The Department of Natural Resources has proposed amendments to Wis. Admin. Code NR § 400, Air Pollution Control. The proposed rule changes pertain to implementation of existing air permit and emission requirements for sources of hazardous air contaminants from agricultural waste. The primary effort is to establish best management practices that control hazardous air emissions from agricultural waste. http://www.legis.state.wi.us/rsb/code/register/reg650a.pdf pp. 16-17.