1. Air Pollution contamination of the atmosphere

2. Primary Pollutant put directly into the atmosphere by human or natural activity

3. Secondary Pollutants forms in the atmosphere by chemical reaction with primary air pollutants, natural components, or both

4. VOC’s Volatile Organic Compounds chemical compounds that form toxic fumes

5. Smog mixture of smoke and fog produced from industrial pollutants and burning fuels

6. Acid Precipitation precipitation that contains a high concentration of acids

7. pH concentration of hydrogen ions that expresses acidity or alkalinity

8. Ozone Layer layer of the atmosphere that absorbs ultraviolet solar radiation

9. Greenhouse Effect warming of the surface and lower atmosphere of the Earth

10. CFC’s Chlorofluorocarbons hydrocarbons with chlorine and fluorine that destroy ozone molecules in the stratosphere

11. Ozone Hole thinning of stratospheric ozone over the poles

12. Greenhouse Gas gas composed of molecules that absorb and radiate infrared radiation from the sun

13. Global Warming gradual increase in the average global temperature due to higher concentrations of gases

14. Sick-Building Syndrome set of symptoms believed to be caused by indoor pollutants