The Clean Air Act and similar state laws and regulations limit the emission of air pollutants from different sources and impose different monitoring and reporting requirements. These laws may require Greylock Production to obtain pre-approval for the construction or modification of projects or facilities that are expected to significantly increase air emissions, as well as to meet stringent air permit or regulatory requirements or use of specific equipment or technologies to control emissions. Obtaining permits may delay the development of Greylock Productiona properties.