One of the most important problems in air traffic is the production of air pollutants at and near airports. The estimation can be made today with help of calculation methods and measuring techniques. In most cases, calculations lead to a usable approach, but considering the intensive development of air traffic, measurement technologies are growing in importance. To reduce the high concentration of pollutants in the atmosphere, airports have to consider four sources: fleet operation in-house energy supply ground feeder traffic of motor vehicles catering and supply services for airports. This system measures emissions during flight events (take off, landing and runway operations) from airplanes and from other airport specific sources. This very precise method makes it possible to compare this data with the calculated emissions (LASPORT) of air pollutants in the big area of airports. This combined method is much more accurate, than the single mathematical modelling of emissions and their distribution. This method leads to a much improved accuracy of planning of airports and air traffic near and at airports compared with the current situation.