C. Air Preservation

¢Fresh air is needed for keeping health. Fresh air can be obtained from places having many plants. Therefore, afforestation and reforestation are very useful to preserve air. Bad quality air can be avoided by avoiding air pollution. Preventing pollution can be performed by various way, for example.¢1) Localizing industrial area distant from dwellings.¢2) Obligating all factories to have air filter tools.¢3) Using green fuel like gas.