Section 594.28 - Environmental reviews(a) For all proposed actions or activities that are not considered categorically excluded under 24 CFR 50.20 , HUD will perform the appropriate environmental reviews under the National Environmental Policy Act (NEPA).(b) Whether the action or activity is categorically excluded from NEPA review or not, HUD will comply also with other applicable requirements of environmental statutes, Executive Orders, and HUD standards listed in 24 CFR 50.4 . The environmental reviews will be performed before award of a grant. Grantees shall adhere to all assurances applicable to environmental concerns as contained in the RFGA and grant agreements.