Particle production in pp collisions at the LHC as studied by CMS

This is a report on the study of hadron production in non-single- diffractive events by using minimum bias and jet triggered data collected with the CMS experiment in the first year of LHC running. The importance of these measure- ments lies in the understanding of the dynamics of multi-hadron production which is described by non-perturbative QCD. The modeling via Monte Carlo generators, and their respective re-tuning, is necessary to describe the underlying event and pile- up, having impact on many measurements that rely on an accurate measurement of hadron jets or missing transverse energy. I present an overview of the inclusive single particle spectra, the yields of strange hadrons and the charged hadron multiplicity distributions measured at several center-of-mass energies that show a fast growth of particle densities at the highest energies, especially for low transverse momenta, and a strong violation of KNO scaling in large pseudorapidity intervals.