US lawMinnesotaRegulationsDEPARTMENT OF HEALTHChapter 4620 — CHAPTER 4620, CLEAN INDOOR AIR4620.5000Minn. R. 4620.5000PURPOSELast amended: 2012Year: 2026Length: 26 wordsOfficial source The purpose of parts 4620.5000 to 4620.5900 is to protect public health by ensuring acceptable air quality in the operation and maintenance of indoor motorsports arenas.PreviousMinn. R. 4620.4900NextMinn. R. 4620.5100