Annotation Environmental pollution has received the attention of both economists and ecologists who have integrated their ideas and concepts in recent decades. Production and consumption of material goods generates residuals that are disposed in the environment. Air emissions constitute one of the most important residuals, including greenhouse gases, as well as localized substances toxic to human health and the environment. How economic activity affects gas emissions is valuable information for pollution control and is extremely useful for defining and implementing successful environmental policies, aimed at improving the global efficiency of an economy. The e-book presents the relationship between economic activities and air pollution. It describes research contributions focused on showing the properties and the usefulness of National Accounting Matrices with Environmental Accounts (NAMEA). Additionally, demonstrates the most recent advances in the input-output methodology and linear extended multisectorial models to capture the gas emissions processes with empirical applications of these methods to specific countries. The contents of the e-book make it an interesting platform of new knowledge for both academic public and people in national agencies of environmental regulation.