Air stagnation advisories are issued by the California Air Resources Board when atmospheric dispersal conditions are poor for an extended period of time (36 hours or more) and buildup of air pollutants is expected. All open burning is prohibited when such an advisory is in effect. If the SMC determines that a local air stagnation advisory is warranted for areas of the YIR, such an advisory will be issued and burning will be prohibited. [Plan § 3.7, adopted, 10/1/2003.]