Notice of Availability of the Environmental Protection Agency's Updated Ozone Transport Modeling Data for the 2008 Ozone National Ambient Air Quality Standard (NAAQS)

The Environmental Protection Agency (EPA) is providing notice that interstate ozone transport modeling and associated data and methods are available for public review and comment. These data and methods will be used to inform a rulemaking proposal that the EPA is developing and expects to release later this year to address interstate ozone transport for the 2008 ozone national ambient air quality standards (NAAQS). This notice also meets the EPA's expressed intent to update the air quality modeling data that were released on January 22, 2015, and to share the updated data with states and other stakeholders. The information available includes: (1) Emission inventories for 2011 and 2017, supporting data used to develop those emission inventories, methods and data used to process emission inventories into a form that can be used for air quality modeling; and (2) base year 2011 and projected 2017 ozone concentrations and projected 2017 ozone state contribution data at individual ozone monitoring sites based on air quality modeling, supporting data including 2009-2013 base period and 2017 projected ozone design values, and methods used to process air quality model outputs to calculate 2017 ozone concentrations and contributions at individual monitoring sites. A docket has been established to facilitate public review of the data and to track comments.