Hearings to examine S.2736, to exclude vehicles to be used solely for competition from certain provisions of the Clean Air Act, S.1475, to amend the Clean Air Act to prohibit the issuance of permits under title V of that Act for certain emissions from agricultural production, S.2661, to amend the Clean Air Act to establish a grant program for supporting local communities in detecting, preparing for, communicating about, or mitigating the environmental and public health impacts of wildfire smoke, and S.2421, to authorize the Administrator of the Environmental Protection Agency to conduct research on wildfire smoke.