The Department of the Environment is proposing to amend of Md. Code Regs. 26.11.29 regarding air emissions from natural gas pipeline compression stations. Changes would require stations to meet the hourly limits for nitrogen oxides, and clarify monitoring and record keeping requirements. A public hearing will be held May 19, 2015, and the deadline for comment is also May 19, 2015. See http://www.dsd.state.md.us/mdregister/4208.pdf (pp. 625-626).