The longer the period of the coma, the less the chance for recovery. Most mildly exposed individuals recover with early treatment. Tachycardia and dyspnea may continue for months. There may be CNS disturbances ranging from simple neuritis to mental deterioration. Oxides of Nitrogen a. Physical Properties.
Nitric oxide is colorless.
The other oxides are red-brown gases. This may occur in gun pits, armored vehicles, ship magazines, and turrets. This may also occur in mining and tunneling operations. Inhalation of nitric oxide causes the formation of methemoglobin and does not appear to lead to any tissue lesions. Inhalation of nitrogen dioxide results in the formation of nitrite that leads to a fall in blood pressure and to the production of methemoglobin.