Author(s)

T. Castro, L.G. Ruiz-Suarez, M. Helguera, C. Gay & J.C. Ruiz-Suarez

Abstract

Experimental determination of the photolysis constant of nitrogen dioxide for Mexico City T. Castro", L.G. Ruiz-Suarez", M. Helguera C. Gay", J.C. Ruiz-Suarez" ^Centro de Ciencias de la Atmosfera, UNAM, Circuito Exterior de Cd. Univer sit aria, CP 04510 Mezzco, D.F. ^Centra Nacional de Investigacion y Desarrollo Tecnologico, Sep. Av. Palmira s/n, Cuernavaca, Mor., Mexico ^Institute Tecnologico de Estudios Superiores de Monterrey, Campus Morelos, Apartado Postal 00-C, C%er?m?;aca, Mor., Mezzco ABSTRACT The photolytic rate constant of nitrogen dioxide is a key parameter in air quality models. We present the first actual measurements of this rate constant in Mexico City. These were obtained with the use of an actinometer and the reactor, where a known concentration of NO, was photolysed for different experimental exposure times. Under the given experimental conditions, photolysis constants for NO? were determined during the day. This

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