Volatile Organic Compounds (VOC)
Every day, large quantities of volatile organic compounds (VOCs) emitted to the atmosphere from both anthropogenic and natural sources. These substances influence local, regional and even global photochemistry and several of them, besides, have a potential impact on the climate, due to their properties of greenhouse gases and as well ability to form aerosol particles on oxidation.
Carbon and oxygen
Tens of thousands of natural compounds detected in the air mixing at various ratios. Volatile Organic Compounds are organic substances primary made up of carbon and hydrogen. However, it may also contain atoms such as sulphur, oxygen, nitrogen, or chlorine. VOCs are volatile in that they evaporate under the climate generally found at Earth’s surface.
The Environmental Protection Agency (EPA)
The Environmental Protection Agency (EPA) in the United States has defined VOC as following. Any compound participates atmospherically create photochemical reactions. Nevertheless, been posterior attempts to give a more precise definition. As a result, VOC is, therefore, all together to be those organic compounds having a vapour pressure greater than ten pa at 25◦C, a boiling point of up to 260◦C at the atmospherical pressure, and 15 or fewer carbon atoms. See Clean air act, Particulate matter(PM) and Criteria pollutants