Russian Federation is the top country by PFC gas emissions in the world. As of 2010, PFC gas emissions in Russian Federation was 20,578 thousand metric tons of CO2 equivalent that accounts for 29.37 % of the world's PFC gas emissions. The top 5 countries (others are China, Japan, the United States of America, and Brazil) account for 68.28 % of it. The world's total PFC gas emissions was estimated at 70,071 thousand metric tons of CO2 equivalent in 2010.
Perfluorocarbons, used as a replacement for chlorofluorocarbons in manufacturing semiconductors, are a byproduct of aluminum smelting and uranium enrichment.