RACHEL BROWN WHY is air pollution a concern? Air pollution is a global problem that affects us all, causing harm to our health, vegetation and ecosystems in both urban and rural areas. It occurs when clean air is polluted by particulate matter (PM). This is made up of solid or liquid particles from natural sources such as pollen and desert sand, or from man-made sources, such as dust, soot and smoke. Man-made PM mainly comes from wood-burning stoves, solid-fuel stoves, and open fires in homes; industrial combustion and processes; and road transport. Air pollution also come from gases that have…