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Natural gas is a nonrenewable fossil fuel that is composed of several different gases, with methane making up the biggest portion. Formed millions of years ago from decaying animals and plants that heat and pressure built into thick layers, natural gas is found in sedimentary basins throughout the world. It contains no poisonous... more »
Hyperventilation is when a person is breathing or gasping far too fast to get the oxygen they need. Hyperventilation is one of the signs of an asthma attack. You don't have to have asthma in order to hyperventilate, but asthma sufferers have trouble breathing and are more prone to getting hyperventilation. more »
Coughing is an important function of your body that helps remove irritants from your throat and lungs. However, a persistent cough can be an irritating distraction. There are a number of home remedies to help eliminate a cough. If you have ruled out the possibility that your cough is caused by a more serious problem, it is not a... more »
Air pollution refers to the presence of chemicals and natural substances in the air which cause a significant alteration of the air's property, especially when it relates to its breathability. While environmental pollution can happen anywhere, air pollution is mainly a problem of urban areas, especially large cities in heavily... more »
Asthma is a chronic respiratory disease that affects millions of Americans, many of them children. The symptoms of asthma--lack of breath, wheezing or coughing--are caused by the constriction of the muscles in bronchial airways by an autoimmune response to stressors called "triggers." Untreated asthma can lead to inflammation,... more »
Knowing your nutritional ABCs is important for your overall health. Eat with nutrition in mind,...
Smog alerts are used by local governments to warn people when it's unsafe to be outdoors. Excessive smog alert days can result in higher gasoline... more »
More than 30 states require emissions or smog testing in their major cities. In an effort to reduce pollution, these tests are completed either on... more »
According to Inkguides.com, recycled ink cartridges are made from reworked waste or old printer cartridge parts. Recycled ink cartridges account... more »
Polio, short for poliomyelitis, was once a devastating illness that affected millions. Nowadays it isn't as prevalent but does still exist.... more »
California boasts more cars than practically anywhere else in the world, so it's no wonder that many online car dealerships originate in the... more »
Smog is a kind of air pollution; the word "smog" is a portmanteau of smoke and fog. Classic smog results from large amounts of coal burning in an area caused by a mixture of smoke and sulfur dioxide. Modern smog does not usually come from coal but from vehicular and industrial emissions that are acted on in the atmosphere by sunlight to form secondary pollutants that also combine with the primary emissions to form photochemical smog.
Origin of term
Coinage of the term "smog" is generally attributed to Dr. Henry Antoine Des Voeux in his 1905 paper, "Fog and Smoke," for a meeting of the Public Health Congress. The July 26, 1905 edition of the London newspaper Daily Graphic quoted Des Voeux, "He said it required no science to see that there was something produced in great cities which was not found in the country, and that was smoky fog, or what was known as smog." The following day the newspaper stated that "Dr. Des Voeux did a public service in coining a new word for the London fog." "Smog" also appears in a January 19, 1893, Los Angeles Times article and is attributed to "a witty English writer."
Photochemical smog
In the 1950s a new type of smog, known as photochemical smog, was first described. This forms when sunlight hits various pollutants in the air and forms a mix of inimical chemicals that can be very dangerous. A photochemical smog is the chemical reaction of sunlight, nitrogen oxides (NOx) and volatile organic compounds (VOCs) in the atmosphere, which leaves airborne particles (called particulate matter) and ground-level ozone.
Nitrogen oxides are released by nitrogen and oxygen in the air reacting together under high temperature such as in the exhaust of fossil fuel-burning engines in cars, trucks, coal power plants, and industrial manufacturing factories. VOCs are released from man-made sources such as gasoline (petrol), paints, solvents, pesticides, and biogenic sources, such as pine and citrus tree emissions.
read more at » http://en.wikipedia.org/wiki/Smog
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