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This paper presents a new, page-oriented model of WWW traffic, based on real HTTP traces taken from corporate and educational environments. It was designed to generate synthetic workload traffic for simulations of wireless systems. Taking into account the characteristics of this kind of simulation, we designed a structural, multilevel model based on the behaviour of WWW users. A three-level structure was created, considering session, page and packet levels. A detailed traffic characterization is presented for both corporate and educational cases in order to fit the model parameters. We also present a detailed comparison between both environments within all the considered time scales. Finally, we report simulations comparing our proposed model empirically with the WWW traffic model proposed by ETSI, and show that the ETSI model underestimates packet losses and delay.