24 C.F.R. § 50.43 Emergencies.
Title 24 - Housing and Urban Development
In cases of national emergency and disasters or cases of imminent threat to health and safety or other emergency which require the taking of an action with significant environmental impact, the provisions of 40 CFR 1506.11 and of any applicable §50.4 authorities which provide for emergencies shall apply.
Title 24: Housing and Urban Development
PART 50—PROTECTION AND ENHANCEMENT OF ENVIRONMENTAL QUALITY
Subpart F—Environmental Impact Statements
§ 50.43 Emergencies.

