particulate matter

particulate matter: A complex mixture of solid and liquid particles suspended in the air. Tiny solid particles and liquid droplets in the air that can affect health, measured and monitored in Leicestershire. A complex mixture of extremely small solid particles and liquid droplets suspended in the air, often referred to as PM. Tiny solid particles or liquid droplets that remain suspended in the air, which can impact respiratory and cardiovascular health. Tiny particles suspended in the air, originating from sources such as vehicle exhausts, industrial processes, and domestic burning. PM2.5 are particularly fine particles that can penetrate deep into the lungs.