Minnesota Statutes Environmental Protection (Ch. 114C-116I) § 116.43. Acid deposition defined

As used insections 116.42to116.44, “acid deposition” means the wet or dry deposition from the atmosphere of chemical compounds, usually in the form of rain or snow, having the potential to form an aqueous compound with a pH level lower than the level considered normal under natural conditions, or lower than 5.6.