This bill proposes an amendment to Section 241(5) of the Clean Air Act, specifically targeting the definition of "emergency vehicles" within a covered fleet. The legislation aims to explicitly include dedicated-use vehicles and machinery owned or operated by state, local, or tribal governments as examples of such emergency vehicles. These vehicles must be primarily utilized for the clearance of snow or ice, or the application of anti-icing or de-icing materials, on public roads, rights-of-way, or other public property. By expanding this definition, the bill seeks to ensure that essential snow removal operations are appropriately classified under federal air quality regulations. This amendment could impact compliance requirements for these critical public services during winter weather events.