VOCs (Volatile Organic Compounds)
VOCs (Volatile Organic Compounds)
Volatile organic compounds (VOCs) are small organic molecules that take part in photochemical reactions in the atmosphere, resulting in smog. They have low boiling points and vaporize easily. When present in the atmosphere, VOCs, such as benzene and ethylbenzene, are not removed by passing the air through a filter. The atmosphere also contains nonvolatile organic compounds and semivolatile species such as anthracene and nicotine. The latter separate partly on a filter and partly in the gas phase, depending on temperature. VOCs (isoprene and pinene) are emitted by living trees and decomposition of vegetation. The process of refining crude oil to various fuels and the use, spillage, and incomplete combustion of those fuels in vehicles is another major source of VOCs. When mixed with nitric oxide emissions, mainly from combustion sources, and allowed to stagnate in intense sunlight, this mix forms ozone (a colorless gas) and oxidizes much of the VOCs to involatile particulate matter that scatters and absorbs light. This combination is termed photochemical smog.
see also Air Pollution; Health, Human; Risk; Smog.
u.s. environmental protection agency. "organic gases (volatile organic compounds—vocs)." available from http://www.epa.gov/iaq.
Environmental destruction as a tool of war is not new. In 146 b.c.e., at the end of the Third Punic War, Roman soldiers reportedly plowed salt into the fields of Carthage, leaving them infertile and ensuring that the North African city would never again be a challenge to the Roman Empire.
"VOCs (Volatile Organic Compounds)." Pollution A to Z. . Encyclopedia.com. (January 19, 2019). https://www.encyclopedia.com/environment/educational-magazines/vocs-volatile-organic-compounds
"VOCs (Volatile Organic Compounds)." Pollution A to Z. . Retrieved January 19, 2019 from Encyclopedia.com: https://www.encyclopedia.com/environment/educational-magazines/vocs-volatile-organic-compounds
Encyclopedia.com gives you the ability to cite reference entries and articles according to common styles from the Modern Language Association (MLA), The Chicago Manual of Style, and the American Psychological Association (APA).
Within the “Cite this article” tool, pick a style to see how all available information looks when formatted according to that style. Then, copy and paste the text into your bibliography or works cited list.
Because each style has its own formatting nuances that evolve over time and not all information is available for every reference entry or article, Encyclopedia.com cannot guarantee each citation it generates. Therefore, it’s best to use Encyclopedia.com citations as a starting point before checking the style against your school or publication’s requirements and the most-recent information available at these sites:
Modern Language Association
The Chicago Manual of Style
American Psychological Association
- Most online reference entries and articles do not have page numbers. Therefore, that information is unavailable for most Encyclopedia.com content. However, the date of retrieval is often important. Refer to each style’s convention regarding the best way to format page numbers and retrieval dates.
- In addition to the MLA, Chicago, and APA styles, your school, university, publication, or institution may have its own requirements for citations. Therefore, be sure to refer to those guidelines when editing your bibliography or works cited list.