Alaska Administrative Code › Title 18 - Environmental Conservation › Chapter 50 - Air Quality Control › Article 2 - Program Administration › 18 AAC 50.245 - Air quality episodes and advisories for air pollutants other than PM-2.5

Current through May 31, 2024
(a) The
				department or a local air quality control program may declare an air quality
				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 Quality Episode for Air Pollutants Other Than PM-2.5
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               92 (24-hour average)
               burning (wood smoke
               control areas)
                                                                              
               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              During an air alert, a
               burning (wood smoke        concentration measured or
               control areas)         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 or a local air quality control program will declare an air quality
				advisory if, in its judgment, air quality or atmospheric dispersion conditions
				exist that might threaten public health.
(c) f the department or a local air quality
				control program declares an 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.