{"data":{"id":"us/40-cfr-98.65","jurisdiction":"us","citation":"40 CFR 98.65","heading":"Procedures for estimating missing data.","body":"A complete record of all measured parameters used in the GHG emissions calculations is required. Therefore, whenever a quality-assured value of a required parameter is unavailable (e.g., if a meter malfunctions during unit operation or if a required sample measurement is not taken), a substitute data value for the missing parameter shall be used in the calculations, according to the following requirements:\n(a) Where anode or paste consumption data are missing, CO2 emissions can be estimated from aluminum production by using Equation F-9 of this section.\nWhere:\nECO2 = CO2 emissions from anode and/or paste consumption, metric tons CO2.\nEFp = Prebake technology specific emission factor (1.6 metric tons CO2/metric ton aluminum produced).\nMPp = Metal production from prebake process (metric tons Al).\nEFs = Søderberg technology specific emission factor (1.7 metric tons CO2/metric ton Al produced).\nMPs = Metal production from Søderberg process (metric tons Al).\n(b) For other parameters, use the average of the two most recent data points after the missing data.","path":["Title 40—Protection of Environment","CHAPTER I—ENVIRONMENTAL PROTECTION AGENCY","SUBCHAPTER C—AIR PROGRAMS","PART 98—MANDATORY GREENHOUSE GAS REPORTING","Subpart F—Aluminum Production"],"source_url":"https://www.ecfr.gov/api/versioner/v1/full/2026-08-25/title-40.xml","current_through":"2026-08-25","vintage":"","retrieved_at":"2026-08-27T02:26:04Z","sha256":"1283dfe51545ef8b50941c127f4cf1e8346a81091ed71031b0d83230a6dad9fd","source_id":"us-cfr","stale":true,"prev":"us/40-cfr-98.64","next":"us/40-cfr-98.66"},"notice":"GroundRules: Original legal text. Not legal advice."}