Section 18 AAC 50.246 - Air quality episodes and advisories tor PM-2.5(a) The department or a local air quality control program may declare an air quality episode and prescribe and publicize the actions to be taken if the concentration of PM-2.5 in the ambient air has reached, or is likely in the immediate future to reach, any of the concentrations established in Table 6a in this subsection. The episode thresholds and actions prescribed for any area that has a local air quality plan included in theState Air Quality Control Plan adopted by reference in 18 AAC 50.030 must be consistent with the emergency episode provisions included in that plan.Table 6Concentrations Triggering an Air Quality Episode for PM-2.5 Episode Type Air Pollutant Concentration in micrograms per cubic meter Air alert PM-2.5 35.5 (24-hour average) Air warning PM-2.5 55.5 (24-hour average) Air emergency PM-2.5 150.5 (24-hour average) (b) The department or a local air quality control program authorized by the department under AS 46.14.400 will declare a PM-2.5 air quality advisory if, in its judgment, PM-2.5 air quality or atmospheric dispersion conditions exist that might threaten public health. (c) If the department or a local air quality control program declares a PM-2.5 air quality advisory under (b) of this section, the department or a local air quality control program will (1) request voluntary emission curtailments from any person issued a permit under this chapter whose stationary source's emissions might impact the area subject to the advisory; and (2) publicize actions to be taken to protect public health. (d) Nothing in this section alters a local government's powers or obligations under a local air quality control program established under AS 46.14.400 and other local laws, as applicable.Eff. 2/28/2015, Register 213, April 2015Authority:AS 44.62.210
AS 44.62.220
AS 44.62.230
AS 46.03.020
AS 46.14.030