A large number of the studies have indicated that chemical indoor air pollution has become an important environmental factor which influences the population's health. Nitrogenmonoxide and nitrogen dioxide are mainly produced by combustion at high temperatures and are formed by reactions between nitrogen and oxygen. Both nitrogen in the fuel and nitrogen in the air participate in reaction, NO is further oxidized and transferred into N02 in the atmosphere. Nitrogen dioxide is the most toxic of the nitrogen oxides and is the most important from view-point of health.
Spanish regulations, like those of other countries, lay down various criteria for the permanent ventilation opening which must exist in premises containing gaspowered domestic food cookers. There is growing concern as to the effects of NOx on the health of weaker people such as children old people and those suffering from respiratory ailments, who spend most time at home.
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