In situ analysis laboratory includes an aerosol mass spectrometer, optical and gravimetric particle counters, a particle size spectrometer, a three color integrating nephelometer, 33-gaseous compounds differential optical absorption spectroscopy system and point monitors for O3, SO2, NOx and HC providing real-tir O3, SO2, NOx and HC providing real-time size resolved composition analysis of particulate matter, aerosols scattering coefficients and ambient gases concentrations.