Super-emitters are vehicles that disproportionally contribute to total fleet emissions (typically 10% of the top polluters contribute to more than 50% of emissions). Super-emitters are not only old vehicles, but also vehicles that are not properly maintained. The SPIDer™ system is a measurement and interpretation system, which enables the identification and interpretation of mobile pollution. It enables taking measurements of black carbon and NOx concentrations on roads, and thus takes direct and real time pollution measurements at its source, i.e., individual vehicles. Besides stationary measurements, mobile readings can be taken by a pursuant vehicle with an attached measuring instrument. The system provides information about vehicles’ emission factors in a real environment, with the option to identify vehicles by taking an optical license plates reading.