The Pennsylvania Department of Environmental Protection will publish the final guidance on air quality permitting decisions for oil and gas operations in tomorrow’s Pennsylvania Bulletin

The guidance will apply to emission sources from the exploration, extraction and production of oil and gas and will discuss how the Department decides when to permit sources separately or in the aggregate. The agency published an “interim final” version of the air aggregation guidance for a 30-day public comment period last fall and began implementing it Oct. 21, 2011 which was the subject of two earlier blog posts: