Me. Rev. Stat. tit. 22, § 1581

The purpose of this chapter is to protect the public health; to regulate and license the suppliers of compressed air used in self-contained breathing apparatus; to set up rules and regulations to establish the maximum permissible amount of all contaminants expressed either in percentages or in parts per million of volume, or both; to set up standards for the condition of the compression equipment; and to prescribe penalties for violations of this chapter.