The EQB proposes to amend its rule to add a specific threshold number applying to greenhouse gas (GHG) emissions to the mandatory EAW category for air pollutants at part 4410.4300, subpart 15. The level proposed is a combined total of 100,000 tons per year of GHGs, expressed as carbon dioxide equivalents. The gases to which this threshold would apply are carbon dioxide; methane; nitrous oxide; hydrofluorocarbons (HFCs); perfluorocarbons (PFCs); and sulfur hexafluoride. Comments and hearing requests are due by February 23, 2011