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Stratospheric Ozone Depletion tutorial
Increased UV radiation in the lower atmosphere, called the troposphere, can result in increased amounts of photochemical smog. Photochemical smog is already a health hazard in many of the world's largest cities. The decrease of stratospheric ozone was first reported in 1974 and the decrease was quickly linked to the increasing presence of a ...
www.nas.nasa.gov

GAIA Model Base PBM: Photochemical Box Model
Photochemical Box Model DESCRIPTION Its a simple numerical air quality model that simulates photochemical smog at an urban scale. It is best suited to treat low wind conditions, in presence of sun light ... Office of Research and Development Research Triangle Park, NC 27711 REFERENCES "USER'S GUIDE FOR THE PHOTOCHEMICAL BOX MODEL (PBM)", K.L.Shere and K.L. Demerjian Back to models list Copyright 1995 ...
www.ess.co.at

Terms Beginning With "O"
Oxidant: A collective term for some of the primary constituents of photochemical smog. Oxidation Pond: A man-made (anthropogenic) body of water in which waste is consumed by ... 10 miles from the earth's surface), ozone is a chemical oxidant and major component of photochemical smog. It can seriously impair the respiratory system and is one of the most wide- spread ...
epa.gov

Faq
CFCs - they are non-flammable, they do not contribute to photochemical smog (lower atmosphere ozone pollution). With regards to their toxicological evaluation, international programmes tested thoroughly the various HFCs and demonstrated in general their high safety, their low ...
fluorocarbons.org

U.S. Global Change Research Information Office
This combination, when exposed to sunlight, is the classic recipe for photochemical smog, which can at times be deadly in some cities, particularly for residents with respiratory ...
gcrio.org

The problem with paving - How overpaving results in more energy consumption and waste leading to a decline in our quality of life.
According to the U.S. Environmental Protection Agency, six of the seven chief air pollutants come from automobiles. Automobile exhaust damages crops. One study estimated yield losses due to photochemical smog at 1.9 to 4.5 billion dollars per year for four important cash crops in the United States: corn, ...
culturechange.org

Energy Information Administration Voluntary of Greenhouse Gases Program - Glossary of Terms
Earth from harmful ultraviolet radiation. In the troposphere, it is a chemical oxidant, a greenhouse gas, and major component of photochemical smog. Photosynthesis: The manufacture of carbohydrates and oxygen from carbon dioxide and water in the presence of chlorophyll, with sunlight as the energy source. Carbon is sequestered and ...
www.eia.doe.gov

Ozone
Mould Spores Natural Air Pollution Nitrogen Dioxide Outdoor Air Pollution Ozone Particulates Radon Rural Air Quality Smog Smoke Smoking Sulphur Dioxide UK Air Pollution UK Strategy Urban Air Quality Vehicle Emission Controls VOCs ... . Background levels of ozone across Europe are usually less than 15 ppb but can be as high as 60 ppb. During photochemical smog episodes, levels can rise to over 100 ppb. ...
www.enviropedia.org.uk

Smog
Spores Natural Air Pollution Nitrogen Dioxide Outdoor Air Pollution Ozone Particulates Radon Rural Air Quality Smog Smoke Smoking Sulphur Dioxide UK Air Pollution UK Strategy Urban Air Quality Vehicle Emission Controls ... the last 20 years has resulted in a different kind of pollution in urban areas. Photochemical smogs build up during warm sunny days in summer, when air pollutants are trapped at ...
www.enviropedia.org.uk More from this site

Science - Ozone Basics
The dual role of ozone leads to two separate environmental issues. There is concern about increases in ozone in the troposphere. Near-surface ozone is a key component of photochemical "smog," a familiar problem in the atmosphere of many cities around the world. Higher amounts of surface-level ozone are ...
www.ozonelayer.noaa.gov