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What is the relation between the indoor and outdoor ultra-fine particle concentration?

April 26, 2017concentration indoor Outdoor particle relation ultra-fine

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What is the relation between the indoor and outdoor ultra-fine particle concentration?

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The ventilation of buildings and the indoor sources determine the relation between indoor and outdoor concentrations. In older, naturally ventilated buildings, ultra-fine particles penetrate very easily. In modern, mechanically ventilated buildings, the quality of the air filters determines the intake of ultra-fine particles. Average filters only have an efficiency of up to 40% for ultra-fine particles. Furthermore, indoor sources like kitchens, smoking rooms, laser printers, copiers should not be neglected.