Wis. Admin. Code Department of Natural Resources NR 493.03

Current through October 28, 2024

Section NR 493.03 - Episode levels

(1) AIR EPISODE ADVISORY. The department may issue an Air Pollution Episode advisory to the general public if any air contaminant or combination of air contaminants reaches the respective level of concentration specified in Table 1 at any monitoring site.

(2) AIR EPISODE LEVELS. The department shall declare an Air Pollution Episode Level at the "Alert", "Warning" or "Emergency" stage if any air contaminant or combination of air contaminants reaches the respective level of concentration specified in Table 1 at any monitoring site and if meteorological conditions are such that the concentrations of the air contaminant can be expected to remain at or above that level for 12 or more hours, or in the case of ozone, to recur the following day at the same or a higher level, unless control actions are taken.

Table 1

Episode Stage Criteria For Air Contaminants

Air Contaminants	Sampling	Averaging	Alert	Warning	Emergency
Period	Period
Particulate Matter	24-hours	Block average	375 µg/m3	625 µg/m3	875 µg/m3
Sulfur Dioxide	1-hour	Any hour	1870 µg/m3	3730 µg/m3	4990 µg/m3
(0.70 ppm)	(1.40 ppm)	(1.90 ppm)
24-hours	Continuous running	800 µg/m3	1600 µg/m3	2100 µg/m3
average	(0.30 ppm)	(0.60 ppm)	(0.80 ppm)
Product of Particulate Matter and Sulfur Dioxide	24-hours	Block average	65,000 (µg/m3)2	261,000 (µg/m3)2	393,000 (µg/m3)2
Carbon Monoxide	8-hours	Continuous running average	17 mg/m3 (15 ppm)	34 mg/m3 (30 ppm)	46 mg/m3 (40 ppm)
Ozone (for volatile	1-hour	Any hour	0.20 ppm	0.40 ppm	0.50 ppm
organic compounds)	(400 µg/m3)	(800 µg/m3)	(1000 µg/m3)
Nitrogen Dioxide	1-hour	Any hour	1130 µg/m3	2260 µg/m3	3000 µg/m3
(0.60 ppm)	(1.20 ppm)	(1.60 ppm)

Wis. Admin. Code Department of Natural Resources NR 493.03

Cr. Register, July, 1985, No. 355, eff. 8-1-85; renum. from NR 493.01, Register, September, 1986, No. 369, eff. 10-1-86.