IPCC Tier 2b Emissions Calculation Methodology Categories Topics Climate Change, Industry & Manufacturing Programs Semiconductor Tipo Information Contact Semiconductor Email semiconductor@arb.ca.gov Phone (279) 208-7884 The Regulation to Reduce Greenhouse Gas Emissions from Semiconductor Operations requires the use of the Intergovernmental Panel on Climate Change (IPCC) Tier 2b emissions calculation methodology to calculate GHG emissions. Related Resources Q4 2022 CITSS Registrants Report Specified Source Registration Workbook February 2023 Joint Auction #34 Notice