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Automotive fuel cell systems are often called the "Ultimate Zero Emission Powertrain".Their application in passenger cars,buses or trucks offers opportunities to cover use cases in which Battery Electric Vehicles(BEV)reach their limits due to charging needs and driving range requirements in combination with high vehicle weight.To reach the fuel cell systems expected life-time,contaminants from coolants and especially cathode air have to be removed efficiently.Field investigations reveal that gases containing S-or Natoms will poison the fuel cell catalyst.Particles and ions in the cooling liquid will lead to electric shorts and wear,leading to increased degradation rates.The paper describes contamination control solutions for Low Temperature Proton Exchange Membrane(LT PEM)fuel cells.