Temperatures increase in conjunction with an increase in altitude and can go as high as 1,727Ž Celsius (˘EarthĂs Atmosphere,÷ 1995).
The air can be polluted by primary and secondary pollutants. Primary air pollutants are emitted directly into the air from a particular source. Carbon monoxide, for example, enters the air as a byproduct of combustion. Secondary air pollutants are formed in the atmosphere as a result of chemical reactions involving primary air pollutants, as with ozone formed by photochemical smog (˘Air Pollution÷).
Since Norway is a relatively clean country, producing very little of its own pollution, the best solution for eliminating nitrogen oxides from manufacturing lies in addressing pollution problems in the countries of origin. The United Kingdom (UK) is a