Fig. 1
From: Particulate matter exposure shapes DNA methylation through the lifespan
Regional deposition of inhaled particles in the respiratory tract is size-dependent. Heavy dust, coarse, fine, and ultrafine PM are constituted by different contaminants. PM enters the body through the respiratory tree, and particle dimensions influence the level of penetration in the lungs: PM with an aerodynamic diameter below 10 μm penetrates into the bronchi; PM below 2.5 μm reaches the alveoli