Virginia Law

B. Unless otherwise required by context, all terms not defined in this section shall have the meanings provided in Permits for Stationary Sources (9VAC5-80), General Definitions (9VAC5-10), or commonly ascribed to them by recognized authorities, in that order of priority.

C. The following words or terms, when used in the Regulations for the Control and Abatement of Air Pollution and related uses shall have the following meanings.

"Data center" means the same as that term is defined in § 58.1-3506 A 43 of the Code of Virginia.

"Diesel oxidation catalyst" means a flow-through exhaust device that contains a honeycomb structure covered with a layer of chemical catalyst containing small amounts of precious metal such as platinum or palladium that interact with and oxidize pollutants, including carbon monoxide and unburned hydrocarbons, in the exhaust stream, thereby reducing carbon monoxide emissions.

"Diesel particulate filter" means an emission control technology that reduces particulate matter emissions by trapping the particles in a flow filter substrate and periodically removes the collected particles by either physical action or by oxidizing or burning off the particles in a process called regeneration.

"Engine-generator set" or "gen-set" means the combination of an electrical generator and an engine mounted together to form a single piece of equipment.

"Selective catalytic reduction" means a control device that reduces the exhaust gas concentration of nitrogen oxides by injecting an ammonia solution or urea into the exhaust gas stream, which in the presence of a catalyst reacts with the nitrogen oxides to form nitrogen gas and water vapor.

"Tier 4 equivalent" means a gen-set with a selective catalytic reduction system or equivalent for nitrogen oxides control, a diesel oxidation catalyst system or equivalent for carbon monoxide control, and a diesel particulate filter or equivalent for particulate matter control.