what do you understand by photochemical smog?
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Photochemical smog is a mixture of pollutants that are formed when nitrogen oxides and volatile organic compounds (VOCs) react to sunlight, creating a brown haze above cities. It tends to occur more often in summer, because that is when we have the most sunlight.
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When fossil fuels are burned, they release nitrogen oxides into the atmosphere, which contribute to the formation of smog and acid rain. ... Most of the nitrogen oxides released in the U.S. due to human activity are from the burning of fossil fuels associated with transportation and industry.
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Air pollution occurs whenever any harmful gases, dust mites, smoke or smog enters into our atmosphere and makes it difficult for plants, animals, and humans to breathe as the air becomes toxic and contaminated. Primary and Secondary Air Pollutants: Air pollution can be caused by primary sources or secondary sources.
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Photochemical smog is a brownish-gray haze caused by the action of solar ultraviolet radiation on atmosphere polluted with hydrocarbons and oxides of nitrogen. It contains anthropogenic air pollutants, mainly ozone, nitric acid, and organic compounds, which are trapped near the ground by temperature inversion.
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Criteria Pollutants - Air Pollutants of Concern - NH Department of Environmental Services. A colorless gas that is the major constituent of photochemical smog. ... Sources of VOCs and NOX include vehicles, factories, landfills, industrial solvents, and miscellaneous small sources such as gas stations, lawn equipment, etc.
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A Photochemical reaction is a reaction which takes place when a chemical process absorbs light energy as its energy source. The example is photosynthesis.
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This kind of visible air pollution is composed of nitrogen oxides, sulphur oxides, ozone, smoke and other particulates. Man-made smog is derived from coal combustion emissions, vehicular emissions, industrial emissions, forest and agricultural fires and photochemical reactions of these emissions.
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A photochemical reaction is a chemical reaction triggered when light energy is absorbed by a substance's molecules.
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This would effectively reduce the emissions of smog-causing chemicals, and result in clearer, healthier air around urban centers. ... Acid rain is formed when sulfur dioxide and nitrogen oxides react with water vapor and other chemicals in the presence of sunlight to form various acidic compounds in the air.
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Ozone alert follows cancer warning. OZONE, as well as causing breathing difficulties, could give you cancer. Government researchers in the US have uncovered the first serious evidence that the highly reactive gas, which is used in industry and which forms photochemical smogs in summer, might be carcinogenic.
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The major undesirable components of photochemical smog are nitrogen dioxide (NO2), ozone (O3), PAN (peroxyacetylnitrate), and chemical compounds that contain the –CHO group (aldehydes).
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Industrial smog comes from, clearly, industrial processes. It concentrates in urban areas and is formed from sulfur dioxide (mostly from burning coal), water droplets, and other particles such as dust. Photochemical smog is a mixture of all other pollutants, but mostly VOC's and nitrous oxides.
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Health Effects Photochemical smog is capable of inflicting irreversible damage on the lungs and heart. ... It causes painful irritation of the respiratory system, reduced lung function and difficulty breathing; this is more evident while exercising or working outdoors.
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Shanghai's smog is a mixture of pollution from coal, the primary source of energy for most homes and businesses in the region, as well as emissions from vehicles. Smog is air pollution that reduces visibility. The term "smog" was first used in the early 1900s to describe a mix of smoke and fog.
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Definition: Photochemical air pollution is pollution caused by the reaction of unsaturated and saturated hydrocarbons, aromatics and aldehydes (emitted owing to the incomplete combustion of fuels) with light. It causes eye irritation.
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['It has the oxygen that we need to breathe.', "The atmosphere filters the Sun's rays. If there were no atmosphere, the Sun would burn us more."]
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['Ozone (O3)', 'Nitrogen Oxides (NOx)', 'Carbon Monoxide (CO)', 'Sulfur Dioxide (SO2)', 'Particulate Matter (PM10 and PM2.5)']