Figure 1 (IMAGE) Queen Mary University of London Caption Fig. 1. Light microscopy images: (A) macrophage-enriched placental cell isolates from different participants, showing black inclusions (red arrows) compatible with phagocytosed inhaled particulate matter; (B) phagocytosed particulate matter in an airway macrophage obtained by sputum induction from a healthy child in London (Liuetal.,2018). Cell nuclei indicated with white arrows. Brightness and contrast of images were adjusted for optimal visualisation of particulate matter. Credit QMUL Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.