Current environmental and quality control monitoring studies of air, water and soil pollution produce large data tables. Under the assumption that the measured concentrations or parameters are the result of a mixture of independent unknown sources, the application of chemometric mixture analysis approaches such as multivariate resolution methods allow for the identification and apportionment of these sources. We have been working mostly in surface water and air pollution type of quality assessment problems with data from different monitoring programs and campaigns in our geographical area, and from other countries. These studies provide the description of the main contamination sources affecting a particular environmental compartment (air, water, soil, biota,…), geographical area and over time. Composition and geographical and temporal distribution profiles of these contamination sources allow for a better assessment of the current environmental situation and risk in the investigated regions and over time.