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Table 3 Mean reduction of microorganisms under various conditions of the car's AC system

From: The microbiological quality of air improves when using air conditioning systems in cars

  source of air used in the AC system  
  outside inside variable overall reduction
pathogens 88,6% 81,0% 76,7% 81,7%
particles 89,5% 79,5% 89,3 87,8%