SIP - ALASKA - 18 AAC 50.245
18 AAC 50.245. AIR EPISODES AND ADVISORIES
(a) The department may declare an air episode and prescribe and publicize curtailment action if the concentration of an air pollutant in the ambient air has reached, or is likely in the immediate future to reach, any of the concentrations established in Table 6 in this subsection.
Table 6. Concentrations Triggering an Air Episode
| Episode Type | Air Pollutant | Concentration in
micrograms per cubic meter
{and in ppm where applicable} |
| Air alert | Sulfur dioxide | 365 (24-hour average)
{0.14 ppm} |
 | PM-10 | 150 (24-hour average) |
| PM-10 from wood burning (wood smoke control areas) | 92 (24-hour average) |
| Carbon monoxide | 10,000 (8-hour average)
{8.7 ppm} |
| Air warning | Sulfur dioxide | 800 (24-hour average)
{0.31 ppm} |
| PM-10 | 350 (24-hour average) |
| Carbon monoxide | 17,000 (8-hour average)
{15 ppm} |
| Air emergency | Sulfur dioxide | 1,600 (24-hour average)
{0.61 ppm} |
| PM-10 | 420 (24-hour average) |
| PM-10 from wood burning (wood smoke control areas) | During an air alert, a concentration measured or predicted to exceed 92 (24-hour average), and to continue to increase beyond the concentration that triggered the air alert |
| Carbon monoxide | 34,000 (8-hour average)
{30 ppm} |
(b) The department will declare an air quality advisory if, in its judgment, air quality or atmospheric dispersion conditions exist that might threaten public health.
(c) If the department declares an air quality advisory under (b) of this section, the department 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.
State effective: 10/1/04; EPA effective: 9/13/07