 19, Issue 6, eff. February 1, 2003; Volume 20, Issue 16, eff. June 1, 2004; Volume 21, Issue 7, eff. January 12, 2005; Volume 22, Issue 4, eff. December 1, 2005; Volume 23, Issue 17, eff. June 1, 2007; Volume 24, Issue 5, eff. December 12, 2007; Volume 25, Issue 12, eff. March 18, 2009; Volume 26, Issue 8, eff. January 20, 2010; Volume 27, Issue 11, eff. March 2, 2011; Volume 28, Issue 10, eff. February 15, 2012; Volume 29, Issue 10, eff. February 13, 2013; Volume 30, Issue 10, eff. July 1, 2014; Volume 31, Issue 12, eff. March 11, 2015; Volume 32, Issue 10, eff. February 10, 2016; Volume 33, Issue 10, eff. February 22, 2017; Volume 34, Issue 11, eff. February 21, 2018; Volume 35, Issue 11, eff. February 20, 2019; Volume 36, Issue 12, eff. March 4, 2020; Volume 37, Issue 4, eff. November 11, 2020.

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