Smog (a combination of the words smoke and fog) forms when sunlight acts on a cocktail of pollutant gases such as nitrogen and sulfur oxides, unburned hydrocarbons, and carbon monoxide that's why it's sometimes called photochemical smog (the energy in light causes the chemical reaction that makes smog) one of the most harmful constituents. Photochemical smog (or just smog for short) is a term used to describe air pollution that is a result of the interaction of sunlight with certain chemicals in the atmosphere one of the primary components of photochemical smog is ozone. 4 photochemical smog, caused when sunlight radiations react with nitrogen oxides, is proven to damage plant life and irritate sensitive membranes of both people and animals 5 reduction in the us, the clean air act of 1967 as amended in 1970, 1977, and 1990 is the legal basis for air-pollution control throughout the us. Suggest how photochemical smog is likely to change in the decades to come knowledge and understanding u 631 primary pollutants from the combustion of fossil fuels include carbon monoxide, carbon dioxide, black carbon or soot, unburned hydrocarbons, oxides of nitrogen, and oxides of sulfur.
Smog became a serious problem in los angeles after world war ii on christmas eve, 1948, traffic was clear unfortunately, the air wasn't - courtesy of university of southern california, on. Photochemical smog is composed of primary and secondary pollutants primary pollutants, which include nitrogen oxides and volatile organic compounds, are introduced into the atmosphere via vehicular emissions and industrial processes. What is most likely to have caused the rapid increase in photochemical smog between 8 am and 11 am reactions of nitrous oxides (nox) and vocs with oxygen in sunlight what is most likely to have caused the levels of ozone and photochemical smog to decline after 4:00 pm. Modern smog, as found for example in los angeles, is a type of air pollution derived from vehicular emission from internal combustion engines and industrial fumes that react in the atmosphere with sunlight to form secondary pollutants that also combine with the primary emissions to form photochemical smog.
What is smog smog is basically derived from the merging of two words smoke and fog smog is also used to describe the type of fog which has smoke or soot in it smog is a yellowish or blackish fog formed mainly by a mixture of pollutants in the atmosphere which consists of fine particles and ground level ozone. Photochemical smog is a type of air pollution produced when sunlight acts upon motor vehicle exhaust gases to form harmful substances such as ozone (o 3), aldehydes and peroxyacetylnitrate (pan) photochemical smog formation requires the following conditions. The powerpoint ppt presentation: introduction to photochemical smog chemistry is the property of its rightful owner do you have powerpoint slides to share if so, share your ppt presentation slides online with powershowcom. The first is intended to provide a brief survey of the problem of photochemical smog in los angeles as presently understood in relation to the available field data and also in relation to chamber experiments which have been run in various laboratories. Photochemical smog, including ozone accumulation, in the lower troposphere that is, ozone depletion in the upper atmosphere will allow more ultraviolet radi- ation to reach the troposphere where photochemical smog forms via a uvr.
During the great smog of 1952, coal pollution blanketed the city of london, england more than 4,000 people died from respiratory ailments as a result the smog was so thick that the city had to shut down roads, railways, and the airport robbers used the cover of smog to break into houses and shops. Photochemical smog reactions smog is a term originally formed by the combination of of the words smoke and fog this can seem a little confusing, because los angeles, infamous for for its smog, is hardly known for foggy weather. Introduction to photochemical smog chemistry - powerpoint ppt presentation the presentation will start after a short (15 second) video ad from one of our sponsors. Smog is a complex mixture of primary and secondary pollutants, of which tropospheric ozone is the main pollutant the frequency and severity of smog in an area depends on local topography, climate, population density, and fossil fuel use.
There are two types of smog: photochemical smog and industrial smog photochemical smog occurs when strong sunlight reacts with air pollution such as the hydrocarbons and nitrogen oxides released from vehicles and power plants. Photochemical smog essays: over 180,000 photochemical smog essays, photochemical smog term papers, photochemical smog research paper, book reports 184 990 essays, term and research papers available for unlimited access. The word thus coined is a contraction of smoke fog smog -- and its introduction was received with applause as being eminently expressive and appropriate it is not exactly a pretty word, but it fits very well the thing it represents, and it has only to become known to be popular. What is smog top of page ^ smog is a type of air pollution the physical and chemical composition of smog is complex and variable what all smogs have in common is that they are visible as a low-hanging cloud, often brownish or yellowish in colour and occurring usually over an urban area.
Smog is a type of air pollution, which is a mixture of smoke and fog in the air (smoke + fog = smog) smog is formed when ash, sulphur and other harmful chemicals present in the smoke emitted by factories, vehicles, zoom farming, burning of coal and industrial plants, are exposed to the fog. Ground level ozone and photochemical smog print ozone is a secondary pollutant that forms from the primary pollutants such as volatile organic compounds (hydrocarbons) and nitrogen oxides (no x ) in the presence of sunlight. Smog essay examples the industrial revolution in relation photochemical smog 1,705 words the importance of the issue of smog and its causes and effects. Photochemical smog is a mixture of many organic and inorganic gas phase molecules it contains ozone, nitrogen oxides, and organic molecules typically, we estimate the amount of smog by measuring the concentration of one component, ozone.
Despite these early attempts to bring attention to the effects of transport emissions on air quality, the world waited until 1975 when the us introduced regulations forcing the introduction of catalytic converters onto gasoline vehicles in an attempt to improve air quality and limit the formation of photochemical smog. The los angeles smog is an oxidizing smog formed from the photochemical reactions of nitrogen oxides and volatile organic hydrocarbons, which are primary pollutants released from the combustion of fossil fuels in automobiles, power plants, etc. In the united states, photochemical smog is commonly referred to simply as smog it is different from the pea-soup smog of london, which is a combination of sulfurous smoke and fog photochemical smog is a layer of air pollution near earth's surface.