Definitions that relate to particle interaction with the human Man-made outdoor contaminants are many and varied, origi- respiratory system, such as inhalable and respirable nating from numerous types of human activity. The natural contaminant concentrations in the air that we Particle size definitions such as coarse or fine, visible or breathe vary but are usually lower than those caused by human invisible, and macroscopic, microscopic, or submicroscopic activity. These materials can Bioaerosols, including viruses, bacteria, fungal spores, and arise from natural processes such as wind erosion, sea spray evap- pollen, whose primary impact is related to their biological origin oration, volcanic eruption, and metabolism or decay of organic matter. Ashrae handbook of fundamentals pdf | tpvxesrÄusts, fumes, and smokes, which are mostly solid particulate matter, although smoke often contains liquid particles Mists, fogs, and smogs, which are mostly suspended liquid Normal outdoor air contains varying amounts of foreign mate- particles smaller than those in dusts, fumes, and smokes rials permanent atmospheric impurities.
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