Nitrogen oxides

A source of  oxides nitrogen  is burning, mainly at heating and cooking by gas. An oxide is formed nitrous ''' NO which is converted on oxide nitrogenous NO2. In buildings, in which are used gas appliances , achieve concentrations of NO2 are higher concentration than in outdoor environment , including more than 10x.

thumb|right|110px|Nitric oxide thumb|right|300px|Nitrous oxide

 Oxide nitrogenous  NO2 is a gas soluble in tissues. In high concentrations damages pulmonary tissue. Alterations of the lungs functions occurs at concentration of NO2 above 4 mg/m3, in asthmatics  already at 0.2 mg/m3. Children they are much more sensitive, respiratory symptoms appear _ already at concentration of NO2 0.09–0.5 mg/m3. cough, burning and dryness appear mucous membranes , shortness of breath , in more severe cases cases can develop  edema  of the lungs , even with a latency of 72 hours after exposure.