D.C. Code § 8-101.04
Air quality control regulations: D.C. Law 5-165, § 3, the "District of Columbia Air Pollution Control Act of 1984", enacted the air quality control regulations of the District of Columbia as Title 20 of the District of Columbia Municipal Regulations (20 DCMR Chapters 1-9).
Mar. 15, 1985, D.C. Law 5-165, § 4, 32 DCR 562.
.