Central heating and air conditioning systems have filters to trap dust and other particles (pollution). Portable air cleaners also filter the air in the room where they are located. Entrance airlocks with “walk-off” mats help buildings avoid tracking contaminants. Leave undamaged materials alone and, to the extent possible, prevent them from being damaged, disturbed, or touched. Discard damaged or worn asbestos gloves, stove-top pads, or ironing board covers.

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