The Department may not require a permit or registration for:

            (1)      Any machinery or equipment that normally is used in a mobile manner;

            (2)      Any boiler used exclusively to operate steam engines for farm and domestic use;

            (3)      The construction of a generating station constructed by a person that is required to obtain a certificate of public convenience and necessity under §§ 7-207 and 7-208 of the Public Utility Companies Article and regulations adopted by the Public Service Commission;

            (4)      Actual construction of buildings, apart from any possible emission producing machinery housed in the buildings;

            (5)      Any parking garage; or

            (6)      Any parking lot.