Iowa Admin. Code r. 567-21.1
For the purpose of these rules and the rules in 567-Chapters 20 through 35, the following terms shall, unless otherwise noted, have the meaning indicated in this chapter. Additional definitions potentially applicable to this chapter are set forth in 567-Chapters 22 and 23. The definitions set out in Iowa Code sections 455B.101, 455B.131, and 455B.411 are incorporated verbatim into these rules.
"Air pollution alert" means the action condition declared when the concentrations of air contaminants reach the level at which the first-stage control actions are to begin.
"Air pollution emergency" means the action condition declared when the air quality is continuing to degrade to a level that should never be reached, and that the most stringent control actions are necessary.
"Air pollution episode" means a combination of forecast or actual meteorological conditions and emissions of air contaminants that may or do present an imminent and substantial endangerment to the health of persons, during which the chief meteorological factors are the absence of winds that disperse air contaminants horizontally and a stable atmospheric layer that tends to inhibit vertical mixing through relatively deep layers.
"Air pollution forecast" means an air stagnation advisory issued to the department, the commission, and appropriate air pollution control agencies by an authorized Air Stagnation Advisory Office of the National Weather Service predicting that meteorological conditions conducive to an air pollution episode may be imminent. This advisory may be followed by a prediction of the duration and termination of such meteorological conditions.
"Air pollution warning" means the action condition declared when the air quality is continuing to degrade from the levels classified as an air pollution alert, and where control actions in addition to those conducted under an air pollution alert are necessary.
"Equipment" means equipment capable of emitting air contaminants to produce air pollution.
"Excess emission" means any emission that exceeds any applicable emission standard prescribed in 567-Chapter 23 or 567-22.4 (455B), 567-22.5 (455B), 567-31.3 (455B), or 567-33.3 (455B) or any emission limit specified in a permit or order.
"Existing equipment" means equipment, machines, devices, or installations that were in operation prior to September 23, 1970.
"Malfunction" means any sudden and unavoidable failure of control equipment or of a process to operate in a normal manner. Any failure that is caused entirely or in part by poor maintenance, careless operation, lack of an adequate maintenance program, or any other preventable upset condition or preventable equipment breakdown shall not be considered a malfunction.
"New equipment" means, except for any equipment or modified equipment to which 567-subrule 23.1(2) applies, any equipment or control equipment not under construction or for which components have not been purchased on or before September 23, 1970, and any equipment that is altered or modified after such date, which may cause, eliminate, reduce, or control the emission of air contaminants.
"Opacity" means the degree to which emissions reduce the transmission of light and obscure the view of an object in the background.
"Shutdown" means the cessation of operation of any control equipment or process equipment or process for any purpose.
"Startup" means the setting into operation of any control equipment or process equipment or process for any purpose.
Iowa Admin. Code r. 567-21.1