There are various possible measures to preserve the quality of the air, the first being to avoid polluting with gases or other substances suspended in the atmosphere which can cause nuisances to the health and the environment . In recent years or even decades, strict anti-pollution laws have been implemented in Switzerland, Europe and North America. What begins to be a problem is that air pollution far exceeds reasonable standards in countries like China or India, which in turn become major industrial and commercial powers. It will therefore be necessary to convince these countries to rapidly implement technologies to prevent the situation from getting worse.