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Indoor PM2.5 concentration
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== Geographic / System Context == Indoor PM2.5 concentration is not limited to a specific geographic region but is relevant globally wherever human habitation occurs. Variations in indoor PM2.5 levels depend on local outdoor air quality, building design, climate, and occupant activities. Urban areas with higher outdoor pollution may experience elevated indoor PM2.5 due to infiltration, while rural or less polluted regions may have lower indoor concentrations but can still be affected by indoor combustion sources. The phenomenon spans residential, commercial, and institutional indoor environments worldwide.
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