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Air quality not only matters to the living quality of mankind,but also influences other lives on the earth.Therefore, we should consciously protect the environment, keep improving the air quality and raise the living standard of mankind.With the continuous development of industry and transportation, plenty of harmful substances have been released to the air,which threats residents，health.Therefore, it is especially important to prevent and deal with air pollution and to control the release of pollutants.Plants，especially woods，can filter air pollutants out and purify the air.So afforestation is a comparatively cost-effective measure to prevent and deal with air pollution.
