Maryland Environment Section 2-402
§ 2-402.
  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.