The effect of water in the reaction of NaCl with NO
2 was investigated by diffuse reflectance infrared spectroscopy. The growth of NO
3- absorption showed first order reaction of P(NO
2) for water preadsorbed NaCl while the dry reaction of NaCl-NO
2 was quadratic. The absorption between 1300 and 1500cm
-1 following the process of H
20-evacuation-NO
2-evacuation-H
2O-evacuation-NO
2, demonstrated that, after cease of NO
3- formation, the exposure to humidity reproduced a fresh H
2O adsorbed NaCl surface.
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