H.R. 1066 would eliminate Section 138 of the Clean Air Act, which establishes environmental and climate justice block grants. These grants provide federal funding to communities disproportionately affected by pollution and environmental hazards. The bill would repeal this grant program entirely and redirect any unspent grant money back to the federal government rather than allowing it to be distributed to eligible communities. The legislation would affect low-income and minority neighborhoods that currently benefit from these federal environmental improvement projects. No new funding is involved since the bill removes an existing program rather than authorizing new spending.