The owner/operator of an ice arena must maintain acceptable air quality conditions in the ice rink and in all other areas of the ice arena that are accessible to the public at all times that the ice arena is open to the public. Such conditions are defined as a one-hour average air concentration of not more than thirty (30) parts per million (ppm) of carbon monoxide and a one-hour average air concentration of not more than 0.5 ppm of nitrogen dioxide.
216 R.I. Code R. 216-RICR-50-15-4.4