Va. Code § 10.1-1306
The Department shall make, or cause to be made, such investigations and inspections and do such other things as are reasonably necessary to carry out the provisions of this chapter, within the limits of the appropriations, study grants, funds, or personnel which are available for the purposes of this chapter, including the achievement and maintenance of such levels of air quality as will protect human health, welfare and safety and to the greatest degree practicable prevent injury to plant and animal life and property and which will foster the comfort and convenience of the people of the Commonwealth and their enjoyment of life and property and which will promote the economic and social development of the Commonwealth and facilitate enjoyment of its attractions.
Va. Code § 10.1-1306