Emission Master software is designed to compute air emissions generated from both fixed roof and floating roof storage tank activities, allowing for daily, monthly, quarterly, or yearly assessments while also facilitating the evaluation of fugitive emissions. The calculations performed by Emission Master Tanks adhere to the most recent methodologies outlined in EPA Chapter 7.1, as the EPA has ceased support for the EPA Tanks software. The latest version, 8.4.3, which was released on January 17, 2020, introduces new features such as a wider array of tank colors, updated reflective conditions, and enhanced climate data, and now considers tank insulation as a factor influencing working and breathing losses, alongside significant revisions to the vapor space volume calculations for horizontal tanks. Additionally, we have improved the detailed calculation report to assist in spot check validations. Emissions can be assessed for both monthly and yearly intervals, and various factors like climate, fittings, seals, and deck seams can be directly imported into Emission Master from the EPA Tanks 4 databases. Furthermore, users can seamlessly import chemical and mixture data from these EPA Tanks databases for a one-time service fee, making the process more efficient and user-friendly. This comprehensive approach ensures that users have the necessary tools to accurately assess emissions while adhering to current regulatory standards.