Infographic: What is fine particulate matter (PM2.5)?

Fine Particulate Matter (also known as PM2.5) are particles in the air that measure less than 2.5 micrometers (μm) in diameter, and typically consists of a mix of things like smoke, soot, liquid or solid particles in aerosol, or biological matter like mould, bacteria, pollen and animal dander. PM2.5 poses a risk to your health because, when inhaled, it can travel deeply into your lungs.