Definitions

Definitions. Definitions. The definitions contained in ch. NR 400 apply to the terms used in this chapter. In addition, the following definitions apply to the terms used in this chapter: (1) “Air pollution episode levels” means levels of air quality which are so degraded as to pose imminent danger to public health: (a) “Alert”: The alert level is that concentration of one or more air contaminants at which the first stage control actions begin. (b) “Warning”: The warning level indicates air quality is continuing to degrade and that additional control actions are necessary. (c) “Emergency”: The emergency level indicates that the air quality is continuing to degrade to a level which should never be reached and that the most stringent control actions are necessary.