Department of Environmental Quality; standby generators study; report. Directs the Department of Environmental Quality to conduct a one-year study of all standby generators used by a commercial facility with an air permit in the Commonwealth. The bill requires the study to (i) identify commercial facilities with an air permit that use standby generators, (ii) identify the type of pollutants emitted from such standby generators, and (iii) analyze and describe the amount of pollutants from such standby generators. The Department is required to report its findings and recommendations to the Chairs of the House Committee on Agriculture, Chesapeake and Natural Resources and the Senate Committee on Agriculture, Conservation and Natural Resources by July 1, 2027.