The Norwegian government has put policies in place to reduce air pollution due to road traffic. One such policy instituted a tax on car ownership, for example. They have also tried to remove older, less energy-efficient cars from the streets by increasing refund payments for scrapped cars ("Norway: Environmental Issues").
Air pollution in general has also changed the composition of the air and the earth's atmosphere. One notable change is the global warming, or greenhouse effect, due to an increase of carbon dioxide in the atmosphere. The protective ozone layer in the atmosphere is also disappearing, leaving the earth vulnerable to the damage caused by ultraviolet rays. The air itself now contains more nitrogen oxides, ozone, sulfur dioxide, volatile organic compounds, dust, and metals as well as the carbon dioxide ("What is Air Pollution?").
Air Pollution. Wikipedia. Retrieved on June 18, 2005, from: http://en.wikipedia.org/wiki/Air_pollution
Earth's Atmosphere. Exploration. 1995. Retrieved on June 18, 2005, from: http://liftoff.msfc.nasa.gov/academy/space/atmosphere.html
Lide, D. R. CRC Handbook of Chemistry and Physics. 1997. Retrieved on June 18, 2005, from: http://www.physlink.com/Reference/AirComposition.cfm
Norway: Environmental Issues. Energy Information Administration. Retrieved on June 18, 2005, from: http://www.eia.doe.gov/emeu/cabs/norenv.html
What Is Air Pollution? Retrieved on June 18, 2005, from: http://4hgpmc.com/teachers/product.asp?productid=55
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