Alveolar macrophage
![Micrograph showing hemosiderin-laden alveolar marcophages, as seen in a pulmonary haemorrhage. H&E stain.](/Images/godic/202501/10/Pulmonary_haemorrhage_-_very_high_mag5456.jpg")
![Micrograph of carbon-laden macrophages in the lung, H&E stain](/Images/godic/202501/10/Carbon_laden_macrophages_in_lung,_H&E_100X5456.jpg")
An alveolar macrophage (or dust cell) is a type of macrophage found in the pulmonary alveolus, near the pneumocytes, but separated from the wall.
Activity of the alveolar macrophage is relatively high, because they are located at one of the major boundaries between the body and the outside world.