Alaska Department of Environmental Conservation Division of Air Quality

DEC Curtailment and Alerts in the Fairbanks North Star Borough Nonattainment Area

On October 2, 2018, Fairbanks North Star Borough (FNSB) voters passed a citizen initiative (Prop 4) that removed the FNSB’s authority to regulate wood stoves and other wood and coal fired heating devices. Therefore, the Department of Environmental Conservation’s Air Quality Division will be issuing air quality alerts, curtailment announcements, and conducting compliance and enforcement. DEC’s regulations governing its ability to issue curtailments are found in 18 AAC 50 and a description of DEC’s air quality episode plan may be found at State Air Quality Control Plan Vol. II: III.D.7.12 Fairbanks Emergency Episode Plan (PDF).

This web page will be updated regularly with the latest information regarding how curtailments and alerts will be called and how information may be obtained.

Questions & Answers

Advisory/Alert/Waiver information

Advisory – an advisory is called when the 24-hour average PM_2.5 concentration has reached or is expected to reach 15 micrograms per cubic meter and data indicates air quality conditions exist that might threaten public health. Open burning is prohibited in an area where an air quality advisory is in effect and visible emissions may not exceed 20% opacity for more than six minutes. Voluntary curtailment is requested. Learn more about Opacity

Stage 1 – a Stage 1 Alert is called when 24-hour average PM_2.5 concentration has reached or is expected to reach 20 micrograms per cubic meter and data indicates air quality conditions exist that might threaten public health. Open burning is prohibited. Use of solid fuel-fired devices is restricted unless a device has a Stage 1 Waiver, a No Other Adequate Source of Heat (NOASH) waiver, a temporary waiver or there is an approved exception or exemption. Operators need to withhold fuel from non-exempt devices and ensure that combustion, as evidenced by visible smoke from a chimney, has ceased within three hours of the effective time of the Alert announcement.

Stage 2 Alert – a Stage 2 Alert is called when 24-hour average PM_2.5 concentration has reached or is expected to reach 30 micrograms per cubic meter and data indicates air quality conditions exist that might threaten public health. Open burning is prohibited. Use of solid fuel-fired devices is restricted unless a device has a No Other Adequate Source of Heat (NOASH) waiver, a temporary waiver, or there is an approved exception or exemption. Operators need to withhold fuel from non-exempt devices and ensure that combustion, as evidenced by visible smoke from a chimney, has ceased within three hours of the effective time of the Alert announcement.

Waivers

• DEC will issue Stage 1 & NOASH type waivers – Curtailment Waiver and Exception Applications (link)
• Length of waiver will be dependent on:

• • Emission rating
  • Age of device
  • Compliance Status
• Annual renewal may be required.

Alerts/Curtailments Announcements

DEC-issued curtailments must specify the area or zone of the curtailment, any applicable exemptions, and that operators shall withhold fuel from non-exempt devices and ensure that combustion, as evidenced by visible smoke from a chimney, has ceased within three hours of the effective time of the declaration. DEC may either call the Alert or Curtailment for the entire nonattainment area, or for specific zones: North Pole Zone, Fairbanks Zone, or both. Exemptions from a curtailment included in an announcement might include areas experiencing power outages and residents who have temporary waivers. Exceptions to individual episodes may also include exceptions based on the class or type of device or based on a device’s particulate emission rates.

• Alerts and their details will be posted on the Air Quality Alerts Map
• Sign up to Receive Email Notification
• Forecasted curtailments will be issued by 2 p.m. but may have an effective time later in the day
• Curtailment Details

Note: Before declaring a curtailment on the operation of solid fuel-fired heating devices DEC will review the relevant and available meteorological data, weather forecasts, affected area, strength of the inversion, and potential duration of the inversion. It is possible DEC will issue an Alert that does not include a curtailment if weather conditions indicate a clearing prior to any effect of a curtailment could be realized. DEC will endeavor to ensure a curtailment is a reasonable approach given the conditions and available data, with the objective of realizing air pollution reduction benefits from the action.

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