North Dakota Administrative Code › Title 33.1 - Department of Environmental Quality › Article 33.1-15 - Air Pollution Control › Chapter 33.1-15-11 - Prevention of Air Pollution Emergency Episodes › Table 6 - Air Pollution Episode Criteria

Current through Supplement No. 393, July, 2024
1. Air pollution
				forecast:
An internal watch by the department shall be actuated by a
				  national weather service advisory that an atmospheric stagnation advisory is in
				  effect or the equivalent local forecast of a stagnant atmospheric
				  condition.
2. Air pollution
				alert:
The alert level is that concentration of contaminants at
				  which first stage control actions are to begin. An alert will be declared when
				  any one of the following levels is reached at any monitoring site:
SO2-800 µg/m (0.3 ppm), 24-hour
				  average.
PM10 - 350
				  µg/m3, 24-hour average.
CO-17 mg/m3 (15 ppm), 8-hour
				  average.
Ozone (O3) - 400
				  µg/m3 (0.2 ppm), 1-hour average.
NO2 - 1,130
				  µg/m3 (0.6 ppm), 1-hour average; 282
				  µg/m3 (0.15 ppm), 24-hour average.
In addition to the levels listed for the above pollutants,
				  meteorological conditions are such that pollutant concentrations can be
				  expected to remain at the above levels for twelve or more hours or increase, or
				  in the case of ozone, the situation is likely to recur within the next
				  twenty-four hours unless control actions are taken.
3. Air pollution warning:
The warning level indicates that air quality is continuing
				  to degrade and that additional control actions are necessary. A warning will be
				  declared when any one of the following levels is reached at any monitoring
				  site:
SO2 - 1,600
				  µg/m3 (0.6 ppm), 24 - hour average.
PM10 - 420
				  µg/m3, 24 - hour average.
CO-34 mg/m3 (30 ppm), 8 - hour
				  average.
Ozone (O3) - 800
				  µg/m3 (0.4 ppm), 1 - hour average.
NO2 - 2,260
				  µg/m3 (1.2 ppm), 1 - hour average; 565
				  µg/m3 (0.3 ppm), 24 - hour average.
In addition to the levels listed for the above pollutants,
				  meteorological conditions are such that pollutant concentrations can be
				  expected to remain at the above levels for twelve or more hours or increase, or
				  in the case of ozone, the situation is likely to recur within the next
				  twenty-four hours unless control actions are taken.
4. Air pollution emergency:
The emergency level indicates that air quality is continuing
				  to degrade toward a level of significant harm to the health of persons and that
				  the most stringent control actions are necessary. An emergency will be declared
				  when any one of the following levels is reached at any monitoring site:
SO2 - 2,100
				  µg/m3 (0.8 ppm), 24 - hour average.
PM10 - 500
				  µg/m3, 24 - hour average.
CO-46 mg/m3 (40 ppm), 8 - hour
				  average.
Ozone (O3) - 1,000
				  µg/m3 (0.5 ppm), 1 - hour average.
NO2 - 3,000
				  µg/m3 (1.6 ppm), 1 - hour average; 750
				  µg/m 
				  3 (0.4 ppm), 24 - h our
				  average.
In addition to the levels listed for the above pollutants,
				  meteorological conditions are such that pollutant concentrations can be
				  expected to remain at the above levels for twelve or more hours or increase, or
				  in the case of ozone, the situation is likely to recur within the next
				  twenty-four hours unless control actions are taken.
5. Termination:
Once declared, any status reached by application of these
				  criteria will remain in effect until the criteria for that level are no longer
				  met. At such time, the next lower status will be assumed.